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国密SM4-OpenSSL-EVP接口例子.html
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<h3 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h3><p>SM4算法是一个分组加密算法。该算法的分组长度为128比特，密钥长度为128比特。加密算法与密钥扩展算法都采用32轮非线性迭代结构。其密文长度等于明文长度。</p>
<h3 id="加密一段数据"><a href="#加密一段数据" class="headerlink" title="加密一段数据"></a>加密一段数据</h3><p>EVP提供的接口可以在一个函数中根据不同的参数来执行加密或加密计算。其主要接口：</p>
<pre class="line-numbers language-c" data-language="c"><code class="language-c"><span class="token keyword">int</span> <span class="token function">EVP_CipherInit_ex</span><span class="token punctuation">(</span>EVP_CIPHER_CTX <span class="token operator">*</span>ctx<span class="token punctuation">,</span> <span class="token keyword">const</span> EVP_CIPHER <span class="token operator">*</span>cipher<span class="token punctuation">,</span> ENGINE <span class="token operator">*</span>impl<span class="token punctuation">,</span>
<span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>key<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>iv<span class="token punctuation">,</span> <span class="token keyword">int</span> enc<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">EVP_Cipher</span><span class="token punctuation">(</span>EVP_CIPHER_CTX <span class="token operator">*</span>c<span class="token punctuation">,</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>out<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>in<span class="token punctuation">,</span>
<span class="token keyword">unsigned</span> <span class="token keyword">int</span> inl<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
<p>一个简单的例子：</p>
<pre class="line-numbers language-c" data-language="c"><code class="language-c"><span class="token comment">// sm4_str.c</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><errno.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><openssl/evp.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdio.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><string.h></span></span>
<span class="token comment">/**
* @brief 加密或解密数据
*
* @param in 输入数据
* @param inl 输入数据的长度
* @param out 输出数据
* @param do_encrypt 1-加密，0-解密
* @return void
*/</span>
<span class="token keyword">void</span> <span class="token function">do_crypt</span><span class="token punctuation">(</span><span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span><span class="token operator">*</span> in<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">int</span> inlen<span class="token punctuation">,</span>
<span class="token keyword">unsigned</span> <span class="token keyword">char</span><span class="token operator">*</span> out<span class="token punctuation">,</span> <span class="token keyword">int</span> do_encrypt<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span><span class="token operator">*</span> key<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
EVP_CIPHER_CTX<span class="token operator">*</span> ctx <span class="token operator">=</span> <span class="token function">EVP_CIPHER_CTX_new</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">EVP_CipherInit_ex</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token function">EVP_sm4_cbc</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">,</span> key<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">,</span> do_encrypt<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">EVP_Cipher</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> out<span class="token punctuation">,</span> in<span class="token punctuation">,</span> inlen<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">EVP_CIPHER_CTX_free</span><span class="token punctuation">(</span>ctx<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token keyword">int</span> argc<span class="token punctuation">,</span> <span class="token keyword">char</span> <span class="token keyword">const</span><span class="token operator">*</span> argv<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">unsigned</span> <span class="token keyword">char</span> key<span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">6</span><span class="token punctuation">,</span> <span class="token number">7</span><span class="token punctuation">,</span>
<span class="token number">8</span><span class="token punctuation">,</span> <span class="token number">9</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">11</span><span class="token punctuation">,</span> <span class="token number">12</span><span class="token punctuation">,</span> <span class="token number">13</span><span class="token punctuation">,</span> <span class="token number">14</span><span class="token punctuation">,</span> <span class="token number">15</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> <span class="token keyword">char</span><span class="token operator">*</span> str <span class="token operator">=</span> <span class="token string">"hello world"</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"origin data= %s\n"</span><span class="token punctuation">,</span> str<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// encrypt</span>
<span class="token keyword">unsigned</span> <span class="token keyword">char</span> buf<span class="token punctuation">[</span>BUFSIZ<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token number">0</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token function">do_crypt</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span><span class="token operator">*</span><span class="token punctuation">)</span>str<span class="token punctuation">,</span> <span class="token function">strlen</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span><span class="token punctuation">,</span> buf<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> key<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"after encrypt str(hex)= "</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> <span class="token number">12</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"%2X"</span><span class="token punctuation">,</span> buf<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// decrypt</span>
<span class="token keyword">unsigned</span> <span class="token keyword">char</span> bufout<span class="token punctuation">[</span>BUFSIZ<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token number">0</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token function">do_crypt</span><span class="token punctuation">(</span>buf<span class="token punctuation">,</span> <span class="token function">strlen</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token keyword">const</span> <span class="token keyword">char</span><span class="token operator">*</span><span class="token punctuation">)</span>buf<span class="token punctuation">)</span><span class="token punctuation">,</span> bufout<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> key<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"\nafter decrypt data= %s\n"</span><span class="token punctuation">,</span> bufout<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>编译执行：</p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash">$ gcc -g -Wall sm4_str.c -lcrypto -std<span class="token operator">=</span>c11 -o sm4_str
$ ./sm4_str
origin <span class="token assign-left variable">data</span><span class="token operator">=</span> hello world
after encrypt str<span class="token punctuation">(</span>hex<span class="token punctuation">)</span><span class="token operator">=</span> 8CA754D2A26F6FC638C1953F
after decrypt <span class="token assign-left variable">data</span><span class="token operator">=</span> hello world<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="对大数据进行加密1"><a href="#对大数据进行加密1" class="headerlink" title="对大数据进行加密1"></a>对大数据进行加密1</h3><p>OpenSSL还提供了一组接口用于对不能一次性完成加密的大数据进行加密。</p>
<pre class="line-numbers language-c" data-language="c"><code class="language-c"><span class="token keyword">int</span> <span class="token function">EVP_CipherInit_ex</span><span class="token punctuation">(</span>EVP_CIPHER_CTX <span class="token operator">*</span>ctx<span class="token punctuation">,</span> <span class="token keyword">const</span> EVP_CIPHER <span class="token operator">*</span>cipher<span class="token punctuation">,</span> ENGINE <span class="token operator">*</span>impl<span class="token punctuation">,</span>
<span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>key<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>iv<span class="token punctuation">,</span> <span class="token keyword">int</span> enc<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">EVP_CipherUpdate</span><span class="token punctuation">(</span>EVP_CIPHER_CTX <span class="token operator">*</span>ctx<span class="token punctuation">,</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>out<span class="token punctuation">,</span> <span class="token keyword">int</span> <span class="token operator">*</span>outl<span class="token punctuation">,</span>
<span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>in<span class="token punctuation">,</span> <span class="token keyword">int</span> inl<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">EVP_CipherFinal_ex</span><span class="token punctuation">(</span>EVP_CIPHER_CTX <span class="token operator">*</span>ctx<span class="token punctuation">,</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>outm<span class="token punctuation">,</span> <span class="token keyword">int</span> <span class="token operator">*</span>outl<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>一个简单的例子：</p>
<pre class="line-numbers language-c" data-language="c"><code class="language-c"><span class="token comment">// sm4_file.c</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><openssl/evp.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdio.h></span></span>
<span class="token keyword">static</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> key<span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">6</span><span class="token punctuation">,</span> <span class="token number">7</span><span class="token punctuation">,</span>
<span class="token number">8</span><span class="token punctuation">,</span> <span class="token number">9</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">11</span><span class="token punctuation">,</span> <span class="token number">12</span><span class="token punctuation">,</span> <span class="token number">13</span><span class="token punctuation">,</span> <span class="token number">14</span><span class="token punctuation">,</span> <span class="token number">15</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">/**
* @brief 加密或解密文件中的数据
*
* @param in 输入文件
* @param out 输出文件
* @param do_encrypt 1-加密，0-解密
* @return int 成功返回0，否则返回-1
*/</span>
<span class="token keyword">int</span> <span class="token function">do_crypt</span><span class="token punctuation">(</span>FILE<span class="token operator">*</span> in<span class="token punctuation">,</span> FILE<span class="token operator">*</span> out<span class="token punctuation">,</span> <span class="token keyword">int</span> do_encrypt<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">unsigned</span> <span class="token keyword">char</span> inbuf<span class="token punctuation">[</span>BUFSIZ<span class="token punctuation">]</span><span class="token punctuation">,</span> outbuf<span class="token punctuation">[</span>BUFSIZ <span class="token operator">+</span> EVP_MAX_BLOCK_LENGTH<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> outlen<span class="token punctuation">;</span>
<span class="token class-name">size_t</span> inlen<span class="token punctuation">;</span>
EVP_CIPHER_CTX<span class="token operator">*</span> ctx <span class="token operator">=</span> <span class="token function">EVP_CIPHER_CTX_new</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 指定SM4初始化ctx</span>
<span class="token function">EVP_CipherInit_ex</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token function">EVP_sm4_cbc</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">,</span> key<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">,</span> do_encrypt<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>inlen <span class="token operator">=</span> <span class="token function">fread</span><span class="token punctuation">(</span>inbuf<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> BUFSIZ<span class="token punctuation">,</span> in<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">EVP_CipherUpdate</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> outbuf<span class="token punctuation">,</span> <span class="token operator">&</span>outlen<span class="token punctuation">,</span> inbuf<span class="token punctuation">,</span> inlen<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">EVP_CIPHER_CTX_free</span><span class="token punctuation">(</span>ctx<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token keyword">return</span> <span class="token number">1</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">fwrite</span><span class="token punctuation">(</span>outbuf<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> outlen<span class="token punctuation">,</span> out<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">EVP_CipherFinal_ex</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> outbuf<span class="token punctuation">,</span> <span class="token operator">&</span>outlen<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">EVP_CIPHER_CTX_free</span><span class="token punctuation">(</span>ctx<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token keyword">return</span> <span class="token number">1</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">fwrite</span><span class="token punctuation">(</span>outbuf<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> outlen<span class="token punctuation">,</span> out<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">EVP_CIPHER_CTX_free</span><span class="token punctuation">(</span>ctx<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token keyword">int</span> argc<span class="token punctuation">,</span> <span class="token keyword">char</span> <span class="token keyword">const</span><span class="token operator">*</span> argv<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>argc <span class="token operator">!=</span> <span class="token number">2</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"usage: %s <filename>\n"</span><span class="token punctuation">,</span> argv<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">1</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">char</span><span class="token operator">*</span> encry_file_neme <span class="token operator">=</span> <span class="token string">"/tmp/encry_file"</span><span class="token punctuation">;</span>
<span class="token keyword">char</span><span class="token operator">*</span> decry_file_name <span class="token operator">=</span> <span class="token string">"/tmp/decry_file"</span><span class="token punctuation">;</span>
FILE<span class="token operator">*</span> orig_file <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span>argv<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token string">"r"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
FILE<span class="token operator">*</span> encry_file <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span>encry_file_neme<span class="token punctuation">,</span> <span class="token string">"w"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// encrypt</span>
<span class="token function">do_crypt</span><span class="token punctuation">(</span>orig_file<span class="token punctuation">,</span> encry_file<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span>orig_file<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span>encry_file<span class="token punctuation">)</span><span class="token punctuation">;</span>
encry_file <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span>encry_file_neme<span class="token punctuation">,</span> <span class="token string">"r"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
FILE<span class="token operator">*</span> decry_file <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span>decry_file_name<span class="token punctuation">,</span> <span class="token string">"w"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// decrypt</span>
<span class="token function">do_crypt</span><span class="token punctuation">(</span>encry_file<span class="token punctuation">,</span> decry_file<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span>encry_file<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span>decry_file<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"sm4 do_encry finish. see encrypt file:%s and decrypt file:%s.\n"</span><span class="token punctuation">,</span>
encry_file_neme<span class="token punctuation">,</span> decry_file_name<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>编译执行：</p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash">$ ./sm4_file sm4_file.c
sm4 do_encry finish. see encrypt file:/tmp/encry_file and decrypt file:/tmp/decry_file.<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>
<p>然后就可以在<code>/tmp/encry_file</code>和<code>/tmp/decry_file</code>查看加密的文件和解密后的文件。</p>
<h3 id="对大数据进行加密2"><a href="#对大数据进行加密2" class="headerlink" title="对大数据进行加密2"></a>对大数据进行加密2</h3><p>OpenSSL还提供了另一组接口，将加密和解密运算分开。</p>
<pre class="line-numbers language-c" data-language="c"><code class="language-c"><span class="token keyword">int</span> <span class="token function">EVP_EncryptInit_ex</span><span class="token punctuation">(</span>EVP_CIPHER_CTX <span class="token operator">*</span>ctx<span class="token punctuation">,</span> <span class="token keyword">const</span> EVP_CIPHER <span class="token operator">*</span>cipher<span class="token punctuation">,</span> ENGINE <span class="token operator">*</span>impl<span class="token punctuation">,</span>
<span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>key<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>iv<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">EVP_EncryptUpdate</span><span class="token punctuation">(</span>EVP_CIPHER_CTX <span class="token operator">*</span>ctx<span class="token punctuation">,</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>out<span class="token punctuation">,</span><span class="token keyword">int</span> <span class="token operator">*</span>outl<span class="token punctuation">,</span>
<span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>in<span class="token punctuation">,</span> <span class="token keyword">int</span> inl<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">EVP_EncryptFinal_ex</span><span class="token punctuation">(</span>EVP_CIPHER_CTX <span class="token operator">*</span>ctx<span class="token punctuation">,</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>out<span class="token punctuation">,</span> <span class="token keyword">int</span> <span class="token operator">*</span>outl<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">EVP_DecryptInit_ex</span><span class="token punctuation">(</span>EVP_CIPHER_CTX <span class="token operator">*</span>ctx<span class="token punctuation">,</span> <span class="token keyword">const</span> EVP_CIPHER <span class="token operator">*</span>cipher<span class="token punctuation">,</span> ENGINE <span class="token operator">*</span>impl<span class="token punctuation">,</span>
<span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>key<span class="token punctuation">,</span> <span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>iv<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">EVP_DecryptUpdate</span><span class="token punctuation">(</span>EVP_CIPHER_CTX <span class="token operator">*</span>ctx<span class="token punctuation">,</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>out<span class="token punctuation">,</span> <span class="token keyword">int</span> <span class="token operator">*</span>outl<span class="token punctuation">,</span>
<span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>in<span class="token punctuation">,</span> <span class="token keyword">int</span> inl<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> <span class="token function">EVP_DecryptFinal_ex</span><span class="token punctuation">(</span>EVP_CIPHER_CTX <span class="token operator">*</span>ctx<span class="token punctuation">,</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span> <span class="token operator">*</span>outm<span class="token punctuation">,</span> <span class="token keyword">int</span> <span class="token operator">*</span>outl<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>一个简单的例子：</p>
<pre class="line-numbers language-c" data-language="c"><code class="language-c"><span class="token comment">// sm4_file1.c</span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><errno.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><openssl/evp.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><stdio.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">include</span> <span class="token string"><string.h></span></span>
<span class="token macro property"><span class="token directive-hash">#</span><span class="token directive keyword">define</span> <span class="token macro-name">BUFSIZE</span> <span class="token expression"><span class="token number">20</span></span></span>
<span class="token comment">/**
* @brief 对文件内容进行加密
*
* @param fp 要对里面的内容进行加密的文件指针
* @param out 加密后的数据输出
* @param outlen 加密后的数据长度
* @param key 秘钥,可以为NULL
* @return int 函数返回值
*/</span>
<span class="token keyword">int</span> <span class="token function">do_encrypt</span><span class="token punctuation">(</span>FILE<span class="token operator">*</span> fp<span class="token punctuation">,</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span><span class="token operator">*</span> out<span class="token punctuation">,</span> <span class="token keyword">int</span><span class="token operator">*</span> outlen<span class="token punctuation">,</span>
<span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span><span class="token operator">*</span> key<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">int</span> tmplen <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
EVP_CIPHER_CTX<span class="token operator">*</span> ctx <span class="token operator">=</span> <span class="token function">EVP_CIPHER_CTX_new</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">EVP_EncryptInit_ex</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token function">EVP_sm4_ecb</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">,</span> key<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">unsigned</span> <span class="token keyword">char</span> buf<span class="token punctuation">[</span>BUFSIZE<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token number">0</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token class-name">size_t</span> nread <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>nread <span class="token operator">=</span> <span class="token function">fread</span><span class="token punctuation">(</span>buf<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> BUFSIZE<span class="token punctuation">,</span> fp<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">EVP_EncryptUpdate</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> out <span class="token operator">+</span> tmplen<span class="token punctuation">,</span> outlen<span class="token punctuation">,</span> buf<span class="token punctuation">,</span> nread<span class="token punctuation">)</span><span class="token punctuation">;</span>
tmplen <span class="token operator">+=</span> <span class="token punctuation">(</span><span class="token operator">*</span>outlen<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">EVP_EncryptFinal_ex</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> out <span class="token operator">+</span> tmplen<span class="token punctuation">,</span> outlen<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token operator">*</span>outlen <span class="token operator">+=</span> tmplen<span class="token punctuation">;</span>
<span class="token function">EVP_CIPHER_CTX_free</span><span class="token punctuation">(</span>ctx<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">/**
* @brief 对文件的加密内容进行解密
*
* @param fp 文件指针
* @param out 解密后数据
* @param outlen 解密后的数据长度
* @param key 秘钥，可以为NULL
* @return int 函数返回值
*/</span>
<span class="token keyword">int</span> <span class="token function">do_decrypt</span><span class="token punctuation">(</span>FILE<span class="token operator">*</span> fp<span class="token punctuation">,</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span><span class="token operator">*</span> out<span class="token punctuation">,</span> <span class="token keyword">int</span><span class="token operator">*</span> outlen<span class="token punctuation">,</span>
<span class="token keyword">const</span> <span class="token keyword">unsigned</span> <span class="token keyword">char</span><span class="token operator">*</span> key<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">int</span> tmplen <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
EVP_CIPHER_CTX<span class="token operator">*</span> ctx <span class="token operator">=</span> <span class="token function">EVP_CIPHER_CTX_new</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">EVP_DecryptInit_ex</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> <span class="token function">EVP_sm4_ecb</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">,</span> key<span class="token punctuation">,</span> <span class="token constant">NULL</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">unsigned</span> <span class="token keyword">char</span> buf<span class="token punctuation">[</span>BUFSIZE<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token number">0</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token class-name">size_t</span> nread <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>nread <span class="token operator">=</span> <span class="token function">fread</span><span class="token punctuation">(</span>buf<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> BUFSIZE<span class="token punctuation">,</span> fp<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">EVP_DecryptUpdate</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> out <span class="token operator">+</span> tmplen<span class="token punctuation">,</span> outlen<span class="token punctuation">,</span> buf<span class="token punctuation">,</span> nread<span class="token punctuation">)</span><span class="token punctuation">;</span>
tmplen <span class="token operator">+=</span> <span class="token punctuation">(</span><span class="token operator">*</span>outlen<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token function">EVP_DecryptFinal_ex</span><span class="token punctuation">(</span>ctx<span class="token punctuation">,</span> out <span class="token operator">+</span> tmplen<span class="token punctuation">,</span> outlen<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token operator">*</span>outlen <span class="token operator">+=</span> tmplen<span class="token punctuation">;</span>
<span class="token function">EVP_CIPHER_CTX_free</span><span class="token punctuation">(</span>ctx<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">int</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token keyword">int</span> argc<span class="token punctuation">,</span> <span class="token keyword">char</span> <span class="token keyword">const</span><span class="token operator">*</span> argv<span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">unsigned</span> <span class="token keyword">char</span> key<span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">6</span><span class="token punctuation">,</span> <span class="token number">7</span><span class="token punctuation">,</span>
<span class="token number">8</span><span class="token punctuation">,</span> <span class="token number">9</span><span class="token punctuation">,</span> <span class="token number">10</span><span class="token punctuation">,</span> <span class="token number">11</span><span class="token punctuation">,</span> <span class="token number">12</span><span class="token punctuation">,</span> <span class="token number">13</span><span class="token punctuation">,</span> <span class="token number">14</span><span class="token punctuation">,</span> <span class="token number">15</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> ret <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">int</span> outlen <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>argc <span class="token operator"><</span> <span class="token number">2</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"usage: %s <file name>\n"</span><span class="token punctuation">,</span> argv<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> <span class="token number">1</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
FILE<span class="token operator">*</span> fp <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span>argv<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token string">"r"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// encrypt</span>
<span class="token keyword">unsigned</span> <span class="token keyword">char</span> out<span class="token punctuation">[</span>BUFSIZ<span class="token punctuation">]</span><span class="token punctuation">;</span>
ret <span class="token operator">=</span> <span class="token function">do_encrypt</span><span class="token punctuation">(</span>fp<span class="token punctuation">,</span> out<span class="token punctuation">,</span> <span class="token operator">&</span>outlen<span class="token punctuation">,</span> key<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span>fp<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> <span class="token keyword">char</span><span class="token operator">*</span> enc_file <span class="token operator">=</span> <span class="token string">"/tmp/sm4_enc_file.txt"</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> <span class="token keyword">char</span><span class="token operator">*</span> dec_file <span class="token operator">=</span> <span class="token string">"/tmp/sm4_dec_file.txt"</span><span class="token punctuation">;</span>
FILE<span class="token operator">*</span> enc_fp <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span>enc_file<span class="token punctuation">,</span> <span class="token string">"w"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fwrite</span><span class="token punctuation">(</span>out<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> outlen<span class="token punctuation">,</span> enc_fp<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span>enc_fp<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"encrypt data write in %s\n"</span><span class="token punctuation">,</span> enc_file<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// decrypt</span>
enc_fp <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span>enc_file<span class="token punctuation">,</span> <span class="token string">"r"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
ret <span class="token operator">=</span> <span class="token function">do_decrypt</span><span class="token punctuation">(</span>fp<span class="token punctuation">,</span> out<span class="token punctuation">,</span> <span class="token operator">&</span>outlen<span class="token punctuation">,</span> key<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span>enc_fp<span class="token punctuation">)</span><span class="token punctuation">;</span>
FILE<span class="token operator">*</span> dec_fp <span class="token operator">=</span> <span class="token function">fopen</span><span class="token punctuation">(</span>dec_file<span class="token punctuation">,</span> <span class="token string">"w"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fwrite</span><span class="token punctuation">(</span>out<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> outlen<span class="token punctuation">,</span> dec_fp<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">fclose</span><span class="token punctuation">(</span>dec_fp<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">printf</span><span class="token punctuation">(</span><span class="token string">"decrypt data write in %s\n"</span><span class="token punctuation">,</span> dec_file<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> ret<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>编译运行：</p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash">$ gcc -g -Wall sm4_file1.c -lcrypto -std<span class="token operator">=</span>c11 -o sm4_file1
$ ./sm4_file1 sm4_file1.c
encrypt data <span class="token function">write</span> <span class="token keyword">in</span> /tmp/sm4_enc_file.txt
decrypt data <span class="token function">write</span> <span class="token keyword">in</span> /tmp/sm4_dec_file.txt<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
<p>然后可以在<code>/tmp/sm4_enc_file.txt</code>和<code>/tmp/sm4_dec_file.txt</code>查看加密和解密的内容。</p>
<h3 id="其他"><a href="#其他" class="headerlink" title="其他"></a>其他</h3><p>相关代码位于<a target="_blank" rel="noopener" href="https://gitee.com/nongguangxin/information_security.git">gitee仓库</a>，还包括其他SM2，SM3， SM4，数字信封，RSA，MD5，SHA等代码。</p>
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