RSA Security 5 manual Tmemcmp, Blocks are equal

T_memcmp

T_memcmp

int T_memcmp (
POINTER	firstBlock,	/* first block */
POINTER	secondBlock,	/* second block */
unsigned int	len	/* length of blocks */
);

Description

T_memcmp compares the first len bytes of firstBlock and secondBlock. The value of len can be zero, in which case firstBlock and secondBlock are undefined and T_memcmp returns zero. T_memcmp compares the blocks by scanning the blocks from lowest address to highest until a difference is found. The smaller-valued block is the one with the smaller-valued byte at the point of difference. If no difference is found, then the blocks are equal.

Return value

Value	Description
< 0	firstBlock is smaller.
0	The blocks are equal.
> 0	firstBlock is larger.

3 4 2 R S A B S A F E C r y p t o - C L i b r a r y R e f e r e n c e M a n u a l