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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 |
