DSA_size.3ossl - Man Page

get DSA signature size, key bits or security bits

Synopsis

 #include <openssl/dsa.h>

Deprecated since OpenSSL 3.0, 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.

Referenced By

BN_num_bytes.3ossl(3), DSA_get0_pqg.3ossl(3), DSA_meth_new.3ossl(3).

The man pages DSA_bits.3ossl(3) and DSA_security_bits.3ossl(3) are aliases of DSA_size.3ossl(3).

2021-09-09 3.0.0 OpenSSL