1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay@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@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@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@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 * The DSS routines are based on patches supplied by 58 * Steven Schoch <schoch@sheba.arc.nasa.gov>. */ 59 60 #ifndef OPENSSL_HEADER_DSA_H 61 #define OPENSSL_HEADER_DSA_H 62 63 #include <openssl/base.h> 64 65 #include <openssl/engine.h> 66 #include <openssl/ex_data.h> 67 #include <openssl/thread.h> 68 69 #if defined(__cplusplus) 70 extern "C" { 71 #endif 72 73 74 // DSA contains functions for signing and verifying with the Digital Signature 75 // Algorithm. 76 // 77 // This module is deprecated and retained for legacy reasons only. It is not 78 // considered a priority for performance or hardening work. Do not use it in 79 // new code. Use Ed25519, ECDSA with P-256, or RSA instead. 80 81 82 // Allocation and destruction. 83 84 // DSA_new returns a new, empty DSA object or NULL on error. 85 OPENSSL_EXPORT DSA *DSA_new(void); 86 87 // DSA_free decrements the reference count of |dsa| and frees it if the 88 // reference count drops to zero. 89 OPENSSL_EXPORT void DSA_free(DSA *dsa); 90 91 // DSA_up_ref increments the reference count of |dsa| and returns one. 92 OPENSSL_EXPORT int DSA_up_ref(DSA *dsa); 93 94 95 // Properties. 96 97 // DSA_get0_key sets |*out_pub_key| and |*out_priv_key|, if non-NULL, to |dsa|'s 98 // public and private key, respectively. If |dsa| is a public key, the private 99 // key will be set to NULL. 100 OPENSSL_EXPORT void DSA_get0_key(const DSA *dsa, const BIGNUM **out_pub_key, 101 const BIGNUM **out_priv_key); 102 103 // DSA_get0_pqg sets |*out_p|, |*out_q|, and |*out_g|, if non-NULL, to |dsa|'s 104 // p, q, and g parameters, respectively. 105 OPENSSL_EXPORT void DSA_get0_pqg(const DSA *dsa, const BIGNUM **out_p, 106 const BIGNUM **out_q, const BIGNUM **out_g); 107 108 // DSA_set0_key sets |dsa|'s public and private key to |pub_key| and |priv_key|, 109 // respectively, if non-NULL. On success, it takes ownership of each argument 110 // and returns one. Otherwise, it returns zero. 111 // 112 // |priv_key| may be NULL, but |pub_key| must either be non-NULL or already 113 // configured on |dsa|. 114 OPENSSL_EXPORT int DSA_set0_key(DSA *dsa, BIGNUM *pub_key, BIGNUM *priv_key); 115 116 // DSA_set0_pqg sets |dsa|'s parameters to |p|, |q|, and |g|, if non-NULL, and 117 // takes ownership of them. On success, it takes ownership of each argument and 118 // returns one. Otherwise, it returns zero. 119 // 120 // Each argument must either be non-NULL or already configured on |dsa|. 121 OPENSSL_EXPORT int DSA_set0_pqg(DSA *dsa, BIGNUM *p, BIGNUM *q, BIGNUM *g); 122 123 124 // Parameter generation. 125 126 // DSA_generate_parameters_ex generates a set of DSA parameters by following 127 // the procedure given in FIPS 186-4, appendix A. 128 // (http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf) 129 // 130 // The larger prime will have a length of |bits| (e.g. 2048). The |seed| value 131 // allows others to generate and verify the same parameters and should be 132 // random input which is kept for reference. If |out_counter| or |out_h| are 133 // not NULL then the counter and h value used in the generation are written to 134 // them. 135 // 136 // The |cb| argument is passed to |BN_generate_prime_ex| and is thus called 137 // during the generation process in order to indicate progress. See the 138 // comments for that function for details. In addition to the calls made by 139 // |BN_generate_prime_ex|, |DSA_generate_parameters_ex| will call it with 140 // |event| equal to 2 and 3 at different stages of the process. 141 // 142 // It returns one on success and zero otherwise. 143 OPENSSL_EXPORT int DSA_generate_parameters_ex(DSA *dsa, unsigned bits, 144 const uint8_t *seed, 145 size_t seed_len, int *out_counter, 146 unsigned long *out_h, 147 BN_GENCB *cb); 148 149 // DSAparams_dup returns a freshly allocated |DSA| that contains a copy of the 150 // parameters from |dsa|. It returns NULL on error. 151 OPENSSL_EXPORT DSA *DSAparams_dup(const DSA *dsa); 152 153 154 // Key generation. 155 156 // DSA_generate_key generates a public/private key pair in |dsa|, which must 157 // already have parameters setup. It returns one on success and zero on 158 // error. 159 OPENSSL_EXPORT int DSA_generate_key(DSA *dsa); 160 161 162 // Signatures. 163 164 // DSA_SIG_st (aka |DSA_SIG|) contains a DSA signature as a pair of integers. 165 struct DSA_SIG_st { 166 BIGNUM *r, *s; 167 }; 168 169 // DSA_SIG_new returns a freshly allocated, DIG_SIG structure or NULL on error. 170 // Both |r| and |s| in the signature will be NULL. 171 OPENSSL_EXPORT DSA_SIG *DSA_SIG_new(void); 172 173 // DSA_SIG_free frees the contents of |sig| and then frees |sig| itself. 174 OPENSSL_EXPORT void DSA_SIG_free(DSA_SIG *sig); 175 176 // DSA_do_sign returns a signature of the hash in |digest| by the key in |dsa| 177 // and returns an allocated, DSA_SIG structure, or NULL on error. 178 OPENSSL_EXPORT DSA_SIG *DSA_do_sign(const uint8_t *digest, size_t digest_len, 179 const DSA *dsa); 180 181 // DSA_do_verify verifies that |sig| is a valid signature, by the public key in 182 // |dsa|, of the hash in |digest|. It returns one if so, zero if invalid and -1 183 // on error. 184 // 185 // WARNING: do not use. This function returns -1 for error, 0 for invalid and 1 186 // for valid. However, this is dangerously different to the usual OpenSSL 187 // convention and could be a disaster if a user did |if (DSA_do_verify(...))|. 188 // Because of this, |DSA_check_signature| is a safer version of this. 189 // 190 // TODO(fork): deprecate. 191 OPENSSL_EXPORT int DSA_do_verify(const uint8_t *digest, size_t digest_len, 192 DSA_SIG *sig, const DSA *dsa); 193 194 // DSA_do_check_signature sets |*out_valid| to zero. Then it verifies that |sig| 195 // is a valid signature, by the public key in |dsa| of the hash in |digest| 196 // and, if so, it sets |*out_valid| to one. 197 // 198 // It returns one if it was able to verify the signature as valid or invalid, 199 // and zero on error. 200 OPENSSL_EXPORT int DSA_do_check_signature(int *out_valid, const uint8_t *digest, 201 size_t digest_len, DSA_SIG *sig, 202 const DSA *dsa); 203 204 205 // ASN.1 signatures. 206 // 207 // These functions also perform DSA signature operations, but deal with ASN.1 208 // encoded signatures as opposed to raw |BIGNUM|s. If you don't know what 209 // encoding a DSA signature is in, it's probably ASN.1. 210 211 // DSA_sign signs |digest| with the key in |dsa| and writes the resulting 212 // signature, in ASN.1 form, to |out_sig| and the length of the signature to 213 // |*out_siglen|. There must be, at least, |DSA_size(dsa)| bytes of space in 214 // |out_sig|. It returns one on success and zero otherwise. 215 // 216 // (The |type| argument is ignored.) 217 OPENSSL_EXPORT int DSA_sign(int type, const uint8_t *digest, size_t digest_len, 218 uint8_t *out_sig, unsigned int *out_siglen, 219 const DSA *dsa); 220 221 // DSA_verify verifies that |sig| is a valid, ASN.1 signature, by the public 222 // key in |dsa|, of the hash in |digest|. It returns one if so, zero if invalid 223 // and -1 on error. 224 // 225 // (The |type| argument is ignored.) 226 // 227 // WARNING: do not use. This function returns -1 for error, 0 for invalid and 1 228 // for valid. However, this is dangerously different to the usual OpenSSL 229 // convention and could be a disaster if a user did |if (DSA_do_verify(...))|. 230 // Because of this, |DSA_check_signature| is a safer version of this. 231 // 232 // TODO(fork): deprecate. 233 OPENSSL_EXPORT int DSA_verify(int type, const uint8_t *digest, 234 size_t digest_len, const uint8_t *sig, 235 size_t sig_len, const DSA *dsa); 236 237 // DSA_check_signature sets |*out_valid| to zero. Then it verifies that |sig| 238 // is a valid, ASN.1 signature, by the public key in |dsa|, of the hash in 239 // |digest|. If so, it sets |*out_valid| to one. 240 // 241 // It returns one if it was able to verify the signature as valid or invalid, 242 // and zero on error. 243 OPENSSL_EXPORT int DSA_check_signature(int *out_valid, const uint8_t *digest, 244 size_t digest_len, const uint8_t *sig, 245 size_t sig_len, const DSA *dsa); 246 247 // DSA_size returns the size, in bytes, of an ASN.1 encoded, DSA signature 248 // generated by |dsa|. Parameters must already have been setup in |dsa|. 249 OPENSSL_EXPORT int DSA_size(const DSA *dsa); 250 251 252 // ASN.1 encoding. 253 254 // DSA_SIG_parse parses a DER-encoded DSA-Sig-Value structure from |cbs| and 255 // advances |cbs|. It returns a newly-allocated |DSA_SIG| or NULL on error. 256 OPENSSL_EXPORT DSA_SIG *DSA_SIG_parse(CBS *cbs); 257 258 // DSA_SIG_marshal marshals |sig| as a DER-encoded DSA-Sig-Value and appends the 259 // result to |cbb|. It returns one on success and zero on error. 260 OPENSSL_EXPORT int DSA_SIG_marshal(CBB *cbb, const DSA_SIG *sig); 261 262 // DSA_parse_public_key parses a DER-encoded DSA public key from |cbs| and 263 // advances |cbs|. It returns a newly-allocated |DSA| or NULL on error. 264 OPENSSL_EXPORT DSA *DSA_parse_public_key(CBS *cbs); 265 266 // DSA_marshal_public_key marshals |dsa| as a DER-encoded DSA public key and 267 // appends the result to |cbb|. It returns one on success and zero on 268 // failure. 269 OPENSSL_EXPORT int DSA_marshal_public_key(CBB *cbb, const DSA *dsa); 270 271 // DSA_parse_private_key parses a DER-encoded DSA private key from |cbs| and 272 // advances |cbs|. It returns a newly-allocated |DSA| or NULL on error. 273 OPENSSL_EXPORT DSA *DSA_parse_private_key(CBS *cbs); 274 275 // DSA_marshal_private_key marshals |dsa| as a DER-encoded DSA private key and 276 // appends the result to |cbb|. It returns one on success and zero on 277 // failure. 278 OPENSSL_EXPORT int DSA_marshal_private_key(CBB *cbb, const DSA *dsa); 279 280 // DSA_parse_parameters parses a DER-encoded Dss-Parms structure (RFC 3279) 281 // from |cbs| and advances |cbs|. It returns a newly-allocated |DSA| or NULL on 282 // error. 283 OPENSSL_EXPORT DSA *DSA_parse_parameters(CBS *cbs); 284 285 // DSA_marshal_parameters marshals |dsa| as a DER-encoded Dss-Parms structure 286 // (RFC 3447) and appends the result to |cbb|. It returns one on success and 287 // zero on failure. 288 OPENSSL_EXPORT int DSA_marshal_parameters(CBB *cbb, const DSA *dsa); 289 290 291 // Conversion. 292 293 // DSA_dup_DH returns a |DH| constructed from the parameters of |dsa|. This is 294 // sometimes needed when Diffie-Hellman parameters are stored in the form of 295 // DSA parameters. It returns an allocated |DH| on success or NULL on error. 296 OPENSSL_EXPORT DH *DSA_dup_DH(const DSA *dsa); 297 298 299 // ex_data functions. 300 // 301 // See |ex_data.h| for details. 302 303 OPENSSL_EXPORT int DSA_get_ex_new_index(long argl, void *argp, 304 CRYPTO_EX_unused *unused, 305 CRYPTO_EX_dup *dup_unused, 306 CRYPTO_EX_free *free_func); 307 OPENSSL_EXPORT int DSA_set_ex_data(DSA *dsa, int idx, void *arg); 308 OPENSSL_EXPORT void *DSA_get_ex_data(const DSA *dsa, int idx); 309 310 311 // Deprecated functions. 312 313 // d2i_DSA_SIG parses an ASN.1, DER-encoded, DSA signature from |len| bytes at 314 // |*inp|. If |out_sig| is not NULL then, on exit, a pointer to the result is 315 // in |*out_sig|. Note that, even if |*out_sig| is already non-NULL on entry, it 316 // will not be written to. Rather, a fresh |DSA_SIG| is allocated and the 317 // previous one is freed. On successful exit, |*inp| is advanced past the DER 318 // structure. It returns the result or NULL on error. 319 // 320 // Use |DSA_SIG_parse| instead. 321 OPENSSL_EXPORT DSA_SIG *d2i_DSA_SIG(DSA_SIG **out_sig, const uint8_t **inp, 322 long len); 323 324 // i2d_DSA_SIG marshals |in| to an ASN.1, DER structure. If |outp| is not NULL 325 // then the result is written to |*outp| and |*outp| is advanced just past the 326 // output. It returns the number of bytes in the result, whether written or not, 327 // or a negative value on error. 328 // 329 // Use |DSA_SIG_marshal| instead. 330 OPENSSL_EXPORT int i2d_DSA_SIG(const DSA_SIG *in, uint8_t **outp); 331 332 // d2i_DSAPublicKey parses an ASN.1, DER-encoded, DSA public key from |len| 333 // bytes at |*inp|. If |out| is not NULL then, on exit, a pointer to the result 334 // is in |*out|. Note that, even if |*ou| is already non-NULL on entry, it will 335 // not be written to. Rather, a fresh |DSA| is allocated and the previous one is 336 // freed. On successful exit, |*inp| is advanced past the DER structure. It 337 // returns the result or NULL on error. 338 // 339 // Use |DSA_parse_public_key| instead. 340 OPENSSL_EXPORT DSA *d2i_DSAPublicKey(DSA **out, const uint8_t **inp, long len); 341 342 // i2d_DSAPublicKey marshals a public key from |in| to an ASN.1, DER structure. 343 // If |outp| is not NULL then the result is written to |*outp| and |*outp| is 344 // advanced just past the output. It returns the number of bytes in the result, 345 // whether written or not, or a negative value on error. 346 // 347 // Use |DSA_marshal_public_key| instead. 348 OPENSSL_EXPORT int i2d_DSAPublicKey(const DSA *in, uint8_t **outp); 349 350 // d2i_DSAPrivateKey parses an ASN.1, DER-encoded, DSA private key from |len| 351 // bytes at |*inp|. If |out| is not NULL then, on exit, a pointer to the result 352 // is in |*out|. Note that, even if |*out| is already non-NULL on entry, it will 353 // not be written to. Rather, a fresh |DSA| is allocated and the previous one is 354 // freed. On successful exit, |*inp| is advanced past the DER structure. It 355 // returns the result or NULL on error. 356 // 357 // Use |DSA_parse_private_key| instead. 358 OPENSSL_EXPORT DSA *d2i_DSAPrivateKey(DSA **out, const uint8_t **inp, long len); 359 360 // i2d_DSAPrivateKey marshals a private key from |in| to an ASN.1, DER 361 // structure. If |outp| is not NULL then the result is written to |*outp| and 362 // |*outp| is advanced just past the output. It returns the number of bytes in 363 // the result, whether written or not, or a negative value on error. 364 // 365 // Use |DSA_marshal_private_key| instead. 366 OPENSSL_EXPORT int i2d_DSAPrivateKey(const DSA *in, uint8_t **outp); 367 368 // d2i_DSAparams parses ASN.1, DER-encoded, DSA parameters from |len| bytes at 369 // |*inp|. If |out| is not NULL then, on exit, a pointer to the result is in 370 // |*out|. Note that, even if |*out| is already non-NULL on entry, it will not 371 // be written to. Rather, a fresh |DSA| is allocated and the previous one is 372 // freed. On successful exit, |*inp| is advanced past the DER structure. It 373 // returns the result or NULL on error. 374 // 375 // Use |DSA_parse_parameters| instead. 376 OPENSSL_EXPORT DSA *d2i_DSAparams(DSA **out, const uint8_t **inp, long len); 377 378 // i2d_DSAparams marshals DSA parameters from |in| to an ASN.1, DER structure. 379 // If |outp| is not NULL then the result is written to |*outp| and |*outp| is 380 // advanced just past the output. It returns the number of bytes in the result, 381 // whether written or not, or a negative value on error. 382 // 383 // Use |DSA_marshal_parameters| instead. 384 OPENSSL_EXPORT int i2d_DSAparams(const DSA *in, uint8_t **outp); 385 386 // DSA_generate_parameters is a deprecated version of 387 // |DSA_generate_parameters_ex| that creates and returns a |DSA*|. Don't use 388 // it. 389 OPENSSL_EXPORT DSA *DSA_generate_parameters(int bits, unsigned char *seed, 390 int seed_len, int *counter_ret, 391 unsigned long *h_ret, 392 void (*callback)(int, int, void *), 393 void *cb_arg); 394 395 396 struct dsa_st { 397 long version; 398 BIGNUM *p; 399 BIGNUM *q; // == 20 400 BIGNUM *g; 401 402 BIGNUM *pub_key; // y public key 403 BIGNUM *priv_key; // x private key 404 405 int flags; 406 // Normally used to cache montgomery values 407 CRYPTO_MUTEX method_mont_lock; 408 BN_MONT_CTX *method_mont_p; 409 BN_MONT_CTX *method_mont_q; 410 CRYPTO_refcount_t references; 411 CRYPTO_EX_DATA ex_data; 412 }; 413 414 415 #if defined(__cplusplus) 416 } // extern C 417 418 extern "C++" { 419 420 BSSL_NAMESPACE_BEGIN 421 422 BORINGSSL_MAKE_DELETER(DSA, DSA_free) 423 BORINGSSL_MAKE_UP_REF(DSA, DSA_up_ref) 424 BORINGSSL_MAKE_DELETER(DSA_SIG, DSA_SIG_free) 425 426 BSSL_NAMESPACE_END 427 428 } // extern C++ 429 430 #endif 431 432 #define DSA_R_BAD_Q_VALUE 100 433 #define DSA_R_MISSING_PARAMETERS 101 434 #define DSA_R_MODULUS_TOO_LARGE 102 435 #define DSA_R_NEED_NEW_SETUP_VALUES 103 436 #define DSA_R_BAD_VERSION 104 437 #define DSA_R_DECODE_ERROR 105 438 #define DSA_R_ENCODE_ERROR 106 439 440 #endif // OPENSSL_HEADER_DSA_H 441