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annotate src/pk/dsa/dsa_export.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
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children 39d5d58461d6
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191
1c15b283127b Import of libtomcrypt 1.02 with manual path rename rearrangement etc
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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_export.c
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15 DSA implementation, export 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 Export a DSA key to a binary packet
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22 @param out [out] Where to store the packet
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23 @param outlen [in/out] The max size and resulting size of the packet
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24 @param type The type of key to export (PK_PRIVATE or PK_PUBLIC)
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25 @param key The key to export
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26 @return CRYPT_OK if successful
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27 */
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28 int dsa_export(unsigned char *out, unsigned long *outlen, int type, dsa_key *key)
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29 {
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30 unsigned long y, z;
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31 int err;
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32
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33 LTC_ARGCHK(out != NULL);
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34 LTC_ARGCHK(outlen != NULL);
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35 LTC_ARGCHK(key != NULL);
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36
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37 /* can we store the static header? */
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38 if (*outlen < (PACKET_SIZE + 1 + 2)) {
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39 return CRYPT_BUFFER_OVERFLOW;
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40 }
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41
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42 if (type == PK_PRIVATE && key->type != PK_PRIVATE) {
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43 return CRYPT_PK_TYPE_MISMATCH;
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44 }
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45
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46 if (type != PK_PUBLIC && type != PK_PRIVATE) {
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47 return CRYPT_INVALID_ARG;
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48 }
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49
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50 /* store header */
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51 packet_store_header(out, PACKET_SECT_DSA, PACKET_SUB_KEY);
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52 y = PACKET_SIZE;
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53
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54 /* store g, p, q, qord */
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55 out[y++] = type;
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56 out[y++] = (key->qord>>8)&255;
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57 out[y++] = key->qord & 255;
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58
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59 OUTPUT_BIGNUM(&key->g,out,y,z);
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60 OUTPUT_BIGNUM(&key->p,out,y,z);
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61 OUTPUT_BIGNUM(&key->q,out,y,z);
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62
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63 /* public exponent */
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64 OUTPUT_BIGNUM(&key->y,out,y,z);
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65
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66 if (type == PK_PRIVATE) {
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67 OUTPUT_BIGNUM(&key->x,out,y,z);
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68 }
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69
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70 *outlen = y;
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71 return CRYPT_OK;
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72 }
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73
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74 #endif
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75