1 /* $OpenBSD: ecdsa.h,v 1.8 2019/01/19 01:17:41 tb Exp $ */
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/ec.h>
69 #include <openssl/ossl_typ.h>
70 #ifndef OPENSSL_NO_DEPRECATED
71 #include <openssl/bn.h>
78 typedef struct ECDSA_SIG_st ECDSA_SIG;
82 ECDSA_SIG *(*ecdsa_do_sign)(const unsigned char *dgst, int dgst_len,
83 const BIGNUM *inv, const BIGNUM *rp, EC_KEY *eckey);
84 int (*ecdsa_sign_setup)(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv,
86 int (*ecdsa_do_verify)(const unsigned char *dgst, int dgst_len,
87 const ECDSA_SIG *sig, EC_KEY *eckey);
89 int (*init)(EC_KEY *eckey);
90 int (*finish)(EC_KEY *eckey);
96 /* If this flag is set the ECDSA method is FIPS compliant and can be used
97 * in FIPS mode. This is set in the validated module method. If an
98 * application sets this flag in its own methods it is its responsibility
99 * to ensure the result is compliant.
102 #define ECDSA_FLAG_FIPS_METHOD 0x1
104 struct ECDSA_SIG_st {
109 /** Allocates and initialize a ECDSA_SIG structure
110 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
112 ECDSA_SIG *ECDSA_SIG_new(void);
114 /** frees a ECDSA_SIG structure
115 * \param sig pointer to the ECDSA_SIG structure
117 void ECDSA_SIG_free(ECDSA_SIG *sig);
119 /** DER encode content of ECDSA_SIG object (note: this function modifies *pp
120 * (*pp += length of the DER encoded signature)).
121 * \param sig pointer to the ECDSA_SIG object
122 * \param pp pointer to a unsigned char pointer for the output or NULL
123 * \return the length of the DER encoded ECDSA_SIG object or 0
125 int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **pp);
127 /** Decodes a DER encoded ECDSA signature (note: this function changes *pp
129 * \param sig pointer to ECDSA_SIG pointer (may be NULL)
130 * \param pp memory buffer with the DER encoded signature
131 * \param len length of the buffer
132 * \return pointer to the decoded ECDSA_SIG structure (or NULL)
134 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **sig, const unsigned char **pp, long len);
136 /** Accessor for r and s fields of ECDSA_SIG
137 * \param sig pointer to ECDSA_SIG pointer
138 * \param pr pointer to BIGNUM pointer for r (may be NULL)
139 * \param ps pointer to BIGNUM pointer for s (may be NULL)
141 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps);
143 /** Setter for r and s fields of ECDSA_SIG
144 * \param sig pointer to ECDSA_SIG pointer
145 * \param r pointer to BIGNUM for r (may be NULL)
146 * \param s pointer to BIGNUM for s (may be NULL)
148 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s);
150 /** Computes the ECDSA signature of the given hash value using
151 * the supplied private key and returns the created signature.
152 * \param dgst pointer to the hash value
153 * \param dgst_len length of the hash value
154 * \param eckey EC_KEY object containing a private EC key
155 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
157 ECDSA_SIG *ECDSA_do_sign(const unsigned char *dgst, int dgst_len,
160 /** Computes ECDSA signature of a given hash value using the supplied
161 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
162 * \param dgst pointer to the hash value to sign
163 * \param dgstlen length of the hash value
164 * \param kinv BIGNUM with a pre-computed inverse k (optional)
165 * \param rp BIGNUM with a pre-computed rp value (optioanl),
166 * see ECDSA_sign_setup
167 * \param eckey EC_KEY object containing a private EC key
168 * \return pointer to a ECDSA_SIG structure or NULL if an error occurred
170 ECDSA_SIG *ECDSA_do_sign_ex(const unsigned char *dgst, int dgstlen,
171 const BIGNUM *kinv, const BIGNUM *rp, EC_KEY *eckey);
173 /** Verifies that the supplied signature is a valid ECDSA
174 * signature of the supplied hash value using the supplied public key.
175 * \param dgst pointer to the hash value
176 * \param dgst_len length of the hash value
177 * \param sig ECDSA_SIG structure
178 * \param eckey EC_KEY object containing a public EC key
179 * \return 1 if the signature is valid, 0 if the signature is invalid
182 int ECDSA_do_verify(const unsigned char *dgst, int dgst_len,
183 const ECDSA_SIG *sig, EC_KEY* eckey);
185 const ECDSA_METHOD *ECDSA_OpenSSL(void);
187 /** Sets the default ECDSA method
188 * \param meth new default ECDSA_METHOD
190 void ECDSA_set_default_method(const ECDSA_METHOD *meth);
192 /** Returns the default ECDSA method
193 * \return pointer to ECDSA_METHOD structure containing the default method
195 const ECDSA_METHOD *ECDSA_get_default_method(void);
197 /** Sets method to be used for the ECDSA operations
198 * \param eckey EC_KEY object
199 * \param meth new method
200 * \return 1 on success and 0 otherwise
202 int ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth);
204 /** Returns the maximum length of the DER encoded signature
205 * \param eckey EC_KEY object
206 * \return numbers of bytes required for the DER encoded signature
208 int ECDSA_size(const EC_KEY *eckey);
210 /** Precompute parts of the signing operation
211 * \param eckey EC_KEY object containing a private EC key
212 * \param ctx BN_CTX object (optional)
213 * \param kinv BIGNUM pointer for the inverse of k
214 * \param rp BIGNUM pointer for x coordinate of k * generator
215 * \return 1 on success and 0 otherwise
217 int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv,
220 /** Computes ECDSA signature of a given hash value using the supplied
221 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
222 * \param type this parameter is ignored
223 * \param dgst pointer to the hash value to sign
224 * \param dgstlen length of the hash value
225 * \param sig memory for the DER encoded created signature
226 * \param siglen pointer to the length of the returned signature
227 * \param eckey EC_KEY object containing a private EC key
228 * \return 1 on success and 0 otherwise
230 int ECDSA_sign(int type, const unsigned char *dgst, int dgstlen,
231 unsigned char *sig, unsigned int *siglen, EC_KEY *eckey);
234 /** Computes ECDSA signature of a given hash value using the supplied
235 * private key (note: sig must point to ECDSA_size(eckey) bytes of memory).
236 * \param type this parameter is ignored
237 * \param dgst pointer to the hash value to sign
238 * \param dgstlen length of the hash value
239 * \param sig buffer to hold the DER encoded signature
240 * \param siglen pointer to the length of the returned signature
241 * \param kinv BIGNUM with a pre-computed inverse k (optional)
242 * \param rp BIGNUM with a pre-computed rp value (optioanl),
243 * see ECDSA_sign_setup
244 * \param eckey EC_KEY object containing a private EC key
245 * \return 1 on success and 0 otherwise
247 int ECDSA_sign_ex(int type, const unsigned char *dgst, int dgstlen,
248 unsigned char *sig, unsigned int *siglen, const BIGNUM *kinv,
249 const BIGNUM *rp, EC_KEY *eckey);
251 /** Verifies that the given signature is valid ECDSA signature
252 * of the supplied hash value using the specified public key.
253 * \param type this parameter is ignored
254 * \param dgst pointer to the hash value
255 * \param dgstlen length of the hash value
256 * \param sig pointer to the DER encoded signature
257 * \param siglen length of the DER encoded signature
258 * \param eckey EC_KEY object containing a public EC key
259 * \return 1 if the signature is valid, 0 if the signature is invalid
262 int ECDSA_verify(int type, const unsigned char *dgst, int dgstlen,
263 const unsigned char *sig, int siglen, EC_KEY *eckey);
265 /* the standard ex_data functions */
266 int ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
267 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
268 int ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg);
269 void *ECDSA_get_ex_data(EC_KEY *d, int idx);
272 /* XXX should be in ec.h, but needs ECDSA_SIG */
273 void EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,
274 int (*sign)(int type, const unsigned char *dgst,
275 int dlen, unsigned char *sig, unsigned int *siglen,
276 const BIGNUM *kinv, const BIGNUM *r, EC_KEY *eckey),
277 int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
278 BIGNUM **kinvp, BIGNUM **rp),
279 ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
280 int dgst_len, const BIGNUM *in_kinv, const BIGNUM *in_r,
282 void EC_KEY_METHOD_set_verify(EC_KEY_METHOD *meth,
283 int (*verify)(int type, const unsigned char *dgst, int dgst_len,
284 const unsigned char *sigbuf, int sig_len, EC_KEY *eckey),
285 int (*verify_sig)(const unsigned char *dgst, int dgst_len,
286 const ECDSA_SIG *sig, EC_KEY *eckey));
287 void EC_KEY_METHOD_get_sign(const EC_KEY_METHOD *meth,
288 int (**psign)(int type, const unsigned char *dgst,
289 int dlen, unsigned char *sig, unsigned int *siglen,
290 const BIGNUM *kinv, const BIGNUM *r, EC_KEY *eckey),
291 int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
292 BIGNUM **kinvp, BIGNUM **rp),
293 ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
294 int dgst_len, const BIGNUM *in_kinv, const BIGNUM *in_r,
296 void EC_KEY_METHOD_get_verify(const EC_KEY_METHOD *meth,
297 int (**pverify)(int type, const unsigned char *dgst, int dgst_len,
298 const unsigned char *sigbuf, int sig_len, EC_KEY *eckey),
299 int (**pverify_sig)(const unsigned char *dgst, int dgst_len,
300 const ECDSA_SIG *sig, EC_KEY *eckey));
303 /* BEGIN ERROR CODES */
304 /* The following lines are auto generated by the script mkerr.pl. Any changes
305 * made after this point may be overwritten when the script is next run.
307 void ERR_load_ECDSA_strings(void);
309 /* Error codes for the ECDSA functions. */
311 /* Function codes. */
312 #define ECDSA_F_ECDSA_CHECK 104
313 #define ECDSA_F_ECDSA_DATA_NEW_METHOD 100
314 #define ECDSA_F_ECDSA_DO_SIGN 101
315 #define ECDSA_F_ECDSA_DO_VERIFY 102
316 #define ECDSA_F_ECDSA_SIGN_SETUP 103
319 #define ECDSA_R_BAD_SIGNATURE 100
320 #define ECDSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 101
321 #define ECDSA_R_ERR_EC_LIB 102
322 #define ECDSA_R_MISSING_PARAMETERS 103
323 #define ECDSA_R_NEED_NEW_SETUP_VALUES 106
324 #define ECDSA_R_NON_FIPS_METHOD 107
325 #define ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED 104
326 #define ECDSA_R_SIGNATURE_MALLOC_FAILED 105