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More work on aes encryption stuff.

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This commit is contained in:
lotodore
2009-12-29 18:23:45 +00:00
parent 1273908efb
commit a20711d5ac
1 changed files with 19 additions and 6 deletions
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src/core/common/crypthelper.cpp
+19 -6
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@@ -237,18 +237,19 @@ CryptHelper::AES128Encrypt(unsigned char *keyData, unsigned keySize, unsigned ch
bool retVal = false;
if (keySize && plainSize)
{
outCipher.clear();
const int AESBlockSize = 16;
// The key/iv derivation is kind of like EVP_BytesToKey of OpenSSL with count 2 and no salt.
// EVP_BytesToKey is not used because there is nothing like it in GnuTLS or gcrypt.
SHA1Buf tmpBuf1, tmpBuf2, keyBuf1, keyBuf2;
unsigned char key[16];
unsigned char iv[16];
unsigned char key[AESBlockSize];
unsigned char iv[AESBlockSize];
// First 20 bytes
CryptHelper::SHA1Hash(keyData, keySize, tmpBuf1);
CryptHelper::SHA1Hash(tmpBuf1.GetData(), tmpBuf1.GetDataSize(), keyBuf1);
// Second 20 bytes (we only need 32 bytes, but anyway).
// Second 20 bytes (we only need a total of 32 bytes, but anyway).
unsigned tmpKeySize = keySize + keyBuf1.GetDataSize();
unsigned char *tmpKeyData = new unsigned char[tmpKeySize];
// Concatenate our first hash and the key data.
memcpy(tmpKeyData, keyBuf1.GetData(), keyBuf1.GetDataSize());
memcpy(tmpKeyData + keyBuf1.GetDataSize(), keyData, keySize);
CryptHelper::SHA1Hash(tmpKeyData, tmpKeySize, tmpBuf2);
@@ -259,12 +260,24 @@ CryptHelper::AES128Encrypt(unsigned char *keyData, unsigned keySize, unsigned ch
unsigned tmpivBytes = keyBuf1.GetDataSize() - sizeof(key);
memcpy(iv, keyBuf1.GetData() + sizeof(key), tmpivBytes);
memcpy(iv + tmpivBytes, keyBuf2.GetData(), sizeof(iv) - tmpivBytes);
// Perform the encryption.
#ifdef HAVE_OPENSSL
EVP_CIPHER_CTX encryptCtx;
EVP_CIPHER_CTX_init(&encryptCtx);
EVP_EncryptInit(&encryptCtx, EVP_aes_128_cbc(), key, iv);
//outCipher.resize(AES_BLOCK_SIZE
//EVP_EncryptUpdate(encryptCtx, ciphertext, &c_len, plaintext, *len);
int cipherSize = plainSize + AESBlockSize; // Maximum possible size + 1
outCipher.resize(cipherSize);
int updateCipherSize = cipherSize;
EVP_EncryptUpdate(&encryptCtx, &outCipher[0], &updateCipherSize, plainData, plainSize);
if (updateCipherSize)
{
int finalCipherSize = cipherSize - updateCipherSize;
EVP_EncryptFinal(&encryptCtx, &outCipher[updateCipherSize], &finalCipherSize);
outCipher.resize(updateCipherSize + finalCipherSize);
retVal = true;
}
else
outCipher.clear();
#else
// TODO
#endif