NAME

       DSA_do_sign, DSA_do_verify - raw DSA signature operations

SYNOPSIS

        #include <openssl/dsa.h>

       The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely
       by defining OPENSSL_API_COMPAT with a suitable version value, see openssl_user_macros(7):

        DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);

        int DSA_do_verify(const unsigned char *dgst, int dgst_len,
                          DSA_SIG *sig, DSA *dsa);

DESCRIPTION

       All of the functions described on this page are deprecated.  Applications should instead
       use EVP_PKEY_sign_init(3), EVP_PKEY_sign(3), EVP_PKEY_verify_init(3) and
       EVP_PKEY_verify(3).

       DSA_do_sign() computes a digital signature on the len byte message digest dgst using the
       private key dsa and returns it in a newly allocated DSA_SIG structure.

       DSA_sign_setup(3) may be used to precompute part of the signing operation in case
       signature generation is time-critical.

       DSA_do_verify() verifies that the signature sig matches a given message digest dgst of
       size len.  dsa is the signer's public key.

RETURN VALUES

       DSA_do_sign() returns the signature, NULL on error.  DSA_do_verify() returns 1 for a valid
       signature, 0 for an incorrect signature and -1 on error. The error codes can be obtained
       by ERR_get_error(3).

SEE ALSO

       DSA_new(3), ERR_get_error(3), RAND_bytes(3), DSA_SIG_new(3), DSA_sign(3)

HISTORY

       All of these functions were deprecated in OpenSSL 3.0.

COPYRIGHT

       Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.

       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 <https://www.openssl.org/source/license.html>.