release/src/router/nettle/dsa.h

   1 /* dsa.h
   2  *
   3  * The DSA publickey algorithm.
   4  */
   5
   6 /* nettle, low-level cryptographics library
   7  *
   8  * Copyright (C) 2002 Niels Möller
   9  *
  10  * The nettle library is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or (at your
  13  * option) any later version.
  14  *
  15  * The nettle library is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  18  * License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  23  * MA 02111-1301, USA.
  24  */
  25
  26 #ifndef NETTLE_DSA_H_INCLUDED
  27 #define NETTLE_DSA_H_INCLUDED
  28
  29 #include <gmp.h>
  30
  31 #include "nettle-types.h"
  32
  33 #include "sha1.h"
  34 #include "sha2.h"
  35
  36 #ifdef __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 /* Name mangling */
  41 #define dsa_public_key_init nettle_dsa_public_key_init
  42 #define dsa_public_key_clear nettle_dsa_public_key_clear
  43 #define dsa_private_key_init nettle_dsa_private_key_init
  44 #define dsa_private_key_clear nettle_dsa_private_key_clear
  45 #define dsa_signature_init nettle_dsa_signature_init
  46 #define dsa_signature_clear nettle_dsa_signature_clear
  47 #define dsa_sha1_sign nettle_dsa_sha1_sign
  48 #define dsa_sha1_verify nettle_dsa_sha1_verify
  49 #define dsa_sha256_sign nettle_dsa_sha256_sign
  50 #define dsa_sha256_verify nettle_dsa_sha256_verify
  51 #define dsa_sha1_sign_digest nettle_dsa_sha1_sign_digest
  52 #define dsa_sha1_verify_digest nettle_dsa_sha1_verify_digest
  53 #define dsa_sha256_sign_digest nettle_dsa_sha256_sign_digest
  54 #define dsa_sha256_verify_digest nettle_dsa_sha256_verify_digest
  55 #define dsa_generate_keypair nettle_dsa_generate_keypair
  56 #define dsa_signature_from_sexp nettle_dsa_signature_from_sexp
  57 #define dsa_keypair_to_sexp nettle_dsa_keypair_to_sexp
  58 #define dsa_keypair_from_sexp_alist nettle_dsa_keypair_from_sexp_alist
  59 #define dsa_sha1_keypair_from_sexp nettle_dsa_sha1_keypair_from_sexp
  60 #define dsa_sha256_keypair_from_sexp nettle_dsa_sha256_keypair_from_sexp
  61 #define dsa_params_from_der_iterator nettle_dsa_params_from_der_iterator
  62 #define dsa_public_key_from_der_iterator nettle_dsa_public_key_from_der_iterator
  63 #define dsa_openssl_private_key_from_der_iterator nettle_dsa_openssl_private_key_from_der_iterator
  64 #define dsa_openssl_private_key_from_der nettle_openssl_provate_key_from_der
  65 #define _dsa_sign _nettle_dsa_sign
  66 #define _dsa_verify _nettle_dsa_verify
  67
  68 #define DSA_SHA1_MIN_P_BITS 512
  69 #define DSA_SHA1_Q_OCTETS 20
  70 #define DSA_SHA1_Q_BITS 160
  71
  72 #define DSA_SHA256_MIN_P_BITS 1024
  73 #define DSA_SHA256_Q_OCTETS 32
  74 #define DSA_SHA256_Q_BITS 256
  75
  76 struct dsa_public_key
  77 {
  78   /* Modulo */
  79   mpz_t p;
  80
  81   /* Group order */
  82   mpz_t q;
  83
  84   /* Generator */
  85   mpz_t g;
  86
  87   /* Public value */
  88   mpz_t y;
  89 };
  90
  91 struct dsa_private_key
  92 {
  93   /* Unlike an rsa public key, private key operations will need both
  94    * the private and the public information. */
  95   mpz_t x;
  96 };
  97
  98 struct dsa_signature
  99 {
 100   mpz_t r;
 101   mpz_t s;
 102 };
 103
 104 /* Signing a message works as follows:
 105  *
 106  * Store the private key in a dsa_private_key struct.
 107  *
 108  * Initialize a hashing context, by callling
 109  *   sha1_init
 110  *
 111  * Hash the message by calling
 112  *   sha1_update
 113  *
 114  * Create the signature by calling
 115  *   dsa_sha1_sign
 116  *
 117  * The signature is represented as a struct dsa_signature. This call also
 118  * resets the hashing context.
 119  *
 120  * When done with the key and signature, don't forget to call
 121  * dsa_signature_clear.
 122  */
 123
 124 /* Calls mpz_init to initialize bignum storage. */
 125 void
 126 dsa_public_key_init(struct dsa_public_key *key);
 127
 128 /* Calls mpz_clear to deallocate bignum storage. */
 129 void
 130 dsa_public_key_clear(struct dsa_public_key *key);
 131
 132
 133 /* Calls mpz_init to initialize bignum storage. */
 134 void
 135 dsa_private_key_init(struct dsa_private_key *key);
 136
 137 /* Calls mpz_clear to deallocate bignum storage. */
 138 void
 139 dsa_private_key_clear(struct dsa_private_key *key);
 140
 141 /* Calls mpz_init to initialize bignum storage. */
 142 void
 143 dsa_signature_init(struct dsa_signature *signature);
 144
 145 /* Calls mpz_clear to deallocate bignum storage. */
 146 void
 147 dsa_signature_clear(struct dsa_signature *signature);
 148
 149
 150 int
 151 dsa_sha1_sign(const struct dsa_public_key *pub,
 152               const struct dsa_private_key *key,
 153               void *random_ctx, nettle_random_func *random,
 154               struct sha1_ctx *hash,
 155               struct dsa_signature *signature);
 156
 157 int
 158 dsa_sha256_sign(const struct dsa_public_key *pub,
 159                 const struct dsa_private_key *key,
 160                 void *random_ctx, nettle_random_func *random,
 161                 struct sha256_ctx *hash,
 162                 struct dsa_signature *signature);
 163
 164 int
 165 dsa_sha1_verify(const struct dsa_public_key *key,
 166                 struct sha1_ctx *hash,
 167                 const struct dsa_signature *signature);
 168
 169 int
 170 dsa_sha256_verify(const struct dsa_public_key *key,
 171                   struct sha256_ctx *hash,
 172                   const struct dsa_signature *signature);
 173
 174 int
 175 dsa_sha1_sign_digest(const struct dsa_public_key *pub,
 176                      const struct dsa_private_key *key,
 177                      void *random_ctx, nettle_random_func *random,
 178                      const uint8_t *digest,
 179                      struct dsa_signature *signature);
 180 int
 181 dsa_sha256_sign_digest(const struct dsa_public_key *pub,
 182                        const struct dsa_private_key *key,
 183                        void *random_ctx, nettle_random_func *random,
 184                        const uint8_t *digest,
 185                        struct dsa_signature *signature);
 186
 187 int
 188 dsa_sha1_verify_digest(const struct dsa_public_key *key,
 189                        const uint8_t *digest,
 190                        const struct dsa_signature *signature);
 191
 192 int
 193 dsa_sha256_verify_digest(const struct dsa_public_key *key,
 194                          const uint8_t *digest,
 195                          const struct dsa_signature *signature);
 196
 197 /* Key generation */
 198
 199 int
 200 dsa_generate_keypair(struct dsa_public_key *pub,
 201                      struct dsa_private_key *key,
 202
 203                      void *random_ctx, nettle_random_func *random,
 204
 205                      void *progress_ctx, nettle_progress_func *progress,
 206                      unsigned p_bits, unsigned q_bits);
 207
 208 /* Keys in sexp form. */
 209
 210 struct nettle_buffer;
 211
 212 /* Generates a public-key expression if PRIV is NULL .*/
 213 int
 214 dsa_keypair_to_sexp(struct nettle_buffer *buffer,
 215                     const char *algorithm_name, /* NULL means "dsa" */
 216                     const struct dsa_public_key *pub,
 217                     const struct dsa_private_key *priv);
 218
 219 struct sexp_iterator;
 220
 221 int
 222 dsa_signature_from_sexp(struct dsa_signature *rs,
 223                         struct sexp_iterator *i,
 224                         unsigned q_bits);
 225
 226 int
 227 dsa_keypair_from_sexp_alist(struct dsa_public_key *pub,
 228                             struct dsa_private_key *priv,
 229                             unsigned p_max_bits,
 230                             unsigned q_bits,
 231                             struct sexp_iterator *i);
 232
 233 /* If PRIV is NULL, expect a public-key expression. If PUB is NULL,
 234  * expect a private key expression and ignore the parts not needed for
 235  * the public key. */
 236 /* Keys must be initialized before calling this function, as usual. */
 237 int
 238 dsa_sha1_keypair_from_sexp(struct dsa_public_key *pub,
 239                            struct dsa_private_key *priv,
 240                            unsigned p_max_bits,
 241                            unsigned length, const uint8_t *expr);
 242
 243 int
 244 dsa_sha256_keypair_from_sexp(struct dsa_public_key *pub,
 245                              struct dsa_private_key *priv,
 246                              unsigned p_max_bits,
 247                              unsigned length, const uint8_t *expr);
 248
 249 /* Keys in X.509 andd OpenSSL format. */
 250 struct asn1_der_iterator;
 251
 252 int
 253 dsa_params_from_der_iterator(struct dsa_public_key *pub,
 254                              unsigned p_max_bits,
 255                              struct asn1_der_iterator *i);
 256 int
 257 dsa_public_key_from_der_iterator(struct dsa_public_key *pub,
 258                                  unsigned p_max_bits,
 259                                  struct asn1_der_iterator *i);
 260
 261 int
 262 dsa_openssl_private_key_from_der_iterator(struct dsa_public_key *pub,
 263                                           struct dsa_private_key *priv,
 264                                           unsigned p_max_bits,
 265                                           struct asn1_der_iterator *i);
 266
 267 int
 268 dsa_openssl_private_key_from_der(struct dsa_public_key *pub,
 269                                  struct dsa_private_key *priv,
 270                                  unsigned p_max_bits,
 271                                  unsigned length, const uint8_t *data);
 272
 273
 274 /* Internal functions. */
 275 int
 276 _dsa_sign(const struct dsa_public_key *pub,
 277           const struct dsa_private_key *key,
 278           void *random_ctx, nettle_random_func *random,
 279           unsigned digest_size,
 280           const uint8_t *digest,
 281           struct dsa_signature *signature);
 282
 283 int
 284 _dsa_verify(const struct dsa_public_key *key,
 285             unsigned digest_size,
 286             const uint8_t *digest,
 287             const struct dsa_signature *signature);
 288
 289 #ifdef __cplusplus
 290 }
 291 #endif
 292
 293 #endif /* NETTLE_DSA_H_INCLUDED */