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adding dsa_import_radix

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Karel Miko 2017-02-21 12:49:20 +01:00 committed by Steffen Jaeckel
parent a8df316581
commit 10545366d2
2 changed files with 68 additions and 0 deletions
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1
src/headers/tomcrypt_pk.h
View File

@ -430,6 +430,7 @@ int dsa_decrypt_key(const unsigned char *in, unsigned long inlen,
unsigned char *out, unsigned long *outlen,
dsa_key *key);
int dsa_import_radix(int radix, char *p, char *q, char *g, char *x, char *y, dsa_key *key);
int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key);
int dsa_export(unsigned char *out, unsigned long *outlen, int type, dsa_key *key);
int dsa_verify_key(dsa_key *key, int *stat);

67
src/pk/dsa/dsa_import_radix.c Executable file
View File

@ -0,0 +1,67 @@
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
*/
#include "tomcrypt.h"
/**
Import DSA public or private key from raw numbers
@param radix the radix the numbers are represented in (2-64, 16 = hexadecimal)
@param p DSA's p in radix representation
@param q DSA's q in radix representation
@param g DSA's g in radix representation
@param x DSA's x in radix representation (only private key, NULL for public key)
@param y DSA's y in radix representation
@param key [out] the destination for the imported key
@return CRYPT_OK if successful, upon error allocated memory is freed
*/
#ifdef LTC_MDSA
int dsa_import_radix(int radix, char *p, char *q, char *g, char *x, char *y, dsa_key *key)
{
int err;
LTC_ARGCHK(p != NULL);
LTC_ARGCHK(q != NULL);
LTC_ARGCHK(g != NULL);
LTC_ARGCHK(y != NULL);
LTC_ARGCHK(ltc_mp.name != NULL);
/* init key */
err = mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL);
if (err != CRYPT_OK) return err;
if ((err = mp_read_radix(key->p , p , radix)) != CRYPT_OK) { goto LBL_ERR; }
if ((err = mp_read_radix(key->q , q , radix)) != CRYPT_OK) { goto LBL_ERR; }
if ((err = mp_read_radix(key->g , g , radix)) != CRYPT_OK) { goto LBL_ERR; }
if ((err = mp_read_radix(key->y , y , radix)) != CRYPT_OK) { goto LBL_ERR; }
if (x && strlen(x) > 0) {
key->type = PK_PRIVATE;
if ((err = mp_read_radix(key->x , x , radix)) != CRYPT_OK) { goto LBL_ERR; }
}
else {
key->type = PK_PUBLIC;
}
key->qord = mp_unsigned_bin_size(key->q);
if (key->qord >= LTC_MDSA_MAX_GROUP || key->qord <= 15 ||
(unsigned long)key->qord >= mp_unsigned_bin_size(key->p) || (mp_unsigned_bin_size(key->p) - key->qord) >= LTC_MDSA_DELTA) {
err = CRYPT_INVALID_PACKET;
goto LBL_ERR;
}
return CRYPT_OK;
LBL_ERR:
mp_clear_multi(key->p, key->g, key->q, key->x, key->y, NULL);
return err;
}
#endif