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Constant-time sodium_bin2hex()

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Original C# code by CodesInChaos.
This commit is contained in:
Frank Denis 2014-10-07 20:50:26 -07:00
parent 5c3c132e47
commit 814df1e60d
1 changed files with 7 additions and 9 deletions
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16
src/libsodium/sodium/utils.c
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@ -96,22 +96,20 @@ char *
sodium_bin2hex(char * const hex, const size_t hex_maxlen,
const unsigned char * const bin, const size_t bin_len)
{
static const char hexdigits[16] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
size_t i = (size_t) 0U;
size_t j = (size_t) 0U;
size_t i = (size_t) 0U;
int b;
if (bin_len >= SIZE_MAX / 2 || hex_maxlen < bin_len * 2U) {
abort(); /* LCOV_EXCL_LINE */
}
while (i < bin_len) {
hex[j++] = hexdigits[bin[i] >> 4];
hex[j++] = hexdigits[bin[i] & 0xf];
b = bin[i] >> 4;
hex[i * 2U] = (char) (87 + b + (((b - 10) >> 31) & -39));
b = bin[i] & 0xf;
hex[i * 2U + 1U] = (char) (87 + b + (((b - 10) >> 31) & -39));
i++;
}
hex[j] = 0;
hex[i * 2U] = 0;
return hex;
}