=head1 NAME
-ECDSA_SIG_get0, ECDSA_SIG_set0,
-ECDSA_SIG_new, ECDSA_SIG_free, i2d_ECDSA_SIG, d2i_ECDSA_SIG, ECDSA_size,
-ECDSA_sign, ECDSA_do_sign, ECDSA_verify, ECDSA_do_verify, ECDSA_sign_setup,
-ECDSA_sign_ex, ECDSA_do_sign_ex - low level elliptic curve digital signature
-algorithm (ECDSA) functions
+ECDSA_SIG_get0, ECDSA_SIG_get0_r, ECDSA_SIG_get0_s, ECDSA_SIG_set0,
+ECDSA_SIG_new, ECDSA_SIG_free, ECDSA_size, ECDSA_sign, ECDSA_do_sign,
+ECDSA_verify, ECDSA_do_verify, ECDSA_sign_setup, ECDSA_sign_ex,
+ECDSA_do_sign_ex - low level elliptic curve digital signature algorithm (ECDSA)
+functions
=head1 SYNOPSIS
ECDSA_SIG *ECDSA_SIG_new(void);
void ECDSA_SIG_free(ECDSA_SIG *sig);
void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps);
+ const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig);
+ const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig);
int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s);
- int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **pp);
- ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **sig, const unsigned char **pp, long len);
+
+Deprecated since OpenSSL 3.0, can be hidden entirely by defining
+B<OPENSSL_API_COMPAT> with a suitable version value, see
+L<openssl_user_macros(7)>:
+
int ECDSA_size(const EC_KEY *eckey);
int ECDSA_sign(int type, const unsigned char *dgst, int dgstlen,
=head1 DESCRIPTION
-Note: these functions provide a low level interface to ECDSA. Most
-applications should use the higher level B<EVP> interface such as
-L<EVP_DigestSignInit(3)> or L<EVP_DigestVerifyInit(3)> instead.
-
B<ECDSA_SIG> is an opaque structure consisting of two BIGNUMs for the
B<r> and B<s> value of an ECDSA signature (see X9.62 or FIPS 186-2).
ECDSA_SIG_free() frees the B<ECDSA_SIG> structure B<sig>.
ECDSA_SIG_get0() returns internal pointers the B<r> and B<s> values contained
-in B<sig>.
+in B<sig> and stores them in B<*pr> and B<*ps>, respectively.
+The pointer B<pr> or B<ps> can be NULL, in which case the corresponding value
+is not returned.
+
+The values B<r>, B<s> can also be retrieved separately by the corresponding
+function ECDSA_SIG_get0_r() and ECDSA_SIG_get0_s(), respectively.
The B<r> and B<s> values can be set by calling ECDSA_SIG_set0() and passing the
new values for B<r> and B<s> as parameters to the function. Calling this
and therefore the values that have been passed in should not be freed directly
after this function has been called.
-i2d_ECDSA_SIG() creates the DER encoding of the ECDSA signature B<sig> and
-writes the encoded signature to B<*pp> (note: if B<pp> is NULL i2d_ECDSA_SIG()
-returns the expected length in bytes of the DER encoded signature).
-i2d_ECDSA_SIG() returns the length of the DER encoded signature (or 0 on
-error).
+See L<i2d_ECDSA_SIG(3)> and L<d2i_ECDSA_SIG(3)> for information about encoding
+and decoding ECDSA signatures to/from DER.
-d2i_ECDSA_SIG() decodes a DER encoded ECDSA signature and returns the decoded
-signature in a newly allocated B<ECDSA_SIG> structure. B<*sig> points to the
-buffer containing the DER encoded signature of size B<len>.
+All of the functions described below are deprecated. Applications should
+use the higher level B<EVP> interface such as L<EVP_DigestSignInit(3)>
+or L<EVP_DigestVerifyInit(3)> instead.
ECDSA_size() returns the maximum length of a DER encoded ECDSA signature
-created with the private EC key B<eckey>.
+created with the private EC key B<eckey>. To obtain the actual signature
+size use L<EVP_PKEY_sign(3)> with a NULL B<sig> parameter.
ECDSA_sign() computes a digital signature of the B<dgstlen> bytes hash value
B<dgst> using the private EC key B<eckey>. The DER encoded signatures is
=head1 RETURN VALUES
+ECDSA_SIG_new() returns NULL if the allocation fails.
+
ECDSA_SIG_set0() returns 1 on success or 0 on failure.
+ECDSA_SIG_get0_r() and ECDSA_SIG_get0_s() return the corresponding value,
+or NULL if it is unset.
+
ECDSA_size() returns the maximum length signature or 0 on error.
ECDSA_sign(), ECDSA_sign_ex() and ECDSA_sign_setup() return 1 if successful
int ret;
ECDSA_SIG *sig;
EC_KEY *eckey;
+
eckey = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
if (eckey == NULL)
/* error */
unsigned char *buffer, *pp;
int buf_len;
+
buf_len = ECDSA_size(eckey);
buffer = OPENSSL_malloc(buf_len);
pp = buffer;
=head1 SEE ALSO
-L<DSA_new(3)>,
+L<EC_KEY_new(3)>,
L<EVP_DigestSignInit(3)>,
-L<EVP_DigestVerifyInit(3)>
+L<EVP_DigestVerifyInit(3)>,
+L<EVP_PKEY_sign(3)>
+L<i2d_ECDSA_SIG(3)>,
+L<d2i_ECDSA_SIG(3)>
+
+=head1 HISTORY
+
+The ECDSA_size(), ECDSA_sign(), ECDSA_do_sign(), ECDSA_verify(),
+ECDSA_do_verify(), ECDSA_sign_setup(), ECDSA_sign_ex() and ECDSA_do_sign_ex()
+functions were deprecated in OpenSSL 3.0.
=head1 COPYRIGHT
-Copyright 2004-2016 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2004-2020 The OpenSSL Project Authors. All Rights Reserved.
-Licensed under the OpenSSL license (the "License"). You may not use
+Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
projects / openssl.git / blobdiff