include/openssl/ecdsa.h - boringssl - Git at Google

 /* ====================================================================
  * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
  *
  * 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 above 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 acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  *
  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  *    endorse or promote products derived from this software without
  *    prior written permission. For written permission, please contact
  *    openssl-core@OpenSSL.org.
  *
  * 5. Products derived from this software may not be called "OpenSSL"
  *    nor may "OpenSSL" appear in their names without prior written
  *    permission of the OpenSSL Project.
  *
  * 6. Redistributions of any form whatsoever must retain the following
  *    acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  *
  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  * EXPRESSED 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 OpenSSL PROJECT OR
  * ITS 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.
  * ====================================================================
  *
  * This product includes cryptographic software written by Eric Young
  * (eay@cryptsoft.com).  This product includes software written by Tim
  * Hudson (tjh@cryptsoft.com). */

 #ifndef OPENSSL_HEADER_ECDSA_H
 #define OPENSSL_HEADER_ECDSA_H

 #include <openssl/base.h>

 #include <openssl/ec_key.h>

 #if defined(__cplusplus)
 extern "C" {
 #endif


 // ECDSA contains functions for signing and verifying with the Digital Signature
 // Algorithm over elliptic curves.


 // Signing and verifying.

 // ECDSA_sign signs |digest_len| bytes from |digest| with |key| and writes the
 // resulting signature to |sig|, which must have |ECDSA_size(key)| bytes of
 // space. On successful exit, |*sig_len| is set to the actual number of bytes
 // written. The |type| argument should be zero. It returns one on success and
 // zero otherwise.
 OPENSSL_EXPORT int ECDSA_sign(int type, const uint8_t *digest,
                               size_t digest_len, uint8_t *sig,
                               unsigned int *sig_len, const EC_KEY *key);

 // ECDSA_verify verifies that |sig_len| bytes from |sig| constitute a valid
 // signature by |key| of |digest|. (The |type| argument should be zero.) It
 // returns one on success or zero if the signature is invalid or an error
 // occurred.
 OPENSSL_EXPORT int ECDSA_verify(int type, const uint8_t *digest,
                                 size_t digest_len, const uint8_t *sig,
                                 size_t sig_len, const EC_KEY *key);

 // ECDSA_size returns the maximum size of an ECDSA signature using |key|. It
 // returns zero on error.
 OPENSSL_EXPORT size_t ECDSA_size(const EC_KEY *key);


 // Low-level signing and verification.
 //
 // Low-level functions handle signatures as |ECDSA_SIG| structures which allow
 // the two values in an ECDSA signature to be handled separately.

 struct ecdsa_sig_st {
   BIGNUM *r;
   BIGNUM *s;
 };

 // ECDSA_SIG_new returns a fresh |ECDSA_SIG| structure or NULL on error.
 OPENSSL_EXPORT ECDSA_SIG *ECDSA_SIG_new(void);

 // ECDSA_SIG_free frees |sig| its member |BIGNUM|s.
 OPENSSL_EXPORT void ECDSA_SIG_free(ECDSA_SIG *sig);

 // ECDSA_do_sign signs |digest_len| bytes from |digest| with |key| and returns
 // the resulting signature structure, or NULL on error.
 OPENSSL_EXPORT ECDSA_SIG *ECDSA_do_sign(const uint8_t *digest,
                                         size_t digest_len, const EC_KEY *key);

 // ECDSA_do_verify verifies that |sig| constitutes a valid signature by |key|
 // of |digest|. It returns one on success or zero if the signature is invalid
 // or on error.
 OPENSSL_EXPORT int ECDSA_do_verify(const uint8_t *digest, size_t digest_len,
                                    const ECDSA_SIG *sig, const EC_KEY *key);


 // Signing with precomputation.
 //
 // Parts of the ECDSA signature can be independent of the message to be signed
 // thus it's possible to precompute them and reduce the signing latency.
 //
 // TODO(fork): remove support for this as it cannot support safe-randomness.

 // ECDSA_sign_setup precomputes parts of an ECDSA signing operation. It sets
 // |*kinv| and |*rp| to the precomputed values and uses the |ctx| argument, if
 // not NULL. It returns one on success and zero otherwise.
 OPENSSL_EXPORT int ECDSA_sign_setup(const EC_KEY *eckey, BN_CTX *ctx,
                                     BIGNUM **kinv, BIGNUM **rp);

 // ECDSA_do_sign_ex is the same as |ECDSA_do_sign| but takes precomputed values
 // as generated by |ECDSA_sign_setup|.
 OPENSSL_EXPORT ECDSA_SIG *ECDSA_do_sign_ex(const uint8_t *digest,
                                            size_t digest_len,
                                            const BIGNUM *kinv, const BIGNUM *rp,
                                            const EC_KEY *eckey);

 // ECDSA_sign_ex is the same as |ECDSA_sign| but takes precomputed values as
 // generated by |ECDSA_sign_setup|.
 OPENSSL_EXPORT int ECDSA_sign_ex(int type, const uint8_t *digest,
                                  size_t digest_len, uint8_t *sig,
                                  unsigned int *sig_len, const BIGNUM *kinv,
                                  const BIGNUM *rp, const EC_KEY *eckey);


 // ASN.1 functions.

 // ECDSA_SIG_parse parses a DER-encoded ECDSA-Sig-Value structure from |cbs| and
 // advances |cbs|. It returns a newly-allocated |ECDSA_SIG| or NULL on error.
 OPENSSL_EXPORT ECDSA_SIG *ECDSA_SIG_parse(CBS *cbs);

 // ECDSA_SIG_from_bytes parses |in| as a DER-encoded ECDSA-Sig-Value structure.
 // It returns a newly-allocated |ECDSA_SIG| structure or NULL on error.
 OPENSSL_EXPORT ECDSA_SIG *ECDSA_SIG_from_bytes(const uint8_t *in,
                                                size_t in_len);

 // ECDSA_SIG_marshal marshals |sig| as a DER-encoded ECDSA-Sig-Value and appends
 // the result to |cbb|. It returns one on success and zero on error.
 OPENSSL_EXPORT int ECDSA_SIG_marshal(CBB *cbb, const ECDSA_SIG *sig);

 // ECDSA_SIG_to_bytes marshals |sig| as a DER-encoded ECDSA-Sig-Value and, on
 // success, sets |*out_bytes| to a newly allocated buffer containing the result
 // and returns one. Otherwise, it returns zero. The result should be freed with
 // |OPENSSL_free|.
 OPENSSL_EXPORT int ECDSA_SIG_to_bytes(uint8_t **out_bytes, size_t *out_len,
                                       const ECDSA_SIG *sig);

 // ECDSA_SIG_max_len returns the maximum length of a DER-encoded ECDSA-Sig-Value
 // structure for a group whose order is represented in |order_len| bytes, or
 // zero on overflow.
 OPENSSL_EXPORT size_t ECDSA_SIG_max_len(size_t order_len);


 // Deprecated functions.

 // d2i_ECDSA_SIG parses an ASN.1, DER-encoded, signature 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 |ECDSA_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.
 OPENSSL_EXPORT ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **out, const uint8_t **inp,
                                         long len);

 // i2d_ECDSA_SIG marshals a signature from |sig| 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.
 OPENSSL_EXPORT int i2d_ECDSA_SIG(const ECDSA_SIG *sig, uint8_t **outp);


 #if defined(__cplusplus)
 }  // extern C

 extern "C++" {

 namespace bssl {

 BORINGSSL_MAKE_DELETER(ECDSA_SIG, ECDSA_SIG_free)

 }  // namespace bssl

 }  // extern C++

 #endif

 #define ECDSA_R_BAD_SIGNATURE 100
 #define ECDSA_R_MISSING_PARAMETERS 101
 #define ECDSA_R_NEED_NEW_SETUP_VALUES 102
 #define ECDSA_R_NOT_IMPLEMENTED 103
 #define ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED 104
 #define ECDSA_R_ENCODE_ERROR 105

 #endif  // OPENSSL_HEADER_ECDSA_H
	/* ====================================================================
	* Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
	*
	* 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 above 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 acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	*
	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	* endorse or promote products derived from this software without
	* prior written permission. For written permission, please contact
	* openssl-core@OpenSSL.org.
	*
	* 5. Products derived from this software may not be called "OpenSSL"
	* nor may "OpenSSL" appear in their names without prior written
	* permission of the OpenSSL Project.
	*
	* 6. Redistributions of any form whatsoever must retain the following
	* acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	*
	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	* EXPRESSED 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 OpenSSL PROJECT OR
	* ITS 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.
	* ====================================================================
	*
	* This product includes cryptographic software written by Eric Young
	* (eay@cryptsoft.com). This product includes software written by Tim
	* Hudson (tjh@cryptsoft.com). */

	#ifndef OPENSSL_HEADER_ECDSA_H
	#define OPENSSL_HEADER_ECDSA_H

	#include <openssl/base.h>

	#include <openssl/ec_key.h>

	#if defined(__cplusplus)
	extern "C" {
	#endif


	// ECDSA contains functions for signing and verifying with the Digital Signature
	// Algorithm over elliptic curves.


	// Signing and verifying.

	// ECDSA_sign signs \|digest_len\| bytes from \|digest\| with \|key\| and writes the
	// resulting signature to \|sig\|, which must have \|ECDSA_size(key)\| bytes of
	// space. On successful exit, \|*sig_len\| is set to the actual number of bytes
	// written. The \|type\| argument should be zero. It returns one on success and
	// zero otherwise.
	OPENSSL_EXPORT int ECDSA_sign(int type, const uint8_t *digest,
	size_t digest_len, uint8_t *sig,
	unsigned int sig_len, const EC_KEY key);

	// ECDSA_verify verifies that \|sig_len\| bytes from \|sig\| constitute a valid
	// signature by \|key\| of \|digest\|. (The \|type\| argument should be zero.) It
	// returns one on success or zero if the signature is invalid or an error
	// occurred.
	OPENSSL_EXPORT int ECDSA_verify(int type, const uint8_t *digest,
	size_t digest_len, const uint8_t *sig,
	size_t sig_len, const EC_KEY *key);

	// ECDSA_size returns the maximum size of an ECDSA signature using \|key\|. It
	// returns zero on error.
	OPENSSL_EXPORT size_t ECDSA_size(const EC_KEY *key);


	// Low-level signing and verification.
	//
	// Low-level functions handle signatures as \|ECDSA_SIG\| structures which allow
	// the two values in an ECDSA signature to be handled separately.

	struct ecdsa_sig_st {
	BIGNUM *r;
	BIGNUM *s;
	};

	// ECDSA_SIG_new returns a fresh \|ECDSA_SIG\| structure or NULL on error.
	OPENSSL_EXPORT ECDSA_SIG *ECDSA_SIG_new(void);

	// ECDSA_SIG_free frees \|sig\| its member \|BIGNUM\|s.
	OPENSSL_EXPORT void ECDSA_SIG_free(ECDSA_SIG *sig);

	// ECDSA_do_sign signs \|digest_len\| bytes from \|digest\| with \|key\| and returns
	// the resulting signature structure, or NULL on error.
	OPENSSL_EXPORT ECDSA_SIG ECDSA_do_sign(const uint8_t digest,
	size_t digest_len, const EC_KEY *key);

	// ECDSA_do_verify verifies that \|sig\| constitutes a valid signature by \|key\|
	// of \|digest\|. It returns one on success or zero if the signature is invalid
	// or on error.
	OPENSSL_EXPORT int ECDSA_do_verify(const uint8_t *digest, size_t digest_len,
	const ECDSA_SIG sig, const EC_KEY key);


	// Signing with precomputation.
	//
	// Parts of the ECDSA signature can be independent of the message to be signed
	// thus it's possible to precompute them and reduce the signing latency.
	//
	// TODO(fork): remove support for this as it cannot support safe-randomness.

	// ECDSA_sign_setup precomputes parts of an ECDSA signing operation. It sets
	// \|kinv\| and \|rp\| to the precomputed values and uses the \|ctx\| argument, if
	// not NULL. It returns one on success and zero otherwise.
	OPENSSL_EXPORT int ECDSA_sign_setup(const EC_KEY eckey, BN_CTX ctx,
	BIGNUM kinv, BIGNUM rp);

	// ECDSA_do_sign_ex is the same as \|ECDSA_do_sign\| but takes precomputed values
	// as generated by \|ECDSA_sign_setup\|.
	OPENSSL_EXPORT ECDSA_SIG ECDSA_do_sign_ex(const uint8_t digest,
	size_t digest_len,
	const BIGNUM kinv, const BIGNUM rp,
	const EC_KEY *eckey);

	// ECDSA_sign_ex is the same as \|ECDSA_sign\| but takes precomputed values as
	// generated by \|ECDSA_sign_setup\|.
	OPENSSL_EXPORT int ECDSA_sign_ex(int type, const uint8_t *digest,
	size_t digest_len, uint8_t *sig,
	unsigned int sig_len, const BIGNUM kinv,
	const BIGNUM rp, const EC_KEY eckey);


	// ASN.1 functions.

	// ECDSA_SIG_parse parses a DER-encoded ECDSA-Sig-Value structure from \|cbs\| and
	// advances \|cbs\|. It returns a newly-allocated \|ECDSA_SIG\| or NULL on error.
	OPENSSL_EXPORT ECDSA_SIG ECDSA_SIG_parse(CBS cbs);

	// ECDSA_SIG_from_bytes parses \|in\| as a DER-encoded ECDSA-Sig-Value structure.
	// It returns a newly-allocated \|ECDSA_SIG\| structure or NULL on error.
	OPENSSL_EXPORT ECDSA_SIG ECDSA_SIG_from_bytes(const uint8_t in,
	size_t in_len);

	// ECDSA_SIG_marshal marshals \|sig\| as a DER-encoded ECDSA-Sig-Value and appends
	// the result to \|cbb\|. It returns one on success and zero on error.
	OPENSSL_EXPORT int ECDSA_SIG_marshal(CBB cbb, const ECDSA_SIG sig);

	// ECDSA_SIG_to_bytes marshals \|sig\| as a DER-encoded ECDSA-Sig-Value and, on
	// success, sets \|*out_bytes\| to a newly allocated buffer containing the result
	// and returns one. Otherwise, it returns zero. The result should be freed with
	// \|OPENSSL_free\|.
	OPENSSL_EXPORT int ECDSA_SIG_to_bytes(uint8_t *out_bytes, size_t out_len,
	const ECDSA_SIG *sig);

	// ECDSA_SIG_max_len returns the maximum length of a DER-encoded ECDSA-Sig-Value
	// structure for a group whose order is represented in \|order_len\| bytes, or
	// zero on overflow.
	OPENSSL_EXPORT size_t ECDSA_SIG_max_len(size_t order_len);


	// Deprecated functions.

	// d2i_ECDSA_SIG parses an ASN.1, DER-encoded, signature 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 \|ECDSA_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.
	OPENSSL_EXPORT ECDSA_SIG d2i_ECDSA_SIG(ECDSA_SIG out, const uint8_t *inp,
	long len);

	// i2d_ECDSA_SIG marshals a signature from \|sig\| 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.
	OPENSSL_EXPORT int i2d_ECDSA_SIG(const ECDSA_SIG sig, uint8_t *outp);


	#if defined(__cplusplus)
	} // extern C

	extern "C++" {

	namespace bssl {

	BORINGSSL_MAKE_DELETER(ECDSA_SIG, ECDSA_SIG_free)

	} // namespace bssl

	} // extern C++

	#endif

	#define ECDSA_R_BAD_SIGNATURE 100
	#define ECDSA_R_MISSING_PARAMETERS 101
	#define ECDSA_R_NEED_NEW_SETUP_VALUES 102
	#define ECDSA_R_NOT_IMPLEMENTED 103
	#define ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED 104
	#define ECDSA_R_ENCODE_ERROR 105

	#endif // OPENSSL_HEADER_ECDSA_H