Add DSA_dup() function

akamai · Dec 18, 2015 · 83cf048 · 83cf048
1 parent f78119f
commit 83cf048
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Showing 2 changed files with 47 additions and 0 deletions.
diff --git a/crypto/dsa/dsa_lib.c b/crypto/dsa/dsa_lib.c
@@ -289,3 +289,48 @@ DH *DSA_dup_DH(const DSA *r)
     return NULL;
 }
 #endif
+
+DSA *DSA_dup(const DSA *dsa)
+{
+    DSA *ret = NULL;
+
+    if (dsa == NULL)
+        goto err;
+
+    ret = DSA_new_method(dsa->engine);
+    if (ret == NULL)
+        goto err;
+
+    if (dsa->p != NULL)
+        if ((ret->p = BN_dup(dsa->p)) == NULL)
+            goto err;
+    if (dsa->q != NULL)
+        if ((ret->q = BN_dup(dsa->q)) == NULL)
+            goto err;
+    if (dsa->g != NULL)
+        if ((ret->g = BN_dup(dsa->g)) == NULL)
+            goto err;
+    if (dsa->pub_key != NULL)
+        if ((ret->pub_key = BN_dup(dsa->pub_key)) == NULL)
+            goto err;
+    if (dsa->priv_key != NULL)
+        if ((ret->priv_key = BN_dup(dsa->priv_key)) == NULL)
+            goto err;
+    if (dsa->kinv != NULL)
+        if ((ret->kinv = BN_dup(dsa->kinv)) == NULL)
+            goto err;
+    if (dsa->r != NULL)
+        if ((ret->r = BN_dup(dsa->r)) == NULL)
+            goto err;
+
+    if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_DSA, &ret->ex_data, &dsa->ex_data))
+        goto err;
+
+    ret->flags = dsa->flags;
+
+    return ret;
+
+ err:
+    DSA_free(ret);
+    return NULL;
+}
diff --git a/include/openssl/dsa.h b/include/openssl/dsa.h
@@ -267,6 +267,8 @@ int DSA_print_fp(FILE *bp, const DSA *x, int off);
 DH *DSA_dup_DH(const DSA *r);
 # endif
 
+DSA *DSA_dup(const DSA *r);
+
 # define EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits) \
         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN, \
                                 EVP_PKEY_CTRL_DSA_PARAMGEN_BITS, nbits, NULL)