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@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@cryptsoft.com). This product includes software written by Tim 52 * Hudson (tjh@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|. It returns one on 109 * success and zero otherwise. */ 110 OPENSSL_EXPORT int EC_KEY_up_ref(EC_KEY *key); 111 112 /* EC_KEY_is_opaque returns one if |key| is opaque and doesn't expose its key 113 * material. Otherwise it return zero. */ 114 OPENSSL_EXPORT int EC_KEY_is_opaque(const EC_KEY *key); 115 116 /* EC_KEY_get0_group returns a pointer to the |EC_GROUP| object inside |key|. */ 117 OPENSSL_EXPORT const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key); 118 119 /* EC_KEY_set_group sets the |EC_GROUP| object that |key| will use to |group|. 120 * It returns one on success and zero otherwise. */ 121 OPENSSL_EXPORT int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group); 122 123 /* EC_KEY_get0_private_key returns a pointer to the private key inside |key|. */ 124 OPENSSL_EXPORT const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key); 125 126 /* EC_KEY_set_private_key sets the private key of |key| to |priv|. It returns 127 * one on success and zero otherwise. */ 128 OPENSSL_EXPORT int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *prv); 129 130 /* EC_KEY_get0_public_key returns a pointer to the public key point inside 131 * |key|. */ 132 OPENSSL_EXPORT const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key); 133 134 /* EC_KEY_set_public_key sets the public key of |key| to |pub|, by copying it. 135 * It returns one on success and zero otherwise. */ 136 OPENSSL_EXPORT int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub); 137 138 #define EC_PKEY_NO_PARAMETERS 0x001 139 #define EC_PKEY_NO_PUBKEY 0x002 140 141 /* EC_KEY_get_enc_flags returns the encoding flags for |key|, which is a 142 * bitwise-OR of |EC_PKEY_*| values. */ 143 OPENSSL_EXPORT unsigned EC_KEY_get_enc_flags(const EC_KEY *key); 144 145 /* EC_KEY_set_enc_flags sets the encoding flags for |key|, which is a 146 * bitwise-OR of |EC_PKEY_*| values. */ 147 OPENSSL_EXPORT void EC_KEY_set_enc_flags(EC_KEY *key, unsigned flags); 148 149 /* EC_KEY_get_conv_form returns the conversation form that will be used by 150 * |key|. */ 151 OPENSSL_EXPORT point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key); 152 153 /* EC_KEY_set_conv_form sets the conversion form to be used by |key|. */ 154 OPENSSL_EXPORT void EC_KEY_set_conv_form(EC_KEY *key, 155 point_conversion_form_t cform); 156 157 /* EC_KEY_check_key performs several checks on |key| (possibly including an 158 * expensive check that the public key is in the primary subgroup). It returns 159 * one if all checks pass and zero otherwise. If it returns zero then detail 160 * about the problem can be found on the error stack. */ 161 OPENSSL_EXPORT int EC_KEY_check_key(const EC_KEY *key); 162 163 /* EC_KEY_set_public_key_affine_coordinates sets the public key in |key| to 164 * (|x|, |y|). It returns one on success and zero otherwise. */ 165 OPENSSL_EXPORT int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, 166 BIGNUM *x, 167 BIGNUM *y); 168 169 170 /* Key generation. */ 171 172 /* EC_KEY_generate_key generates a random, private key, calculates the 173 * corresponding public key and stores both in |key|. It returns one on success 174 * or zero otherwise. */ 175 OPENSSL_EXPORT int EC_KEY_generate_key(EC_KEY *key); 176 177 178 /* Serialisation. */ 179 180 /* EC_KEY_parse_private_key parses a DER-encoded ECPrivateKey structure (RFC 181 * 5915) from |cbs| and advances |cbs|. It returns a newly-allocated |EC_KEY| or 182 * NULL on error. If |group| is non-null, the parameters field of the 183 * ECPrivateKey may be omitted (but must match |group| if present). Otherwise, 184 * the parameters field is required. */ 185 OPENSSL_EXPORT EC_KEY *EC_KEY_parse_private_key(CBS *cbs, 186 const EC_GROUP *group); 187 188 /* EC_KEY_marshal_private_key marshals |key| as a DER-encoded ECPrivateKey 189 * structure (RFC 5915) and appends the result to |cbb|. It returns one on 190 * success and zero on failure. |enc_flags| is a combination of |EC_PKEY_*| 191 * values and controls whether corresponding fields are omitted. */ 192 OPENSSL_EXPORT int EC_KEY_marshal_private_key(CBB *cbb, const EC_KEY *key, 193 unsigned enc_flags); 194 195 /* EC_KEY_parse_curve_name parses a DER-encoded OBJECT IDENTIFIER as a curve 196 * name from |cbs| and advances |cbs|. It returns a newly-allocated |EC_GROUP| 197 * or NULL on error. */ 198 OPENSSL_EXPORT EC_GROUP *EC_KEY_parse_curve_name(CBS *cbs); 199 200 /* EC_KEY_marshal_curve_name marshals |group| as a DER-encoded OBJECT IDENTIFIER 201 * and appends the result to |cbb|. It returns one on success and zero on 202 * failure. */ 203 OPENSSL_EXPORT int EC_KEY_marshal_curve_name(CBB *cbb, const EC_GROUP *group); 204 205 /* EC_KEY_parse_parameters parses a DER-encoded ECParameters structure (RFC 206 * 5480) from |cbs| and advances |cbs|. It returns a newly-allocated |EC_GROUP| 207 * or NULL on error. It supports the namedCurve and specifiedCurve options, but 208 * use of specifiedCurve is deprecated. Use |EC_KEY_parse_curve_name| 209 * instead. */ 210 OPENSSL_EXPORT EC_GROUP *EC_KEY_parse_parameters(CBS *cbs); 211 212 213 /* ex_data functions. 214 * 215 * These functions are wrappers. See |ex_data.h| for details. */ 216 217 OPENSSL_EXPORT int EC_KEY_get_ex_new_index(long argl, void *argp, 218 CRYPTO_EX_unused *unused, 219 CRYPTO_EX_dup *dup_func, 220 CRYPTO_EX_free *free_func); 221 OPENSSL_EXPORT int EC_KEY_set_ex_data(EC_KEY *r, int idx, void *arg); 222 OPENSSL_EXPORT void *EC_KEY_get_ex_data(const EC_KEY *r, int idx); 223 224 225 /* ECDSA method. */ 226 227 /* ECDSA_FLAG_OPAQUE specifies that this ECDSA_METHOD does not expose its key 228 * material. This may be set if, for instance, it is wrapping some other crypto 229 * API, like a platform key store. */ 230 #define ECDSA_FLAG_OPAQUE 1 231 232 /* ecdsa_method_st is a structure of function pointers for implementing ECDSA. 233 * See engine.h. */ 234 struct ecdsa_method_st { 235 struct openssl_method_common_st common; 236 237 void *app_data; 238 239 int (*init)(EC_KEY *key); 240 int (*finish)(EC_KEY *key); 241 242 /* group_order_size returns the number of bytes needed to represent the order 243 * of the group. This is used to calculate the maximum size of an ECDSA 244 * signature in |ECDSA_size|. */ 245 size_t (*group_order_size)(const EC_KEY *key); 246 247 /* sign matches the arguments and behaviour of |ECDSA_sign|. */ 248 int (*sign)(const uint8_t *digest, size_t digest_len, uint8_t *sig, 249 unsigned int *sig_len, EC_KEY *eckey); 250 251 /* Ignored. Set this to NULL. */ 252 int (*verify)(const uint8_t *digest, size_t digest_len, const uint8_t *sig, 253 size_t sig_len, EC_KEY *eckey); 254 255 int flags; 256 }; 257 258 259 /* Deprecated functions. */ 260 261 /* EC_KEY_set_asn1_flag does nothing. */ 262 OPENSSL_EXPORT void EC_KEY_set_asn1_flag(EC_KEY *key, int flag); 263 264 /* d2i_ECPrivateKey parses an ASN.1, DER-encoded, private key from |len| bytes 265 * at |*inp|. If |out_key| is not NULL then, on exit, a pointer to the result 266 * is in |*out_key|. Note that, even if |*out_key| is already non-NULL on entry, 267 * it * will not be written to. Rather, a fresh |EC_KEY| is allocated and the 268 * previous * one is freed. On successful exit, |*inp| is advanced past the DER 269 * structure. It returns the result or NULL on error. 270 * 271 * On input, if |*out_key| is non-NULL and has a group configured, the 272 * parameters field may be omitted but must match that group if present. 273 * 274 * Use |EC_KEY_parse_private_key| instead. */ 275 OPENSSL_EXPORT EC_KEY *d2i_ECPrivateKey(EC_KEY **out_key, const uint8_t **inp, 276 long len); 277 278 /* i2d_ECPrivateKey marshals an EC private key from |key| to an ASN.1, DER 279 * structure. If |outp| is not NULL then the result is written to |*outp| and 280 * |*outp| is advanced just past the output. It returns the number of bytes in 281 * the result, whether written or not, or a negative value on error. 282 * 283 * Use |EC_KEY_marshal_private_key| instead. */ 284 OPENSSL_EXPORT int i2d_ECPrivateKey(const EC_KEY *key, uint8_t **outp); 285 286 /* d2i_ECParameters parses an ASN.1, DER-encoded, set of EC parameters from 287 * |len| bytes at |*inp|. If |out_key| is not NULL then, on exit, a pointer to 288 * the result is in |*out_key|. Note that, even if |*out_key| is already 289 * non-NULL on entry, it will not be written to. Rather, a fresh |EC_KEY| is 290 * allocated and the previous one is freed. On successful exit, |*inp| is 291 * advanced past the DER structure. It returns the result or NULL on error. 292 * 293 * Use |EC_KEY_parse_parameters| or |EC_KEY_parse_curve_name| instead. */ 294 OPENSSL_EXPORT EC_KEY *d2i_ECParameters(EC_KEY **out_key, const uint8_t **inp, 295 long len); 296 297 /* i2d_ECParameters marshals EC parameters from |key| to an ASN.1, DER 298 * structure. If |outp| is not NULL then the result is written to |*outp| and 299 * |*outp| is advanced just past the output. It returns the number of bytes in 300 * the result, whether written or not, or a negative value on error. 301 * 302 * Use |EC_KEY_marshal_curve_name| instead. */ 303 OPENSSL_EXPORT int i2d_ECParameters(const EC_KEY *key, uint8_t **outp); 304 305 /* o2i_ECPublicKey parses an EC point from |len| bytes at |*inp| into 306 * |*out_key|. Note that this differs from the d2i format in that |*out_key| 307 * must be non-NULL with a group set. On successful exit, |*inp| is advanced by 308 * |len| bytes. It returns |*out_key| or NULL on error. 309 * 310 * Use |EC_POINT_oct2point| instead. */ 311 OPENSSL_EXPORT EC_KEY *o2i_ECPublicKey(EC_KEY **out_key, const uint8_t **inp, 312 long len); 313 314 /* i2o_ECPublicKey marshals an EC point from |key|. If |outp| is not NULL then 315 * the result is written to |*outp| and |*outp| is advanced just past the 316 * output. It returns the number of bytes in the result, whether written or 317 * not, or a negative value on error. 318 * 319 * Use |EC_POINT_point2cbb| instead. */ 320 OPENSSL_EXPORT int i2o_ECPublicKey(const EC_KEY *key, unsigned char **outp); 321 322 323 #if defined(__cplusplus) 324 } /* extern C */ 325 #endif 326 327 #endif /* OPENSSL_HEADER_EC_KEY_H */ 328