1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #ifndef OPENSSL_HEADER_EVP_H 58 #define OPENSSL_HEADER_EVP_H 59 60 #include <openssl/base.h> 61 62 #include <openssl/thread.h> 63 64 /* OpenSSL included digest and cipher functions in this header so we include 65 * them for users that still expect that. 66 * 67 * TODO(fork): clean up callers so that they include what they use. */ 68 #include <openssl/aead.h> 69 #include <openssl/base64.h> 70 #include <openssl/cipher.h> 71 #include <openssl/digest.h> 72 #include <openssl/obj.h> 73 74 #if defined(__cplusplus) 75 extern "C" { 76 #endif 77 78 79 /* EVP abstracts over public/private key algorithms. */ 80 81 82 /* Public key objects. */ 83 84 /* EVP_PKEY_new creates a new, empty public-key object and returns it or NULL 85 * on allocation failure. */ 86 OPENSSL_EXPORT EVP_PKEY *EVP_PKEY_new(void); 87 88 /* EVP_PKEY_free frees all data referenced by |pkey| and then frees |pkey| 89 * itself. */ 90 OPENSSL_EXPORT void EVP_PKEY_free(EVP_PKEY *pkey); 91 92 /* EVP_PKEY_up_ref increments the reference count of |pkey| and returns it. */ 93 OPENSSL_EXPORT EVP_PKEY *EVP_PKEY_up_ref(EVP_PKEY *pkey); 94 95 /* EVP_PKEY_is_opaque returns one if |pkey| is opaque. Opaque keys are backed by 96 * custom implementations which do not expose key material and parameters. It is 97 * an error to attempt to duplicate, export, or compare an opaque key. */ 98 OPENSSL_EXPORT int EVP_PKEY_is_opaque(const EVP_PKEY *pkey); 99 100 /* EVP_PKEY_supports_digest returns one if |pkey| supports digests of 101 * type |md|. This is intended for use with EVP_PKEYs backing custom 102 * implementations which can't sign all digests. */ 103 OPENSSL_EXPORT int EVP_PKEY_supports_digest(const EVP_PKEY *pkey, 104 const EVP_MD *md); 105 106 /* EVP_PKEY_cmp compares |a| and |b| and returns one if they are equal, zero if 107 * not and a negative number on error. 108 * 109 * WARNING: this differs from the traditional return value of a "cmp" 110 * function. */ 111 OPENSSL_EXPORT int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b); 112 113 /* EVP_PKEY_copy_parameters sets the parameters of |to| to equal the parameters 114 * of |from|. It returns one on success and zero on error. */ 115 OPENSSL_EXPORT int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from); 116 117 /* EVP_PKEY_missing_parameters returns one if |pkey| is missing needed 118 * parameters or zero if not, or if the algorithm doesn't take parameters. */ 119 OPENSSL_EXPORT int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey); 120 121 /* EVP_PKEY_size returns the maximum size, in bytes, of a signature signed by 122 * |pkey|. For an RSA key, this returns the number of bytes needed to represent 123 * the modulus. For an EC key, this returns the maximum size of a DER-encoded 124 * ECDSA signature. */ 125 OPENSSL_EXPORT int EVP_PKEY_size(const EVP_PKEY *pkey); 126 127 /* EVP_PKEY_bits returns the "size", in bits, of |pkey|. For an RSA key, this 128 * returns the bit length of the modulus. For an EC key, this returns the bit 129 * length of the group order. */ 130 OPENSSL_EXPORT int EVP_PKEY_bits(EVP_PKEY *pkey); 131 132 /* EVP_PKEY_id returns the type of |pkey|, which is one of the |EVP_PKEY_*| 133 * values. */ 134 OPENSSL_EXPORT int EVP_PKEY_id(const EVP_PKEY *pkey); 135 136 /* EVP_PKEY_type returns a canonicalised form of |NID|. For example, 137 * |EVP_PKEY_RSA2| will be turned into |EVP_PKEY_RSA|. */ 138 OPENSSL_EXPORT int EVP_PKEY_type(int nid); 139 140 141 /* Getting and setting concrete public key types. 142 * 143 * The following functions get and set the underlying public key in an 144 * |EVP_PKEY| object. The |set1| functions take an additional reference to the 145 * underlying key and return one on success or zero on error. The |assign| 146 * functions adopt the caller's reference. The |get1| functions return a fresh 147 * reference to the underlying object or NULL if |pkey| is not of the correct 148 * type. The |get0| functions behave the same but return a non-owning 149 * pointer. */ 150 151 OPENSSL_EXPORT int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key); 152 OPENSSL_EXPORT int EVP_PKEY_assign_RSA(EVP_PKEY *pkey, RSA *key); 153 OPENSSL_EXPORT RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey); 154 OPENSSL_EXPORT RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey); 155 156 OPENSSL_EXPORT int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key); 157 OPENSSL_EXPORT int EVP_PKEY_assign_DSA(EVP_PKEY *pkey, DSA *key); 158 OPENSSL_EXPORT DSA *EVP_PKEY_get0_DSA(EVP_PKEY *pkey); 159 OPENSSL_EXPORT DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey); 160 161 OPENSSL_EXPORT int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key); 162 OPENSSL_EXPORT int EVP_PKEY_assign_EC_KEY(EVP_PKEY *pkey, EC_KEY *key); 163 OPENSSL_EXPORT EC_KEY *EVP_PKEY_get0_EC_KEY(EVP_PKEY *pkey); 164 OPENSSL_EXPORT EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey); 165 166 #define EVP_PKEY_NONE NID_undef 167 #define EVP_PKEY_RSA NID_rsaEncryption 168 #define EVP_PKEY_RSA2 NID_rsa 169 #define EVP_PKEY_DSA NID_dsa 170 #define EVP_PKEY_EC NID_X9_62_id_ecPublicKey 171 172 /* EVP_PKEY_assign sets the underlying key of |pkey| to |key|, which must be of 173 * the given type. The |type| argument should be one of the |EVP_PKEY_*| 174 * values. */ 175 OPENSSL_EXPORT int EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key); 176 177 /* EVP_PKEY_set_type sets the type of |pkey| to |type|, which should be one of 178 * the |EVP_PKEY_*| values. It returns one if sucessful or zero otherwise. If 179 * |pkey| is NULL, it simply reports whether the type is known. */ 180 OPENSSL_EXPORT int EVP_PKEY_set_type(EVP_PKEY *pkey, int type); 181 182 /* EVP_PKEY_cmp_parameters compares the parameters of |a| and |b|. It returns 183 * one if they match, zero if not, or a negative number of on error. 184 * 185 * WARNING: the return value differs from the usual return value convention. */ 186 OPENSSL_EXPORT int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, 187 const EVP_PKEY *b); 188 189 190 /* ASN.1 functions */ 191 192 /* d2i_PrivateKey parses an ASN.1, DER-encoded, private key from |len| bytes at 193 * |*inp|. If |out| is not NULL then, on exit, a pointer to the result is in 194 * |*out|. If |*out| is already non-NULL on entry then the result is written 195 * directly into |*out|, otherwise a fresh |EVP_PKEY| is allocated. On 196 * successful exit, |*inp| is advanced past the DER structure. It returns the 197 * result or NULL on error. */ 198 OPENSSL_EXPORT EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **out, 199 const uint8_t **inp, long len); 200 201 /* d2i_AutoPrivateKey acts the same as |d2i_PrivateKey|, but detects the type 202 * of the private key. */ 203 OPENSSL_EXPORT EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **out, const uint8_t **inp, 204 long len); 205 206 /* i2d_PrivateKey marshals a private key from |key| to an ASN.1, DER 207 * structure. If |outp| is not NULL then the result is written to |*outp| and 208 * |*outp| is advanced just past the output. It returns the number of bytes in 209 * the result, whether written or not, or a negative value on error. */ 210 OPENSSL_EXPORT int i2d_PrivateKey(const EVP_PKEY *key, uint8_t **outp); 211 212 /* i2d_PublicKey marshals a public key from |key| to a type-specific format. 213 * If |outp| is not NULL then the result is written to |*outp| and 214 * |*outp| is advanced just past the output. It returns the number of bytes in 215 * the result, whether written or not, or a negative value on error. 216 * 217 * RSA keys are serialized as a DER-encoded RSAPublicKey (RFC 3447) structure. 218 * EC keys are serialized as an EC point per SEC 1. */ 219 OPENSSL_EXPORT int i2d_PublicKey(EVP_PKEY *key, uint8_t **outp); 220 221 222 /* Signing */ 223 224 /* EVP_DigestSignInit sets up |ctx| for a signing operation with |type| and 225 * |pkey|. The |ctx| argument must have been initialised with 226 * |EVP_MD_CTX_init|. If |pctx| is not NULL, the |EVP_PKEY_CTX| of the signing 227 * operation will be written to |*pctx|; this can be used to set alternative 228 * signing options. 229 * 230 * It returns one on success, or zero on error. */ 231 OPENSSL_EXPORT int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 232 const EVP_MD *type, ENGINE *e, 233 EVP_PKEY *pkey); 234 235 /* EVP_DigestSignUpdate appends |len| bytes from |data| to the data which will 236 * be signed in |EVP_DigestSignFinal|. It returns one. */ 237 OPENSSL_EXPORT int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, 238 size_t len); 239 240 /* EVP_DigestSignFinal signs the data that has been included by one or more 241 * calls to |EVP_DigestSignUpdate|. If |out_sig| is NULL then |*out_sig_len| is 242 * set to the maximum number of output bytes. Otherwise, on entry, 243 * |*out_sig_len| must contain the length of the |out_sig| buffer. If the call 244 * is successful, the signature is written to |out_sig| and |*out_sig_len| is 245 * set to its length. 246 * 247 * It returns one on success, or zero on error. */ 248 OPENSSL_EXPORT int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig, 249 size_t *out_sig_len); 250 251 /* EVP_DigestSignAlgorithm encodes the signing parameters of |ctx| as an 252 * AlgorithmIdentifer and saves the result in |algor|. 253 * 254 * It returns one on success, or zero on error. 255 * 256 * TODO(davidben): This API should eventually lose the dependency on 257 * crypto/asn1/. */ 258 OPENSSL_EXPORT int EVP_DigestSignAlgorithm(EVP_MD_CTX *ctx, X509_ALGOR *algor); 259 260 261 /* Verifying */ 262 263 /* EVP_DigestVerifyInit sets up |ctx| for a signature verification operation 264 * with |type| and |pkey|. The |ctx| argument must have been initialised with 265 * |EVP_MD_CTX_init|. If |pctx| is not NULL, the |EVP_PKEY_CTX| of the signing 266 * operation will be written to |*pctx|; this can be used to set alternative 267 * signing options. 268 * 269 * It returns one on success, or zero on error. */ 270 OPENSSL_EXPORT int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 271 const EVP_MD *type, ENGINE *e, 272 EVP_PKEY *pkey); 273 274 /* EVP_DigestVerifyInitFromAlgorithm sets up |ctx| for a signature verification 275 * operation with public key |pkey| and parameters from |algor|. The |ctx| 276 * argument must have been initialised with |EVP_MD_CTX_init|. 277 * 278 * It returns one on success, or zero on error. 279 * 280 * TODO(davidben): This API should eventually lose the dependency on 281 * crypto/asn1/. */ 282 OPENSSL_EXPORT int EVP_DigestVerifyInitFromAlgorithm(EVP_MD_CTX *ctx, 283 X509_ALGOR *algor, 284 EVP_PKEY *pkey); 285 286 /* EVP_DigestVerifyUpdate appends |len| bytes from |data| to the data which 287 * will be verified by |EVP_DigestVerifyFinal|. It returns one. */ 288 OPENSSL_EXPORT int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, 289 size_t len); 290 291 /* EVP_DigestVerifyFinal verifies that |sig_len| bytes of |sig| are a valid 292 * signature for the data that has been included by one or more calls to 293 * |EVP_DigestVerifyUpdate|. It returns one on success and zero otherwise. */ 294 OPENSSL_EXPORT int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig, 295 size_t sig_len); 296 297 298 /* Signing (old functions) */ 299 300 /* EVP_SignInit_ex configures |ctx|, which must already have been initialised, 301 * for a fresh signing operation using the hash function |type|. It returns one 302 * on success and zero otherwise. 303 * 304 * (In order to initialise |ctx|, either obtain it initialised with 305 * |EVP_MD_CTX_create|, or use |EVP_MD_CTX_init|.) */ 306 OPENSSL_EXPORT int EVP_SignInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, 307 ENGINE *impl); 308 309 /* EVP_SignInit is a deprecated version of |EVP_SignInit_ex|. 310 * 311 * TODO(fork): remove. */ 312 OPENSSL_EXPORT int EVP_SignInit(EVP_MD_CTX *ctx, const EVP_MD *type); 313 314 /* EVP_SignUpdate appends |len| bytes from |data| to the data which will be 315 * signed in |EVP_SignFinal|. */ 316 OPENSSL_EXPORT int EVP_SignUpdate(EVP_MD_CTX *ctx, const void *data, 317 size_t len); 318 319 /* EVP_SignFinal signs the data that has been included by one or more calls to 320 * |EVP_SignUpdate|, using the key |pkey|, and writes it to |sig|. On entry, 321 * |sig| must point to at least |EVP_PKEY_size(pkey)| bytes of space. The 322 * actual size of the signature is written to |*out_sig_len|. 323 * 324 * It returns one on success and zero otherwise. 325 * 326 * It does not modify |ctx|, thus it's possible to continue to use |ctx| in 327 * order to sign a longer message. */ 328 OPENSSL_EXPORT int EVP_SignFinal(const EVP_MD_CTX *ctx, uint8_t *sig, 329 unsigned int *out_sig_len, EVP_PKEY *pkey); 330 331 332 /* Verifying (old functions) */ 333 334 /* EVP_VerifyInit_ex configures |ctx|, which must already have been 335 * initialised, for a fresh signature verification operation using the hash 336 * function |type|. It returns one on success and zero otherwise. 337 * 338 * (In order to initialise |ctx|, either obtain it initialised with 339 * |EVP_MD_CTX_create|, or use |EVP_MD_CTX_init|.) */ 340 OPENSSL_EXPORT int EVP_VerifyInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, 341 ENGINE *impl); 342 343 /* EVP_VerifyInit is a deprecated version of |EVP_VerifyInit_ex|. 344 * 345 * TODO(fork): remove. */ 346 OPENSSL_EXPORT int EVP_VerifyInit(EVP_MD_CTX *ctx, const EVP_MD *type); 347 348 /* EVP_VerifyUpdate appends |len| bytes from |data| to the data which will be 349 * signed in |EVP_VerifyFinal|. */ 350 OPENSSL_EXPORT int EVP_VerifyUpdate(EVP_MD_CTX *ctx, const void *data, 351 size_t len); 352 353 /* EVP_VerifyFinal verifies that |sig_len| bytes of |sig| are a valid 354 * signature, by |pkey|, for the data that has been included by one or more 355 * calls to |EVP_VerifyUpdate|. 356 * 357 * It returns one on success and zero otherwise. 358 * 359 * It does not modify |ctx|, thus it's possible to continue to use |ctx| in 360 * order to sign a longer message. */ 361 OPENSSL_EXPORT int EVP_VerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig, 362 size_t sig_len, EVP_PKEY *pkey); 363 364 365 /* Printing */ 366 367 /* EVP_PKEY_print_public prints a textual representation of the public key in 368 * |pkey| to |out|. Returns one on success or zero otherwise. */ 369 OPENSSL_EXPORT int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey, 370 int indent, ASN1_PCTX *pctx); 371 372 /* EVP_PKEY_print_private prints a textual representation of the private key in 373 * |pkey| to |out|. Returns one on success or zero otherwise. */ 374 OPENSSL_EXPORT int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey, 375 int indent, ASN1_PCTX *pctx); 376 377 /* EVP_PKEY_print_params prints a textual representation of the parameters in 378 * |pkey| to |out|. Returns one on success or zero otherwise. */ 379 OPENSSL_EXPORT int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey, 380 int indent, ASN1_PCTX *pctx); 381 382 383 /* Password stretching. 384 * 385 * Password stretching functions take a low-entropy password and apply a slow 386 * function that results in a key suitable for use in symmetric 387 * cryptography. */ 388 389 /* PKCS5_PBKDF2_HMAC computes |iterations| iterations of PBKDF2 of |password| 390 * and |salt|, using |digest|, and outputs |key_len| bytes to |out_key|. It 391 * returns one on success and zero on error. */ 392 OPENSSL_EXPORT int PKCS5_PBKDF2_HMAC(const char *password, size_t password_len, 393 const uint8_t *salt, size_t salt_len, 394 unsigned iterations, const EVP_MD *digest, 395 size_t key_len, uint8_t *out_key); 396 397 /* PKCS5_PBKDF2_HMAC_SHA1 is the same as PKCS5_PBKDF2_HMAC, but with |digest| 398 * fixed to |EVP_sha1|. */ 399 OPENSSL_EXPORT int PKCS5_PBKDF2_HMAC_SHA1(const char *password, 400 size_t password_len, const uint8_t *salt, 401 size_t salt_len, unsigned iterations, 402 size_t key_len, uint8_t *out_key); 403 404 405 /* Public key contexts. 406 * 407 * |EVP_PKEY_CTX| objects hold the context of an operation (e.g. signing or 408 * encrypting) that uses a public key. */ 409 410 /* EVP_PKEY_CTX_new allocates a fresh |EVP_PKEY_CTX| for use with |pkey|. It 411 * returns the context or NULL on error. */ 412 OPENSSL_EXPORT EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e); 413 414 /* EVP_PKEY_CTX_new_id allocates a fresh |EVP_PKEY_CTX| for a key of type |id| 415 * (e.g. |EVP_PKEY_HMAC|). This can be used for key generation where 416 * |EVP_PKEY_CTX_new| can't be used because there isn't an |EVP_PKEY| to pass 417 * it. It returns the context or NULL on error. */ 418 OPENSSL_EXPORT EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e); 419 420 /* EVP_PKEY_CTX_free frees |ctx| and the data it owns. */ 421 OPENSSL_EXPORT void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx); 422 423 /* EVP_PKEY_CTX_dup allocates a fresh |EVP_PKEY_CTX| and sets it equal to the 424 * state of |ctx|. It returns the fresh |EVP_PKEY_CTX| or NULL on error. */ 425 OPENSSL_EXPORT EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *ctx); 426 427 /* EVP_PKEY_CTX_get0_pkey returns the |EVP_PKEY| associated with |ctx|. */ 428 OPENSSL_EXPORT EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx); 429 430 /* EVP_PKEY_CTX_set_app_data sets an opaque pointer on |ctx|. */ 431 OPENSSL_EXPORT void EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data); 432 433 /* EVP_PKEY_CTX_get_app_data returns the opaque pointer from |ctx| that was 434 * previously set with |EVP_PKEY_CTX_set_app_data|, or NULL if none has been 435 * set. */ 436 OPENSSL_EXPORT void *EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx); 437 438 /* EVP_PKEY_sign_init initialises an |EVP_PKEY_CTX| for a signing operation. It 439 * should be called before |EVP_PKEY_sign|. 440 * 441 * It returns one on success or zero on error. */ 442 OPENSSL_EXPORT int EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx); 443 444 /* EVP_PKEY_sign signs |data_len| bytes from |data| using |ctx|. If |sig| is 445 * NULL, the maximum size of the signature is written to 446 * |out_sig_len|. Otherwise, |*sig_len| must contain the number of bytes of 447 * space available at |sig|. If sufficient, the signature will be written to 448 * |sig| and |*sig_len| updated with the true length. 449 * 450 * WARNING: Setting |sig| to NULL only gives the maximum size of the 451 * signature. The actual signature may be smaller. 452 * 453 * It returns one on success or zero on error. (Note: this differs from 454 * OpenSSL, which can also return negative values to indicate an error. ) */ 455 OPENSSL_EXPORT int EVP_PKEY_sign(EVP_PKEY_CTX *ctx, uint8_t *sig, 456 size_t *sig_len, const uint8_t *data, 457 size_t data_len); 458 459 /* EVP_PKEY_verify_init initialises an |EVP_PKEY_CTX| for a signature 460 * verification operation. It should be called before |EVP_PKEY_verify|. 461 * 462 * It returns one on success or zero on error. */ 463 OPENSSL_EXPORT int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx); 464 465 /* EVP_PKEY_verify verifies that |sig_len| bytes from |sig| are a valid signature 466 * for |data|. 467 * 468 * It returns one on success or zero on error. */ 469 OPENSSL_EXPORT int EVP_PKEY_verify(EVP_PKEY_CTX *ctx, const uint8_t *sig, 470 size_t sig_len, const uint8_t *data, 471 size_t data_len); 472 473 /* EVP_PKEY_encrypt_init initialises an |EVP_PKEY_CTX| for an encryption 474 * operation. It should be called before |EVP_PKEY_encrypt|. 475 * 476 * It returns one on success or zero on error. */ 477 OPENSSL_EXPORT int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx); 478 479 /* EVP_PKEY_encrypt encrypts |in_len| bytes from |in|. If |out| is NULL, the 480 * maximum size of the ciphertext is written to |out_len|. Otherwise, |*out_len| 481 * must contain the number of bytes of space available at |out|. If sufficient, 482 * the ciphertext will be written to |out| and |*out_len| updated with the true 483 * length. 484 * 485 * WARNING: Setting |out| to NULL only gives the maximum size of the 486 * ciphertext. The actual ciphertext may be smaller. 487 * 488 * It returns one on success or zero on error. */ 489 OPENSSL_EXPORT int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx, uint8_t *out, 490 size_t *out_len, const uint8_t *in, 491 size_t in_len); 492 493 /* EVP_PKEY_decrypt_init initialises an |EVP_PKEY_CTX| for a decryption 494 * operation. It should be called before |EVP_PKEY_decrypt|. 495 * 496 * It returns one on success or zero on error. */ 497 OPENSSL_EXPORT int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx); 498 499 /* EVP_PKEY_decrypt decrypts |in_len| bytes from |in|. If |out| is NULL, the 500 * maximum size of the plaintext is written to |out_len|. Otherwise, |*out_len| 501 * must contain the number of bytes of space available at |out|. If sufficient, 502 * the ciphertext will be written to |out| and |*out_len| updated with the true 503 * length. 504 * 505 * WARNING: Setting |out| to NULL only gives the maximum size of the 506 * plaintext. The actual plaintext may be smaller. 507 * 508 * It returns one on success or zero on error. */ 509 OPENSSL_EXPORT int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx, uint8_t *out, 510 size_t *out_len, const uint8_t *in, 511 size_t in_len); 512 513 /* EVP_PKEY_derive_init initialises an |EVP_PKEY_CTX| for a key derivation 514 * operation. It should be called before |EVP_PKEY_derive_set_peer| and 515 * |EVP_PKEY_derive|. 516 * 517 * It returns one on success or zero on error. */ 518 OPENSSL_EXPORT int EVP_PKEY_derive_init(EVP_PKEY_CTX *ctx); 519 520 /* EVP_PKEY_derive_set_peer sets the peer's key to be used for key derivation 521 * by |ctx| to |peer|. It should be called after |EVP_PKEY_derive_init|. (For 522 * example, this is used to set the peer's key in (EC)DH.) It returns one on 523 * success and zero on error. */ 524 OPENSSL_EXPORT int EVP_PKEY_derive_set_peer(EVP_PKEY_CTX *ctx, EVP_PKEY *peer); 525 526 /* EVP_PKEY_derive derives a shared key between the two keys configured in 527 * |ctx|. If |key| is non-NULL then, on entry, |out_key_len| must contain the 528 * amount of space at |key|. If sufficient then the shared key will be written 529 * to |key| and |*out_key_len| will be set to the length. If |key| is NULL then 530 * |out_key_len| will be set to the maximum length. 531 * 532 * WARNING: Setting |out| to NULL only gives the maximum size of the key. The 533 * actual key may be smaller. 534 * 535 * It returns one on success and zero on error. */ 536 OPENSSL_EXPORT int EVP_PKEY_derive(EVP_PKEY_CTX *ctx, uint8_t *key, 537 size_t *out_key_len); 538 539 /* EVP_PKEY_keygen_init initialises an |EVP_PKEY_CTX| for a key generation 540 * operation. It should be called before |EVP_PKEY_keygen|. 541 * 542 * It returns one on success or zero on error. */ 543 OPENSSL_EXPORT int EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx); 544 545 /* EVP_PKEY_keygen performs a key generation operation using the values from 546 * |ctx| and sets |*ppkey| to a fresh |EVP_PKEY| containing the resulting key. 547 * It returns one on success or zero on error. */ 548 OPENSSL_EXPORT int EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey); 549 550 551 /* Generic control functions. */ 552 553 /* EVP_PKEY_CTX_set_signature_md sets |md| as the digest to be used in a 554 * signature operation. It returns one on success or zero on error. */ 555 OPENSSL_EXPORT int EVP_PKEY_CTX_set_signature_md(EVP_PKEY_CTX *ctx, 556 const EVP_MD *md); 557 558 /* EVP_PKEY_CTX_get_signature_md sets |*out_md| to the digest to be used in a 559 * signature operation. It returns one on success or zero on error. */ 560 OPENSSL_EXPORT int EVP_PKEY_CTX_get_signature_md(EVP_PKEY_CTX *ctx, 561 const EVP_MD **out_md); 562 563 564 /* RSA specific control functions. */ 565 566 /* EVP_PKEY_CTX_set_rsa_padding sets the padding type to use. It should be one 567 * of the |RSA_*_PADDING| values. Returns one on success or zero on error. */ 568 OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_padding(EVP_PKEY_CTX *ctx, int padding); 569 570 /* EVP_PKEY_CTX_get_rsa_padding sets |*out_padding| to the current padding 571 * value, which is one of the |RSA_*_PADDING| values. Returns one on success or 572 * zero on error. */ 573 OPENSSL_EXPORT int EVP_PKEY_CTX_get_rsa_padding(EVP_PKEY_CTX *ctx, 574 int *out_padding); 575 576 /* EVP_PKEY_CTX_set_rsa_pss_saltlen sets the length of the salt in a PSS-padded 577 * signature. A value of -1 cause the salt to be the same length as the digest 578 * in the signature. A value of -2 causes the salt to be the maximum length 579 * that will fit. Otherwise the value gives the size of the salt in bytes. 580 * 581 * Returns one on success or zero on error. */ 582 OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_pss_saltlen(EVP_PKEY_CTX *ctx, 583 int salt_len); 584 585 /* EVP_PKEY_CTX_get_rsa_pss_saltlen sets |*out_salt_len| to the salt length of 586 * a PSS-padded signature. See the documentation for 587 * |EVP_PKEY_CTX_set_rsa_pss_saltlen| for details of the special values that it 588 * can take. 589 * 590 * Returns one on success or zero on error. */ 591 OPENSSL_EXPORT int EVP_PKEY_CTX_get_rsa_pss_saltlen(EVP_PKEY_CTX *ctx, 592 int *out_salt_len); 593 594 /* EVP_PKEY_CTX_set_rsa_keygen_bits sets the size of the desired RSA modulus, 595 * in bits, for key generation. Returns one on success or zero on 596 * error. */ 597 OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_keygen_bits(EVP_PKEY_CTX *ctx, 598 int bits); 599 600 /* EVP_PKEY_CTX_set_rsa_keygen_pubexp sets |e| as the public exponent for key 601 * generation. Returns one on success or zero on error. */ 602 OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_keygen_pubexp(EVP_PKEY_CTX *ctx, 603 BIGNUM *e); 604 605 /* EVP_PKEY_CTX_set_rsa_oaep_md sets |md| as the digest used in OAEP padding. 606 * Returns one on success or zero on error. */ 607 OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_oaep_md(EVP_PKEY_CTX *ctx, 608 const EVP_MD *md); 609 610 /* EVP_PKEY_CTX_get_rsa_oaep_md sets |*out_md| to the digest function used in 611 * OAEP padding. Returns one on success or zero on error. */ 612 OPENSSL_EXPORT int EVP_PKEY_CTX_get_rsa_oaep_md(EVP_PKEY_CTX *ctx, 613 const EVP_MD **out_md); 614 615 /* EVP_PKEY_CTX_set_rsa_mgf1_md sets |md| as the digest used in MGF1. Returns 616 * one on success or zero on error. */ 617 OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_mgf1_md(EVP_PKEY_CTX *ctx, 618 const EVP_MD *md); 619 620 /* EVP_PKEY_CTX_get_rsa_mgf1_md sets |*out_md| to the digest function used in 621 * MGF1. Returns one on success or zero on error. */ 622 OPENSSL_EXPORT int EVP_PKEY_CTX_get_rsa_mgf1_md(EVP_PKEY_CTX *ctx, 623 const EVP_MD **out_md); 624 625 /* EVP_PKEY_CTX_set0_rsa_oaep_label sets |label_len| bytes from |label| as the 626 * label used in OAEP. DANGER: On success, this call takes ownership of |label| 627 * and will call |OPENSSL_free| on it when |ctx| is destroyed. 628 * 629 * Returns one on success or zero on error. */ 630 OPENSSL_EXPORT int EVP_PKEY_CTX_set0_rsa_oaep_label(EVP_PKEY_CTX *ctx, 631 const uint8_t *label, 632 size_t label_len); 633 634 /* EVP_PKEY_CTX_get0_rsa_oaep_label sets |*out_label| to point to the internal 635 * buffer containing the OAEP label (which may be NULL) and returns the length 636 * of the label or a negative value on error. 637 * 638 * WARNING: the return value differs from the usual return value convention. */ 639 OPENSSL_EXPORT int EVP_PKEY_CTX_get0_rsa_oaep_label(EVP_PKEY_CTX *ctx, 640 const uint8_t **out_label); 641 642 643 /* Deprecated functions. */ 644 645 /* EVP_PKEY_DH is defined for compatibility, but it is impossible to create an 646 * |EVP_PKEY| of that type. */ 647 #define EVP_PKEY_DH NID_dhKeyAgreement 648 649 /* OpenSSL_add_all_algorithms does nothing. */ 650 OPENSSL_EXPORT void OpenSSL_add_all_algorithms(void); 651 652 /* OpenSSL_add_all_ciphers does nothing. */ 653 OPENSSL_EXPORT void OpenSSL_add_all_ciphers(void); 654 655 /* OpenSSL_add_all_digests does nothing. */ 656 OPENSSL_EXPORT void OpenSSL_add_all_digests(void); 657 658 /* EVP_cleanup does nothing. */ 659 OPENSSL_EXPORT void EVP_cleanup(void); 660 661 662 /* Private functions */ 663 664 /* EVP_PKEY_asn1_find returns the ASN.1 method table for the given |nid|, which 665 * should be one of the |EVP_PKEY_*| values. It returns NULL if |nid| is 666 * unknown. */ 667 OPENSSL_EXPORT const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find(ENGINE **pengine, 668 int nid); 669 670 /* EVP_PKEY_asn1_find_str returns an |EVP_PKEY_ASN1_METHOD| by matching values 671 * of the |len| bytes at |name|. For example, if name equals "EC" then it will 672 * return an ECC method. The |pengine| argument is ignored. 673 * 674 * TODO(fork): move to PEM? */ 675 OPENSSL_EXPORT const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find_str( 676 ENGINE **pengine, const char *name, size_t len); 677 678 struct evp_pkey_st { 679 CRYPTO_refcount_t references; 680 681 /* type contains one of the EVP_PKEY_* values or NID_undef and determines 682 * which element (if any) of the |pkey| union is valid. */ 683 int type; 684 685 union { 686 char *ptr; 687 RSA *rsa; 688 DSA *dsa; 689 DH *dh; 690 EC_KEY *ec; 691 } pkey; 692 693 /* ameth contains a pointer to a method table that contains many ASN.1 694 * methods for the key type. */ 695 const EVP_PKEY_ASN1_METHOD *ameth; 696 } /* EVP_PKEY */; 697 698 699 #if defined(__cplusplus) 700 } /* extern C */ 701 #endif 702 703 #define EVP_R_BUFFER_TOO_SMALL 100 704 #define EVP_R_COMMAND_NOT_SUPPORTED 101 705 #define EVP_R_DIFFERENT_KEY_TYPES 104 706 #define EVP_R_DIFFERENT_PARAMETERS 105 707 #define EVP_R_EXPECTING_AN_EC_KEY_KEY 107 708 #define EVP_R_EXPECTING_A_DH_KEY 109 709 #define EVP_R_EXPECTING_A_DSA_KEY 110 710 #define EVP_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE 111 711 #define EVP_R_INVALID_CURVE 112 712 #define EVP_R_INVALID_DIGEST_LENGTH 113 713 #define EVP_R_INVALID_DIGEST_TYPE 114 714 #define EVP_R_INVALID_KEYBITS 115 715 #define EVP_R_INVALID_MGF1_MD 116 716 #define EVP_R_INVALID_PADDING_MODE 118 717 #define EVP_R_INVALID_PSS_PARAMETERS 119 718 #define EVP_R_INVALID_SALT_LENGTH 121 719 #define EVP_R_INVALID_TRAILER 122 720 #define EVP_R_KEYS_NOT_SET 123 721 #define EVP_R_MISSING_PARAMETERS 124 722 #define EVP_R_NO_DEFAULT_DIGEST 125 723 #define EVP_R_NO_KEY_SET 126 724 #define EVP_R_NO_MDC2_SUPPORT 127 725 #define EVP_R_NO_NID_FOR_CURVE 128 726 #define EVP_R_NO_OPERATION_SET 129 727 #define EVP_R_NO_PARAMETERS_SET 130 728 #define EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE 131 729 #define EVP_R_OPERATON_NOT_INITIALIZED 132 730 #define EVP_R_UNKNOWN_DIGEST 133 731 #define EVP_R_UNKNOWN_MASK_DIGEST 134 732 #define EVP_R_UNSUPPORTED_ALGORITHM 138 733 #define EVP_R_UNSUPPORTED_MASK_ALGORITHM 139 734 #define EVP_R_UNSUPPORTED_MASK_PARAMETER 140 735 #define EVP_R_EXPECTING_AN_RSA_KEY 141 736 #define EVP_R_INVALID_OPERATION 142 737 #define EVP_R_DECODE_ERROR 143 738 #define EVP_R_INVALID_PSS_SALTLEN 144 739 #define EVP_R_UNKNOWN_PUBLIC_KEY_TYPE 145 740 #define EVP_R_CONTEXT_NOT_INITIALISED 146 741 #define EVP_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED 147 742 #define EVP_R_WRONG_PUBLIC_KEY_TYPE 148 743 #define EVP_R_UNKNOWN_SIGNATURE_ALGORITHM 149 744 #define EVP_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM 150 745 #define EVP_R_BN_DECODE_ERROR 151 746 #define EVP_R_PARAMETER_ENCODING_ERROR 152 747 #define EVP_R_UNSUPPORTED_PUBLIC_KEY_TYPE 153 748 #define EVP_R_UNSUPPORTED_SIGNATURE_TYPE 154 749 750 #endif /* OPENSSL_HEADER_EVP_H */ 751
