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 /* ====================================================================
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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 /** Allocates and initialize a ECDSA_SIG structure
79 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
81 ECDSA_SIG *ECDSA_SIG_new(void);
83 /** frees a ECDSA_SIG structure
84 * \param sig pointer to the ECDSA_SIG structure
86 void ECDSA_SIG_free(ECDSA_SIG *sig);
88 /** DER encode content of ECDSA_SIG object (note: this function modifies *pp
89 * (*pp += length of the DER encoded signature)).
90 * \param sig pointer to the ECDSA_SIG object
91 * \param pp pointer to a unsigned char pointer for the output or NULL
92 * \return the length of the DER encoded ECDSA_SIG object or 0
94 int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **pp);
96 /** Decodes a DER encoded ECDSA signature (note: this function changes *pp
98 * \param sig pointer to ECDSA_SIG pointer (may be NULL)
99 * \param pp memory buffer with the DER encoded signature
100 * \param len length of the buffer
101 * \return pointer to the decoded ECDSA_SIG structure (or NULL)
103 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **sig, const unsigned char **pp, long len);
105 /** Computes the ECDSA signature of the given hash value using
106 * the supplied private key and returns the created signature.
107 * \param dgst pointer to the hash value
108 * \param dgst_len length of the hash value
109 * \param eckey EC_KEY object containing a private EC key
110 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
112 ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst, int dgst_len,
115 /** Computes ECDSA signature of a given hash value using the supplied
116 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
117 * \param dgst pointer to the hash value to sign
118 * \param dgstlen length of the hash value
119 * \param kinv BIGNUM with a pre-computed inverse k (optional)
120 * \param rp BIGNUM with a pre-computed rp value (optioanl),
121 * see ECDSA_sign_setup
122 * \param eckey EC_KEY object containing a private EC key
123 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
125 ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst, int dgstlen,
126 const BIGNUM *kinv, const BIGNUM *rp,
129 /** Verifies that the supplied signature is a valid ECDSA
130 * signature of the supplied hash value using the supplied public key.
131 * \param dgst pointer to the hash value
132 * \param dgst_len length of the hash value
133 * \param sig ECDSA_SIG structure
134 * \param eckey EC_KEY object containing a public EC key
135 * \return 1 if the signature is valid, 0 if the signature is invalid
138 int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
139 const ECDSA_SIG *sig, EC_KEY *eckey);
141 const ECDSA_METHOD *ECDSA_OpenSSL(void);
143 /** Sets the default ECDSA method
144 * \param meth new default ECDSA_METHOD
146 void ECDSA_set_default_method(const ECDSA_METHOD *meth);
148 /** Returns the default ECDSA method
149 * \return pointer to ECDSA_METHOD structure containing the default method
151 const ECDSA_METHOD *ECDSA_get_default_method(void);
153 /** Sets method to be used for the ECDSA operations
154 * \param eckey EC_KEY object
155 * \param meth new method
156 * \return 1 on success and 0 otherwise
158 int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth);
160 /** Returns the maximum length of the DER encoded signature
161 * \param eckey EC_KEY object
162 * \return numbers of bytes required for the DER encoded signature
164 int ECDSA_size(const EC_KEY *eckey);
166 /** Precompute parts of the signing operation
167 * \param eckey EC_KEY object containing a private EC key
168 * \param ctx BN_CTX object (optional)
169 * \param kinv BIGNUM pointer for the inverse of k
170 * \param rp BIGNUM pointer for x coordinate of k * generator
171 * \return 1 on success and 0 otherwise
173 int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv, BIGNUM **rp);
175 /** Computes ECDSA signature of a given hash value using the supplied
176 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
177 * \param type this parameter is ignored
178 * \param dgst pointer to the hash value to sign
179 * \param dgstlen length of the hash value
180 * \param sig memory for the DER encoded created signature
181 * \param siglen pointer to the length of the returned signature
182 * \param eckey EC_KEY object containing a private EC key
183 * \return 1 on success and 0 otherwise
185 int ECDSA_sign(int type, const unsigned char *dgst, int dgstlen,
186 unsigned char *sig, unsigned int *siglen, EC_KEY *eckey);
188 /** Computes ECDSA signature of a given hash value using the supplied
189 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
190 * \param type this parameter is ignored
191 * \param dgst pointer to the hash value to sign
192 * \param dgstlen length of the hash value
193 * \param sig buffer to hold the DER encoded signature
194 * \param siglen pointer to the length of the returned signature
195 * \param kinv BIGNUM with a pre-computed inverse k (optional)
196 * \param rp BIGNUM with a pre-computed rp value (optioanl),
197 * see ECDSA_sign_setup
198 * \param eckey EC_KEY object containing a private EC key
199 * \return 1 on success and 0 otherwise
201 int ECDSA_sign_ex(int type, const unsigned char *dgst, int dgstlen,
202 unsigned char *sig, unsigned int *siglen,
203 const BIGNUM *kinv, const BIGNUM *rp, EC_KEY *eckey);
205 /** Verifies that the given signature is valid ECDSA signature
206 * of the supplied hash value using the specified public key.
207 * \param type this parameter is ignored
208 * \param dgst pointer to the hash value
209 * \param dgstlen length of the hash value
210 * \param sig pointer to the DER encoded signature
211 * \param siglen length of the DER encoded signature
212 * \param eckey EC_KEY object containing a public EC key
213 * \return 1 if the signature is valid, 0 if the signature is invalid
216 int ECDSA_verify(int type, const unsigned char *dgst, int dgstlen,
217 const unsigned char *sig, int siglen, EC_KEY *eckey);
219 /* the standard ex_data functions */
220 #define ECDSA_get_ex_new_index(l, p, newf, dupf, freef) \
221 CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, l, p, newf, dupf, freef)
222 int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg);
223 void *ECDSA_get_ex_data(EC_KEY *d, int idx);
225 /** Allocates and initialize a ECDSA_METHOD structure
226 * \param ecdsa_method pointer to ECDSA_METHOD to copy. (May be NULL)
227 * \return pointer to a ECDSA_METHOD structure or NULL if an error occurred
230 ECDSA_METHOD *ECDSA_METHOD_new(const ECDSA_METHOD *ecdsa_method);
232 /** frees a ECDSA_METHOD structure
233 * \param ecdsa_method pointer to the ECDSA_METHOD structure
235 void ECDSA_METHOD_free(ECDSA_METHOD *ecdsa_method);
237 /** Sets application specific data in the ECDSA_METHOD
238 * \param ecdsa_method pointer to existing ECDSA_METHOD
239 * \param app application specific data to set
242 void ECDSA_METHOD_set_app_data(ECDSA_METHOD *ecdsa_method, void *app);
244 /** Returns application specific data from a ECDSA_METHOD structure
245 * \param ecdsa_method pointer to ECDSA_METHOD structure
246 * \return pointer to application specific data.
249 void *ECDSA_METHOD_get_app_data(ECDSA_METHOD *ecdsa_method);
251 /** Set the ECDSA_do_sign function in the ECDSA_METHOD
252 * \param ecdsa_method pointer to existing ECDSA_METHOD
253 * \param ecdsa_do_sign a funtion of type ECDSA_do_sign
256 void ECDSA_METHOD_set_sign(ECDSA_METHOD *ecdsa_method,
257 ECDSA_SIG *(*ecdsa_do_sign) (const unsigned char
263 /** Set the ECDSA_sign_setup function in the ECDSA_METHOD
264 * \param ecdsa_method pointer to existing ECDSA_METHOD
265 * \param ecdsa_sign_setup a funtion of type ECDSA_sign_setup
268 void ECDSA_METHOD_set_sign_setup(ECDSA_METHOD *ecdsa_method,
269 int (*ecdsa_sign_setup) (EC_KEY *eckey,
274 /** Set the ECDSA_do_verify function in the ECDSA_METHOD
275 * \param ecdsa_method pointer to existing ECDSA_METHOD
276 * \param ecdsa_do_verify a funtion of type ECDSA_do_verify
279 void ECDSA_METHOD_set_verify(ECDSA_METHOD *ecdsa_method,
280 int (*ecdsa_do_verify) (const unsigned char
282 const ECDSA_SIG *sig,
285 void ECDSA_METHOD_set_flags(ECDSA_METHOD *ecdsa_method, int flags);
287 /** Set the flags field in the ECDSA_METHOD
288 * \param ecdsa_method pointer to existing ECDSA_METHOD
289 * \param flags flags value to set
292 void ECDSA_METHOD_set_name(ECDSA_METHOD *ecdsa_method, char *name);
294 /** Set the name field in the ECDSA_METHOD
295 * \param ecdsa_method pointer to existing ECDSA_METHOD
296 * \param name name to set
299 /* BEGIN ERROR CODES */
301 * The following lines are auto generated by the script mkerr.pl. Any changes
302 * made after this point may be overwritten when the script is next run.
304 void ERR_load_ECDSA_strings(void);
306 /* Error codes for the ECDSA functions. */
308 /* Function codes. */
309 # define ECDSA_F_ECDSA_DATA_NEW_METHOD 100
310 # define ECDSA_F_ECDSA_DO_SIGN 101
311 # define ECDSA_F_ECDSA_DO_VERIFY 102
312 # define ECDSA_F_ECDSA_METHOD_NEW 105
313 # define ECDSA_F_ECDSA_SIGN_SETUP 103
316 # define ECDSA_R_BAD_SIGNATURE 100
317 # define ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 101
318 # define ECDSA_R_ERR_EC_LIB 102
319 # define ECDSA_R_MISSING_PARAMETERS 103
320 # define ECDSA_R_NEED_NEW_SETUP_VALUES 106
321 # define ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED 104
322 # define ECDSA_R_SIGNATURE_MALLOC_FAILED 105