2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
59 © Portions copyright (c) 2006 Nokia Corporation. All rights reserved.
63 * The DSS routines are based on patches supplied by
64 * Steven Schoch <schoch@sheba.arc.nasa.gov>. He basically did the
65 * work and I have just tweaked them a little to fit into my
66 * stylistic vision for SSLeay :-) */
73 #include <openssl/e_os2.h>
76 #error DSA is disabled.
79 #ifndef OPENSSL_NO_BIO
80 #include <openssl/bio.h>
82 #include <openssl/crypto.h>
83 #include <openssl/ossl_typ.h>
85 #ifndef OPENSSL_NO_DEPRECATED
86 #include <openssl/bn.h>
88 # include <openssl/dh.h>
91 #ifndef OPENSSL_DSA_MAX_MODULUS_BITS
92 # define OPENSSL_DSA_MAX_MODULUS_BITS 10000
95 #define DSA_FLAG_CACHE_MONT_P 0x01
96 #define DSA_FLAG_NO_EXP_CONSTTIME 0x02 /* new with 0.9.7h; the built-in DSA
97 * implementation now uses constant time
98 * modular exponentiation for secret exponents
99 * by default. This flag causes the
100 * faster variable sliding window method to
101 * be used for all exponents.
108 /* Already defined in ossl_typ.h */
109 /* typedef struct dsa_st DSA; */
110 /* typedef struct dsa_method DSA_METHOD; */
112 typedef struct DSA_SIG_st
121 DSA_SIG * (*dsa_do_sign)(const unsigned char *dgst, int dlen, DSA *dsa);
122 int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
124 int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len,
125 DSA_SIG *sig, DSA *dsa);
126 int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
127 BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
128 BN_MONT_CTX *in_mont);
129 int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
130 const BIGNUM *m, BN_CTX *ctx,
131 BN_MONT_CTX *m_ctx); /* Can be null */
132 int (*init)(DSA *dsa);
133 int (*finish)(DSA *dsa);
136 /* If this is non-NULL, it is used to generate DSA parameters */
137 int (*dsa_paramgen)(DSA *dsa, int bits,
138 unsigned char *seed, int seed_len,
139 int *counter_ret, unsigned long *h_ret,
141 /* If this is non-NULL, it is used to generate DSA keys */
142 int (*dsa_keygen)(DSA *dsa);
147 /* This first variable is used to pick up errors where
148 * a DSA is passed instead of of a EVP_PKEY */
153 BIGNUM *q; /* == 20 */
156 BIGNUM *pub_key; /* y public key */
157 BIGNUM *priv_key; /* x private key */
159 BIGNUM *kinv; /* Signing pre-calc */
160 BIGNUM *r; /* Signing pre-calc */
163 /* Normally used to cache montgomery values */
164 BN_MONT_CTX *method_mont_p;
166 CRYPTO_EX_DATA ex_data;
167 const DSA_METHOD *meth;
168 /* functional reference if 'meth' is ENGINE-provided */
172 #define DSAparams_dup(x) ASN1_dup_of_const(DSA,i2d_DSAparams,d2i_DSAparams,x)
173 #define d2i_DSAparams_fp(fp,x) (DSA *)ASN1_d2i_fp((char *(*)())DSA_new, \
174 (char *(*)())d2i_DSAparams,(fp),(unsigned char **)(x))
175 #define i2d_DSAparams_fp(fp,x) ASN1_i2d_fp(i2d_DSAparams,(fp), \
176 (unsigned char *)(x))
177 #define d2i_DSAparams_bio(bp,x) ASN1_d2i_bio_of(DSA,DSA_new,d2i_DSAparams,bp,x)
178 #define i2d_DSAparams_bio(bp,x) ASN1_i2d_bio_of_const(DSA,i2d_DSAparams,bp,x)
181 IMPORT_C DSA_SIG * DSA_SIG_new(void);
182 IMPORT_C void DSA_SIG_free(DSA_SIG *a);
183 IMPORT_C int i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
184 IMPORT_C DSA_SIG * d2i_DSA_SIG(DSA_SIG **v, const unsigned char **pp, long length);
186 IMPORT_C DSA_SIG * DSA_do_sign(const unsigned char *dgst,int dlen,DSA *dsa);
187 IMPORT_C int DSA_do_verify(const unsigned char *dgst,int dgst_len,
188 DSA_SIG *sig,DSA *dsa);
190 IMPORT_C const DSA_METHOD *DSA_OpenSSL(void);
192 IMPORT_C void DSA_set_default_method(const DSA_METHOD *);
193 IMPORT_C const DSA_METHOD *DSA_get_default_method(void);
194 IMPORT_C int DSA_set_method(DSA *dsa, const DSA_METHOD *);
196 IMPORT_C DSA * DSA_new(void);
197 IMPORT_C DSA * DSA_new_method(ENGINE *engine);
198 IMPORT_C void DSA_free (DSA *r);
199 /* "up" the DSA object's reference count */
200 IMPORT_C int DSA_up_ref(DSA *r);
201 IMPORT_C int DSA_size(const DSA *);
202 /* next 4 return -1 on error */
203 IMPORT_C int DSA_sign_setup( DSA *dsa,BN_CTX *ctx_in,BIGNUM **kinvp,BIGNUM **rp);
204 IMPORT_C int DSA_sign(int type,const unsigned char *dgst,int dlen,
205 unsigned char *sig, unsigned int *siglen, DSA *dsa);
206 IMPORT_C int DSA_verify(int type,const unsigned char *dgst,int dgst_len,
207 const unsigned char *sigbuf, int siglen, DSA *dsa);
208 IMPORT_C int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
209 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
210 IMPORT_C int DSA_set_ex_data(DSA *d, int idx, void *arg);
211 IMPORT_C void *DSA_get_ex_data(DSA *d, int idx);
213 IMPORT_C DSA * d2i_DSAPublicKey(DSA **a, const unsigned char **pp, long length);
214 IMPORT_C DSA * d2i_DSAPrivateKey(DSA **a, const unsigned char **pp, long length);
215 IMPORT_C DSA * d2i_DSAparams(DSA **a, const unsigned char **pp, long length);
217 /* Deprecated version */
218 #ifndef OPENSSL_NO_DEPRECATED
219 IMPORT_C DSA * DSA_generate_parameters(int bits,
220 unsigned char *seed,int seed_len,
221 int *counter_ret, unsigned long *h_ret,void
222 (*callback)(int, int, void *),void *cb_arg);
223 #endif /* !defined(OPENSSL_NO_DEPRECATED) */
226 IMPORT_C int DSA_generate_parameters_ex(DSA *dsa, int bits,
227 unsigned char *seed,int seed_len,
228 int *counter_ret, unsigned long *h_ret, BN_GENCB *cb);
230 IMPORT_C int DSA_generate_key(DSA *a);
231 IMPORT_C int i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
232 IMPORT_C int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
233 IMPORT_C int i2d_DSAparams(const DSA *a,unsigned char **pp);
235 #ifndef OPENSSL_NO_BIO
236 IMPORT_C int DSAparams_print(BIO *bp, const DSA *x);
237 IMPORT_C int DSA_print(BIO *bp, const DSA *x, int off);
239 #ifndef OPENSSL_NO_FP_API
240 IMPORT_C int DSAparams_print_fp(FILE *fp, const DSA *x);
241 IMPORT_C int DSA_print_fp(FILE *bp, const DSA *x, int off);
244 #define DSS_prime_checks 50
245 /* Primality test according to FIPS PUB 186[-1], Appendix 2.1:
246 * 50 rounds of Rabin-Miller */
247 #define DSA_is_prime(n, callback, cb_arg) \
248 BN_is_prime(n, DSS_prime_checks, callback, NULL, cb_arg)
250 #ifndef OPENSSL_NO_DH
251 /* Convert DSA structure (key or just parameters) into DH structure
252 * (be careful to avoid small subgroup attacks when using this!) */
253 IMPORT_C DH *DSA_dup_DH(const DSA *r);
256 /* BEGIN ERROR CODES */
257 /* The following lines are auto generated by the script mkerr.pl. Any changes
258 * made after this point may be overwritten when the script is next run.
260 IMPORT_C void ERR_load_DSA_strings(void);
262 /* Error codes for the DSA functions. */
264 /* Function codes. */
265 #define DSA_F_D2I_DSA_SIG 110
266 #define DSA_F_DSAPARAMS_PRINT 100
267 #define DSA_F_DSAPARAMS_PRINT_FP 101
268 #define DSA_F_DSA_DO_SIGN 112
269 #define DSA_F_DSA_DO_VERIFY 113
270 #define DSA_F_DSA_NEW_METHOD 103
271 #define DSA_F_DSA_PRINT 104
272 #define DSA_F_DSA_PRINT_FP 105
273 #define DSA_F_DSA_SIGN 106
274 #define DSA_F_DSA_SIGN_SETUP 107
275 #define DSA_F_DSA_SIG_NEW 109
276 #define DSA_F_DSA_VERIFY 108
277 #define DSA_F_I2D_DSA_SIG 111
278 #define DSA_F_SIG_CB 114
281 #define DSA_R_BAD_Q_VALUE 102
282 #define DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 100
283 #define DSA_R_MISSING_PARAMETERS 101
284 #define DSA_R_MODULUS_TOO_LARGE 103