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byte_start(3)		   Library Functions Manual		 byte_start(3)

NAME
       byte_start - find out if	string b is prefix of string a

SYNTAX
       #include	<libowfat/byte.h>

       int byte_start(const char *a,size_t alen,const char *b,size_t blen);

DESCRIPTION
       byte_start  returns  1  if alen >= blen and the first blen bytes	from a
       and b are equal.

       When blen is too	large or the strings are  different,  byte_start  does
       not read	bytes past the first difference. An attacker observing the ex-
       ecution timing can thus learn where the first mismatch happened.

       Use  byte_equal_notimingattack to compare keys, passphrases, cookies or
       hashes instead.

SEE ALSO
       byte_equal(3), byte_equal_notimingattack(3), byte_starts(3)

								 byte_start(3)

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