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cardcrypto.cpp
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cardcrypto.cpp
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// CardCrypto.cpp Copyright 2013 Owen Lynn <owen.lynn@gmail.com>
// Released under the GNU Public License V3
#include "cardcrypto.h"
#include "openssl/sha.h"
#include "openssl/evp.h"
#include "openssl/rand.h"
#include "openssl/rsa.h"
#include "openssl/pem.h"
#include "openssl/err.h"
#include "openssl/aes.h"
CardCrypto::CardCrypto(QByteArray & rnd_seed_data) : m_rsakeydata(0)
{
// init the RNG (needed for RSA keygen)
const RAND_METHOD *temp = RAND_get_rand_method();
RAND_set_rand_method(temp);
RAND_seed(rnd_seed_data.data(),rnd_seed_data.length());
}
CardCrypto::~CardCrypto()
{
if (m_rsakeydata) {
RSA_free(m_rsakeydata);
m_rsakeydata = 0;
}
}
bool
CardCrypto::RNGGetBytes(QByteArray &out, int num_bytes)
{
unsigned char buf[256];
int bytes_left = num_bytes;
int rc1 = 1;
out.clear();
while (rc1 && bytes_left > 0) {
int bytes_to_get = (size_t)bytes_left > sizeof(buf) ? sizeof(buf) : bytes_left;
rc1 = RAND_bytes(buf,bytes_to_get);
if (rc1) {
bytes_left -= bytes_to_get;
out += QByteArray((char *)buf,bytes_to_get);
}
}
return (rc1 != 0);
}
bool CardCrypto::RSALoadKeyPEM(const QString &filename)
{
bool rc = false;
if (m_rsakeydata) {
RSA_free(m_rsakeydata);
m_rsakeydata = 0;
}
FILE *fp = fopen(filename.toLocal8Bit().data(), "rb");
rc = (fp != NULL);
if (rc) {
m_rsakeydata = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
fclose(fp);
fp = NULL;
rc = (m_rsakeydata != NULL);
}
return rc;
}
bool
CardCrypto::RSAGenerateNewKeyPair(int keylen)
{
if (m_rsakeydata) {
RSA_free(m_rsakeydata);
m_rsakeydata = 0;
}
m_rsakeydata = RSA_generate_key(keylen,3,NULL,NULL);
return (m_rsakeydata != 0);
}
bool
CardCrypto::RSAExportPublicKeyInPKCS1(QByteArray & out)
{
bool rc = false;
if (m_rsakeydata) {
QByteArray pem_out;
BIO * mem = BIO_new(BIO_s_mem());
if (mem) {
rc = (PEM_write_bio_RSAPublicKey(mem,m_rsakeydata) != 0);
char * p = 0;
int len = BIO_get_mem_data(mem,&p);
pem_out = QByteArray(p,len);
BIO_free(mem);
mem = 0;
}
if (rc) {
// chop off the header and footer and then base64 decode it
// what you have left is a PKCS1 RSA public key in binary DER format
QByteArray b64buf = pem_out.right((pem_out.length() -
sizeof("-----BEGIN RSA PUBLIC KEY-----"))
);
b64buf.chop(sizeof("-----END RSA PUBLIC KEY-----"));
out = QByteArray::fromBase64(b64buf);
}
}
return rc;
}
bool
CardCrypto::RSAEncryptWithPublicKey(QByteArray &in, QByteArray &out)
{
bool rc = false;
if (m_rsakeydata) {
unsigned char outbuf[8192];
int outlen = RSA_size(m_rsakeydata);
if (sizeof(outbuf) > (size_t)outlen) {
if (RSA_public_encrypt(in.length(),(unsigned char *)in.data(),outbuf,m_rsakeydata,RSA_PKCS1_PADDING) != -1) {
out = QByteArray((const char *)outbuf,outlen);
rc = true;
}
}
}
return rc;
}
bool
CardCrypto::RSADecryptWithPrivateKey(QByteArray &in, QByteArray &out)
{
bool rc = false;
if (m_rsakeydata) {
unsigned char outbuf[8192];
int outlen = RSA_private_decrypt(in.length(),(unsigned char *)in.data(),outbuf,m_rsakeydata,RSA_PKCS1_PADDING);
if (outlen > 0) {
out = QByteArray((char *)outbuf,outlen);
rc = true;
}
}
return rc;
}
bool
CardCrypto::AES256CBCEncrypt(QByteArray &key,QByteArray &iv,QByteArray &in,QByteArray &out)
{
out.clear();
AES_KEY teh_key;
AES_set_encrypt_key((const unsigned char *)key.data(),256,&teh_key);
bool firstblock = true;
int i=0,j=0;
unsigned char plainblock[16];
unsigned char cipherblock[16];
while (i < in.length()) {
memset(plainblock,0,sizeof(plainblock));
unsigned char *p = plainblock;
for(j=i; j<i+16 && j<in.length(); ++j) {
*p = in[j];
++p;
}
i = j;
if (firstblock) {
firstblock = false;
for(int k=0; k<16; ++k) { plainblock[k] ^= iv[k]; }
} else {
for(int k=0; k<16; ++k) { plainblock[k] ^= cipherblock[k]; }
}
AES_encrypt(plainblock,cipherblock,&teh_key);
out.append((const char *)cipherblock,16);
}
return true;
}
bool
CardCrypto::AES256CBCDecrypt(QByteArray &key,QByteArray &iv,QByteArray &in,QByteArray &out)
{
out.clear();
AES_KEY teh_key;
AES_set_decrypt_key((const unsigned char *)key.data(),256,&teh_key);
bool firstblock = true;
int i=0,j=0;
unsigned char block[16];
unsigned char plainblock[16];
unsigned char cipherblock[16];
while (i < in.length()) {
memset(block,0,sizeof(block));
unsigned char *p = block;
for(j=i; j<i+16 && j<in.length(); ++j) {
*p = in[j];
++p;
}
i = j;
AES_decrypt(block,plainblock,&teh_key);
if (firstblock) {
firstblock = false;
for(int k=0; k<16; ++k) { plainblock[k] ^= iv[k]; }
} else {
for(int k=0; k<16; ++k) { plainblock[k] ^= cipherblock[k]; }
}
memcpy(cipherblock,block,16);
out.append((const char*)plainblock,sizeof(plainblock));
}
return true;
}
bool
CardCrypto::SHA256Hash(QByteArray &in, QByteArray &out)
{
bool rc = false;
unsigned char digest[SHA256_DIGEST_LENGTH];
SHA256_CTX hasherctx;
rc = (SHA256_Init(&hasherctx) != 0);
if (rc) {
rc = (SHA256_Update(&hasherctx,in.data(),in.length()) != 0);
if (rc) {
rc = (SHA256_Final(digest,&hasherctx) != 0);
out = QByteArray((const char *)digest,SHA256_DIGEST_LENGTH);
}
}
return rc;
}
long
CardCrypto::CheckSum(const QByteArray &in)
{
long sum = 0;
for (int i=0; i<in.length(); ++i) {
sum += (unsigned char)in[i];
}
return sum;
}