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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) 2000-2005 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/** Allocates and initialize a ECDSA_SIG structure
85 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
86 */
87ECDSA_SIG *ECDSA_SIG_new(void);
88
89/** frees a ECDSA_SIG structure
90 * \param sig pointer to the ECDSA_SIG structure
91 */
92void ECDSA_SIG_free(ECDSA_SIG *sig);
93
94/** DER encode content of ECDSA_SIG object (note: this function modifies *pp
95 * (*pp += length of the DER encoded signature)).
96 * \param sig pointer to the ECDSA_SIG object
97 * \param pp pointer to a unsigned char pointer for the output or NULL
98 * \return the length of the DER encoded ECDSA_SIG object or 0
99 */
100int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **pp);
101
102/** Decodes a DER encoded ECDSA signature (note: this function changes *pp
103 * (*pp += len)).
104 * \param sig pointer to ECDSA_SIG pointer (may be NULL)
105 * \param pp memory buffer with the DER encoded signature
106 * \param len length of the buffer
107 * \return pointer to the decoded ECDSA_SIG structure (or NULL)
108 */
109ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **sig, const unsigned char **pp, long len);
110
111/** Computes the ECDSA signature of the given hash value using
112 * the supplied private key and returns the created signature.
113 * \param dgst pointer to the hash value
114 * \param dgst_len length of the hash value
115 * \param eckey EC_KEY object containing a private EC key
116 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
117 */
118ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst,int dgst_len,EC_KEY *eckey);
119
120/** Computes ECDSA signature of a given hash value using the supplied
121 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
122 * \param dgst pointer to the hash value to sign
123 * \param dgstlen length of the hash value
124 * \param kinv BIGNUM with a pre-computed inverse k (optional)
125 * \param rp BIGNUM with a pre-computed rp value (optioanl),
126 * see ECDSA_sign_setup
127 * \param eckey EC_KEY object containing a private EC key
128 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
129 */
130ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst, int dgstlen,
131 const BIGNUM *kinv, const BIGNUM *rp, EC_KEY *eckey);
132
133/** Verifies that the supplied signature is a valid ECDSA
134 * signature of the supplied hash value using the supplied public key.
135 * \param dgst pointer to the hash value
136 * \param dgst_len length of the hash value
137 * \param sig ECDSA_SIG structure
138 * \param eckey EC_KEY object containing a public EC key
139 * \return 1 if the signature is valid, 0 if the signature is invalid
140 * and -1 on error
141 */
142int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
143 const ECDSA_SIG *sig, EC_KEY* eckey);
144
145const ECDSA_METHOD *ECDSA_OpenSSL(void);
146
147/** Sets the default ECDSA method
148 * \param meth new default ECDSA_METHOD
149 */
150void ECDSA_set_default_method(const ECDSA_METHOD *meth);
151
152/** Returns the default ECDSA method
153 * \return pointer to ECDSA_METHOD structure containing the default method
154 */
155const ECDSA_METHOD *ECDSA_get_default_method(void);
156
157/** Sets method to be used for the ECDSA operations
158 * \param eckey EC_KEY object
159 * \param meth new method
160 * \return 1 on success and 0 otherwise
161 */
162int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth);
163
164/** Returns the maximum length of the DER encoded signature
165 * \param eckey EC_KEY object
166 * \return numbers of bytes required for the DER encoded signature
167 */
168int ECDSA_size(const EC_KEY *eckey);
169
170/** Precompute parts of the signing operation
171 * \param eckey EC_KEY object containing a private EC key
172 * \param ctx BN_CTX object (optional)
173 * \param kinv BIGNUM pointer for the inverse of k
174 * \param rp BIGNUM pointer for x coordinate of k * generator
175 * \return 1 on success and 0 otherwise
176 */
177int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv,
178 BIGNUM **rp);
179
180/** Computes ECDSA signature of a given hash value using the supplied
181 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
182 * \param type this parameter is ignored
183 * \param dgst pointer to the hash value to sign
184 * \param dgstlen length of the hash value
185 * \param sig memory for the DER encoded created signature
186 * \param siglen pointer to the length of the returned signature
187 * \param eckey EC_KEY object containing a private EC key
188 * \return 1 on success and 0 otherwise
189 */
190int ECDSA_sign(int type, const unsigned char *dgst, int dgstlen,
191 unsigned char *sig, unsigned int *siglen, EC_KEY *eckey);
192
193
194/** Computes ECDSA signature of a given hash value using the supplied
195 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
196 * \param type this parameter is ignored
197 * \param dgst pointer to the hash value to sign
198 * \param dgstlen length of the hash value
199 * \param sig buffer to hold the DER encoded signature
200 * \param siglen pointer to the length of the returned signature
201 * \param kinv BIGNUM with a pre-computed inverse k (optional)
202 * \param rp BIGNUM with a pre-computed rp value (optioanl),
203 * see ECDSA_sign_setup
204 * \param eckey EC_KEY object containing a private EC key
205 * \return 1 on success and 0 otherwise
206 */
207int ECDSA_sign_ex(int type, const unsigned char *dgst, int dgstlen,
208 unsigned char *sig, unsigned int *siglen, const BIGNUM *kinv,
209 const BIGNUM *rp, EC_KEY *eckey);
210
211/** Verifies that the given signature is valid ECDSA signature
212 * of the supplied hash value using the specified public key.
213 * \param type this parameter is ignored
214 * \param dgst pointer to the hash value
215 * \param dgstlen length of the hash value
216 * \param sig pointer to the DER encoded signature
217 * \param siglen length of the DER encoded signature
218 * \param eckey EC_KEY object containing a public EC key
219 * \return 1 if the signature is valid, 0 if the signature is invalid
220 * and -1 on error
221 */
222int ECDSA_verify(int type, const unsigned char *dgst, int dgstlen,
223 const unsigned char *sig, int siglen, EC_KEY *eckey);
224
225/* the standard ex_data functions */
226int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new
227 *new_func, CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
228int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg);
229void *ECDSA_get_ex_data(EC_KEY *d, int idx);
230
231
232/* BEGIN ERROR CODES */
233/* The following lines are auto generated by the script mkerr.pl. Any changes
234 * made after this point may be overwritten when the script is next run.
235 */
236void ERR_load_ECDSA_strings(void);
237
238/* Error codes for the ECDSA functions. */
239
240/* Function codes. */
241#define ECDSA_F_ECDSA_DATA_NEW_METHOD 100
242#define ECDSA_F_ECDSA_DO_SIGN 101
243#define ECDSA_F_ECDSA_DO_VERIFY 102
244#define ECDSA_F_ECDSA_SIGN_SETUP 103
245
246/* Reason codes. */
247#define ECDSA_R_BAD_SIGNATURE 100
248#define ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 101
249#define ECDSA_R_ERR_EC_LIB 102
250#define ECDSA_R_MISSING_PARAMETERS 103
251#define ECDSA_R_NEED_NEW_SETUP_VALUES 106
252#define ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED 104
253#define ECDSA_R_SIGNATURE_MALLOC_FAILED 105
254
255#ifdef __cplusplus
256}
257#endif
258#endif
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