Function SHA1ProcessMessageBlock

src/HexRaysCodeXplorer/Utility.cpp:169–242

}

void SHA1ProcessMessageBlock(SHA1Context *context)
{
	const uint32_t K[] = { 0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6};
	int t; // Loop counter
	uint32_t temp; // Temporary word value
	uint32_t W[80]; // Word sequence
	uint32_t A, B, C, D, E; // Word buffers
							// Initialize the first 16 words in the array W
	for (t = 0; t < 16; t++)
	{
		W[t] = context->Message_Block[t * 4] << 24;
		W[t] |= context->Message_Block[t * 4 + 1] << 16;
		W[t] |= context->Message_Block[t * 4 + 2] << 8;
		W[t] |= context->Message_Block[t * 4 + 3];
	}

	for (t = 16; t < 80; t++)
		W[t] = SHA1CircularShift(1, W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16]);
	
	A = context->Intermediate_Hash[0];
	B = context->Intermediate_Hash[1];
	C = context->Intermediate_Hash[2];
	D = context->Intermediate_Hash[3];
	E = context->Intermediate_Hash[4];

	for (t = 0; t < 20; t++)
	{
		temp = SHA1CircularShift(5, A) +
			((B & C) | ((~B) & D)) + E + W[t] + K[0];
		E = D;
		D = C;
		C = SHA1CircularShift(30, B);
		B = A;
		A = temp;
	}

	for (t = 20; t < 40; t++)
	{
		temp = SHA1CircularShift(5, A) + (B ^ C ^ D) + E + W[t] + K[1];
		E = D;
		D = C;
		C = SHA1CircularShift(30, B);
		B = A;
		A = temp;
	}

	for (t = 40; t < 60; t++)
	{
		temp = SHA1CircularShift(5, A) +
			((B & C) | (B & D) | (C & D)) + E + W[t] + K[2];
		E = D;
		D = C;
		C = SHA1CircularShift(30, B);
		B = A;
		A = temp;
	}

	for (t = 60; t < 80; t++)