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improvements to memory comparison

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This commit is contained in:
Stephen Lombardo 2012-10-02 12:36:25 -04:00
parent 9a6807e1b6
commit 273558efc6
1 changed files with 4 additions and 4 deletions
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8
src/crypto_impl.c
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@ -139,15 +139,15 @@ int sqlcipher_ismemset(const unsigned char *a0, unsigned char value, int len) {
return noMatch;
}
/* fixed time memory comparison routine */
/* constant time memory comparison routine. returns 0 if match, 1 if no match */
int sqlcipher_memcmp(const unsigned char *a0, const unsigned char *a1, int len) {
int i = 0, noMatch = 0;
int i = 0, result = 0;
for(i = 0; i < len; i++) {
noMatch = (noMatch || (a0[i] != a1[i]));
result |= a0[i] ^ a1[i];
}
return noMatch;
return (result != 0);
}
/* generate a defined number of pseudorandom bytes */