63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
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*/
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#include "mycrypt.h"
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#ifdef MDSA
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int dsa_export(unsigned char *out, unsigned long *outlen, int type, dsa_key *key)
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{
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unsigned long y, z;
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int err;
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_ARGCHK(out != NULL);
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_ARGCHK(outlen != NULL);
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_ARGCHK(key != NULL);
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/* can we store the static header? */
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if (*outlen < (PACKET_SIZE + 1 + 2)) {
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return CRYPT_BUFFER_OVERFLOW;
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}
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if (type == PK_PRIVATE && key->type != PK_PRIVATE) {
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return CRYPT_PK_TYPE_MISMATCH;
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}
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if (type != PK_PUBLIC && type != PK_PRIVATE) {
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return CRYPT_INVALID_ARG;
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}
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/* store header */
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packet_store_header(out, PACKET_SECT_DSA, PACKET_SUB_KEY);
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y = PACKET_SIZE;
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/* store g, p, q, qord */
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out[y++] = type;
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out[y++] = (key->qord>>8)&255;
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out[y++] = key->qord & 255;
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OUTPUT_BIGNUM(&key->g,out,y,z);
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OUTPUT_BIGNUM(&key->p,out,y,z);
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OUTPUT_BIGNUM(&key->q,out,y,z);
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/* public exponent */
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OUTPUT_BIGNUM(&key->y,out,y,z);
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if (type == PK_PRIVATE) {
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OUTPUT_BIGNUM(&key->x,out,y,z);
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}
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*outlen = y;
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return CRYPT_OK;
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}
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#endif
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