Crypt::RSA::ES::OAEP(3User Contributed Perl DocumentatiCrypt::RSA::ES::OAEP(3)NAMECrypt::RSA::ES::OAEP - Plaintext-aware encryption with RSA.
SYNOPSIS
my $oaep = new Crypt::RSA::ES::OAEP;
my $ct = $oaep->encrypt( Key => $key, Message => $message ) ||
die $oaep->errstr;
my $pt = $oaep->decrypt( Key => $key, Cyphertext => $ct ) ||
die $oaep->errstr;
DESCRIPTION
This module implements Optimal Asymmetric Encryption, a plaintext-aware
encryption scheme based on RSA. The notion of plaintext-aware implies
it's computationally infeasible to obtain full or partial information
about a message from a cyphertext, and computationally infeasible to
generate a valid cyphertext without knowing the corresponding message.
Plaintext-aware schemes, such as OAEP, are semantically secure, non-
malleable and secure against chosen-ciphertext attack. For more
information on OAEP and plaintext-aware encryption, see [3], [9] &
[13].
METHODSnew()
Constructor.
version()
Returns the version number of the module.
encrypt()
Encrypts a string with a public key and returns the encrypted string on
success. encrypt() takes a hash argument with the following mandatory
keys:
Message
A string to be encrypted. The length of this string should not
exceed k-42 octets, where k is the octet length of the RSA modulus.
If Message is longer than k-42, the method will fail and set
$self->errstr to "Message too long." This means the key must be at
least _336_ bits long if you are to use OAEP.
Key Public key of the recipient, a Crypt::RSA::Key::Public object.
decrypt()
Decrypts cyphertext with a private key and returns plaintext on
success. $self->errstr is set to "Decryption Error." or appropriate
error on failure. decrypt() takes a hash argument with the following
mandatory keys:
Cyphertext
A string encrypted with encrypt(). The length of the cyphertext
must be k octets, where k is the length of the RSA modulus.
Key Private key of the receiver, a Crypt::RSA::Key::Private object.
Version
Version of the module that was used for creating the Cyphertext.
This is an optional argument. When present, decrypt() will ensure
before proceeding that the installed version of the module can
successfully decrypt the Cyphertext.
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::SSA::PSS(3)perl v5.14.1 2009-06-07 Crypt::RSA::ES::OAEP(3)