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Diffstat (limited to '')
| -rw-r--r-- | util/libkeccak_behex_lower.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/util/libkeccak_behex_lower.c b/util/libkeccak_behex_lower.c index 07593e8..70f5c01 100644 --- a/util/libkeccak_behex_lower.c +++ b/util/libkeccak_behex_lower.c @@ -12,11 +12,22 @@ void libkeccak_behex_lower(char *restrict output, const void *restrict hashsum_, size_t n) { +#define S(X)\ + X"0", X"1", X"2", X"3", X"4", X"5", X"6", X"7",\ + X"8", X"9", X"a", X"b", X"c", X"d", X"e", X"f" +#if defined(__GNUC__) + __attribute__((__nonstring__)) +#endif + static const char lut[256][2] = { + S("0"), S("1"), S("2"), S("3"), S("4"), S("5"), S("6"), S("7"), + S("8"), S("9"), S("a"), S("b"), S("c"), S("d"), S("e"), S("f") + }; + const unsigned char *restrict hashsum = hashsum_; output[2 * n] = '\0'; while (n--) { - output[2 * n + 0] = "0123456789abcdef"[(hashsum[n] >> 4) & 15]; - output[2 * n + 1] = "0123456789abcdef"[(hashsum[n] >> 0) & 15]; + output[2 * n + 0] = lut[hashsum[n]][0]; + output[2 * n + 1] = lut[hashsum[n]][1]; } } |