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annotate dsa_import.c @ 16:09ab3354aa21 libtomcrypt

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propagate of e8bea23df30f9f46c647d06db3b223427b4e3604 and b0b6b4a8843b94d9f049cb5ffe0b1ae91ec1bf8b from branch 'au.asn.ucc.matt.ltc-orig' to 'au.asn.ucc.matt.ltc-db'
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Jun 2004 14:27:14 +0000
parents d7da3b1e1540
children
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11 #include "mycrypt.h"
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12
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13 #ifdef MDSA
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14
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15 int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key)
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16 {
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17 unsigned long x, y;
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18 int err;
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19
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20 _ARGCHK(in != NULL);
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21 _ARGCHK(key != NULL);
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22
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23 /* check length */
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24 if ((1+2+PACKET_SIZE) > inlen) {
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25 return CRYPT_INVALID_PACKET;
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26 }
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27
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28 /* check type */
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29 if ((err = packet_valid_header((unsigned char *)in, PACKET_SECT_DSA, PACKET_SUB_KEY)) != CRYPT_OK) {
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30 return err;
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31 }
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32 y = PACKET_SIZE;
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33
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34 /* init key */
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35 if (mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL) != MP_OKAY) {
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36 return CRYPT_MEM;
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37 }
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38
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39 /* read type/qord */
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40 key->type = in[y++];
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41 key->qord = ((unsigned)in[y]<<8)|((unsigned)in[y+1]);
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42 y += 2;
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43
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44 /* input publics */
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45 INPUT_BIGNUM(&key->g,in,x,y, inlen);
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46 INPUT_BIGNUM(&key->p,in,x,y, inlen);
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47 INPUT_BIGNUM(&key->q,in,x,y, inlen);
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48 INPUT_BIGNUM(&key->y,in,x,y, inlen);
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49 if (key->type == PK_PRIVATE) {
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50 INPUT_BIGNUM(&key->x,in,x,y, inlen);
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51 }
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52
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53 return CRYPT_OK;
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54 error:
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55 mp_clear_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL);
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56 return err;
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57 }
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58
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59 #endif