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>
64 #ifdef OPENSSL_NO_ECDSA
65 #error ECDSA is disabled.
68 #include <openssl/bn.h>
69 #include <openssl/ec.h>
70 #include <openssl/ossl_typ.h>
76 typedef struct ECDSA_SIG_st
82 typedef struct ecdsa_method
85 ECDSA_SIG *(*ecdsa_do_sign)(const unsigned char *dgst, int dgst_len,
87 int (*ecdsa_sign_setup)(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv,
89 int (*ecdsa_do_verify)(const unsigned char *dgst, int dgst_len,
90 ECDSA_SIG *sig, EC_KEY *eckey);
92 int (*init)(EC_KEY *eckey);
93 int (*finish)(EC_KEY *eckey);
99 typedef struct ecdsa_data_st {
100 /* EC_KEY_METH_DATA part */
101 int (*init)(EC_KEY *);
102 void (*finish)(EC_KEY *);
103 /* method (ECDSA) specific part */
104 BIGNUM *kinv; /* signing pre-calc */
105 BIGNUM *r; /* signing pre-calc */
108 const ECDSA_METHOD *meth;
109 CRYPTO_EX_DATA ex_data;
112 /** ECDSA_SIG *ECDSA_SIG_new(void)
113 * allocates and initialize a ECDSA_SIG structure
114 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
116 ECDSA_SIG *ECDSA_SIG_new(void);
119 * frees a ECDSA_SIG structure
120 * \param a pointer to the ECDSA_SIG structure
122 void ECDSA_SIG_free(ECDSA_SIG *a);
125 * DER encode content of ECDSA_SIG object (note: this function modifies *pp
126 * (*pp += length of the DER encoded signature)).
127 * \param a pointer to the ECDSA_SIG object
128 * \param pp pointer to a unsigned char pointer for the output or NULL
129 * \return the length of the DER encoded ECDSA_SIG object or 0
131 int i2d_ECDSA_SIG(const ECDSA_SIG *a, unsigned char **pp);
134 * decodes a DER encoded ECDSA signature (note: this function changes *pp
136 * \param v pointer to ECDSA_SIG pointer (may be NULL)
137 * \param pp buffer with the DER encoded signature
138 * \param len bufferlength
139 * \return pointer to the decoded ECDSA_SIG structure (or NULL)
141 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **v, const unsigned char **pp, long len);
144 * creates a new ECDSA_DATA object
145 * \return pointer to a newly allocated (and initialized) ECDSA_DATA object
147 ECDSA_DATA *ECDSA_DATA_new(void);
149 /** ECDSA_DATA_new_method
150 * creates a new ECDSA_DATA object using a specified ENGINE
151 * \param eng pointer to a ENGINE structure
152 * \return pointer to a newly allocated (and initialized) ECDSA_DATA object
154 ECDSA_DATA *ECDSA_DATA_new_method(ENGINE *eng);
157 * frees ECDSA_DATA structure
158 * \param data pointer to a ECDSA_DATA structure
160 void ECDSA_DATA_free(ECDSA_DATA *data);
163 * checks whether ECKEY->meth_data is a pointer to a ECDSA_DATA structure
164 * and if not it removes the old meth_data and creates a ECDSA_DATA structure.
165 * \param eckey pointer to a EC_KEY object
166 * \return pointer to a ECDSA_DATA structure
168 ECDSA_DATA *ecdsa_check(EC_KEY *eckey);
171 * computes the ECDSA signature of the given hash value using
172 * the supplied private key and returns the created signature.
173 * \param dgst pointer to the hash value
174 * \param dgst_len length of the hash value
175 * \param eckey pointer to the EC_KEY object containing a private EC key
176 * \return pointer to a ECDSA_SIG structure or NULL
178 ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst,int dgst_len,EC_KEY *eckey);
181 * verifies that the supplied signature is a valid ECDSA
182 * signature of the supplied hash value using the supplied public key.
183 * \param dgst pointer to the hash value
184 * \param dgst_len length of the hash value
185 * \param sig pointer to the ECDSA_SIG structure
186 * \param eckey pointer to the EC_KEY object containing a public EC key
187 * \return 1 if the signature is valid, 0 if the signature is invalid and -1 on error
189 int ECDSA_do_verify(const unsigned char *dgst, int dgst_len, ECDSA_SIG
190 *sig, EC_KEY* eckey);
192 const ECDSA_METHOD *ECDSA_OpenSSL(void);
194 /** ECDSA_set_default_method
195 * sets the default ECDSA method
196 * \param meth the new default ECDSA_METHOD
198 void ECDSA_set_default_method(const ECDSA_METHOD *meth);
200 /** ECDSA_get_default_method
201 * returns the default ECDSA method
202 * \return pointer to ECDSA_METHOD structure containing the default method
204 const ECDSA_METHOD *ECDSA_get_default_method(void);
207 * sets method to be used for the ECDSA operations
208 * \param eckey pointer to the EC_KEY object
209 * \param meth pointer to the new method
210 * \return 1 on success and 0 otherwise
212 int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth);
215 * returns the maximum length of the DER encoded signature
216 * \param eckey pointer to a EC_KEY object
217 * \return numbers of bytes required for the DER encoded signature
219 int ECDSA_size(const EC_KEY *eckey);
222 * precompute parts of the signing operation (the computed values may be
223 * passed to ECDSA_DATA->kinv and ECDSA_DATA->r for a later signature
225 * \param eckey pointer to the EC_KEY object containing a private EC key
226 * \param ctx pointer to a BN_CTX object (may be NULL)
227 * \param kinv pointer to a BIGNUM pointer for the inverse of k
228 * \param rp pointer to a BIGNUM pointer for x coordinate of k * generator
229 * \return 1 on success and 0 otherwise
231 int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv,
235 * computes ECDSA signature of a given hash value using the supplied
236 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
237 * \param type this parameter is ignored
238 * \param dgst pointer to the hash value to sign
239 * \param dgstlen length of the hash value
240 * \param sig buffer to hold the DER encoded signature
241 * \param siglen pointer to the length of the returned signature
242 * \param eckey pointer to the EC_KEY object containing a private EC key
243 * \return 1 on success and 0 otherwise
245 int ECDSA_sign(int type, const unsigned char *dgst, int dgstlen,
246 unsigned char *sig, unsigned int *siglen, EC_KEY *eckey);
249 * verifies that the given signature is valid ECDSA signature
250 * of the supplied hash value using the specified public key.
251 * \param type this parameter is ignored
252 * \param dgst pointer to the hash value
253 * \param dgstlen length of the hash value
254 * \param sig pointer to the DER encoded signature
255 * \param siglen length of the DER encoded signature
256 * \param eckey pointer to the EC_KEY object containing a public EC key
257 * \return 1 if the signature is valid, 0 if the signature is invalid and -1 on error
259 int ECDSA_verify(int type, const unsigned char *dgst, int dgstlen,
260 const unsigned char *sig, int siglen, EC_KEY *eckey);
262 /* the standard ex_data functions */
263 int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new
264 *new_func, CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
265 int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg);
266 void *ECDSA_get_ex_data(EC_KEY *d, int idx);
269 /* BEGIN ERROR CODES */
270 /* The following lines are auto generated by the script mkerr.pl. Any changes
271 * made after this point may be overwritten when the script is next run.
273 void ERR_load_ECDSA_strings(void);
275 /* Error codes for the ECDSA functions. */
277 /* Function codes. */
278 #define ECDSA_F_ECDSA_DATA_NEW 100
279 #define ECDSA_F_ECDSA_DO_SIGN 101
280 #define ECDSA_F_ECDSA_DO_VERIFY 102
281 #define ECDSA_F_ECDSA_SIGN_SETUP 103
284 #define ECDSA_R_BAD_SIGNATURE 100
285 #define ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 101
286 #define ECDSA_R_ERR_EC_LIB 102
287 #define ECDSA_R_MISSING_PARAMETERS 103
288 #define ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED 104
289 #define ECDSA_R_SIGNATURE_MALLOC_FAILED 105