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annotate dsa_export.c @ 18:712dd6dfb0eb libtomcrypt

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makefile
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Jun 2004 14:34:07 +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_export(unsigned char *out, unsigned long *outlen, int type, dsa_key *key)
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16 {
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17 unsigned long y, z;
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18 int err;
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19
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20 _ARGCHK(out != NULL);
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21 _ARGCHK(outlen != NULL);
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22 _ARGCHK(key != NULL);
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23
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24 /* can we store the static header? */
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25 if (*outlen < (PACKET_SIZE + 1 + 2)) {
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26 return CRYPT_BUFFER_OVERFLOW;
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27 }
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28
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29 if (type == PK_PRIVATE && key->type != PK_PRIVATE) {
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30 return CRYPT_PK_TYPE_MISMATCH;
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31 }
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32
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33 if (type != PK_PUBLIC && type != PK_PRIVATE) {
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34 return CRYPT_INVALID_ARG;
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35 }
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36
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37 /* store header */
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38 packet_store_header(out, PACKET_SECT_DSA, PACKET_SUB_KEY);
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39 y = PACKET_SIZE;
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40
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41 /* store g, p, q, qord */
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42 out[y++] = type;
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43 out[y++] = (key->qord>>8)&255;
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44 out[y++] = key->qord & 255;
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45
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46 OUTPUT_BIGNUM(&key->g,out,y,z);
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47 OUTPUT_BIGNUM(&key->p,out,y,z);
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48 OUTPUT_BIGNUM(&key->q,out,y,z);
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49
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50 /* public exponent */
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51 OUTPUT_BIGNUM(&key->y,out,y,z);
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52
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53 if (type == PK_PRIVATE) {
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54 OUTPUT_BIGNUM(&key->x,out,y,z);
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55 }
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56
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57 *outlen = y;
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58 return CRYPT_OK;
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59 }
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60
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61 #endif
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62