NAME

DSA_size, DSA_bits — get DSA signature or key size

SYNOPSIS

library “libcrypto”
#include <openssl/dsa.h> int
DSA_size(const DSA *dsa); int
DSA_bits(const DSA *dsa);

DESCRIPTION

DSA_size() returns the maximum size of an ASN.1 encoded DSA signature for the key dsa in bytes. It can be used to determine how much memory must be allocated for a DSA signature. dsa->q must not be NULL. DSA_bits() returns the number of significant bits in the public domain parameter p contained in dsa. This is also the number of bits in the public key.

RETURN VALUES

DSA_size() returns the size of the signature in bytes. DSA_bits() returns the size of the public key in bits.

SEE ALSO

DSA_get0_pqg(3), DSA_new(3), DSA_security_bits(3), DSA_sign(3)

HISTORY

DSA_size() first appeared in SSLeay 0.6.0 and has been available since OpenBSD 2.4. DSA_bits() first appeared in OpenSSL 1.1.0 and has been available since OpenBSD 7.1.