Mercurial > dropbear

annotate libtomcrypt/src/pk/dsa/dsa_export.c @ 902:2351b2da8e0d DROPBEAR_2014.63

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2014.63
author Matt Johnston <matt@ucc.asn.au>
date Wed, 19 Feb 2014 22:04:35 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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.com
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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 char flags[1];
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31
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32 LTC_ARGCHK(out != NULL);
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33 LTC_ARGCHK(outlen != NULL);
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34 LTC_ARGCHK(key != NULL);
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35
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36 /* can we store the static header? */
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37 if (type == PK_PRIVATE && key->type != PK_PRIVATE) {
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38 return CRYPT_PK_TYPE_MISMATCH;
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39 }
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41 if (type != PK_PUBLIC && type != PK_PRIVATE) {
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42 return CRYPT_INVALID_ARG;
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43 }
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45 flags[0] = (type != PK_PUBLIC) ? 1 : 0;
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47 if (type == PK_PRIVATE) {
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48 return der_encode_sequence_multi(out, outlen,
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49 LTC_ASN1_BIT_STRING, 1UL, flags,
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50 LTC_ASN1_INTEGER, 1UL, key->g,
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51 LTC_ASN1_INTEGER, 1UL, key->p,
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52 LTC_ASN1_INTEGER, 1UL, key->q,
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53 LTC_ASN1_INTEGER, 1UL, key->y,
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54 LTC_ASN1_INTEGER, 1UL, key->x,
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55 LTC_ASN1_EOL, 0UL, NULL);
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56 } else {
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57 return der_encode_sequence_multi(out, outlen,
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58 LTC_ASN1_BIT_STRING, 1UL, flags,
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59 LTC_ASN1_INTEGER, 1UL, key->g,
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60 LTC_ASN1_INTEGER, 1UL, key->p,
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61 LTC_ASN1_INTEGER, 1UL, key->q,
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62 LTC_ASN1_INTEGER, 1UL, key->y,
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63 LTC_ASN1_EOL, 0UL, NULL);
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64 }
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65 }
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66
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67 #endif
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68
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69
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70 /* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_export.c,v $ */
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71 /* $Revision: 1.8 $ */
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72 /* $Date: 2006/03/31 14:15:35 $ */