113d40330Schristos=pod 213d40330Schristos 313d40330Schristos=head1 NAME 413d40330Schristos 513d40330SchristosDSA_sign, DSA_sign_setup, DSA_verify - DSA signatures 613d40330Schristos 713d40330Schristos=head1 SYNOPSIS 813d40330Schristos 913d40330Schristos #include <openssl/dsa.h> 1013d40330Schristos 11*b0d17251SchristosThe following functions have been deprecated since OpenSSL 3.0, and can be 12*b0d17251Schristoshidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value, 13*b0d17251Schristossee L<openssl_user_macros(7)>: 14*b0d17251Schristos 1513d40330Schristos int DSA_sign(int type, const unsigned char *dgst, int len, 1613d40330Schristos unsigned char *sigret, unsigned int *siglen, DSA *dsa); 1713d40330Schristos 1813d40330Schristos int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp, BIGNUM **rp); 1913d40330Schristos 2013d40330Schristos int DSA_verify(int type, const unsigned char *dgst, int len, 2113d40330Schristos unsigned char *sigbuf, int siglen, DSA *dsa); 2213d40330Schristos 2313d40330Schristos=head1 DESCRIPTION 2413d40330Schristos 25*b0d17251SchristosAll of the functions described on this page are deprecated. 26*b0d17251SchristosApplications should instead use L<EVP_PKEY_sign_init(3)>, L<EVP_PKEY_sign(3)>, 27*b0d17251SchristosL<EVP_PKEY_verify_init(3)> and L<EVP_PKEY_verify(3)>. 28*b0d17251Schristos 2913d40330SchristosDSA_sign() computes a digital signature on the B<len> byte message 3013d40330Schristosdigest B<dgst> using the private key B<dsa> and places its ASN.1 DER 3113d40330Schristosencoding at B<sigret>. The length of the signature is places in 3213d40330Schristos*B<siglen>. B<sigret> must point to DSA_size(B<dsa>) bytes of memory. 3313d40330Schristos 3413d40330SchristosDSA_sign_setup() is defined only for backward binary compatibility and 3513d40330Schristosshould not be used. 3613d40330SchristosSince OpenSSL 1.1.0 the DSA type is opaque and the output of 3713d40330SchristosDSA_sign_setup() cannot be used anyway: calling this function will only 3813d40330Schristoscause overhead, and does not affect the actual signature 3913d40330Schristos(pre-)computation. 4013d40330Schristos 4113d40330SchristosDSA_verify() verifies that the signature B<sigbuf> of size B<siglen> 4213d40330Schristosmatches a given message digest B<dgst> of size B<len>. 4313d40330SchristosB<dsa> is the signer's public key. 4413d40330Schristos 4513d40330SchristosThe B<type> parameter is ignored. 4613d40330Schristos 474ce06407SchristosThe random generator must be seeded when DSA_sign() (or DSA_sign_setup()) 4813d40330Schristosis called. 494ce06407SchristosIf the automatic seeding or reseeding of the OpenSSL CSPRNG fails due to 504ce06407Schristosexternal circumstances (see L<RAND(7)>), the operation will fail. 5113d40330Schristos 5213d40330Schristos=head1 RETURN VALUES 5313d40330Schristos 5413d40330SchristosDSA_sign() and DSA_sign_setup() return 1 on success, 0 on error. 5513d40330SchristosDSA_verify() returns 1 for a valid signature, 0 for an incorrect 5613d40330Schristossignature and -1 on error. The error codes can be obtained by 5713d40330SchristosL<ERR_get_error(3)>. 5813d40330Schristos 5913d40330Schristos=head1 CONFORMING TO 6013d40330Schristos 61*b0d17251SchristosUS Federal Information Processing Standard FIPS186-4 (Digital Signature 6213d40330SchristosStandard, DSS), ANSI X9.30 6313d40330Schristos 6413d40330Schristos=head1 SEE ALSO 6513d40330Schristos 6613d40330SchristosL<DSA_new(3)>, L<ERR_get_error(3)>, L<RAND_bytes(3)>, 674ce06407SchristosL<DSA_do_sign(3)>, 684ce06407SchristosL<RAND(7)> 6913d40330Schristos 70*b0d17251Schristos=head1 HISTORY 71*b0d17251Schristos 72*b0d17251SchristosAll of these functions were deprecated in OpenSSL 3.0. 73*b0d17251Schristos 7413d40330Schristos=head1 COPYRIGHT 7513d40330Schristos 76*b0d17251SchristosCopyright 2000-2022 The OpenSSL Project Authors. All Rights Reserved. 7713d40330Schristos 78*b0d17251SchristosLicensed under the Apache License 2.0 (the "License"). You may not use 7913d40330Schristosthis file except in compliance with the License. You can obtain a copy 8013d40330Schristosin the file LICENSE in the source distribution or at 8113d40330SchristosL<https://www.openssl.org/source/license.html>. 8213d40330Schristos 8313d40330Schristos=cut 84