Function MD5Update

src/utils/mkFileSum.c:196–224

MD5 block update operation. Continues an MD5 message-digest operation, processing another message block, and updating the context. */

  context.
 */
void MD5Update (MD5_CTX *context, const unsigned char *input, unsigned int inputLen)
{
	unsigned int i, index, partLen;

	/* Compute number of bytes mod 64 */
	index = (unsigned int)((context->count[0] >> 3) & 0x3F);

	/* Update number of bits */
	if ((context->count[0] += ((UINT4)inputLen << 3)) < ((UINT4)inputLen << 3)) {
		context->count[1]++;
	}
	context->count[1] += ((UINT4)inputLen >> 29);
	partLen = 64 - index;

	/* Transform as many times as possible. */
	if (inputLen >= partLen) {
		MD5_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
		MD5Transform (context->state, context->buffer);

		for (i = partLen; i + 63 < inputLen; i += 64) {
			MD5Transform (context->state, &input[i]);
		}
		index = 0;
	} else {
		i = 0;
	}
	/* Buffer remaining input */
	MD5_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
}

/* MD5 finalization. Ends an MD5 message-digest operation, writing the
 * the message digest and zeroizing the context.