Crypt::RSA::SS::PSS(3)User Contributed Perl DocumentatioCrypt::RSA::SS::PSS(3)NAMECrypt::RSA::SS::PSS - Probabilistic Signature Scheme based on RSA.
SYNOPSIS
my $pss = new Crypt::RSA::SS::PSS;
my $signature = $pss->sign (
Message => $message,
Key => $private,
) || die $pss->errstr;
my $verify = $pss->verify (
Message => $message,
Key => $key,
Signature => $signature,
) || die $pss->errstr;
DESCRIPTION
PSS (Probabilistic Signature Scheme) is a provably secure method of
creating digital signatures with RSA. "Provable" means that the
difficulty of forging signatures can be directly related to inverting
the RSA function. "Probabilistic" alludes to the randomly generated
salt value included in the signature to enhance security. For more
details on PSS, see [4] & [13].
METHODSnew()
Constructor.
version()
Returns the version number of the module.
sign()
Computes a PSS signature on a message with the private key of the
signer. In scalar context, sign() returns the computed signature. In
array context, it returns the signature and the random salt. The
signature can verified with verify() or verify_with_salt(). sign()
takes a hash argument with the following mandatory keys:
Message
Message to be signed, a string of arbitrary length.
Key Private key of the signer, a Crypt::RSA::Key::Private object.
verify()
Verifies a signature generated with sign(). The salt is recovered from
the signature and need not be passed. Returns a true value on success
and false on failure. $self->errstr is set to "Invalid signature." or
appropriate error on failure. verify() takes a hash argument with the
following mandatory keys:
Key Public key of the signer, a Crypt::RSA::Key::Public object.
Message
The original signed message, a string of arbitrary length.
Signature
Signature computed with sign(), a string.
Version
Version of the module that was used for creating the Signature.
This is an optional argument. When present, verify() will ensure
before proceeding that the installed version of the module can
successfully verify the Signature.
verify_with_salt()
Verifies a signature given the salt. Takes the same arguments as
verify() in addition to Salt, which is a 20-byte string returned by
sign() in array context.
ERROR HANDLING
See ERROR HANDLING in Crypt::RSA(3) manpage.
BIBLIOGRAPHY
See BIBLIOGRAPHY in Crypt::RSA(3) manpage.
AUTHOR
Vipul Ved Prakash, <mail@vipul.net>
SEE ALSOCrypt::RSA(3), Crypt::RSA::Primitives(3), Crypt::RSA::Keys(3),
Crypt::RSA::EME::OAEP(3)perl v5.14.1 2009-06-07 Crypt::RSA::SS::PSS(3)
