diff options
| -rw-r--r-- | man3/memcmp.3 | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/man3/memcmp.3 b/man3/memcmp.3 index de93d22dcf..0d053e6d72 100644 --- a/man3/memcmp.3 +++ b/man3/memcmp.3 @@ -68,6 +68,12 @@ The function is thread-safe. .SH CONFORMING TO SVr4, 4.3BSD, C89, C99, POSIX.1-2001. +.SH NOTES +.PP +Do not use +.BR memcmp () +to compare security critical data, such as cryptographic secrets, +because the required CPU time depends on the amount of equal bytes. .SH SEE ALSO .BR bcmp (3), .BR strcasecmp (3), |