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+=head1 NAME
+DSA_do_sign, DSA_do_verify - raw DSA signature operations
+=head1 SYNOPSIS
+ #include <openssl/dsa.h>
+ 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);
+DSA_do_sign() computes a digital signature on the B<len> byte message
+digest B<dgst> using the private key B<dsa> and returns it in a
+newly allocated B<DSA_SIG> structure.
+L<DSA_sign_setup(3)> may be used to precompute part
+of the signing operation in case signature generation is
+DSA_do_verify() verifies that the signature B<sig> matches a given
+message digest B<dgst> of size B<len>. B<dsa> is the signer's public
+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
+=head1 SEE ALSO
+L<DSA_new(3)>, L<ERR_get_error(3)>, L<RAND_bytes(3)>,
+Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
+Licensed under the OpenSSL license (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