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1/* crypto/ecdsa/ecdsa.h */
2/**
3 * \file crypto/ecdsa/ecdsa.h Include file for the OpenSSL ECDSA functions
4 * \author Written by Nils Larsch for the OpenSSL project
5 */
6/* ====================================================================
7 * Copyright (c) 2000-2003 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59#ifndef HEADER_ECDSA_H
60#define HEADER_ECDSA_H
61
62#include <openssl/opensslconf.h>
63
64#ifdef OPENSSL_NO_ECDSA
65#error ECDSA is disabled.
66#endif
67
68#include <openssl/ec.h>
69#include <openssl/ossl_typ.h>
70#ifndef OPENSSL_NO_DEPRECATED
71#include <openssl/bn.h>
72#endif
73
74#ifdef __cplusplus
75extern "C" {
76#endif
77
78typedef struct ECDSA_SIG_st
79 {
80 BIGNUM *r;
81 BIGNUM *s;
82 } ECDSA_SIG;
83
84/** ECDSA_SIG *ECDSA_SIG_new(void)
85 * allocates and initialize a ECDSA_SIG structure
86 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
87 */
88ECDSA_SIG *ECDSA_SIG_new(void);
89
90/** ECDSA_SIG_free
91 * frees a ECDSA_SIG structure
92 * \param a pointer to the ECDSA_SIG structure
93 */
94void ECDSA_SIG_free(ECDSA_SIG *a);
95
96/** i2d_ECDSA_SIG
97 * DER encode content of ECDSA_SIG object (note: this function modifies *pp
98 * (*pp += length of the DER encoded signature)).
99 * \param a pointer to the ECDSA_SIG object
100 * \param pp pointer to a unsigned char pointer for the output or NULL
101 * \return the length of the DER encoded ECDSA_SIG object or 0
102 */
103int i2d_ECDSA_SIG(const ECDSA_SIG *a, unsigned char **pp);
104
105/** d2i_ECDSA_SIG
106 * decodes a DER encoded ECDSA signature (note: this function changes *pp
107 * (*pp += len)).
108 * \param v pointer to ECDSA_SIG pointer (may be NULL)
109 * \param pp buffer with the DER encoded signature
110 * \param len bufferlength
111 * \return pointer to the decoded ECDSA_SIG structure (or NULL)
112 */
113ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **v, const unsigned char **pp, long len);
114
115/** ECDSA_do_sign
116 * computes the ECDSA signature of the given hash value using
117 * the supplied private key and returns the created signature.
118 * \param dgst pointer to the hash value
119 * \param dgst_len length of the hash value
120 * \param eckey pointer to the EC_KEY object containing a private EC key
121 * \return pointer to a ECDSA_SIG structure or NULL
122 */
123ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst,int dgst_len,EC_KEY *eckey);
124
125/** ECDSA_do_sign_ex
126 * computes ECDSA signature of a given hash value using the supplied
127 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
128 * \param dgst pointer to the hash value to sign
129 * \param dgstlen length of the hash value
130 * \param kinv optional pointer to a pre-computed inverse k
131 * \param rp optional pointer to the pre-computed rp value (see
132 * ECDSA_sign_setup
133 * \param eckey pointer to the EC_KEY object containing a private EC key
134 * \return pointer to a ECDSA_SIG structure or NULL
135 */
136ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst, int dgstlen,
137 const BIGNUM *kinv, const BIGNUM *rp, EC_KEY *eckey);
138
139/** ECDSA_do_verify
140 * verifies that the supplied signature is a valid ECDSA
141 * signature of the supplied hash value using the supplied public key.
142 * \param dgst pointer to the hash value
143 * \param dgst_len length of the hash value
144 * \param sig pointer to the ECDSA_SIG structure
145 * \param eckey pointer to the EC_KEY object containing a public EC key
146 * \return 1 if the signature is valid, 0 if the signature is invalid and -1 on error
147 */
148int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
149 const ECDSA_SIG *sig, EC_KEY* eckey);
150
151const ECDSA_METHOD *ECDSA_OpenSSL(void);
152
153/** ECDSA_set_default_method
154 * sets the default ECDSA method
155 * \param meth the new default ECDSA_METHOD
156 */
157void ECDSA_set_default_method(const ECDSA_METHOD *meth);
158
159/** ECDSA_get_default_method
160 * returns the default ECDSA method
161 * \return pointer to ECDSA_METHOD structure containing the default method
162 */
163const ECDSA_METHOD *ECDSA_get_default_method(void);
164
165/** ECDSA_set_method
166 * sets method to be used for the ECDSA operations
167 * \param eckey pointer to the EC_KEY object
168 * \param meth pointer to the new method
169 * \return 1 on success and 0 otherwise
170 */
171int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth);
172
173/** ECDSA_size
174 * returns the maximum length of the DER encoded signature
175 * \param eckey pointer to a EC_KEY object
176 * \return numbers of bytes required for the DER encoded signature
177 */
178int ECDSA_size(const EC_KEY *eckey);
179
180/** ECDSA_sign_setup
181 * precompute parts of the signing operation.
182 * \param eckey pointer to the EC_KEY object containing a private EC key
183 * \param ctx pointer to a BN_CTX object (may be NULL)
184 * \param kinv pointer to a BIGNUM pointer for the inverse of k
185 * \param rp pointer to a BIGNUM pointer for x coordinate of k * generator
186 * \return 1 on success and 0 otherwise
187 */
188int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv,
189 BIGNUM **rp);
190
191/** ECDSA_sign
192 * computes ECDSA signature of a given hash value using the supplied
193 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
194 * \param type this parameter is ignored
195 * \param dgst pointer to the hash value to sign
196 * \param dgstlen length of the hash value
197 * \param sig buffer to hold the DER encoded signature
198 * \param siglen pointer to the length of the returned signature
199 * \param eckey pointer to the EC_KEY object containing a private EC key
200 * \return 1 on success and 0 otherwise
201 */
202int ECDSA_sign(int type, const unsigned char *dgst, int dgstlen,
203 unsigned char *sig, unsigned int *siglen, EC_KEY *eckey);
204
205
206/** ECDSA_sign_ex
207 * computes ECDSA signature of a given hash value using the supplied
208 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
209 * \param type this parameter is ignored
210 * \param dgst pointer to the hash value to sign
211 * \param dgstlen length of the hash value
212 * \param sig buffer to hold the DER encoded signature
213 * \param siglen pointer to the length of the returned signature
214 * \param kinv optional pointer to a pre-computed inverse k
215 * \param rp optional pointer to the pre-computed rp value (see
216 * ECDSA_sign_setup
217 * \param eckey pointer to the EC_KEY object containing a private EC key
218 * \return 1 on success and 0 otherwise
219 */
220int ECDSA_sign_ex(int type, const unsigned char *dgst, int dgstlen,
221 unsigned char *sig, unsigned int *siglen, const BIGNUM *kinv,
222 const BIGNUM *rp, EC_KEY *eckey);
223
224/** ECDSA_verify
225 * verifies that the given signature is valid ECDSA signature
226 * of the supplied hash value using the specified public key.
227 * \param type this parameter is ignored
228 * \param dgst pointer to the hash value
229 * \param dgstlen length of the hash value
230 * \param sig pointer to the DER encoded signature
231 * \param siglen length of the DER encoded signature
232 * \param eckey pointer to the EC_KEY object containing a public EC key
233 * \return 1 if the signature is valid, 0 if the signature is invalid and -1 on error
234 */
235int ECDSA_verify(int type, const unsigned char *dgst, int dgstlen,
236 const unsigned char *sig, int siglen, EC_KEY *eckey);
237
238/* the standard ex_data functions */
239int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new
240 *new_func, CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
241int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg);
242void *ECDSA_get_ex_data(EC_KEY *d, int idx);
243
244
245/* BEGIN ERROR CODES */
246/* The following lines are auto generated by the script mkerr.pl. Any changes
247 * made after this point may be overwritten when the script is next run.
248 */
249void ERR_load_ECDSA_strings(void);
250
251/* Error codes for the ECDSA functions. */
252
253/* Function codes. */
254#define ECDSA_F_ECDSA_DATA_NEW_METHOD 100
255#define ECDSA_F_ECDSA_DO_SIGN 101
256#define ECDSA_F_ECDSA_DO_VERIFY 102
257#define ECDSA_F_ECDSA_SIGN_SETUP 103
258
259/* Reason codes. */
260#define ECDSA_R_BAD_SIGNATURE 100
261#define ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 101
262#define ECDSA_R_ERR_EC_LIB 102
263#define ECDSA_R_MISSING_PARAMETERS 103
264#define ECDSA_R_NEED_NEW_SETUP_VALUES 106
265#define ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED 104
266#define ECDSA_R_SIGNATURE_MALLOC_FAILED 105
267
268#ifdef __cplusplus
269}
270#endif
271#endif
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