Crypt::RSA::ES::OAEP(3pm)

1Crypt::RSA::ES::OAEP(3)User Contributed Perl DocumentatioCnrypt::RSA::ES::OAEP(3)
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NAME

6       Crypt::RSA::ES::OAEP - Plaintext-aware encryption with RSA.
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SYNOPSIS

9           my $oaep = new Crypt::RSA::ES::OAEP;
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11           my $ct = $oaep->encrypt( Key => $key, Message => $message ) ⎪⎪
12                       die $oaep->errstr;
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14           my $pt = $oaep->decrypt( Key => $key, Cyphertext => $ct )   ⎪⎪
15                       die $oaep->errstr;
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DESCRIPTION

18       This module implements Optimal Asymmetric Encryption, a plaintext-aware
19       encryption scheme based on RSA. The notion of plaintext-aware implies
20       it's computationally infeasible to obtain full or partial information
21       about a message from a cyphertext, and computationally infeasible to
22       generate a valid cyphertext without knowing the corresponding message.
23       Plaintext-aware schemes, such as OAEP, are semantically secure, non-
24       malleable and secure against chosen-ciphertext attack. For more infor‐
25       mation on OAEP and plaintext-aware encryption, see [3], [9] & [13].
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METHODS

28       new()
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30       Constructor.
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32       version()
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34       Returns the version number of the module.
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36       encrypt()
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38       Encrypts a string with a public key and returns the encrypted string on
39       success. encrypt() takes a hash argument with the following mandatory
40       keys:
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42       Message
43           A string to be encrypted. The length of this string should not
44           exceed k-42 octets, where k is the octet length of the RSA modulus.
45           If Message is longer than k-42, the method will fail and set
46           $self->errstr to "Message too long." This means the key must be at
47           least _336_ bits long if you are to use OAEP.
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49       Key Public key of the recipient, a Crypt::RSA::Key::Public object.
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51       decrypt()
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53       Decrypts cyphertext with a private key and returns plaintext on suc‐
54       cess. $self->errstr is set to "Decryption Error." or appropriate error
55       on failure. decrypt() takes a hash argument with the following manda‐
56       tory keys:
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58       Cyphertext
59           A string encrypted with encrypt(). The length of the cyphertext
60           must be k octets, where k is the length of the RSA modulus.
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62       Key Private key of the receiver, a Crypt::RSA::Key::Private object.
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64       Version
65           Version of the module that was used for creating the Cyphertext.
66           This is an optional argument. When present, decrypt() will ensure
67           before proceeding that the installed version of the module can suc‐
68           cessfully decrypt the Cyphertext.
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ERROR HANDLING

71       See ERROR HANDLING in Crypt::RSA(3) manpage.
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BIBLIOGRAPHY

74       See BIBLIOGRAPHY in Crypt::RSA(3) manpage.
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AUTHOR

77       Vipul Ved Prakash, <mail@vipul.net>
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