OpenSSL

Cryptography and SSL/TLS Toolkit

DSA_size

NAME

DSA_size, DSA_bits, DSA_security_bits - get DSA signature size, key bits or security bits

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):

 int DSA_bits(const DSA *dsa);

 int DSA_size(const DSA *dsa);

 int DSA_security_bits(const DSA *dsa);

DESCRIPTION

All of the functions described on this page are deprecated. Applications should instead use EVP_PKEY_get_bits(3), EVP_PKEY_get_security_bits(3) and EVP_PKEY_get_size(3).

DSA_bits() returns the number of bits in key dsa: this is the number of bits in the p parameter.

DSA_size() returns the maximum size of an ASN.1 encoded DSA signature for key dsa in bytes. It can be used to determine how much memory must be allocated for a DSA signature.

DSA_security_bits() returns the number of security bits of the given dsa key. See BN_security_bits(3).

RETURN VALUES

DSA_security_bits() returns the number of security bits in the key, or -1 if dsa doesn't hold any key parameters.

DSA_bits() returns the number of bits in the key, or -1 if dsa doesn't hold any key parameters.

DSA_size() returns the signature size in bytes, or -1 if dsa doesn't hold any key parameters.

SEE ALSO

EVP_PKEY_get_bits(3), EVP_PKEY_get_security_bits(3), EVP_PKEY_get_size(3), DSA_new(3), DSA_sign(3)

HISTORY

All of these functions were deprecated in OpenSSL 3.0.

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.