size_t Rijndael::blockDecrypt(const byte *input, size_t inputLen, byte *outBuffer) { if (input == 0 || inputLen <= 0) return 0; byte block[16], iv[4][4]; memcpy(iv,m_initVector,16); size_t numBlocks=inputLen/16; for (size_t i = numBlocks; i > 0; i--) { decrypt(input, block); Xor128(block,block,(byte*)iv); #if STRICT_ALIGN memcpy(iv, input, 16); memcpy(outBuf, block, 16); #else Copy128((byte*)iv,input); Copy128(outBuffer,block); #endif input += 16; outBuffer += 16; } memcpy(m_initVector,iv,16); return 16*numBlocks; }
void Rijndael::blockDecrypt(const byte *input, size_t inputLen, byte *outBuffer) { if (inputLen <= 0) return; size_t numBlocks=inputLen/16; #ifdef USE_SSE if (AES_NI) { blockDecryptSSE(input,numBlocks,outBuffer); return; } #endif byte block[16], iv[4][4]; memcpy(iv,m_initVector,16); for (size_t i = numBlocks; i > 0; i--) { byte temp[4][4]; Xor128(temp,input,m_expandedKey[m_uRounds]); Xor128(block, T5[temp[0][0]],T6[temp[3][1]],T7[temp[2][2]],T8[temp[1][3]]); Xor128(block+4, T5[temp[1][0]],T6[temp[0][1]],T7[temp[3][2]],T8[temp[2][3]]); Xor128(block+8, T5[temp[2][0]],T6[temp[1][1]],T7[temp[0][2]],T8[temp[3][3]]); Xor128(block+12,T5[temp[3][0]],T6[temp[2][1]],T7[temp[1][2]],T8[temp[0][3]]); for(int r = m_uRounds-1; r > 1; r--) { Xor128(temp,block,m_expandedKey[r]); Xor128(block, T5[temp[0][0]],T6[temp[3][1]],T7[temp[2][2]],T8[temp[1][3]]); Xor128(block+4, T5[temp[1][0]],T6[temp[0][1]],T7[temp[3][2]],T8[temp[2][3]]); Xor128(block+8, T5[temp[2][0]],T6[temp[1][1]],T7[temp[0][2]],T8[temp[3][3]]); Xor128(block+12,T5[temp[3][0]],T6[temp[2][1]],T7[temp[1][2]],T8[temp[0][3]]); } Xor128(temp,block,m_expandedKey[1]); block[ 0] = S5[temp[0][0]]; block[ 1] = S5[temp[3][1]]; block[ 2] = S5[temp[2][2]]; block[ 3] = S5[temp[1][3]]; block[ 4] = S5[temp[1][0]]; block[ 5] = S5[temp[0][1]]; block[ 6] = S5[temp[3][2]]; block[ 7] = S5[temp[2][3]]; block[ 8] = S5[temp[2][0]]; block[ 9] = S5[temp[1][1]]; block[10] = S5[temp[0][2]]; block[11] = S5[temp[3][3]]; block[12] = S5[temp[3][0]]; block[13] = S5[temp[2][1]]; block[14] = S5[temp[1][2]]; block[15] = S5[temp[0][3]]; Xor128(block,block,m_expandedKey[0]); if (CBCMode) Xor128(block,block,iv); Copy128((byte*)iv,input); Copy128(outBuffer,block); input += 16; outBuffer += 16; } memcpy(m_initVector,iv,16); }