memcmp - compare memory areas
The memcmp() function compares the first
n bytes (each interpreted as
unsigned char) of the memory areas
The memcmp() function returns an integer less than, equal to, or greater than zero if the first
n bytes of
s1 is found, respectively, to be less than, to match, or be greater than the first
n bytes of
For a nonzero return value, the sign is determined by the sign of the difference between the first pair of bytes (interpreted as
unsigned char) that differ in
n is zero, the return value is zero.
POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD.
Do not use memcmp() to compare security critical data, such as cryptographic secrets, because the required CPU time depends on the number of equal bytes. Instead, a function that performs comparisons in constant time is required. Some operating systems provide such a function (e.g., NetBSD's consttime_memequal()), but no such function is specified in POSIX. On Linux, it may be necessary to implement such a function oneself.
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