1 /* ====================================================================
2 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
16 * 3. All advertising materials mentioning features or use of this
17 * software must display the following acknowledgment:
18 * "This product includes software developed by the OpenSSL Project
19 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
22 * endorse or promote products derived from this software without
23 * prior written permission. For written permission, please contact
24 * openssl-core@OpenSSL.org.
26 * 5. Products derived from this software may not be called "OpenSSL"
27 * nor may "OpenSSL" appear in their names without prior written
28 * permission of the OpenSSL Project.
30 * 6. Redistributions of any form whatsoever must retain the following
32 * "This product includes software developed by the OpenSSL Project
33 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
46 * OF THE POSSIBILITY OF SUCH DAMAGE.
47 * ====================================================================
49 * This product includes cryptographic software written by Eric Young
50 * (eay@cryptsoft.com). This product includes software written by Tim
51 * Hudson (tjh@cryptsoft.com). */
53 #ifndef OPENSSL_HEADER_ECDSA_H
54 #define OPENSSL_HEADER_ECDSA_H
56 #include <openssl/base.h>
58 #include <openssl/ec_key.h>
60 #if defined(__cplusplus)
65 /* DSA contains functions for signing and verifing with the Digital Signature
66 * Algorithm over elliptic curves. */
69 /* Signing and verifing. */
71 /* ECDSA_sign signs |digest_len| bytes from |digest| with |key| and writes the
72 * resulting signature to |sig|, which must have |ECDSA_size(key)| bytes of
73 * space. On successful exit, |*sig_len| is set to the actual number of bytes
74 * written. The |type| argument should be zero. It returns one on success and
76 OPENSSL_EXPORT int ECDSA_sign(int type, const uint8_t *digest,
77 size_t digest_len, uint8_t *sig,
78 unsigned int *sig_len, EC_KEY *key);
80 /* ECDSA_verify verifies that |sig_len| bytes from |sig| constitute a valid
81 * signature by |key| of |digest|. (The |type| argument should be zero.) It
82 * returns one on success or zero if the signature is invalid or an error
84 OPENSSL_EXPORT int ECDSA_verify(int type, const uint8_t *digest,
85 size_t digest_len, const uint8_t *sig,
86 size_t sig_len, EC_KEY *key);
88 /* ECDSA_size returns the maximum size of an ECDSA signature using |key|. It
89 * returns zero on error. */
90 OPENSSL_EXPORT size_t ECDSA_size(const EC_KEY *key);
93 /* Low-level signing and verification.
95 * Low-level functions handle signatures as |ECDSA_SIG| structures which allow
96 * the two values in an ECDSA signature to be handled separately. */
103 /* ECDSA_SIG_new returns a fresh |ECDSA_SIG| structure or NULL on error. */
104 OPENSSL_EXPORT ECDSA_SIG *ECDSA_SIG_new(void);
106 /* ECDSA_SIG_free frees |sig| its member |BIGNUM|s. */
107 OPENSSL_EXPORT void ECDSA_SIG_free(ECDSA_SIG *sig);
109 /* ECDSA_sign signs |digest_len| bytes from |digest| with |key| and returns the
110 * resulting signature structure, or NULL on error.
112 * TODO(fork): remove this function. */
113 OPENSSL_EXPORT ECDSA_SIG *ECDSA_do_sign(const uint8_t *digest,
114 size_t digest_len, EC_KEY *key);
116 /* ECDSA_verify verifies that |sig| constitutes a valid signature by |key| of
117 * |digest|. It returns one on success or zero if the signature is invalid or
120 * TODO(fork): remove this function. */
121 OPENSSL_EXPORT int ECDSA_do_verify(const uint8_t *digest, size_t digest_len,
122 const ECDSA_SIG *sig, EC_KEY *key);
125 /* Signing with precomputation.
127 * Parts of the ECDSA signature can be independent of the message to be signed
128 * thus it's possible to precompute them and reduce the signing latency.
130 * TODO(fork): remove support for this as it cannot support safe-randomness. */
132 /* ECDSA_sign_setup precomputes parts of an ECDSA signing operation. It sets
133 * |*kinv| and |*rp| to the precomputed values and uses the |ctx| argument, if
134 * not NULL. It returns one on success and zero otherwise. */
135 OPENSSL_EXPORT int ECDSA_sign_setup(EC_KEY *eckey, BN_CTX *ctx, BIGNUM **kinv,
138 /* ECDSA_do_sign_ex is the same as |ECDSA_do_sign| but takes precomputed values
139 * as generated by |ECDSA_sign_setup|. */
140 OPENSSL_EXPORT ECDSA_SIG *ECDSA_do_sign_ex(const uint8_t *digest,
142 const BIGNUM *kinv, const BIGNUM *rp,
145 /* ECDSA_sign_ex is the same as |ECDSA_sign| but takes precomputed values as
146 * generated by |ECDSA_sign_setup|. */
147 OPENSSL_EXPORT int ECDSA_sign_ex(int type, const uint8_t *digest,
148 size_t digest_len, uint8_t *sig,
149 unsigned int *sig_len, const BIGNUM *kinv,
150 const BIGNUM *rp, EC_KEY *eckey);
153 /* ASN.1 functions. */
155 /* d2i_ECDSA_SIG parses an ASN.1, DER-encoded, signature from |len| bytes at
156 * |*inp|. If |out| is not NULL then, on exit, a pointer to the result is in
157 * |*out|. If |*out| is already non-NULL on entry then the result is written
158 * directly into |*out|, otherwise a fresh |ECDSA_SIG| is allocated. On
159 * successful exit, |*inp| is advanced past the DER structure. It returns the
160 * result or NULL on error. */
161 OPENSSL_EXPORT ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **out, const uint8_t **inp,
164 /* i2d_ECDSA_SIG marshals a signature from |sig| to an ASN.1, DER
165 * structure. If |outp| is not NULL then the result is written to |*outp| and
166 * |*outp| is advanced just past the output. It returns the number of bytes in
167 * the result, whether written or not, or a negative value on error. */
168 OPENSSL_EXPORT int i2d_ECDSA_SIG(const ECDSA_SIG *sig, uint8_t **outp);
171 #if defined(__cplusplus)
175 #define ECDSA_F_digest_to_bn 100
176 #define ECDSA_F_ECDSA_do_verify 101
177 #define ECDSA_F_ECDSA_sign_setup 102
178 #define ECDSA_F_ECDSA_do_sign_ex 103
179 #define ECDSA_F_ECDSA_sign_ex 104
180 #define ECDSA_F_ecdsa_sign_setup 105
181 #define ECDSA_R_RANDOM_NUMBER_GENERATION_FAILED 100
182 #define ECDSA_R_NEED_NEW_SETUP_VALUES 101
183 #define ECDSA_R_MISSING_PARAMETERS 102
184 #define ECDSA_R_BAD_SIGNATURE 103
185 #define ECDSA_R_NOT_IMPLEMENTED 104
187 #endif /* OPENSSL_HEADER_ECDSA_H */