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379 lines
16 KiB
379 lines
16 KiB
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*
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* The DSS routines are based on patches supplied by
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* Steven Schoch <schoch@sheba.arc.nasa.gov>. */
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#ifndef OPENSSL_HEADER_DSA_H
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#define OPENSSL_HEADER_DSA_H
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#include <openssl/base.h>
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#include <openssl/engine.h>
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#include <openssl/ex_data.h>
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#include <openssl/thread.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* DSA contains functions for signing and verifing with the Digital Signature
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* Algorithm. */
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/* Allocation and destruction. */
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/* DSA_new returns a new, empty DSA object or NULL on error. */
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OPENSSL_EXPORT DSA *DSA_new(void);
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/* DSA_new_method acts the same as |DH_new| but takes an explicit |ENGINE|. */
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OPENSSL_EXPORT DSA *DSA_new_method(const ENGINE *engine);
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/* DSA_free decrements the reference count of |dsa| and frees it if the
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* reference count drops to zero. */
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OPENSSL_EXPORT void DSA_free(DSA *dsa);
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/* DSA_up_ref increments the reference count of |dsa|. */
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OPENSSL_EXPORT int DSA_up_ref(DSA *dsa);
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/* Parameter generation. */
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/* DSA_generate_parameters_ex generates a set of DSA parameters by following
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* the procedure given in FIPS 186-4, appendix A.
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* (http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf)
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*
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* The larger prime will have a length of |bits| (e.g. 2048). The |seed| value
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* allows others to generate and verify the same parameters and should be
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* random input which is kept for reference. If |out_counter| or |out_h| are
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* not NULL then the counter and h value used in the generation are written to
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* them.
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*
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* The |cb| argument is passed to |BN_generate_prime_ex| and is thus called
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* during the generation process in order to indicate progress. See the
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* comments for that function for details. In addition to the calls made by
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* |BN_generate_prime_ex|, |DSA_generate_parameters_ex| will call it with
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* |event| equal to 2 and 3 at different stages of the process.
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*
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* It returns one on success and zero otherwise. */
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OPENSSL_EXPORT int DSA_generate_parameters_ex(DSA *dsa, unsigned bits,
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const uint8_t *seed,
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size_t seed_len, int *out_counter,
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unsigned long *out_h,
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BN_GENCB *cb);
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/* DSAparams_dup returns a freshly allocated |DSA| that contains a copy of the
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* parameters from |dsa|. It returns NULL on error. */
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OPENSSL_EXPORT DSA *DSAparams_dup(const DSA *dsa);
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/* Key generation. */
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/* DSA_generate_key generates a public/private key pair in |dsa|, which must
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* already have parameters setup. It returns one on success and zero on
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* error. */
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OPENSSL_EXPORT int DSA_generate_key(DSA *dsa);
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/* Signatures. */
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/* DSA_SIG contains a DSA signature as a pair of integers. */
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typedef struct DSA_SIG_st {
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BIGNUM *r, *s;
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} DSA_SIG;
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/* DSA_SIG_new returns a freshly allocated, DIG_SIG structure or NULL on error.
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* Both |r| and |s| in the signature will be NULL. */
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OPENSSL_EXPORT DSA_SIG *DSA_SIG_new(void);
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/* DSA_SIG_free frees the contents of |sig| and then frees |sig| itself. */
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OPENSSL_EXPORT void DSA_SIG_free(DSA_SIG *sig);
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/* DSA_do_sign returns a signature of the hash in |digest| by the key in |dsa|
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* and returns an allocated, DSA_SIG structure, or NULL on error. */
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OPENSSL_EXPORT DSA_SIG *DSA_do_sign(const uint8_t *digest, size_t digest_len,
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DSA *dsa);
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/* DSA_do_verify verifies that |sig| is a valid signature, by the public key in
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* |dsa|, of the hash in |digest|. It returns one if so, zero if invalid and -1
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* on error.
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*
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* WARNING: do not use. This function returns -1 for error, 0 for invalid and 1
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* for valid. However, this is dangerously different to the usual OpenSSL
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* convention and could be a disaster if a user did |if (DSA_do_verify(...))|.
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* Because of this, |DSA_check_signature| is a safer version of this.
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*
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* TODO(fork): deprecate. */
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OPENSSL_EXPORT int DSA_do_verify(const uint8_t *digest, size_t digest_len,
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DSA_SIG *sig, const DSA *dsa);
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/* DSA_do_check_signature sets |*out_valid| to zero. Then it verifies that |sig|
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* is a valid signature, by the public key in |dsa| of the hash in |digest|
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* and, if so, it sets |*out_valid| to one.
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*
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* It returns one if it was able to verify the signature as valid or invalid,
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* and zero on error. */
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OPENSSL_EXPORT int DSA_do_check_signature(int *out_valid, const uint8_t *digest,
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size_t digest_len, DSA_SIG *sig,
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const DSA *dsa);
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/* ASN.1 signatures.
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*
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* These functions also perform DSA signature operations, but deal with ASN.1
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* encoded signatures as opposed to raw |BIGNUM|s. If you don't know what
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* encoding a DSA signature is in, it's probably ASN.1. */
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/* DSA_sign signs |digest| with the key in |dsa| and writes the resulting
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* signature, in ASN.1 form, to |out_sig| and the length of the signature to
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* |*out_siglen|. There must be, at least, |DSA_size(dsa)| bytes of space in
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* |out_sig|. It returns one on success and zero otherwise.
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*
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* (The |type| argument is ignored.) */
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OPENSSL_EXPORT int DSA_sign(int type, const uint8_t *digest, size_t digest_len,
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uint8_t *out_sig, unsigned int *out_siglen,
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DSA *dsa);
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/* DSA_verify verifies that |sig| is a valid, ASN.1 signature, by the public
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* key in |dsa|, of the hash in |digest|. It returns one if so, zero if invalid
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* and -1 on error.
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*
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* (The |type| argument is ignored.)
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*
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* WARNING: do not use. This function returns -1 for error, 0 for invalid and 1
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* for valid. However, this is dangerously different to the usual OpenSSL
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* convention and could be a disaster if a user did |if (DSA_do_verify(...))|.
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* Because of this, |DSA_check_signature| is a safer version of this.
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*
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* TODO(fork): deprecate. */
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OPENSSL_EXPORT int DSA_verify(int type, const uint8_t *digest,
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size_t digest_len, const uint8_t *sig,
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size_t sig_len, const DSA *dsa);
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/* DSA_check_signature sets |*out_valid| to zero. Then it verifies that |sig|
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* is a valid, ASN.1 signature, by the public key in |dsa|, of the hash in
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* |digest|. If so, it sets |*out_valid| to one.
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*
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* It returns one if it was able to verify the signature as valid or invalid,
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* and zero on error. */
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OPENSSL_EXPORT int DSA_check_signature(int *out_valid, const uint8_t *digest,
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size_t digest_len, const uint8_t *sig,
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size_t sig_len, const DSA *dsa);
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/* DSA_size returns the size, in bytes, of an ASN.1 encoded, DSA signature
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* generated by |dsa|. Parameters must already have been setup in |dsa|. */
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OPENSSL_EXPORT int DSA_size(const DSA *dsa);
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/* ASN.1 encoding. */
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/* d2i_DSA_SIG parses an ASN.1, DER-encoded, DSA signature from |len| bytes at
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* |*inp|. If |out_sig| is not NULL then, on exit, a pointer to the result is
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* in |*out_sig|. If |*out_sig| is already non-NULL on entry then the result is
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* written directly into |*out_sig|, otherwise a fresh |DSA_SIG| is allocated.
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* On successful exit, |*inp| is advanced past the DER structure. It returns
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* the result or NULL on error. */
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OPENSSL_EXPORT DSA_SIG *d2i_DSA_SIG(DSA_SIG **out_sig, const uint8_t **inp,
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long len);
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/* i2d_DSA_SIG marshals |in| to an ASN.1, DER structure. If |outp| is not NULL
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* then the result is written to |*outp| and |*outp| is advanced just past the
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* output. It returns the number of bytes in the result, whether written or not,
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* or a negative value on error. */
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OPENSSL_EXPORT int i2d_DSA_SIG(const DSA_SIG *in, uint8_t **outp);
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/* d2i_DSAPublicKey parses an ASN.1, DER-encoded, DSA public key from |len|
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* bytes at |*inp|. If |out| is not NULL then, on exit, a pointer to the result
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* is in |*out|. If |*out| is already non-NULL on entry then the result is
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* written directly into |*out|, otherwise a fresh |DSA| is allocated. On
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* successful exit, |*inp| is advanced past the DER structure. It returns the
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* result or NULL on error. */
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OPENSSL_EXPORT DSA *d2i_DSAPublicKey(DSA **out, const uint8_t **inp, long len);
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/* i2d_DSAPublicKey marshals a public key from |in| to an ASN.1, DER structure.
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* If |outp| is not NULL then the result is written to |*outp| and |*outp| is
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* advanced just past the output. It returns the number of bytes in the result,
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* whether written or not, or a negative value on error. */
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OPENSSL_EXPORT int i2d_DSAPublicKey(const DSA *in, unsigned char **outp);
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/* d2i_DSAPrivateKey parses an ASN.1, DER-encoded, DSA private key from |len|
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* bytes at |*inp|. If |out| is not NULL then, on exit, a pointer to the result
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* is in |*out|. If |*out| is already non-NULL on entry then the result is
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* written directly into |*out|, otherwise a fresh |DSA| is allocated. On
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* successful exit, |*inp| is advanced past the DER structure. It returns the
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* result or NULL on error. */
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OPENSSL_EXPORT DSA *d2i_DSAPrivateKey(DSA **out, const uint8_t **inp, long len);
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/* i2d_DSAPrivateKey marshals a private key from |in| to an ASN.1, DER structure.
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* If |outp| is not NULL then the result is written to |*outp| and |*outp| is
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* advanced just past the output. It returns the number of bytes in the result,
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* whether written or not, or a negative value on error. */
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OPENSSL_EXPORT int i2d_DSAPrivateKey(const DSA *in, unsigned char **outp);
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/* d2i_DSAparams parses ASN.1, DER-encoded, DSA parameters from |len| bytes at
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* |*inp|. If |out| is not NULL then, on exit, a pointer to the result is in
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* |*out|. If |*out| is already non-NULL on entry then the result is written
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* directly into |*out|, otherwise a fresh |DSA| is allocated. On successful
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* exit, |*inp| is advanced past the DER structure. It returns the result or
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* NULL on error. */
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OPENSSL_EXPORT DSA *d2i_DSAparams(DSA **out, const uint8_t **inp, long len);
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/* i2d_DSAparams marshals DSA parameters from |in| to an ASN.1, DER structure.
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* If |outp| is not NULL then the result is written to |*outp| and |*outp| is
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* advanced just past the output. It returns the number of bytes in the result,
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* whether written or not, or a negative value on error. */
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OPENSSL_EXPORT int i2d_DSAparams(const DSA *in, unsigned char **outp);
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/* Precomputation. */
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/* DSA_sign_setup precomputes the message independent part of the DSA signature
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* and writes them to |*out_kinv| and |*out_r|. Returns one on success, zero on
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* error.
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*
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* TODO(fork): decide what to do with this. Since making DSA* opaque there's no
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* way for the user to install them. Also, it forces the DSA* not to be const
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* when passing to the signing function. */
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OPENSSL_EXPORT int DSA_sign_setup(const DSA *dsa, BN_CTX *ctx,
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BIGNUM **out_kinv, BIGNUM **out_r);
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/* Conversion. */
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/* DSA_dup_DH returns a |DH| constructed from the parameters of |dsa|. This is
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* sometimes needed when Diffie-Hellman parameters are stored in the form of
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* DSA parameters. It returns an allocated |DH| on success or NULL on error. */
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OPENSSL_EXPORT DH *DSA_dup_DH(const DSA *dsa);
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/* ex_data functions.
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*
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* See |ex_data.h| for details. */
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OPENSSL_EXPORT int DSA_get_ex_new_index(long argl, void *argp,
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CRYPTO_EX_new *new_func,
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CRYPTO_EX_dup *dup_func,
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CRYPTO_EX_free *free_func);
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OPENSSL_EXPORT int DSA_set_ex_data(DSA *d, int idx, void *arg);
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OPENSSL_EXPORT void *DSA_get_ex_data(const DSA *d, int idx);
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struct dsa_method {
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struct openssl_method_common_st common;
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void *app_data;
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int (*init)(DSA *dsa);
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int (*finish)(DSA *dsa);
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DSA_SIG *(*sign)(const uint8_t *digest, size_t digest_len, DSA *dsa);
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int (*sign_setup)(const DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp,
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const uint8_t *digest, size_t digest_len);
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int (*verify)(int *out_valid, const uint8_t *digest, size_t digest_len,
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DSA_SIG *sig, const DSA *dsa);
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/* generate_parameters, if non-NULL, is used to generate DSA parameters. */
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int (*generate_parameters)(DSA *dsa, unsigned bits, const uint8_t *seed,
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size_t seed_len, int *counter_ret,
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unsigned long *h_ret, BN_GENCB *cb);
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/* keygen, if non-NULL, is used to generate DSA keys. */
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int (*keygen)(DSA *dsa);
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};
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struct dsa_st {
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long version;
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int write_params;
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BIGNUM *p;
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BIGNUM *q; /* == 20 */
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BIGNUM *g;
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BIGNUM *pub_key; /* y public key */
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BIGNUM *priv_key; /* x private key */
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BIGNUM *kinv; /* Signing pre-calc */
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BIGNUM *r; /* Signing pre-calc */
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int flags;
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/* Normally used to cache montgomery values */
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CRYPTO_MUTEX method_mont_p_lock;
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BN_MONT_CTX *method_mont_p;
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CRYPTO_refcount_t references;
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CRYPTO_EX_DATA ex_data;
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DSA_METHOD *meth;
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/* functional reference if 'meth' is ENGINE-provided */
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ENGINE *engine;
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};
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#if defined(__cplusplus)
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} /* extern C */
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#endif
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#define DSA_F_DSA_new_method 100
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#define DSA_F_dsa_sig_cb 101
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#define DSA_F_sign 102
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#define DSA_F_sign_setup 103
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#define DSA_F_verify 104
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#define DSA_R_BAD_Q_VALUE 100
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#define DSA_R_MISSING_PARAMETERS 101
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#define DSA_R_MODULUS_TOO_LARGE 102
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#define DSA_R_NEED_NEW_SETUP_VALUES 103
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#endif /* OPENSSL_HEADER_DSA_H */
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