dsa.h revision 280304
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# ifndef OPENSSL_DSA_MAX_MODULUS_BITS 88# define OPENSSL_DSA_MAX_MODULUS_BITS 10000 89# endif 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 115 116#ifdef __cplusplus 117extern "C" { 118#endif 119 120/* Already defined in ossl_typ.h */ 121/* typedef struct dsa_st DSA; */ 122/* typedef struct dsa_method DSA_METHOD; */ 123 124typedef struct DSA_SIG_st { 125 BIGNUM *r; 126 BIGNUM *s; 127} DSA_SIG; 128 129struct dsa_method { 130 const char *name; 131 DSA_SIG *(*dsa_do_sign) (const unsigned char *dgst, int dlen, DSA *dsa); 132 int (*dsa_sign_setup) (DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, 133 BIGNUM **rp); 134 int (*dsa_do_verify) (const unsigned char *dgst, int dgst_len, 135 DSA_SIG *sig, DSA *dsa); 136 int (*dsa_mod_exp) (DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1, 137 BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx, 138 BN_MONT_CTX *in_mont); 139 /* Can be null */ 140 int (*bn_mod_exp) (DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p, 141 const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx); 142 int (*init) (DSA *dsa); 143 int (*finish) (DSA *dsa); 144 int flags; 145 char *app_data; 146 /* If this is non-NULL, it is used to generate DSA parameters */ 147 int (*dsa_paramgen) (DSA *dsa, int bits, 148 const unsigned char *seed, int seed_len, 149 int *counter_ret, unsigned long *h_ret, 150 BN_GENCB *cb); 151 /* If this is non-NULL, it is used to generate DSA keys */ 152 int (*dsa_keygen) (DSA *dsa); 153}; 154 155struct dsa_st { 156 /* 157 * This first variable is used to pick up errors where a DSA is passed 158 * instead of of a EVP_PKEY 159 */ 160 int pad; 161 long version; 162 int write_params; 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 187DSA *DSAparams_dup(DSA *x); 188DSA_SIG *DSA_SIG_new(void); 189void DSA_SIG_free(DSA_SIG *a); 190int i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp); 191DSA_SIG *d2i_DSA_SIG(DSA_SIG **v, const unsigned char **pp, long length); 192 193DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa); 194int DSA_do_verify(const unsigned char *dgst, int dgst_len, 195 DSA_SIG *sig, DSA *dsa); 196 197const DSA_METHOD *DSA_OpenSSL(void); 198 199void DSA_set_default_method(const DSA_METHOD *); 200const DSA_METHOD *DSA_get_default_method(void); 201int DSA_set_method(DSA *dsa, const DSA_METHOD *); 202 203DSA *DSA_new(void); 204DSA *DSA_new_method(ENGINE *engine); 205void DSA_free(DSA *r); 206/* "up" the DSA object's reference count */ 207int DSA_up_ref(DSA *r); 208int DSA_size(const DSA *); 209 /* next 4 return -1 on error */ 210int DSA_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp); 211int DSA_sign(int type, const unsigned char *dgst, int dlen, 212 unsigned char *sig, unsigned int *siglen, DSA *dsa); 213int DSA_verify(int type, const unsigned char *dgst, int dgst_len, 214 const unsigned char *sigbuf, int siglen, DSA *dsa); 215int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, 216 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func); 217int DSA_set_ex_data(DSA *d, int idx, void *arg); 218void *DSA_get_ex_data(DSA *d, int idx); 219 220DSA *d2i_DSAPublicKey(DSA **a, const unsigned char **pp, long length); 221DSA *d2i_DSAPrivateKey(DSA **a, const unsigned char **pp, long length); 222DSA *d2i_DSAparams(DSA **a, const unsigned char **pp, long length); 223 224/* Deprecated version */ 225# ifndef OPENSSL_NO_DEPRECATED 226DSA *DSA_generate_parameters(int bits, 227 unsigned char *seed, int seed_len, 228 int *counter_ret, unsigned long *h_ret, void 229 (*callback) (int, int, void *), void *cb_arg); 230# endif /* !defined(OPENSSL_NO_DEPRECATED) */ 231 232/* New version */ 233int DSA_generate_parameters_ex(DSA *dsa, int bits, 234 const unsigned char *seed, int seed_len, 235 int *counter_ret, unsigned long *h_ret, 236 BN_GENCB *cb); 237 238int DSA_generate_key(DSA *a); 239int i2d_DSAPublicKey(const DSA *a, unsigned char **pp); 240int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp); 241int i2d_DSAparams(const DSA *a, unsigned char **pp); 242 243# ifndef OPENSSL_NO_BIO 244int DSAparams_print(BIO *bp, const DSA *x); 245int DSA_print(BIO *bp, const DSA *x, int off); 246# endif 247# ifndef OPENSSL_NO_FP_API 248int DSAparams_print_fp(FILE *fp, const DSA *x); 249int DSA_print_fp(FILE *bp, const DSA *x, int off); 250# endif 251 252# define DSS_prime_checks 50 253/* 254 * Primality test according to FIPS PUB 186[-1], Appendix 2.1: 50 rounds of 255 * Rabin-Miller 256 */ 257# define DSA_is_prime(n, callback, cb_arg) \ 258 BN_is_prime(n, DSS_prime_checks, callback, NULL, cb_arg) 259 260# ifndef OPENSSL_NO_DH 261/* 262 * Convert DSA structure (key or just parameters) into DH structure (be 263 * careful to avoid small subgroup attacks when using this!) 264 */ 265DH *DSA_dup_DH(const DSA *r); 266# endif 267 268# define EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits) \ 269 EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN, \ 270 EVP_PKEY_CTRL_DSA_PARAMGEN_BITS, nbits, NULL) 271 272# define EVP_PKEY_CTRL_DSA_PARAMGEN_BITS (EVP_PKEY_ALG_CTRL + 1) 273# define EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS (EVP_PKEY_ALG_CTRL + 2) 274# define EVP_PKEY_CTRL_DSA_PARAMGEN_MD (EVP_PKEY_ALG_CTRL + 3) 275 276/* BEGIN ERROR CODES */ 277/* 278 * The following lines are auto generated by the script mkerr.pl. Any changes 279 * made after this point may be overwritten when the script is next run. 280 */ 281void ERR_load_DSA_strings(void); 282 283/* Error codes for the DSA functions. */ 284 285/* Function codes. */ 286# define DSA_F_D2I_DSA_SIG 110 287# define DSA_F_DO_DSA_PRINT 104 288# define DSA_F_DSAPARAMS_PRINT 100 289# define DSA_F_DSAPARAMS_PRINT_FP 101 290# define DSA_F_DSA_DO_SIGN 112 291# define DSA_F_DSA_DO_VERIFY 113 292# define DSA_F_DSA_GENERATE_KEY 124 293# define DSA_F_DSA_GENERATE_PARAMETERS_EX 123 294# define DSA_F_DSA_NEW_METHOD 103 295# define DSA_F_DSA_PARAM_DECODE 119 296# define DSA_F_DSA_PRINT_FP 105 297# define DSA_F_DSA_PRIV_DECODE 115 298# define DSA_F_DSA_PRIV_ENCODE 116 299# define DSA_F_DSA_PUB_DECODE 117 300# define DSA_F_DSA_PUB_ENCODE 118 301# define DSA_F_DSA_SIGN 106 302# define DSA_F_DSA_SIGN_SETUP 107 303# define DSA_F_DSA_SIG_NEW 109 304# define DSA_F_DSA_SIG_PRINT 125 305# define DSA_F_DSA_VERIFY 108 306# define DSA_F_I2D_DSA_SIG 111 307# define DSA_F_OLD_DSA_PRIV_DECODE 122 308# define DSA_F_PKEY_DSA_CTRL 120 309# define DSA_F_PKEY_DSA_KEYGEN 121 310# define DSA_F_SIG_CB 114 311 312/* Reason codes. */ 313# define DSA_R_BAD_Q_VALUE 102 314# define DSA_R_BN_DECODE_ERROR 108 315# define DSA_R_BN_ERROR 109 316# define DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 100 317# define DSA_R_DECODE_ERROR 104 318# define DSA_R_INVALID_DIGEST_TYPE 106 319# define DSA_R_MISSING_PARAMETERS 101 320# define DSA_R_MODULUS_TOO_LARGE 103 321# define DSA_R_NEED_NEW_SETUP_VALUES 110 322# define DSA_R_NON_FIPS_DSA_METHOD 111 323# define DSA_R_NO_PARAMETERS_SET 107 324# define DSA_R_PARAMETER_ENCODING_ERROR 105 325 326#ifdef __cplusplus 327} 328#endif 329#endif 330