include/openssl/dsa.h

   1 /* crypto/dsa/dsa.h */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 /*
  60  * The DSS routines are based on patches supplied by
  61  * Steven Schoch <schoch@sheba.arc.nasa.gov>.
  62  */
  63
  64 #ifndef HEADER_DSA_H
  65 # define HEADER_DSA_H
  66
  67 # include <openssl/e_os2.h>
  68
  69 # ifdef OPENSSL_NO_DSA
  70 #  error DSA is disabled.
  71 # endif
  72
  73 # include <openssl/bio.h>
  74 # include <openssl/crypto.h>
  75 # include <openssl/ossl_typ.h>
  76 # include <openssl/opensslconf.h>
  77
  78 # if OPENSSL_API_COMPAT < 0x10100000L
  79 #  include <openssl/bn.h>
  80 #  ifndef OPENSSL_NO_DH
  81 #   include <openssl/dh.h>
  82 #  endif
  83 # endif
  84
  85 # ifndef OPENSSL_DSA_MAX_MODULUS_BITS
  86 #  define OPENSSL_DSA_MAX_MODULUS_BITS   10000
  87 # endif
  88
  89 # define OPENSSL_DSA_FIPS_MIN_MODULUS_BITS 1024
  90
  91 # define DSA_FLAG_CACHE_MONT_P   0x01
  92 /*
  93  * new with 0.9.7h; the built-in DSA implementation now uses constant time
  94  * modular exponentiation for secret exponents by default. This flag causes
  95  * the faster variable sliding window method to be used for all exponents.
  96  */
  97 # define DSA_FLAG_NO_EXP_CONSTTIME       0x02
  98
  99 /*
 100  * If this flag is set the DSA method is FIPS compliant and can be used in
 101  * FIPS mode. This is set in the validated module method. If an application
 102  * sets this flag in its own methods it is its reposibility to ensure the
 103  * result is compliant.
 104  */
 105
 106 # define DSA_FLAG_FIPS_METHOD                    0x0400
 107
 108 /*
 109  * If this flag is set the operations normally disabled in FIPS mode are
 110  * permitted it is then the applications responsibility to ensure that the
 111  * usage is compliant.
 112  */
 113
 114 # define DSA_FLAG_NON_FIPS_ALLOW                 0x0400
 115 # define DSA_FLAG_FIPS_CHECKED                   0x0800
 116
 117 #ifdef  __cplusplus
 118 extern "C" {
 119 #endif
 120
 121 /* Already defined in ossl_typ.h */
 122 /* typedef struct dsa_st DSA; */
 123 /* typedef struct dsa_method DSA_METHOD; */
 124
 125 typedef struct DSA_SIG_st {
 126     BIGNUM *r;
 127     BIGNUM *s;
 128 } DSA_SIG;
 129
 130 struct dsa_method {
 131     const char *name;
 132     DSA_SIG *(*dsa_do_sign) (const unsigned char *dgst, int dlen, DSA *dsa);
 133     int (*dsa_sign_setup) (DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
 134                            BIGNUM **rp);
 135     int (*dsa_do_verify) (const unsigned char *dgst, int dgst_len,
 136                           DSA_SIG *sig, DSA *dsa);
 137     int (*dsa_mod_exp) (DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
 138                         BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
 139                         BN_MONT_CTX *in_mont);
 140     /* Can be null */
 141     int (*bn_mod_exp) (DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
 142                        const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
 143     int (*init) (DSA *dsa);
 144     int (*finish) (DSA *dsa);
 145     int flags;
 146     char *app_data;
 147     /* If this is non-NULL, it is used to generate DSA parameters */
 148     int (*dsa_paramgen) (DSA *dsa, int bits,
 149                          const unsigned char *seed, int seed_len,
 150                          int *counter_ret, unsigned long *h_ret,
 151                          BN_GENCB *cb);
 152     /* If this is non-NULL, it is used to generate DSA keys */
 153     int (*dsa_keygen) (DSA *dsa);
 154 };
 155
 156 struct dsa_st {
 157     /*
 158      * This first variable is used to pick up errors where a DSA is passed
 159      * instead of of a EVP_PKEY
 160      */
 161     int pad;
 162     long version;
 163     BIGNUM *p;
 164     BIGNUM *q;                  /* == 20 */
 165     BIGNUM *g;
 166     BIGNUM *pub_key;            /* y public key */
 167     BIGNUM *priv_key;           /* x private key */
 168     BIGNUM *kinv;               /* Signing pre-calc */
 169     BIGNUM *r;                  /* Signing pre-calc */
 170     int flags;
 171     /* Normally used to cache montgomery values */
 172     BN_MONT_CTX *method_mont_p;
 173     int references;
 174     CRYPTO_EX_DATA ex_data;
 175     const DSA_METHOD *meth;
 176     /* functional reference if 'meth' is ENGINE-provided */
 177     ENGINE *engine;
 178 };
 179
 180 # define d2i_DSAparams_fp(fp,x) (DSA *)ASN1_d2i_fp((char *(*)())DSA_new, \
 181                 (char *(*)())d2i_DSAparams,(fp),(unsigned char **)(x))
 182 # define i2d_DSAparams_fp(fp,x) ASN1_i2d_fp(i2d_DSAparams,(fp), \
 183                 (unsigned char *)(x))
 184 # define d2i_DSAparams_bio(bp,x) ASN1_d2i_bio_of(DSA,DSA_new,d2i_DSAparams,bp,x)
 185 # define i2d_DSAparams_bio(bp,x) ASN1_i2d_bio_of_const(DSA,i2d_DSAparams,bp,x)
 186
 187 DSA *DSAparams_dup(DSA *x);
 188 DSA_SIG *DSA_SIG_new(void);
 189 void DSA_SIG_free(DSA_SIG *a);
 190 int i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
 191 DSA_SIG *d2i_DSA_SIG(DSA_SIG **v, const unsigned char **pp, long length);
 192
 193 DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
 194 int DSA_do_verify(const unsigned char *dgst, int dgst_len,
 195                   DSA_SIG *sig, DSA *dsa);
 196
 197 const DSA_METHOD *DSA_OpenSSL(void);
 198
 199 void DSA_set_default_method(const DSA_METHOD *);
 200 const DSA_METHOD *DSA_get_default_method(void);
 201 int DSA_set_method(DSA *dsa, const DSA_METHOD *);
 202
 203 DSA *DSA_new(void);
 204 DSA *DSA_new_method(ENGINE *engine);
 205 void DSA_free(DSA *r);
 206 /* "up" the DSA object's reference count */
 207 int DSA_up_ref(DSA *r);
 208 int DSA_size(const DSA *);
 209 int DSA_security_bits(const DSA *d);
 210         /* next 4 return -1 on error */
 211 int DSA_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp);
 212 int DSA_sign(int type, const unsigned char *dgst, int dlen,
 213              unsigned char *sig, unsigned int *siglen, DSA *dsa);
 214 int DSA_verify(int type, const unsigned char *dgst, int dgst_len,
 215                const unsigned char *sigbuf, int siglen, DSA *dsa);
 216 #define DSA_get_ex_new_index(l, p, newf, dupf, freef) \
 217     CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, l, p, newf, dupf, freef)
 218 int DSA_set_ex_data(DSA *d, int idx, void *arg);
 219 void *DSA_get_ex_data(DSA *d, int idx);
 220
 221 DSA *d2i_DSAPublicKey(DSA **a, const unsigned char **pp, long length);
 222 DSA *d2i_DSAPrivateKey(DSA **a, const unsigned char **pp, long length);
 223 DSA *d2i_DSAparams(DSA **a, const unsigned char **pp, long length);
 224
 225 /* Deprecated version */
 226 DEPRECATEDIN_0_9_8(DSA *DSA_generate_parameters(int bits,
 227                                                 unsigned char *seed,
 228                                                 int seed_len,
 229                                                 int *counter_ret,
 230                                                 unsigned long *h_ret, void
 231                                                  (*callback) (int, int,
 232                                                               void *),
 233                                                 void *cb_arg))
 234
 235 /* New version */
 236 int DSA_generate_parameters_ex(DSA *dsa, int bits,
 237                                const unsigned char *seed, int seed_len,
 238                                int *counter_ret, unsigned long *h_ret,
 239                                BN_GENCB *cb);
 240
 241 int DSA_generate_key(DSA *a);
 242 int i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
 243 int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
 244 int i2d_DSAparams(const DSA *a, unsigned char **pp);
 245
 246 int DSAparams_print(BIO *bp, const DSA *x);
 247 int DSA_print(BIO *bp, const DSA *x, int off);
 248 # ifndef OPENSSL_NO_STDIO
 249 int DSAparams_print_fp(FILE *fp, const DSA *x);
 250 int DSA_print_fp(FILE *bp, const DSA *x, int off);
 251 # endif
 252
 253 # define DSS_prime_checks 50
 254 /*
 255  * Primality test according to FIPS PUB 186[-1], Appendix 2.1: 50 rounds of
 256  * Rabin-Miller
 257  */
 258 # define DSA_is_prime(n, callback, cb_arg) \
 259         BN_is_prime(n, DSS_prime_checks, callback, NULL, cb_arg)
 260
 261 # ifndef OPENSSL_NO_DH
 262 /*
 263  * Convert DSA structure (key or just parameters) into DH structure (be
 264  * careful to avoid small subgroup attacks when using this!)
 265  */
 266 DH *DSA_dup_DH(const DSA *r);
 267 # endif
 268
 269 # define EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits) \
 270         EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN, \
 271                                 EVP_PKEY_CTRL_DSA_PARAMGEN_BITS, nbits, NULL)
 272
 273 # define EVP_PKEY_CTRL_DSA_PARAMGEN_BITS         (EVP_PKEY_ALG_CTRL + 1)
 274 # define EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS       (EVP_PKEY_ALG_CTRL + 2)
 275 # define EVP_PKEY_CTRL_DSA_PARAMGEN_MD           (EVP_PKEY_ALG_CTRL + 3)
 276
 277 /* BEGIN ERROR CODES */
 278 /*
 279  * The following lines are auto generated by the script mkerr.pl. Any changes
 280  * made after this point may be overwritten when the script is next run.
 281  */
 282 void ERR_load_DSA_strings(void);
 283
 284 /* Error codes for the DSA functions. */
 285
 286 /* Function codes. */
 287 # define DSA_F_D2I_DSA_SIG                                110
 288 # define DSA_F_DO_DSA_PRINT                               104
 289 # define DSA_F_DSAPARAMS_PRINT                            100
 290 # define DSA_F_DSAPARAMS_PRINT_FP                         101
 291 # define DSA_F_DSA_BUILTIN_KEYGEN                         124
 292 # define DSA_F_DSA_BUILTIN_PARAMGEN                       125
 293 # define DSA_F_DSA_BUILTIN_PARAMGEN2                      126
 294 # define DSA_F_DSA_DO_SIGN                                112
 295 # define DSA_F_DSA_DO_VERIFY                              113
 296 # define DSA_F_DSA_NEW_METHOD                             103
 297 # define DSA_F_DSA_PARAM_DECODE                           119
 298 # define DSA_F_DSA_PRINT_FP                               105
 299 # define DSA_F_DSA_PRIV_DECODE                            115
 300 # define DSA_F_DSA_PRIV_ENCODE                            116
 301 # define DSA_F_DSA_PUB_DECODE                             117
 302 # define DSA_F_DSA_PUB_ENCODE                             118
 303 # define DSA_F_DSA_SIGN                                   106
 304 # define DSA_F_DSA_SIGN_SETUP                             107
 305 # define DSA_F_DSA_SIG_NEW                                109
 306 # define DSA_F_DSA_SIG_PRINT                              123
 307 # define DSA_F_DSA_VERIFY                                 108
 308 # define DSA_F_I2D_DSA_SIG                                111
 309 # define DSA_F_OLD_DSA_PRIV_DECODE                        122
 310 # define DSA_F_PKEY_DSA_CTRL                              120
 311 # define DSA_F_PKEY_DSA_KEYGEN                            121
 312 # define DSA_F_SIG_CB                                     114
 313
 314 /* Reason codes. */
 315 # define DSA_R_BAD_Q_VALUE                                102
 316 # define DSA_R_BN_DECODE_ERROR                            108
 317 # define DSA_R_BN_ERROR                                   109
 318 # define DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE                100
 319 # define DSA_R_DECODE_ERROR                               104
 320 # define DSA_R_INVALID_DIGEST_TYPE                        106
 321 # define DSA_R_INVALID_PARAMETERS                         112
 322 # define DSA_R_KEY_SIZE_TOO_SMALL                         111
 323 # define DSA_R_MISSING_PARAMETERS                         101
 324 # define DSA_R_MODULUS_TOO_LARGE                          103
 325 # define DSA_R_NEED_NEW_SETUP_VALUES                      110
 326 # define DSA_R_NO_PARAMETERS_SET                          107
 327 # define DSA_R_PARAMETER_ENCODING_ERROR                   105
 328 # define DSA_R_Q_NOT_PRIME                                113
 329
 330 #ifdef  __cplusplus
 331 }
 332 #endif
 333 #endif