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Crypt::RSA::ES::OAEP(3User Contributed Perl DocumentatiCrypt::RSA::ES::OAEP(3)

NAME
       Crypt::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 infor-
       mation on OAEP and plaintext-aware encryption, see [3], [9] & [13].

METHODS
       new()

       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 suc-
       cess. $self->errstr is set to "Decryption Error." or appropriate error
       on failure. decrypt() takes a hash argument with the following manda-
       tory 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 suc-
	   cessfully 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 ALSO
       Crypt::RSA(3), Crypt::RSA::Primitives(3), Crypt::RSA::Keys(3),
       Crypt::RSA::SSA::PSS(3)

perl v5.8.8			  2005-10-20	       Crypt::RSA::ES::OAEP(3)
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