1 /* crypto/ecdsa/ecdsa.h */
3 * \file crypto/ecdsa/ecdsa.h Include file for the OpenSSL ECDSA functions
4 * \author Written by Nils Larsch for the OpenSSL project
6 /* ====================================================================
7 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
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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).
59 #ifndef HEADER_ECDSA_H
60 # define HEADER_ECDSA_H
62 # include <openssl/opensslconf.h>
65 # error EC is disabled.
68 # include <openssl/ec.h>
69 # include <openssl/ossl_typ.h>
70 # ifdef OPENSSL_USE_DEPRECATED
71 # include <openssl/bn.h>
78 /** Computes the ECDSA signature of the given hash value using
79 * the supplied private key and returns the created signature.
80 * \param dgst pointer to the hash value
81 * \param dgst_len length of the hash value
82 * \param eckey EC_KEY object containing a private EC key
83 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
85 ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst, int dgst_len,
88 /** Computes ECDSA signature of a given hash value using the supplied
89 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
90 * \param dgst pointer to the hash value to sign
91 * \param dgstlen length of the hash value
92 * \param kinv BIGNUM with a pre-computed inverse k (optional)
93 * \param rp BIGNUM with a pre-computed rp value (optioanl),
94 * see ECDSA_sign_setup
95 * \param eckey EC_KEY object containing a private EC key
96 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
98 ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst, int dgstlen,
99 const BIGNUM *kinv, const BIGNUM *rp,
102 /** Verifies that the supplied signature is a valid ECDSA
103 * signature of the supplied hash value using the supplied public key.
104 * \param dgst pointer to the hash value
105 * \param dgst_len length of the hash value
106 * \param sig ECDSA_SIG structure
107 * \param eckey EC_KEY object containing a public EC key
108 * \return 1 if the signature is valid, 0 if the signature is invalid
111 int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
112 const ECDSA_SIG *sig, EC_KEY *eckey);
114 const ECDSA_METHOD *ECDSA_OpenSSL(void);
116 /** Sets the default ECDSA method
117 * \param meth new default ECDSA_METHOD
119 void ECDSA_set_default_method(const ECDSA_METHOD *meth);
121 /** Returns the default ECDSA method
122 * \return pointer to ECDSA_METHOD structure containing the default method
124 const ECDSA_METHOD *ECDSA_get_default_method(void);
126 /** Sets method to be used for the ECDSA operations
127 * \param eckey EC_KEY object
128 * \param meth new method
129 * \return 1 on success and 0 otherwise
131 int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth);
133 /** Returns the maximum length of the DER encoded signature
134 * \param eckey EC_KEY object
135 * \return numbers of bytes required for the DER encoded signature
137 int ECDSA_size(const EC_KEY *eckey);
139 /** Precompute parts of the signing operation
140 * \param eckey EC_KEY object containing a private EC key
141 * \param ctx BN_CTX object (optional)
142 * \param kinv BIGNUM pointer for the inverse of k
143 * \param rp BIGNUM pointer for x coordinate of k * generator
144 * \return 1 on success and 0 otherwise
146 int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv, BIGNUM **rp);
148 /** Computes ECDSA signature of a given hash value using the supplied
149 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
150 * \param type this parameter is ignored
151 * \param dgst pointer to the hash value to sign
152 * \param dgstlen length of the hash value
153 * \param sig memory for the DER encoded created signature
154 * \param siglen pointer to the length of the returned signature
155 * \param eckey EC_KEY object containing a private EC key
156 * \return 1 on success and 0 otherwise
158 int ECDSA_sign(int type, const unsigned char *dgst, int dgstlen,
159 unsigned char *sig, unsigned int *siglen, EC_KEY *eckey);
161 /** Computes ECDSA signature of a given hash value using the supplied
162 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
163 * \param type this parameter is ignored
164 * \param dgst pointer to the hash value to sign
165 * \param dgstlen length of the hash value
166 * \param sig buffer to hold the DER encoded signature
167 * \param siglen pointer to the length of the returned signature
168 * \param kinv BIGNUM with a pre-computed inverse k (optional)
169 * \param rp BIGNUM with a pre-computed rp value (optioanl),
170 * see ECDSA_sign_setup
171 * \param eckey EC_KEY object containing a private EC key
172 * \return 1 on success and 0 otherwise
174 int ECDSA_sign_ex(int type, const unsigned char *dgst, int dgstlen,
175 unsigned char *sig, unsigned int *siglen,
176 const BIGNUM *kinv, const BIGNUM *rp, EC_KEY *eckey);
178 /** Verifies that the given signature is valid ECDSA signature
179 * of the supplied hash value using the specified public key.
180 * \param type this parameter is ignored
181 * \param dgst pointer to the hash value
182 * \param dgstlen length of the hash value
183 * \param sig pointer to the DER encoded signature
184 * \param siglen length of the DER encoded signature
185 * \param eckey EC_KEY object containing a public EC key
186 * \return 1 if the signature is valid, 0 if the signature is invalid
189 int ECDSA_verify(int type, const unsigned char *dgst, int dgstlen,
190 const unsigned char *sig, int siglen, EC_KEY *eckey);
192 /* the standard ex_data functions */
193 #define ECDSA_get_ex_new_index(l, p, newf, dupf, freef) \
194 CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, l, p, newf, dupf, freef)
195 int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg);
196 void *ECDSA_get_ex_data(EC_KEY *d, int idx);
198 /** Allocates and initialize a ECDSA_METHOD structure
199 * \param ecdsa_method pointer to ECDSA_METHOD to copy. (May be NULL)
200 * \return pointer to a ECDSA_METHOD structure or NULL if an error occurred
203 ECDSA_METHOD *ECDSA_METHOD_new(const ECDSA_METHOD *ecdsa_method);
205 /** frees a ECDSA_METHOD structure
206 * \param ecdsa_method pointer to the ECDSA_METHOD structure
208 void ECDSA_METHOD_free(ECDSA_METHOD *ecdsa_method);
210 /** Sets application specific data in the ECDSA_METHOD
211 * \param ecdsa_method pointer to existing ECDSA_METHOD
212 * \param app application specific data to set
215 void ECDSA_METHOD_set_app_data(ECDSA_METHOD *ecdsa_method, void *app);
217 /** Returns application specific data from a ECDSA_METHOD structure
218 * \param ecdsa_method pointer to ECDSA_METHOD structure
219 * \return pointer to application specific data.
222 void *ECDSA_METHOD_get_app_data(ECDSA_METHOD *ecdsa_method);
224 /** Set the ECDSA_do_sign function in the ECDSA_METHOD
225 * \param ecdsa_method pointer to existing ECDSA_METHOD
226 * \param ecdsa_do_sign a funtion of type ECDSA_do_sign
229 void ECDSA_METHOD_set_sign(ECDSA_METHOD *ecdsa_method,
230 ECDSA_SIG *(*ecdsa_do_sign) (const unsigned char
236 /** Set the ECDSA_sign_setup function in the ECDSA_METHOD
237 * \param ecdsa_method pointer to existing ECDSA_METHOD
238 * \param ecdsa_sign_setup a funtion of type ECDSA_sign_setup
241 void ECDSA_METHOD_set_sign_setup(ECDSA_METHOD *ecdsa_method,
242 int (*ecdsa_sign_setup) (EC_KEY *eckey,
247 /** Set the ECDSA_do_verify function in the ECDSA_METHOD
248 * \param ecdsa_method pointer to existing ECDSA_METHOD
249 * \param ecdsa_do_verify a funtion of type ECDSA_do_verify
252 void ECDSA_METHOD_set_verify(ECDSA_METHOD *ecdsa_method,
253 int (*ecdsa_do_verify) (const unsigned char
255 const ECDSA_SIG *sig,
258 void ECDSA_METHOD_set_flags(ECDSA_METHOD *ecdsa_method, int flags);
260 /** Set the flags field in the ECDSA_METHOD
261 * \param ecdsa_method pointer to existing ECDSA_METHOD
262 * \param flags flags value to set
265 void ECDSA_METHOD_set_name(ECDSA_METHOD *ecdsa_method, char *name);
267 /** Set the name field in the ECDSA_METHOD
268 * \param ecdsa_method pointer to existing ECDSA_METHOD
269 * \param name name to set
272 /* BEGIN ERROR CODES */
274 * The following lines are auto generated by the script mkerr.pl. Any changes
275 * made after this point may be overwritten when the script is next run.
277 void ERR_load_ECDSA_strings(void);
279 /* Error codes for the ECDSA functions. */
281 /* Function codes. */
282 # define ECDSA_F_ECDSA_DATA_NEW_METHOD 100
283 # define ECDSA_F_ECDSA_DO_SIGN 101
284 # define ECDSA_F_ECDSA_DO_VERIFY 102
285 # define ECDSA_F_ECDSA_METHOD_NEW 105
286 # define ECDSA_F_ECDSA_SIGN_SETUP 103
289 # define ECDSA_R_BAD_SIGNATURE 100
290 # define ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 101
291 # define ECDSA_R_ERR_EC_LIB 102
292 # define ECDSA_R_MISSING_PARAMETERS 103
293 # define ECDSA_R_NEED_NEW_SETUP_VALUES 106
294 # define ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED 104
295 # define ECDSA_R_SIGNATURE_MALLOC_FAILED 105