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/* See LICENSE file for copyright and license details. */
#include "common.h"
size_t
libar2_encode_params(char *buf, const struct libar2_argon2_parameters *params)
{
size_t off;
#define FMT_AND_ARGS_HEAD\
"$%s$",\
libar2_type_to_string(params->type, LIBAR2_LOWER_CASE)
#define FMT_AND_ARGS_VERSION\
"v=%i$",\
(int)params->version
#define FMT_AND_ARGS_TAIL\
"m=%lu,t=%lu,p=%lu$",\
(unsigned long int)params->m_cost,\
(unsigned long int)params->t_cost,\
(unsigned long int)params->lanes
if (buf) {
off = (size_t)sprintf(buf, FMT_AND_ARGS_HEAD);
if (params->version)
off += (size_t)sprintf(&buf[off], FMT_AND_ARGS_VERSION);
off += (size_t)sprintf(&buf[off], FMT_AND_ARGS_TAIL);
off += libar2_encode_base64(&buf[off], params->salt, params->saltlen) - 1;
buf[off++] = '$';
buf[off++] = '\0';
} else {
off = (size_t)snprintf(NULL, 0, FMT_AND_ARGS_HEAD);
if (params->version)
off += (size_t)snprintf(NULL, 0, FMT_AND_ARGS_VERSION);
off += (size_t)snprintf(NULL, 0, FMT_AND_ARGS_TAIL);
off += libar2_encode_base64(NULL, params->salt, params->saltlen) - 1;
off += 2;
}
return off;
}
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