| /* ==================================================================== |
| * 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_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, 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, 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. */ |
| |
| /* 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 */ |
| #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 */ |
