Mercurial > dropbear

annotate src/pk/dsa/dsa_import.c @ 192:9cc34777b479 libtomcrypt

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propagate from branch 'au.asn.ucc.matt.ltc-orig' (head 9ba8f01f44320e9cb9f19881105ae84f84a43ea9) to branch 'au.asn.ucc.matt.dropbear.ltc' (head dbf51c569bc34956ad948e4cc87a0eeb2170b768)
author Matt Johnston <matt@ucc.asn.au>
date Sun, 08 May 2005 06:36:47 +0000
parents 1c15b283127b
children 39d5d58461d6
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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 "tomcrypt.h"
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12
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13 /**
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14 @file dsa_import.c
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15 DSA implementation, import a DSA key, Tom St Denis
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16 */
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17
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18 #ifdef MDSA
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19
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20 /**
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21 Import a DSA key
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22 @param in The binary packet to import from
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23 @param inlen The length of the binary packet
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24 @param key [out] Where to store the imported key
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25 @return CRYPT_OK if successful, upon error this function will free all allocated memory
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26 */
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27 int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key)
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28 {
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29 unsigned long x, y;
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30 int err;
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31
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32 LTC_ARGCHK(in != NULL);
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33 LTC_ARGCHK(key != NULL);
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34
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35 /* check length */
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36 if ((1+2+PACKET_SIZE) > inlen) {
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37 return CRYPT_INVALID_PACKET;
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38 }
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39
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40 /* check type */
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41 if ((err = packet_valid_header((unsigned char *)in, PACKET_SECT_DSA, PACKET_SUB_KEY)) != CRYPT_OK) {
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42 return err;
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43 }
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44 y = PACKET_SIZE;
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45
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46 /* init key */
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47 if (mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL) != MP_OKAY) {
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48 return CRYPT_MEM;
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49 }
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50
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51 /* read type/qord */
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52 key->type = in[y++];
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53 key->qord = ((unsigned)in[y]<<8)|((unsigned)in[y+1]);
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54 y += 2;
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55
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56 /* input publics */
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57 INPUT_BIGNUM(&key->g,in,x,y, inlen);
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58 INPUT_BIGNUM(&key->p,in,x,y, inlen);
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59 INPUT_BIGNUM(&key->q,in,x,y, inlen);
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60 INPUT_BIGNUM(&key->y,in,x,y, inlen);
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61 if (key->type == PK_PRIVATE) {
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62 INPUT_BIGNUM(&key->x,in,x,y, inlen);
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63 }
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64
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65 return CRYPT_OK;
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66 error:
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67 mp_clear_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL);
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68 return err;
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69 }
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70
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71 #endif