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.]
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 :-) */
69 #error DSA is disabled.
73 #include <openssl/bio.h>
75 #include <openssl/bn.h>
76 #include <openssl/crypto.h>
78 # include <openssl/dh.h>
81 #define DSA_FLAG_CACHE_MONT_P 0x01
87 typedef struct dsa_st DSA;
89 typedef struct DSA_SIG_st
95 typedef struct dsa_method {
97 DSA_SIG * (*dsa_do_sign)(const unsigned char *dgst, int dlen, DSA *dsa);
98 int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
100 int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len,
101 DSA_SIG *sig, DSA *dsa);
102 int (*dsa_mod_exp)(DSA *dsa, BIGNUM *rr, BIGNUM *a1, BIGNUM *p1,
103 BIGNUM *a2, BIGNUM *p2, BIGNUM *m, BN_CTX *ctx,
104 BN_MONT_CTX *in_mont);
105 int (*bn_mod_exp)(DSA *dsa, BIGNUM *r, BIGNUM *a, const BIGNUM *p,
106 const BIGNUM *m, BN_CTX *ctx,
107 BN_MONT_CTX *m_ctx); /* Can be null */
108 int (*init)(DSA *dsa);
109 int (*finish)(DSA *dsa);
116 /* This first variable is used to pick up errors where
117 * a DSA is passed instead of of a EVP_PKEY */
122 BIGNUM *q; /* == 20 */
125 BIGNUM *pub_key; /* y public key */
126 BIGNUM *priv_key; /* x private key */
128 BIGNUM *kinv; /* Signing pre-calc */
129 BIGNUM *r; /* Signing pre-calc */
132 /* Normally used to cache montgomery values */
135 CRYPTO_EX_DATA ex_data;
139 #define DSAparams_dup(x) (DSA *)ASN1_dup((int (*)())i2d_DSAparams, \
140 (char *(*)())d2i_DSAparams,(char *)(x))
141 #define d2i_DSAparams_fp(fp,x) (DSA *)ASN1_d2i_fp((char *(*)())DSA_new, \
142 (char *(*)())d2i_DSAparams,(fp),(unsigned char **)(x))
143 #define i2d_DSAparams_fp(fp,x) ASN1_i2d_fp(i2d_DSAparams,(fp), \
144 (unsigned char *)(x))
145 #define d2i_DSAparams_bio(bp,x) (DSA *)ASN1_d2i_bio((char *(*)())DSA_new, \
146 (char *(*)())d2i_DSAparams,(bp),(unsigned char **)(x))
147 #define i2d_DSAparams_bio(bp,x) ASN1_i2d_bio(i2d_DSAparams,(bp), \
148 (unsigned char *)(x))
151 DSA_SIG * DSA_SIG_new(void);
152 void DSA_SIG_free(DSA_SIG *a);
153 int i2d_DSA_SIG(DSA_SIG *a, unsigned char **pp);
154 DSA_SIG * d2i_DSA_SIG(DSA_SIG **v, unsigned char **pp, long length);
156 DSA_SIG * DSA_do_sign(const unsigned char *dgst,int dlen,DSA *dsa);
157 int DSA_do_verify(const unsigned char *dgst,int dgst_len,
158 DSA_SIG *sig,DSA *dsa);
160 DSA_METHOD *DSA_OpenSSL(void);
162 void DSA_set_default_method(DSA_METHOD *);
163 DSA_METHOD *DSA_get_default_method(void);
164 DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *);
167 DSA * DSA_new_method(DSA_METHOD *meth);
169 /* next 4 return -1 on error */
170 int DSA_sign_setup( DSA *dsa,BN_CTX *ctx_in,BIGNUM **kinvp,BIGNUM **rp);
171 int DSA_sign(int type,const unsigned char *dgst,int dlen,
172 unsigned char *sig, unsigned int *siglen, DSA *dsa);
173 int DSA_verify(int type,const unsigned char *dgst,int dgst_len,
174 unsigned char *sigbuf, int siglen, DSA *dsa);
175 void DSA_free (DSA *r);
176 int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
177 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
178 int DSA_set_ex_data(DSA *d, int idx, void *arg);
179 void *DSA_get_ex_data(DSA *d, int idx);
181 void ERR_load_DSA_strings(void );
183 DSA * d2i_DSAPublicKey(DSA **a, unsigned char **pp, long length);
184 DSA * d2i_DSAPrivateKey(DSA **a, unsigned char **pp, long length);
185 DSA * d2i_DSAparams(DSA **a, unsigned char **pp, long length);
186 DSA * DSA_generate_parameters(int bits, unsigned char *seed,int seed_len,
187 int *counter_ret, unsigned long *h_ret,void
188 (*callback)(int, int, void *),void *cb_arg);
189 int DSA_generate_key(DSA *a);
190 int i2d_DSAPublicKey(DSA *a, unsigned char **pp);
191 int i2d_DSAPrivateKey(DSA *a, unsigned char **pp);
192 int i2d_DSAparams(DSA *a,unsigned char **pp);
195 int DSAparams_print(BIO *bp, DSA *x);
196 int DSA_print(BIO *bp, DSA *x, int off);
199 int DSAparams_print_fp(FILE *fp, DSA *x);
200 int DSA_print_fp(FILE *bp, DSA *x, int off);
203 #define DSS_prime_checks 50
204 /* Primality test according to FIPS PUB 186[-1], Appendix 2.1:
205 * 50 rounds of Rabin-Miller */
206 #define DSA_is_prime(n, callback, cb_arg) \
207 BN_is_prime(n, DSS_prime_checks, callback, NULL, cb_arg)
210 /* Convert DSA structure (key or just parameters) into DH structure
211 * (be careful to avoid small subgroup attacks when using this!) */
212 DH *DSA_dup_DH(DSA *r);
215 /* BEGIN ERROR CODES */
216 /* The following lines are auto generated by the script mkerr.pl. Any changes
217 * made after this point may be overwritten when the script is next run.
220 /* Error codes for the DSA functions. */
222 /* Function codes. */
223 #define DSA_F_D2I_DSA_SIG 110
224 #define DSA_F_DSAPARAMS_PRINT 100
225 #define DSA_F_DSAPARAMS_PRINT_FP 101
226 #define DSA_F_DSA_DO_SIGN 112
227 #define DSA_F_DSA_DO_VERIFY 113
228 #define DSA_F_DSA_NEW 103
229 #define DSA_F_DSA_PRINT 104
230 #define DSA_F_DSA_PRINT_FP 105
231 #define DSA_F_DSA_SIGN 106
232 #define DSA_F_DSA_SIGN_SETUP 107
233 #define DSA_F_DSA_SIG_NEW 109
234 #define DSA_F_DSA_VERIFY 108
235 #define DSA_F_I2D_DSA_SIG 111
238 #define DSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 100