crypto/dsa/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>.  He basically did the
  62  * work and I have just tweaked them a little to fit into my
  63  * stylistic vision for SSLeay :-) */
  64
  65 #ifndef HEADER_DSA_H
  66 #define HEADER_DSA_H
  67
  68 #include <openssl/e_os2.h>
  69
  70 #ifdef OPENSSL_NO_DSA
  71 #error DSA is disabled.
  72 #endif
  73
  74 #ifndef OPENSSL_NO_BIO
  75 #include <openssl/bio.h>
  76 #endif
  77 #include <openssl/crypto.h>
  78 #include <openssl/ossl_typ.h>
  79
  80 #ifndef OPENSSL_NO_DEPRECATED
  81 #include <openssl/bn.h>
  82 #ifndef OPENSSL_NO_DH
  83 # include <openssl/dh.h>
  84 #endif
  85 #endif
  86
  87 #define DSA_FLAG_CACHE_MONT_P   0x01
  88 #define DSA_FLAG_NO_EXP_CONSTTIME       0x02 /* new with 0.9.7h; the built-in DSA
  89                                               * implementation now uses constant time
  90                                               * modular exponentiation for secret exponents
  91                                               * by default. This flag causes the
  92                                               * faster variable sliding window method to
  93                                               * be used for all exponents.
  94                                               */
  95
  96 #ifdef  __cplusplus
  97 extern "C" {
  98 #endif
  99
 100 /* Already defined in ossl_typ.h */
 101 /* typedef struct dsa_st DSA; */
 102 /* typedef struct dsa_method DSA_METHOD; */
 103
 104 typedef struct DSA_SIG_st
 105         {
 106         BIGNUM *r;
 107         BIGNUM *s;
 108         } DSA_SIG;
 109
 110 struct dsa_method
 111         {
 112         const char *name;
 113         DSA_SIG * (*dsa_do_sign)(const unsigned char *dgst, int dlen, DSA *dsa);
 114         int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
 115                                                                 BIGNUM **rp);
 116         int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len,
 117                                                         DSA_SIG *sig, DSA *dsa);
 118         int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
 119                         BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
 120                         BN_MONT_CTX *in_mont);
 121         int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
 122                                 const BIGNUM *m, BN_CTX *ctx,
 123                                 BN_MONT_CTX *m_ctx); /* Can be null */
 124         int (*init)(DSA *dsa);
 125         int (*finish)(DSA *dsa);
 126         int flags;
 127         char *app_data;
 128         /* If this is non-NULL, it is used to generate DSA parameters */
 129         int (*dsa_paramgen)(DSA *dsa, int bits,
 130                         unsigned char *seed, int seed_len,
 131                         int *counter_ret, unsigned long *h_ret,
 132                         BN_GENCB *cb);
 133         /* If this is non-NULL, it is used to generate DSA keys */
 134         int (*dsa_keygen)(DSA *dsa);
 135         };
 136
 137 struct dsa_st
 138         {
 139         /* This first variable is used to pick up errors where
 140          * a DSA is passed instead of of a EVP_PKEY */
 141         int pad;
 142         long version;
 143         int write_params;
 144         BIGNUM *p;
 145         BIGNUM *q;      /* == 20 */
 146         BIGNUM *g;
 147
 148         BIGNUM *pub_key;  /* y public key */
 149         BIGNUM *priv_key; /* x private key */
 150
 151         BIGNUM *kinv;   /* Signing pre-calc */
 152         BIGNUM *r;      /* Signing pre-calc */
 153
 154         int flags;
 155         /* Normally used to cache montgomery values */
 156         BN_MONT_CTX *method_mont_p;
 157         int references;
 158         CRYPTO_EX_DATA ex_data;
 159         const DSA_METHOD *meth;
 160         /* functional reference if 'meth' is ENGINE-provided */
 161         ENGINE *engine;
 162         };
 163
 164 #define DSAparams_dup(x) ASN1_dup_of_const(DSA,i2d_DSAparams,d2i_DSAparams,x)
 165 #define d2i_DSAparams_fp(fp,x) (DSA *)ASN1_d2i_fp((char *(*)())DSA_new, \
 166                 (char *(*)())d2i_DSAparams,(fp),(unsigned char **)(x))
 167 #define i2d_DSAparams_fp(fp,x) ASN1_i2d_fp(i2d_DSAparams,(fp), \
 168                 (unsigned char *)(x))
 169 #define d2i_DSAparams_bio(bp,x) ASN1_d2i_bio_of(DSA,DSA_new,d2i_DSAparams,bp,x)
 170 #define i2d_DSAparams_bio(bp,x) ASN1_i2d_bio_of_const(DSA,i2d_DSAparams,bp,x)
 171
 172
 173 DSA_SIG * DSA_SIG_new(void);
 174 void    DSA_SIG_free(DSA_SIG *a);
 175 int     i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
 176 DSA_SIG * d2i_DSA_SIG(DSA_SIG **v, const unsigned char **pp, long length);
 177
 178 DSA_SIG * DSA_do_sign(const unsigned char *dgst,int dlen,DSA *dsa);
 179 int     DSA_do_verify(const unsigned char *dgst,int dgst_len,
 180                       DSA_SIG *sig,DSA *dsa);
 181
 182 const DSA_METHOD *DSA_OpenSSL(void);
 183
 184 void    DSA_set_default_method(const DSA_METHOD *);
 185 const DSA_METHOD *DSA_get_default_method(void);
 186 int     DSA_set_method(DSA *dsa, const DSA_METHOD *);
 187
 188 DSA *   DSA_new(void);
 189 DSA *   DSA_new_method(ENGINE *engine);
 190 void    DSA_free (DSA *r);
 191 /* "up" the DSA object's reference count */
 192 int     DSA_up_ref(DSA *r);
 193 int     DSA_size(const DSA *);
 194         /* next 4 return -1 on error */
 195 int     DSA_sign_setup( DSA *dsa,BN_CTX *ctx_in,BIGNUM **kinvp,BIGNUM **rp);
 196 int     DSA_sign(int type,const unsigned char *dgst,int dlen,
 197                 unsigned char *sig, unsigned int *siglen, DSA *dsa);
 198 int     DSA_verify(int type,const unsigned char *dgst,int dgst_len,
 199                 const unsigned char *sigbuf, int siglen, DSA *dsa);
 200 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 201              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
 202 int DSA_set_ex_data(DSA *d, int idx, void *arg);
 203 void *DSA_get_ex_data(DSA *d, int idx);
 204
 205 DSA *   d2i_DSAPublicKey(DSA **a, const unsigned char **pp, long length);
 206 DSA *   d2i_DSAPrivateKey(DSA **a, const unsigned char **pp, long length);
 207 DSA *   d2i_DSAparams(DSA **a, const unsigned char **pp, long length);
 208
 209 /* Deprecated version */
 210 #ifndef OPENSSL_NO_DEPRECATED
 211 DSA *   DSA_generate_parameters(int bits,
 212                 unsigned char *seed,int seed_len,
 213                 int *counter_ret, unsigned long *h_ret,void
 214                 (*callback)(int, int, void *),void *cb_arg);
 215 #endif /* !defined(OPENSSL_NO_DEPRECATED) */
 216
 217 /* New version */
 218 int     DSA_generate_parameters_ex(DSA *dsa, int bits,
 219                 unsigned char *seed,int seed_len,
 220                 int *counter_ret, unsigned long *h_ret, BN_GENCB *cb);
 221
 222 int     DSA_generate_key(DSA *a);
 223 int     i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
 224 int     i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
 225 int     i2d_DSAparams(const DSA *a,unsigned char **pp);
 226
 227 #ifndef OPENSSL_NO_BIO
 228 int     DSAparams_print(BIO *bp, const DSA *x);
 229 int     DSA_print(BIO *bp, const DSA *x, int off);
 230 #endif
 231 #ifndef OPENSSL_NO_FP_API
 232 int     DSAparams_print_fp(FILE *fp, const DSA *x);
 233 int     DSA_print_fp(FILE *bp, const DSA *x, int off);
 234 #endif
 235
 236 #define DSS_prime_checks 50
 237 /* Primality test according to FIPS PUB 186[-1], Appendix 2.1:
 238  * 50 rounds of Rabin-Miller */
 239 #define DSA_is_prime(n, callback, cb_arg) \
 240         BN_is_prime(n, DSS_prime_checks, callback, NULL, cb_arg)
 241
 242 #ifndef OPENSSL_NO_DH
 243 /* Convert DSA structure (key or just parameters) into DH structure
 244  * (be careful to avoid small subgroup attacks when using this!) */
 245 DH *DSA_dup_DH(const DSA *r);
 246 #endif
 247
 248 /* BEGIN ERROR CODES */
 249 /* The following lines are auto generated by the script mkerr.pl. Any changes
 250  * made after this point may be overwritten when the script is next run.
 251  */
 252 void ERR_load_DSA_strings(void);
 253
 254 /* Error codes for the DSA functions. */
 255
 256 /* Function codes. */
 257 #define DSA_F_D2I_DSA_SIG                                110
 258 #define DSA_F_DSAPARAMS_PRINT                            100
 259 #define DSA_F_DSAPARAMS_PRINT_FP                         101
 260 #define DSA_F_DSA_DO_SIGN                                112
 261 #define DSA_F_DSA_DO_VERIFY                              113
 262 #define DSA_F_DSA_NEW_METHOD                             103
 263 #define DSA_F_DSA_PARAM_DECODE                           119
 264 #define DSA_F_DSA_PRINT                                  104
 265 #define DSA_F_DSA_PRINT_FP                               105
 266 #define DSA_F_DSA_PRIV_DECODE                            115
 267 #define DSA_F_DSA_PRIV_ENCODE                            116
 268 #define DSA_F_DSA_PUB_DECODE                             117
 269 #define DSA_F_DSA_PUB_ENCODE                             118
 270 #define DSA_F_DSA_SIGN                                   106
 271 #define DSA_F_DSA_SIGN_SETUP                             107
 272 #define DSA_F_DSA_SIG_NEW                                109
 273 #define DSA_F_DSA_VERIFY                                 108
 274 #define DSA_F_I2D_DSA_SIG                                111
 275 #define DSA_F_SIG_CB                                     114
 276
 277 /* Reason codes. */
 278 #define DSA_R_BN_DECODE_ERROR                            102
 279 #define DSA_R_BN_ERROR                                   103
 280 #define DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE                100
 281 #define DSA_R_DECODE_ERROR                               104
 282 #define DSA_R_MISSING_PARAMETERS                         101
 283 #define DSA_R_PARAMETER_ENCODING_ERROR                   105
 284
 285 #ifdef  __cplusplus
 286 }
 287 #endif
 288 #endif