Mercurial > dropbear
diff dsa_import.c @ 3:7faae8f46238 libtomcrypt-orig
Branch renaming
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 31 May 2004 18:25:41 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/dsa_import.c Mon May 31 18:25:41 2004 +0000 @@ -0,0 +1,59 @@ +/* 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, [email protected], 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