+
−/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+
− *
+
− * LibTomCrypt is a library that provides various cryptographic
+
− * algorithms in a highly modular and flexible manner.
+
− *
+
− * The library is free for all purposes without any express
+
− * guarantee it works.
+
− */
+
−#include "tomcrypt.h"
+
−
+
−/**
+
−   @file dsa_export.c
+
−   DSA implementation, export key, Tom St Denis
+
−*/
+
−
+
−#ifdef LTC_MDSA
+
−
+
−/**
+
−  Export a DSA key to a binary packet
+
−  @param out    [out] Where to store the packet
+
−  @param outlen [in/out] The max size and resulting size of the packet
+
−  @param type   The type of key to export (PK_PRIVATE or PK_PUBLIC)
+
−  @param key    The key to export
+
−  @return CRYPT_OK if successful
+
−*/
+
−int dsa_export(unsigned char *out, unsigned long *outlen, int type, dsa_key *key)
+
−{
+
−   unsigned long zero=0;
+
−   int err, std;
+
−
+
−   LTC_ARGCHK(out    != NULL);
+
−   LTC_ARGCHK(outlen != NULL);
+
−   LTC_ARGCHK(key    != NULL);
+
−
+
−   std = type & PK_STD;
+
−   type &= ~PK_STD;
+
−
+
−   /* can we store the static header?  */
+
−   if (type == PK_PRIVATE && key->type != PK_PRIVATE) {
+
−      return CRYPT_PK_TYPE_MISMATCH;
+
−   }
+
−
+
−   if (type != PK_PUBLIC && type != PK_PRIVATE) {
+
−      return CRYPT_INVALID_ARG;
+
−   }
+
−
+
−   if (type == PK_PRIVATE) {
+
−      if (std) {
+
−          return der_encode_sequence_multi(out, outlen,
+
−                                         LTC_ASN1_SHORT_INTEGER, 1UL, &zero,
+
−                                         LTC_ASN1_INTEGER,      1UL, key->p,
+
−                                         LTC_ASN1_INTEGER,      1UL, key->q,
+
−                                         LTC_ASN1_INTEGER,      1UL, key->g,
+
−                                         LTC_ASN1_INTEGER,      1UL, key->y,
+
−                                         LTC_ASN1_INTEGER,      1UL, key->x,
+
−                                         LTC_ASN1_EOL,          0UL, NULL);
+
−      }
+
−      else {
+
−          unsigned char flags[1];
+
−          flags[0] = 1;
+
−          return der_encode_sequence_multi(out, outlen,
+
−                                         LTC_ASN1_BIT_STRING,   1UL, flags,
+
−                                         LTC_ASN1_INTEGER,      1UL, key->g,
+
−                                         LTC_ASN1_INTEGER,      1UL, key->p,
+
−                                         LTC_ASN1_INTEGER,      1UL, key->q,
+
−                                         LTC_ASN1_INTEGER,      1UL, key->y,
+
−                                         LTC_ASN1_INTEGER,      1UL, key->x,
+
−                                         LTC_ASN1_EOL,          0UL, NULL);
+
−      }
+
−   } else {
+
−      if (std) {
+
−          unsigned long tmplen = (unsigned long)(mp_count_bits(key->y) / 8) + 8;
+
−          unsigned char* tmp = XMALLOC(tmplen);
+
−          ltc_asn1_list int_list[3];
+
−
+
−          if (tmp == NULL) {
+
−              return CRYPT_MEM;
+
−          }
+
−
+
−          err = der_encode_integer(key->y, tmp, &tmplen);
+
−          if (err != CRYPT_OK) {
+
−              goto error;
+
−          }
+
−
+
−          LTC_SET_ASN1(int_list, 0, LTC_ASN1_INTEGER, key->p, 1UL);
+
−          LTC_SET_ASN1(int_list, 1, LTC_ASN1_INTEGER, key->q, 1UL);
+
−          LTC_SET_ASN1(int_list, 2, LTC_ASN1_INTEGER, key->g, 1UL);
+
−
+
−          err = der_encode_subject_public_key_info(out, outlen, PKA_DSA, tmp,
+
−              tmplen, LTC_ASN1_SEQUENCE, int_list,
+
−              sizeof(int_list) / sizeof(int_list[0]));
+
−
+
−error:
+
−          XFREE(tmp);
+
−          return err;
+
−      }
+
−      else {
+
−          unsigned char flags[1];
+
−          flags[0] = 0;
+
−          return der_encode_sequence_multi(out, outlen,
+
−                                     LTC_ASN1_BIT_STRING,   1UL, flags,
+
−                                     LTC_ASN1_INTEGER,      1UL, key->g,
+
−                                     LTC_ASN1_INTEGER,      1UL, key->p,
+
−                                     LTC_ASN1_INTEGER,      1UL, key->q,
+
−                                     LTC_ASN1_INTEGER,      1UL, key->y,
+
−                                     LTC_ASN1_EOL,          0UL, NULL);
+
−      }
+
−   }
+
−}
+
−
+
−#endif
+
−
+
−
+
−/* ref:         $Format:%D$ */
+
−/* git commit:  $Format:%H$ */
+
−/* commit time: $Format:%ai$ */