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117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/* 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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#include "tomcrypt.h"
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/**
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@file dsa_export.c
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DSA implementation, export key, Tom St Denis
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*/
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#ifdef LTC_MDSA
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/**
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Export a DSA key to a binary packet
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@param out [out] Where to store the packet
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@param outlen [in/out] The max size and resulting size of the packet
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@param type The type of key to export (PK_PRIVATE or PK_PUBLIC)
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@param key The key to export
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@return CRYPT_OK if successful
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*/
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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 zero=0;
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int err, std;
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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LTC_ARGCHK(key != NULL);
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std = type & PK_STD;
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type &= ~PK_STD;
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/* can we store the static header? */
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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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if (type == PK_PRIVATE) {
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if (std) {
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return der_encode_sequence_multi(out, outlen,
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LTC_ASN1_SHORT_INTEGER, 1UL, &zero,
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LTC_ASN1_INTEGER, 1UL, key->p,
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LTC_ASN1_INTEGER, 1UL, key->q,
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LTC_ASN1_INTEGER, 1UL, key->g,
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LTC_ASN1_INTEGER, 1UL, key->y,
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LTC_ASN1_INTEGER, 1UL, key->x,
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LTC_ASN1_EOL, 0UL, NULL);
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}
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else {
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unsigned char flags[1];
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flags[0] = 1;
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return der_encode_sequence_multi(out, outlen,
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LTC_ASN1_BIT_STRING, 1UL, flags,
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LTC_ASN1_INTEGER, 1UL, key->g,
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LTC_ASN1_INTEGER, 1UL, key->p,
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LTC_ASN1_INTEGER, 1UL, key->q,
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LTC_ASN1_INTEGER, 1UL, key->y,
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LTC_ASN1_INTEGER, 1UL, key->x,
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LTC_ASN1_EOL, 0UL, NULL);
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}
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} else {
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if (std) {
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unsigned long tmplen = (unsigned long)(mp_count_bits(key->y) / 8) + 8;
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unsigned char* tmp = XMALLOC(tmplen);
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ltc_asn1_list int_list[3];
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if (tmp == NULL) {
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return CRYPT_MEM;
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}
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err = der_encode_integer(key->y, tmp, &tmplen);
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if (err != CRYPT_OK) {
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goto error;
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}
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LTC_SET_ASN1(int_list, 0, LTC_ASN1_INTEGER, key->p, 1UL);
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LTC_SET_ASN1(int_list, 1, LTC_ASN1_INTEGER, key->q, 1UL);
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LTC_SET_ASN1(int_list, 2, LTC_ASN1_INTEGER, key->g, 1UL);
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err = der_encode_subject_public_key_info(out, outlen, PKA_DSA, tmp,
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tmplen, LTC_ASN1_SEQUENCE, int_list,
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sizeof(int_list) / sizeof(int_list[0]));
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error:
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XFREE(tmp);
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return err;
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}
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else {
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unsigned char flags[1];
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flags[0] = 0;
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return der_encode_sequence_multi(out, outlen,
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LTC_ASN1_BIT_STRING, 1UL, flags,
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LTC_ASN1_INTEGER, 1UL, key->g,
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LTC_ASN1_INTEGER, 1UL, key->p,
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LTC_ASN1_INTEGER, 1UL, key->q,
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LTC_ASN1_INTEGER, 1UL, key->y,
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LTC_ASN1_EOL, 0UL, NULL);
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}
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}
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}
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#endif
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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