1 /* Originally written by Bodo Moeller for the OpenSSL project. 2 * ==================================================================== 3 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the 15 * distribution. 16 * 17 * 3. All advertising materials mentioning features or use of this 18 * software must display the following acknowledgment: 19 * "This product includes software developed by the OpenSSL Project 20 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 21 * 22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 23 * endorse or promote products derived from this software without 24 * prior written permission. For written permission, please contact 25 * openssl-core (at) openssl.org. 26 * 27 * 5. Products derived from this software may not be called "OpenSSL" 28 * nor may "OpenSSL" appear in their names without prior written 29 * permission of the OpenSSL Project. 30 * 31 * 6. Redistributions of any form whatsoever must retain the following 32 * acknowledgment: 33 * "This product includes software developed by the OpenSSL Project 34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 47 * OF THE POSSIBILITY OF SUCH DAMAGE. 48 * ==================================================================== 49 * 50 * This product includes cryptographic software written by Eric Young 51 * (eay (at) cryptsoft.com). This product includes software written by Tim 52 * Hudson (tjh (at) cryptsoft.com). 53 * 54 */ 55 /* ==================================================================== 56 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 57 * 58 * Portions of the attached software ("Contribution") are developed by 59 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 60 * 61 * The Contribution is licensed pursuant to the OpenSSL open source 62 * license provided above. 63 * 64 * The elliptic curve binary polynomial software is originally written by 65 * Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems 66 * Laboratories. */ 67 68 #ifndef OPENSSL_HEADER_EC_KEY_H 69 #define OPENSSL_HEADER_EC_KEY_H 70 71 #include <openssl/base.h> 72 73 #include <openssl/ec.h> 74 #include <openssl/engine.h> 75 #include <openssl/ex_data.h> 76 77 #if defined(__cplusplus) 78 extern "C" { 79 #endif 80 81 82 /* ec_key.h contains functions that handle elliptic-curve points that are 83 * public/private keys. */ 84 85 86 /* EC key objects. */ 87 88 /* EC_KEY_new returns a fresh |EC_KEY| object or NULL on error. */ 89 OPENSSL_EXPORT EC_KEY *EC_KEY_new(void); 90 91 /* EC_KEY_new_method acts the same as |EC_KEY_new|, but takes an explicit 92 * |ENGINE|. */ 93 OPENSSL_EXPORT EC_KEY *EC_KEY_new_method(const ENGINE *engine); 94 95 /* EC_KEY_new_by_curve_name returns a fresh EC_KEY for group specified by |nid| 96 * or NULL on error. */ 97 OPENSSL_EXPORT EC_KEY *EC_KEY_new_by_curve_name(int nid); 98 99 /* EC_KEY_free frees all the data owned by |key| and |key| itself. */ 100 OPENSSL_EXPORT void EC_KEY_free(EC_KEY *key); 101 102 /* EC_KEY_copy sets |dst| equal to |src| and returns |dst| or NULL on error. */ 103 OPENSSL_EXPORT EC_KEY *EC_KEY_copy(EC_KEY *dst, const EC_KEY *src); 104 105 /* EC_KEY_dup returns a fresh copy of |src| or NULL on error. */ 106 OPENSSL_EXPORT EC_KEY *EC_KEY_dup(const EC_KEY *src); 107 108 /* EC_KEY_up_ref increases the reference count of |key| and returns one. */ 109 OPENSSL_EXPORT int EC_KEY_up_ref(EC_KEY *key); 110 111 /* EC_KEY_is_opaque returns one if |key| is opaque and doesn't expose its key 112 * material. Otherwise it return zero. */ 113 OPENSSL_EXPORT int EC_KEY_is_opaque(const EC_KEY *key); 114 115 /* EC_KEY_get0_group returns a pointer to the |EC_GROUP| object inside |key|. */ 116 OPENSSL_EXPORT const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key); 117 118 /* EC_KEY_set_group sets the |EC_GROUP| object that |key| will use to |group|. 119 * It returns one on success and zero otherwise. */ 120 OPENSSL_EXPORT int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group); 121 122 /* EC_KEY_get0_private_key returns a pointer to the private key inside |key|. */ 123 OPENSSL_EXPORT const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key); 124 125 /* EC_KEY_set_private_key sets the private key of |key| to |priv|. It returns 126 * one on success and zero otherwise. */ 127 OPENSSL_EXPORT int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *prv); 128 129 /* EC_KEY_get0_public_key returns a pointer to the public key point inside 130 * |key|. */ 131 OPENSSL_EXPORT const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key); 132 133 /* EC_KEY_set_public_key sets the public key of |key| to |pub|, by copying it. 134 * It returns one on success and zero otherwise. */ 135 OPENSSL_EXPORT int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub); 136 137 #define EC_PKEY_NO_PARAMETERS 0x001 138 #define EC_PKEY_NO_PUBKEY 0x002 139 140 /* EC_KEY_get_enc_flags returns the encoding flags for |key|, which is a 141 * bitwise-OR of |EC_PKEY_*| values. */ 142 OPENSSL_EXPORT unsigned EC_KEY_get_enc_flags(const EC_KEY *key); 143 144 /* EC_KEY_set_enc_flags sets the encoding flags for |key|, which is a 145 * bitwise-OR of |EC_PKEY_*| values. */ 146 OPENSSL_EXPORT void EC_KEY_set_enc_flags(EC_KEY *key, unsigned flags); 147 148 /* EC_KEY_get_conv_form returns the conversation form that will be used by 149 * |key|. */ 150 OPENSSL_EXPORT point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key); 151 152 /* EC_KEY_set_conv_form sets the conversion form to be used by |key|. */ 153 OPENSSL_EXPORT void EC_KEY_set_conv_form(EC_KEY *key, 154 point_conversion_form_t cform); 155 156 /* EC_KEY_check_key performs several checks on |key| (possibly including an 157 * expensive check that the public key is in the primary subgroup). It returns 158 * one if all checks pass and zero otherwise. If it returns zero then detail 159 * about the problem can be found on the error stack. */ 160 OPENSSL_EXPORT int EC_KEY_check_key(const EC_KEY *key); 161 162 /* EC_KEY_set_public_key_affine_coordinates sets the public key in |key| to 163 * (|x|, |y|). It returns one on success and zero otherwise. */ 164 OPENSSL_EXPORT int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, 165 BIGNUM *x, 166 BIGNUM *y); 167 168 169 /* Key generation. */ 170 171 /* EC_KEY_generate_key generates a random, private key, calculates the 172 * corresponding public key and stores both in |key|. It returns one on success 173 * or zero otherwise. */ 174 OPENSSL_EXPORT int EC_KEY_generate_key(EC_KEY *key); 175 176 177 /* Serialisation. */ 178 179 /* EC_KEY_parse_private_key parses a DER-encoded ECPrivateKey structure (RFC 180 * 5915) from |cbs| and advances |cbs|. It returns a newly-allocated |EC_KEY| or 181 * NULL on error. If |group| is non-null, the parameters field of the 182 * ECPrivateKey may be omitted (but must match |group| if present). Otherwise, 183 * the parameters field is required. */ 184 OPENSSL_EXPORT EC_KEY *EC_KEY_parse_private_key(CBS *cbs, 185 const EC_GROUP *group); 186 187 /* EC_KEY_marshal_private_key marshals |key| as a DER-encoded ECPrivateKey 188 * structure (RFC 5915) and appends the result to |cbb|. It returns one on 189 * success and zero on failure. |enc_flags| is a combination of |EC_PKEY_*| 190 * values and controls whether corresponding fields are omitted. */ 191 OPENSSL_EXPORT int EC_KEY_marshal_private_key(CBB *cbb, const EC_KEY *key, 192 unsigned enc_flags); 193 194 /* EC_KEY_parse_curve_name parses a DER-encoded OBJECT IDENTIFIER as a curve 195 * name from |cbs| and advances |cbs|. It returns a newly-allocated |EC_GROUP| 196 * or NULL on error. */ 197 OPENSSL_EXPORT EC_GROUP *EC_KEY_parse_curve_name(CBS *cbs); 198 199 /* EC_KEY_marshal_curve_name marshals |group| as a DER-encoded OBJECT IDENTIFIER 200 * and appends the result to |cbb|. It returns one on success and zero on 201 * failure. */ 202 OPENSSL_EXPORT int EC_KEY_marshal_curve_name(CBB *cbb, const EC_GROUP *group); 203 204 /* EC_KEY_parse_parameters parses a DER-encoded ECParameters structure (RFC 205 * 5480) from |cbs| and advances |cbs|. It returns a newly-allocated |EC_GROUP| 206 * or NULL on error. It supports the namedCurve and specifiedCurve options, but 207 * use of specifiedCurve is deprecated. Use |EC_KEY_parse_curve_name| 208 * instead. */ 209 OPENSSL_EXPORT EC_GROUP *EC_KEY_parse_parameters(CBS *cbs); 210 211 212 /* ex_data functions. 213 * 214 * These functions are wrappers. See |ex_data.h| for details. */ 215 216 OPENSSL_EXPORT int EC_KEY_get_ex_new_index(long argl, void *argp, 217 CRYPTO_EX_unused *unused, 218 CRYPTO_EX_dup *dup_func, 219 CRYPTO_EX_free *free_func); 220 OPENSSL_EXPORT int EC_KEY_set_ex_data(EC_KEY *r, int idx, void *arg); 221 OPENSSL_EXPORT void *EC_KEY_get_ex_data(const EC_KEY *r, int idx); 222 223 224 /* ECDSA method. */ 225 226 /* ECDSA_FLAG_OPAQUE specifies that this ECDSA_METHOD does not expose its key 227 * material. This may be set if, for instance, it is wrapping some other crypto 228 * API, like a platform key store. */ 229 #define ECDSA_FLAG_OPAQUE 1 230 231 /* ecdsa_method_st is a structure of function pointers for implementing ECDSA. 232 * See engine.h. */ 233 struct ecdsa_method_st { 234 struct openssl_method_common_st common; 235 236 void *app_data; 237 238 int (*init)(EC_KEY *key); 239 int (*finish)(EC_KEY *key); 240 241 /* group_order_size returns the number of bytes needed to represent the order 242 * of the group. This is used to calculate the maximum size of an ECDSA 243 * signature in |ECDSA_size|. */ 244 size_t (*group_order_size)(const EC_KEY *key); 245 246 /* sign matches the arguments and behaviour of |ECDSA_sign|. */ 247 int (*sign)(const uint8_t *digest, size_t digest_len, uint8_t *sig, 248 unsigned int *sig_len, EC_KEY *eckey); 249 250 /* Ignored. Set this to NULL. */ 251 int (*verify)(const uint8_t *digest, size_t digest_len, const uint8_t *sig, 252 size_t sig_len, EC_KEY *eckey); 253 254 int flags; 255 }; 256 257 258 /* Deprecated functions. */ 259 260 /* EC_KEY_set_asn1_flag does nothing. */ 261 OPENSSL_EXPORT void EC_KEY_set_asn1_flag(EC_KEY *key, int flag); 262 263 /* d2i_ECPrivateKey parses an ASN.1, DER-encoded, private key from |len| bytes 264 * at |*inp|. If |out_key| is not NULL then, on exit, a pointer to the result 265 * is in |*out_key|. Note that, even if |*out_key| is already non-NULL on entry, 266 * it * will not be written to. Rather, a fresh |EC_KEY| is allocated and the 267 * previous * one is freed. On successful exit, |*inp| is advanced past the DER 268 * structure. It returns the result or NULL on error. 269 * 270 * On input, if |*out_key| is non-NULL and has a group configured, the 271 * parameters field may be omitted but must match that group if present. 272 * 273 * Use |EC_KEY_parse_private_key| instead. */ 274 OPENSSL_EXPORT EC_KEY *d2i_ECPrivateKey(EC_KEY **out_key, const uint8_t **inp, 275 long len); 276 277 /* i2d_ECPrivateKey marshals an EC private key from |key| to an ASN.1, DER 278 * structure. If |outp| is not NULL then the result is written to |*outp| and 279 * |*outp| is advanced just past the output. It returns the number of bytes in 280 * the result, whether written or not, or a negative value on error. 281 * 282 * Use |EC_KEY_marshal_private_key| instead. */ 283 OPENSSL_EXPORT int i2d_ECPrivateKey(const EC_KEY *key, uint8_t **outp); 284 285 /* d2i_ECParameters parses an ASN.1, DER-encoded, set of EC parameters from 286 * |len| bytes at |*inp|. If |out_key| is not NULL then, on exit, a pointer to 287 * the result is in |*out_key|. Note that, even if |*out_key| is already 288 * non-NULL on entry, it will not be written to. Rather, a fresh |EC_KEY| is 289 * allocated and the previous one is freed. On successful exit, |*inp| is 290 * advanced past the DER structure. It returns the result or NULL on error. 291 * 292 * Use |EC_KEY_parse_parameters| or |EC_KEY_parse_curve_name| instead. */ 293 OPENSSL_EXPORT EC_KEY *d2i_ECParameters(EC_KEY **out_key, const uint8_t **inp, 294 long len); 295 296 /* i2d_ECParameters marshals EC parameters from |key| to an ASN.1, DER 297 * structure. If |outp| is not NULL then the result is written to |*outp| and 298 * |*outp| is advanced just past the output. It returns the number of bytes in 299 * the result, whether written or not, or a negative value on error. 300 * 301 * Use |EC_KEY_marshal_curve_name| instead. */ 302 OPENSSL_EXPORT int i2d_ECParameters(const EC_KEY *key, uint8_t **outp); 303 304 /* o2i_ECPublicKey parses an EC point from |len| bytes at |*inp| into 305 * |*out_key|. Note that this differs from the d2i format in that |*out_key| 306 * must be non-NULL with a group set. On successful exit, |*inp| is advanced by 307 * |len| bytes. It returns |*out_key| or NULL on error. 308 * 309 * Use |EC_POINT_oct2point| instead. */ 310 OPENSSL_EXPORT EC_KEY *o2i_ECPublicKey(EC_KEY **out_key, const uint8_t **inp, 311 long len); 312 313 /* i2o_ECPublicKey marshals an EC point from |key|. If |outp| is not NULL then 314 * the result is written to |*outp| and |*outp| is advanced just past the 315 * output. It returns the number of bytes in the result, whether written or 316 * not, or a negative value on error. 317 * 318 * Use |EC_POINT_point2cbb| instead. */ 319 OPENSSL_EXPORT int i2o_ECPublicKey(const EC_KEY *key, unsigned char **outp); 320 321 322 #if defined(__cplusplus) 323 } /* extern C */ 324 325 extern "C++" { 326 327 namespace bssl { 328 329 BORINGSSL_MAKE_DELETER(EC_KEY, EC_KEY_free) 330 331 } // namespace bssl 332 333 } /* extern C++ */ 334 335 #endif 336 337 #endif /* OPENSSL_HEADER_EC_KEY_H */ 338
