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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
75 extern "C" {
76 #endif
77 
78 typedef 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  */
87 ECDSA_SIG *ECDSA_SIG_new(void);
88 
89 /** frees a ECDSA_SIG structure
90  *  \param  sig  pointer to the ECDSA_SIG structure
91  */
92 void	  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  */
100 int	  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  */
109 ECDSA_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  */
118 ECDSA_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  */
130 ECDSA_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  */
142 int	  ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
143 		const ECDSA_SIG *sig, EC_KEY* eckey);
144 
145 const ECDSA_METHOD *ECDSA_OpenSSL(void);
146 
147 /** Sets the default ECDSA method
148  *  \param  meth  new default ECDSA_METHOD
149  */
150 void	  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  */
155 const 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  */
162 int 	  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  */
168 int	  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  */
177 int 	  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  */
190 int	  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  */
207 int	  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  */
222 int 	  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 */
226 int 	  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);
228 int 	  ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg);
229 void 	  *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  */
236 void 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
259