| /* 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@iahu.ca, http://libtomcrypt.org |
| */ |
| #include "mycrypt.h" |
| |
| #ifdef MDSA |
| |
| int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key) |
| { |
| unsigned long x, y; |
| int err; |
| |
| _ARGCHK(in != NULL); |
| _ARGCHK(key != NULL); |
| |
| /* check length */ |
| if ((1+2+PACKET_SIZE) > inlen) { |
| return CRYPT_INVALID_PACKET; |
| } |
| |
| /* check type */ |
| if ((err = packet_valid_header((unsigned char *)in, PACKET_SECT_DSA, PACKET_SUB_KEY)) != CRYPT_OK) { |
| return err; |
| } |
| y = PACKET_SIZE; |
| |
| /* init key */ |
| if (mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL) != MP_OKAY) { |
| return CRYPT_MEM; |
| } |
| |
| /* read type/qord */ |
| key->type = in[y++]; |
| key->qord = ((unsigned)in[y]<<8)|((unsigned)in[y+1]); |
| y += 2; |
| |
| /* input publics */ |
| INPUT_BIGNUM(&key->g,in,x,y, inlen); |
| INPUT_BIGNUM(&key->p,in,x,y, inlen); |
| INPUT_BIGNUM(&key->q,in,x,y, inlen); |
| INPUT_BIGNUM(&key->y,in,x,y, inlen); |
| if (key->type == PK_PRIVATE) { |
| INPUT_BIGNUM(&key->x,in,x,y, inlen); |
| } |
| |
| return CRYPT_OK; |
| error: |
| mp_clear_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL); |
| return err; |
| } |
| |
| #endif |