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.IX Title "Crypt::RSA::ES::OAEP 3"
.TH Crypt::RSA::ES::OAEP 3 "2009-06-06" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
Crypt::RSA::ES::OAEP \- Plaintext\-aware encryption with RSA. 
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    my $oaep = new Crypt::RSA::ES::OAEP;
.Ve
.PP
.Vb 2
\&    my $ct = $oaep->encrypt( Key => $key, Message => $message ) || 
\&                die $oaep->errstr;
.Ve
.PP
.Vb 2
\&    my $pt = $oaep->decrypt( Key => $key, Cyphertext => $ct )   || 
\&                die $oaep->errstr;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module implements Optimal Asymmetric Encryption, a plaintext-aware
encryption scheme based on \s-1RSA\s0. The notion of plaintext-aware implies it's
computationally infeasible to obtain full or partial information about a
message from a cyphertext, and computationally infeasible to generate a
valid cyphertext without knowing the corresponding message.
Plaintext-aware schemes, such as \s-1OAEP\s0, are semantically secure,
non-malleable and secure against chosen-ciphertext attack. For more
information on \s-1OAEP\s0 and plaintext-aware encryption, see [3], [9] & [13].
.SH "METHODS"
.IX Header "METHODS"
.Sh "\fB\fP\f(BInew()\fP\fB\fP"
.IX Subsection "new()"
Constructor. 
.Sh "\fB\fP\f(BIversion()\fP\fB\fP"
.IX Subsection "version()"
Returns the version number of the module.
.Sh "\fB\fP\f(BIencrypt()\fP\fB\fP"
.IX Subsection "encrypt()"
Encrypts a string with a public key and returns the encrypted string
on success. \fIencrypt()\fR takes a hash argument with the following
mandatory keys:
.IP "\fBMessage\fR" 4
.IX Item "Message"
A string to be encrypted. The length of this string should not exceed k\-42
octets, where k is the octet length of the \s-1RSA\s0 modulus. If Message is
longer than k\-42, the method will fail and set \f(CW$self\fR\->errstr to \*(L"Message
too long.\*(R" This means the key must be at least _336_ bits long if you are
to use \s-1OAEP\s0.
.IP "\fBKey\fR" 4
.IX Item "Key"
Public key of the recipient, a Crypt::RSA::Key::Public object.
.Sh "\fB\fP\f(BIdecrypt()\fP\fB\fP"
.IX Subsection "decrypt()"
Decrypts cyphertext with a private key and returns plaintext on
success. \f(CW$self\fR\->errstr is set to \*(L"Decryption Error.\*(R" or appropriate
error on failure. \fIdecrypt()\fR takes a hash argument with the following
mandatory keys:
.IP "\fBCyphertext\fR" 4
.IX Item "Cyphertext"
A string encrypted with \fIencrypt()\fR. The length of the cyphertext must be k
octets, where k is the length of the \s-1RSA\s0 modulus.
.IP "\fBKey\fR" 4
.IX Item "Key"
Private key of the receiver, a Crypt::RSA::Key::Private object.
.IP "\fBVersion\fR" 4
.IX Item "Version"
Version of the module that was used for creating the Cyphertext. This is
an optional argument. When present, \fIdecrypt()\fR will ensure before
proceeding that the installed version of the module can successfully
decrypt the Cyphertext.
.SH "ERROR HANDLING"
.IX Header "ERROR HANDLING"
See \s-1ERROR\s0 \s-1HANDLING\s0 in \fICrypt::RSA\fR\|(3) manpage.
.SH "BIBLIOGRAPHY"
.IX Header "BIBLIOGRAPHY"
See \s-1BIBLIOGRAPHY\s0 in \fICrypt::RSA\fR\|(3) manpage.
.SH "AUTHOR"
.IX Header "AUTHOR"
Vipul Ved Prakash, <mail@vipul.net>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fICrypt::RSA\fR\|(3), \fICrypt::RSA::Primitives\fR\|(3), \fICrypt::RSA::Keys\fR\|(3),
\&\fICrypt::RSA::SSA::PSS\fR\|(3)