Method transf

src/common/sha2/sha2.cpp:214–329

/* SHA-256 context structure */

void sha256_ctx::transf(const unsigned char* message,
				   unsigned int block_nb)
{
	typedef sha2_types::uint32 uint32;

	sha256_ctx* const ctx=this;

	uint32 w[64];
	uint32 wv[8];

	for (int i = 0; i < (int) block_nb; i++)
	{
		const unsigned char* const sub_block = message + (i << 6);

#ifndef UNROLL_LOOPS
		for (int j = 0; j < 16; j++)
		{
			PACK32(&sub_block[j << 2], &w[j]);
		}

		for (int j = 16; j < 64; j++)
		{
			SHA256_SCR(j);
		}

		for (int j = 0; j < 8; j++)
		{
			wv[j] = ctx->h[j];
		}

		for (int j = 0; j < 64; j++)
		{
			const uint32 t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6])	+ sha256_k[j] + w[j];
			const uint32 t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
			wv[7] = wv[6];
			wv[6] = wv[5];
			wv[5] = wv[4];
			wv[4] = wv[3] + t1;
			wv[3] = wv[2];
			wv[2] = wv[1];
			wv[1] = wv[0];
			wv[0] = t1 + t2;
		}

		for (int j = 0; j < 8; j++)
		{
			ctx->h[j] += wv[j];
		}
#else
		PACK32(&sub_block[ 0], &w[ 0]); PACK32(&sub_block[ 4], &w[ 1]);
		PACK32(&sub_block[ 8], &w[ 2]); PACK32(&sub_block[12], &w[ 3]);
		PACK32(&sub_block[16], &w[ 4]); PACK32(&sub_block[20], &w[ 5]);
		PACK32(&sub_block[24], &w[ 6]); PACK32(&sub_block[28], &w[ 7]);
		PACK32(&sub_block[32], &w[ 8]); PACK32(&sub_block[36], &w[ 9]);
		PACK32(&sub_block[40], &w[10]); PACK32(&sub_block[44], &w[11]);
		PACK32(&sub_block[48], &w[12]); PACK32(&sub_block[52], &w[13]);
		PACK32(&sub_block[56], &w[14]); PACK32(&sub_block[60], &w[15]);