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/* See LICENSE file for copyright and license details. */
#include "common.h"
static size_t
decode_u32(const char *s, uint_least32_t *outp)
{
uint_least32_t digit;
size_t i;
if ((s[0] == '0' && s[1] != '0') || !isdigit(s[0])) {
errno = EINVAL;
return 0;
}
*outp = 0;
for (i = 0; isdigit(s[i]); i++) {
digit = (uint_least32_t)(s[i] & 15);
if (*outp > (UINT_LEAST32_C(0xFFFFffff) - digit) / 10) {
errno = ERANGE;
return 0;
}
*outp = *outp * 10 + digit;
}
return i;
}
size_t
libar2_decode_params(const char *str, struct libar2_argon2_parameters *params, char **bufp, struct libar2_context *ctx)
{
const char *start = str;
uint_least32_t u32;
size_t n, q, r;
*bufp = NULL;
params->salt = NULL;
params->saltlen = 0;
params->key = NULL;
params->keylen = 0;
params->ad = NULL;
params->adlen = 0;
if (*str++ != '$')
goto einval;
if (libar2_string_to_type(str, ¶ms->type))
goto fail;
while (*str && *str != '$')
str++;
if (*str++ != '$')
goto einval;
if (str[0] == 'v' && str[1] == '=') {
n = decode_u32(&str[2], &u32);
if (!n)
goto fail;
if (u32 > (uint_least32_t)INT_MAX)
goto erange;
params->version = (enum libar2_argon2_version)u32;
str += n + 2;
if (*str++ != '$')
goto einval;
} else {
params->version = 0; /* implicit LIBAR2_ARGON2_VERSION_10 */
}
if (str[0] != 'm' || str[1] != '=')
goto einval;
str += 2;
n = decode_u32(str, ¶ms->m_cost);
if (!n)
goto fail;
str += n;
if (str[0] != ',' || str[1] != 't' || str[2] != '=')
goto einval;
str += 3;
n = decode_u32(str, ¶ms->t_cost);
if (!n)
goto fail;
str += n;
if (str[0] != ',' || str[1] != 'p' || str[2] != '=')
goto einval;
str += 3;
n = decode_u32(str, ¶ms->lanes);
if (!n)
goto fail;
str += n;
if (*str++ != '$')
goto einval;
n = libar2_decode_base64(str, NULL, ¶ms->saltlen);
if (params->saltlen) {
*bufp = ctx->allocate(params->saltlen, sizeof(char), ALIGNOF(char), ctx);
if (!*bufp)
goto fail;
}
str += libar2_decode_base64(str, *bufp, ¶ms->saltlen);
params->salt = (void *)*bufp;
if (*str++ != '$')
goto einval;
params->hashlen = 0;
while (isalnum(str[params->hashlen]) || str[params->hashlen] == '+' || str[params->hashlen] == '/')
params->hashlen += 1;
q = params->hashlen / 4;
r = params->hashlen % 4;
params->hashlen = q * 3 + (r == 3 ? 2 : r == 2 ? 1 : 0);
return (size_t)(str - start);
erange:
errno = ERANGE;
goto fail;
einval:
errno = EINVAL;
fail:
if (*bufp) {
ctx->deallocate(*bufp, ctx);
*bufp = NULL;
}
return 0;
}
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