- /* ====================================================================
- * 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 verifing. */
-
- /* 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, 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
- * occured. */
- OPENSSL_EXPORT int ECDSA_verify(int type, const uint8_t *digest,
- size_t digest_len, const uint8_t *sig,
- size_t sig_len, 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_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, EC_KEY *key);
-
- /* ECDSA_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, 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(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,
- 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, EC_KEY *eckey);
-
-
- /* ASN.1 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|. If |*out| is already non-NULL on entry then the result is written
- * directly into |*out|, otherwise a fresh |ECDSA_SIG| is allocated. 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 */
- #endif
-
- #define ECDSA_F_ECDSA_do_sign_ex 100
- #define ECDSA_F_ECDSA_do_verify 101
- #define ECDSA_F_ECDSA_sign_ex 102
- #define ECDSA_F_digest_to_bn 103
- #define ECDSA_F_ecdsa_sign_setup 104
- #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
-
- #endif /* OPENSSL_HEADER_ECDSA_H */
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