1=pod 2 3=head1 NAME 4 5EVP_SIGNATURE-DSA 6- The B<EVP_PKEY> DSA signature implementation 7 8=head1 DESCRIPTION 9 10Support for computing DSA signatures. The signature produced with 11L<EVP_PKEY_sign(3)> is DER encoded ASN.1 in the form described in 12RFC 3279, section 2.2.2. 13See L<EVP_PKEY-DSA(7)> for information related to DSA keys. 14 15=head2 Signature Parameters 16 17The following signature parameters can be set using EVP_PKEY_CTX_set_params(). 18This may be called after EVP_PKEY_sign_init() or EVP_PKEY_verify_init(), 19and before calling EVP_PKEY_sign() or EVP_PKEY_verify(). 20 21=over 4 22 23=item "digest" (B<OSSL_SIGNATURE_PARAM_DIGEST>) <UTF8 string> 24 25=item "properties" (B<OSSL_SIGNATURE_PARAM_PROPERTIES>) <UTF8 string> 26 27The settable parameters are described in L<provider-signature(7)>. 28 29=back 30 31The following signature parameters can be retrieved using 32EVP_PKEY_CTX_get_params(). 33 34=over 4 35 36=item "algorithm-id" (B<OSSL_SIGNATURE_PARAM_ALGORITHM_ID>) <octet string> 37 38=item "digest" (B<OSSL_SIGNATURE_PARAM_DIGEST>) <UTF8 string> 39 40The gettable parameters are described in L<provider-signature(7)>. 41 42=back 43 44=head1 SEE ALSO 45 46L<EVP_PKEY_CTX_set_params(3)>, 47L<EVP_PKEY_sign(3)>, 48L<EVP_PKEY_verify(3)>, 49L<provider-signature(7)>, 50 51=head1 COPYRIGHT 52 53Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved. 54 55Licensed under the Apache License 2.0 (the "License"). You may not use 56this file except in compliance with the License. You can obtain a copy 57in the file LICENSE in the source distribution or at 58L<https://www.openssl.org/source/license.html>. 59 60=cut 61