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Clarify what sodium_memcmp() is for.

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Frank Denis 2014-07-28 16:10:19 -07:00
parent e06ae6db9d
commit a91e0123cf
1 changed files with 5 additions and 0 deletions
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5
src/libsodium/include/sodium/utils.h
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@ -22,6 +22,11 @@ unsigned char *_sodium_alignedcalloc(unsigned char ** const unaligned_p,
SODIUM_EXPORT SODIUM_EXPORT
void sodium_memzero(void * const pnt, const size_t len); void sodium_memzero(void * const pnt, const size_t len);
/* WARNING: sodium_memcmp() must be used to verify if two secret keys
* are equal, in constant time.
* It returns 0 if the keys are equal, and -1 if they differ.
* This function is not designed for lexicographical comparisons.
*/
SODIUM_EXPORT SODIUM_EXPORT
int sodium_memcmp(const void * const b1_, const void * const b2_, size_t len); int sodium_memcmp(const void * const b1_, const void * const b2_, size_t len);