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bignum: harmonize gcrypt, libcrypto and libmcrypt bignum

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Ensure most of the abstraction around the 3 libs are consistent.

Signed-off-by: Aris Adamantiadis <aris@0xbadc0de.be>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Aris Adamantiadis
2015-12-31 10:48:34 +01:00
committed by Andreas Schneider
parent 43a4f86b6e
commit afe2673cfa
11 changed files with 178 additions and 219 deletions
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40
src/mbedcrypto_missing.c
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@@ -45,7 +45,7 @@ void ssh_mbedcry_bn_free(bignum bn)
SAFE_FREE(bn);
}
char *ssh_mbedcry_bn2num(bignum num, int radix)
unsigned char *ssh_mbedcry_bn2num(bignum num, int radix)
{
char *buf = NULL;
size_t olen;
@@ -67,7 +67,7 @@ char *ssh_mbedcry_bn2num(bignum num, int radix)
return NULL;
}
return buf;
return (unsigned char *) buf;
}
int ssh_mbedcry_rand(bignum rnd, int bits, int top, int bottom)
@@ -127,4 +127,40 @@ int ssh_mbedcry_is_bit_set(bignum num, size_t pos)
bit = mbedtls_mpi_get_bit(num, pos);
return bit;
}
/** @brief generates a random integer between 0 and max
* @returns 1 in case of success, 0 otherwise
*/
int ssh_mbedcry_rand_range(bignum dest, bignum max)
{
size_t bits;
bignum rnd;
bits = bignum_num_bits(max) + 64;
rnd = bignum_new();
if (rnd == NULL){
return 0;
}
bignum_rand(rnd, bits);
mbedtls_mpi_mod_mpi(dest, rnd, max);
bignum_safe_free(rnd);
return 1;
}
int ssh_mbedcry_hex2bn(bignum *dest, char *data)
{
int rc;
*dest = bignum_new();
if (*dest == NULL){
return 0;
}
rc = mbedtls_mpi_read_string(*dest, 16, data);
if (rc == 0) {
return 1;
}
return 0;
}
#endif