--- /dev/null
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to. The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code. The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * "This product includes cryptographic software written by
+ * Eric Young (eay@cryptsoft.com)"
+ * The word 'cryptographic' can be left out if the rouines from the library
+ * being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ * the apps directory (application code) you must include an acknowledgement:
+ * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed. i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ *
+ * The DSS routines are based on patches supplied by
+ * Steven Schoch <schoch@sheba.arc.nasa.gov>. */
+
+#ifndef OPENSSL_HEADER_DSA_H
+#define OPENSSL_HEADER_DSA_H
+
+#include <openssl/base.h>
+
+#include <openssl/engine.h>
+#include <openssl/ex_data.h>
+#include <openssl/thread.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+// DSA contains functions for signing and verifying with the Digital Signature
+// Algorithm.
+
+
+// Allocation and destruction.
+
+// DSA_new returns a new, empty DSA object or NULL on error.
+OPENSSL_EXPORT DSA *DSA_new(void);
+
+// DSA_free decrements the reference count of |dsa| and frees it if the
+// reference count drops to zero.
+OPENSSL_EXPORT void DSA_free(DSA *dsa);
+
+// DSA_up_ref increments the reference count of |dsa| and returns one.
+OPENSSL_EXPORT int DSA_up_ref(DSA *dsa);
+
+
+// Properties.
+
+// DSA_get0_key sets |*out_pub_key| and |*out_priv_key|, if non-NULL, to |dsa|'s
+// public and private key, respectively. If |dsa| is a public key, the private
+// key will be set to NULL.
+OPENSSL_EXPORT void DSA_get0_key(const DSA *dsa, const BIGNUM **out_pub_key,
+ const BIGNUM **out_priv_key);
+
+// DSA_get0_pqg sets |*out_p|, |*out_q|, and |*out_g|, if non-NULL, to |dsa|'s
+// p, q, and g parameters, respectively.
+OPENSSL_EXPORT void DSA_get0_pqg(const DSA *dsa, const BIGNUM **out_p,
+ const BIGNUM **out_q, const BIGNUM **out_g);
+
+// DSA_set0_key sets |dsa|'s public and private key to |pub_key| and |priv_key|,
+// respectively, if non-NULL. On success, it takes ownership of each argument
+// and returns one. Otherwise, it returns zero.
+//
+// |priv_key| may be NULL, but |pub_key| must either be non-NULL or already
+// configured on |dsa|.
+OPENSSL_EXPORT int DSA_set0_key(DSA *dsa, BIGNUM *pub_key, BIGNUM *priv_key);
+
+// DSA_set0_pqg sets |dsa|'s parameters to |p|, |q|, and |g|, if non-NULL, and
+// takes ownership of them. On success, it takes ownership of each argument and
+// returns one. Otherwise, it returns zero.
+//
+// Each argument must either be non-NULL or already configured on |dsa|.
+OPENSSL_EXPORT int DSA_set0_pqg(DSA *dsa, BIGNUM *p, BIGNUM *q, BIGNUM *g);
+
+
+// Parameter generation.
+
+// DSA_generate_parameters_ex generates a set of DSA parameters by following
+// the procedure given in FIPS 186-4, appendix A.
+// (http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf)
+//
+// The larger prime will have a length of |bits| (e.g. 2048). The |seed| value
+// allows others to generate and verify the same parameters and should be
+// random input which is kept for reference. If |out_counter| or |out_h| are
+// not NULL then the counter and h value used in the generation are written to
+// them.
+//
+// The |cb| argument is passed to |BN_generate_prime_ex| and is thus called
+// during the generation process in order to indicate progress. See the
+// comments for that function for details. In addition to the calls made by
+// |BN_generate_prime_ex|, |DSA_generate_parameters_ex| will call it with
+// |event| equal to 2 and 3 at different stages of the process.
+//
+// It returns one on success and zero otherwise.
+OPENSSL_EXPORT int DSA_generate_parameters_ex(DSA *dsa, unsigned bits,
+ const uint8_t *seed,
+ size_t seed_len, int *out_counter,
+ unsigned long *out_h,
+ BN_GENCB *cb);
+
+// DSAparams_dup returns a freshly allocated |DSA| that contains a copy of the
+// parameters from |dsa|. It returns NULL on error.
+OPENSSL_EXPORT DSA *DSAparams_dup(const DSA *dsa);
+
+
+// Key generation.
+
+// DSA_generate_key generates a public/private key pair in |dsa|, which must
+// already have parameters setup. It returns one on success and zero on
+// error.
+OPENSSL_EXPORT int DSA_generate_key(DSA *dsa);
+
+
+// Signatures.
+
+// DSA_SIG_st (aka |DSA_SIG|) contains a DSA signature as a pair of integers.
+struct DSA_SIG_st {
+ BIGNUM *r, *s;
+};
+
+// DSA_SIG_new returns a freshly allocated, DIG_SIG structure or NULL on error.
+// Both |r| and |s| in the signature will be NULL.
+OPENSSL_EXPORT DSA_SIG *DSA_SIG_new(void);
+
+// DSA_SIG_free frees the contents of |sig| and then frees |sig| itself.
+OPENSSL_EXPORT void DSA_SIG_free(DSA_SIG *sig);
+
+// DSA_do_sign returns a signature of the hash in |digest| by the key in |dsa|
+// and returns an allocated, DSA_SIG structure, or NULL on error.
+OPENSSL_EXPORT DSA_SIG *DSA_do_sign(const uint8_t *digest, size_t digest_len,
+ const DSA *dsa);
+
+// DSA_do_verify verifies that |sig| is a valid signature, by the public key in
+// |dsa|, of the hash in |digest|. It returns one if so, zero if invalid and -1
+// on error.
+//
+// WARNING: do not use. This function returns -1 for error, 0 for invalid and 1
+// for valid. However, this is dangerously different to the usual OpenSSL
+// convention and could be a disaster if a user did |if (DSA_do_verify(...))|.
+// Because of this, |DSA_check_signature| is a safer version of this.
+//
+// TODO(fork): deprecate.
+OPENSSL_EXPORT int DSA_do_verify(const uint8_t *digest, size_t digest_len,
+ DSA_SIG *sig, const DSA *dsa);
+
+// DSA_do_check_signature sets |*out_valid| to zero. Then it verifies that |sig|
+// is a valid signature, by the public key in |dsa| of the hash in |digest|
+// and, if so, it sets |*out_valid| to one.
+//
+// It returns one if it was able to verify the signature as valid or invalid,
+// and zero on error.
+OPENSSL_EXPORT int DSA_do_check_signature(int *out_valid, const uint8_t *digest,
+ size_t digest_len, DSA_SIG *sig,
+ const DSA *dsa);
+
+
+// ASN.1 signatures.
+//
+// These functions also perform DSA signature operations, but deal with ASN.1
+// encoded signatures as opposed to raw |BIGNUM|s. If you don't know what
+// encoding a DSA signature is in, it's probably ASN.1.
+
+// DSA_sign signs |digest| with the key in |dsa| and writes the resulting
+// signature, in ASN.1 form, to |out_sig| and the length of the signature to
+// |*out_siglen|. There must be, at least, |DSA_size(dsa)| bytes of space in
+// |out_sig|. It returns one on success and zero otherwise.
+//
+// (The |type| argument is ignored.)
+OPENSSL_EXPORT int DSA_sign(int type, const uint8_t *digest, size_t digest_len,
+ uint8_t *out_sig, unsigned int *out_siglen,
+ const DSA *dsa);
+
+// DSA_verify verifies that |sig| is a valid, ASN.1 signature, by the public
+// key in |dsa|, of the hash in |digest|. It returns one if so, zero if invalid
+// and -1 on error.
+//
+// (The |type| argument is ignored.)
+//
+// WARNING: do not use. This function returns -1 for error, 0 for invalid and 1
+// for valid. However, this is dangerously different to the usual OpenSSL
+// convention and could be a disaster if a user did |if (DSA_do_verify(...))|.
+// Because of this, |DSA_check_signature| is a safer version of this.
+//
+// TODO(fork): deprecate.
+OPENSSL_EXPORT int DSA_verify(int type, const uint8_t *digest,
+ size_t digest_len, const uint8_t *sig,
+ size_t sig_len, const DSA *dsa);
+
+// DSA_check_signature sets |*out_valid| to zero. Then it verifies that |sig|
+// is a valid, ASN.1 signature, by the public key in |dsa|, of the hash in
+// |digest|. If so, it sets |*out_valid| to one.
+//
+// It returns one if it was able to verify the signature as valid or invalid,
+// and zero on error.
+OPENSSL_EXPORT int DSA_check_signature(int *out_valid, const uint8_t *digest,
+ size_t digest_len, const uint8_t *sig,
+ size_t sig_len, const DSA *dsa);
+
+// DSA_size returns the size, in bytes, of an ASN.1 encoded, DSA signature
+// generated by |dsa|. Parameters must already have been setup in |dsa|.
+OPENSSL_EXPORT int DSA_size(const DSA *dsa);
+
+
+// ASN.1 encoding.
+
+// DSA_SIG_parse parses a DER-encoded DSA-Sig-Value structure from |cbs| and
+// advances |cbs|. It returns a newly-allocated |DSA_SIG| or NULL on error.
+OPENSSL_EXPORT DSA_SIG *DSA_SIG_parse(CBS *cbs);
+
+// DSA_SIG_marshal marshals |sig| as a DER-encoded DSA-Sig-Value and appends the
+// result to |cbb|. It returns one on success and zero on error.
+OPENSSL_EXPORT int DSA_SIG_marshal(CBB *cbb, const DSA_SIG *sig);
+
+// DSA_parse_public_key parses a DER-encoded DSA public key from |cbs| and
+// advances |cbs|. It returns a newly-allocated |DSA| or NULL on error.
+OPENSSL_EXPORT DSA *DSA_parse_public_key(CBS *cbs);
+
+// DSA_marshal_public_key marshals |dsa| as a DER-encoded DSA public key and
+// appends the result to |cbb|. It returns one on success and zero on
+// failure.
+OPENSSL_EXPORT int DSA_marshal_public_key(CBB *cbb, const DSA *dsa);
+
+// DSA_parse_private_key parses a DER-encoded DSA private key from |cbs| and
+// advances |cbs|. It returns a newly-allocated |DSA| or NULL on error.
+OPENSSL_EXPORT DSA *DSA_parse_private_key(CBS *cbs);
+
+// DSA_marshal_private_key marshals |dsa| as a DER-encoded DSA private key and
+// appends the result to |cbb|. It returns one on success and zero on
+// failure.
+OPENSSL_EXPORT int DSA_marshal_private_key(CBB *cbb, const DSA *dsa);
+
+// DSA_parse_parameters parses a DER-encoded Dss-Parms structure (RFC 3279)
+// from |cbs| and advances |cbs|. It returns a newly-allocated |DSA| or NULL on
+// error.
+OPENSSL_EXPORT DSA *DSA_parse_parameters(CBS *cbs);
+
+// DSA_marshal_parameters marshals |dsa| as a DER-encoded Dss-Parms structure
+// (RFC 3447) and appends the result to |cbb|. It returns one on success and
+// zero on failure.
+OPENSSL_EXPORT int DSA_marshal_parameters(CBB *cbb, const DSA *dsa);
+
+
+// Conversion.
+
+// DSA_dup_DH returns a |DH| constructed from the parameters of |dsa|. This is
+// sometimes needed when Diffie-Hellman parameters are stored in the form of
+// DSA parameters. It returns an allocated |DH| on success or NULL on error.
+OPENSSL_EXPORT DH *DSA_dup_DH(const DSA *dsa);
+
+
+// ex_data functions.
+//
+// See |ex_data.h| for details.
+
+OPENSSL_EXPORT int DSA_get_ex_new_index(long argl, void *argp,
+ CRYPTO_EX_unused *unused,
+ CRYPTO_EX_dup *dup_unused,
+ CRYPTO_EX_free *free_func);
+OPENSSL_EXPORT int DSA_set_ex_data(DSA *dsa, int idx, void *arg);
+OPENSSL_EXPORT void *DSA_get_ex_data(const DSA *dsa, int idx);
+
+
+// Deprecated functions.
+
+// d2i_DSA_SIG parses an ASN.1, DER-encoded, DSA signature from |len| bytes at
+// |*inp|. If |out_sig| is not NULL then, on exit, a pointer to the result is
+// in |*out_sig|. Note that, even if |*out_sig| is already non-NULL on entry, it
+// will not be written to. Rather, a fresh |DSA_SIG| is allocated and the
+// previous one is freed. On successful exit, |*inp| is advanced past the DER
+// structure. It returns the result or NULL on error.
+//
+// Use |DSA_SIG_parse| instead.
+OPENSSL_EXPORT DSA_SIG *d2i_DSA_SIG(DSA_SIG **out_sig, const uint8_t **inp,
+ long len);
+
+// i2d_DSA_SIG marshals |in| to an ASN.1, DER structure. If |outp| is not NULL
+// then the result is written to |*outp| and |*outp| is advanced just past the
+// output. It returns the number of bytes in the result, whether written or not,
+// or a negative value on error.
+//
+// Use |DSA_SIG_marshal| instead.
+OPENSSL_EXPORT int i2d_DSA_SIG(const DSA_SIG *in, uint8_t **outp);
+
+// d2i_DSAPublicKey parses an ASN.1, DER-encoded, DSA public key from |len|
+// bytes at |*inp|. If |out| is not NULL then, on exit, a pointer to the result
+// is in |*out|. Note that, even if |*ou| is already non-NULL on entry, it will
+// not be written to. Rather, a fresh |DSA| is allocated and the previous one is
+// freed. On successful exit, |*inp| is advanced past the DER structure. It
+// returns the result or NULL on error.
+//
+// Use |DSA_parse_public_key| instead.
+OPENSSL_EXPORT DSA *d2i_DSAPublicKey(DSA **out, const uint8_t **inp, long len);
+
+// i2d_DSAPublicKey marshals a public key from |in| to an ASN.1, DER structure.
+// If |outp| is not NULL then the result is written to |*outp| and |*outp| is
+// advanced just past the output. It returns the number of bytes in the result,
+// whether written or not, or a negative value on error.
+//
+// Use |DSA_marshal_public_key| instead.
+OPENSSL_EXPORT int i2d_DSAPublicKey(const DSA *in, uint8_t **outp);
+
+// d2i_DSAPrivateKey parses an ASN.1, DER-encoded, DSA private key from |len|
+// bytes at |*inp|. If |out| is not NULL then, on exit, a pointer to the result
+// is in |*out|. Note that, even if |*out| is already non-NULL on entry, it will
+// not be written to. Rather, a fresh |DSA| is allocated and the previous one is
+// freed. On successful exit, |*inp| is advanced past the DER structure. It
+// returns the result or NULL on error.
+//
+// Use |DSA_parse_private_key| instead.
+OPENSSL_EXPORT DSA *d2i_DSAPrivateKey(DSA **out, const uint8_t **inp, long len);
+
+// i2d_DSAPrivateKey marshals a private key from |in| to an ASN.1, DER
+// structure. If |outp| is not NULL then the result is written to |*outp| and
+// |*outp| is advanced just past the output. It returns the number of bytes in
+// the result, whether written or not, or a negative value on error.
+//
+// Use |DSA_marshal_private_key| instead.
+OPENSSL_EXPORT int i2d_DSAPrivateKey(const DSA *in, uint8_t **outp);
+
+// d2i_DSAparams parses ASN.1, DER-encoded, DSA parameters from |len| bytes at
+// |*inp|. If |out| is not NULL then, on exit, a pointer to the result is in
+// |*out|. Note that, even if |*out| is already non-NULL on entry, it will not
+// be written to. Rather, a fresh |DSA| is allocated and the previous one is
+// freed. On successful exit, |*inp| is advanced past the DER structure. It
+// returns the result or NULL on error.
+//
+// Use |DSA_parse_parameters| instead.
+OPENSSL_EXPORT DSA *d2i_DSAparams(DSA **out, const uint8_t **inp, long len);
+
+// i2d_DSAparams marshals DSA parameters from |in| to an ASN.1, DER structure.
+// If |outp| is not NULL then the result is written to |*outp| and |*outp| is
+// advanced just past the output. It returns the number of bytes in the result,
+// whether written or not, or a negative value on error.
+//
+// Use |DSA_marshal_parameters| instead.
+OPENSSL_EXPORT int i2d_DSAparams(const DSA *in, uint8_t **outp);
+
+// DSA_generate_parameters is a deprecated version of
+// |DSA_generate_parameters_ex| that creates and returns a |DSA*|. Don't use
+// it.
+OPENSSL_EXPORT DSA *DSA_generate_parameters(int bits, unsigned char *seed,
+ int seed_len, int *counter_ret,
+ unsigned long *h_ret,
+ void (*callback)(int, int, void *),
+ void *cb_arg);
+
+
+struct dsa_st {
+ long version;
+ BIGNUM *p;
+ BIGNUM *q; // == 20
+ BIGNUM *g;
+
+ BIGNUM *pub_key; // y public key
+ BIGNUM *priv_key; // x private key
+
+ int flags;
+ // Normally used to cache montgomery values
+ CRYPTO_MUTEX method_mont_lock;
+ BN_MONT_CTX *method_mont_p;
+ BN_MONT_CTX *method_mont_q;
+ CRYPTO_refcount_t references;
+ CRYPTO_EX_DATA ex_data;
+};
+
+
+#if defined(__cplusplus)
+} // extern C
+
+extern "C++" {
+
+namespace bssl {
+
+BORINGSSL_MAKE_DELETER(DSA, DSA_free)
+BORINGSSL_MAKE_DELETER(DSA_SIG, DSA_SIG_free)
+
+} // namespace bssl
+
+} // extern C++
+
+#endif
+
+#define DSA_R_BAD_Q_VALUE 100
+#define DSA_R_MISSING_PARAMETERS 101
+#define DSA_R_MODULUS_TOO_LARGE 102
+#define DSA_R_NEED_NEW_SETUP_VALUES 103
+#define DSA_R_BAD_VERSION 104
+#define DSA_R_DECODE_ERROR 105
+#define DSA_R_ENCODE_ERROR 106
+
+#endif // OPENSSL_HEADER_DSA_H
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