Crypt::RSA::SS::PSS(3pm)

1Crypt::RSA::SS::PSS(3)User Contributed Perl DocumentationCrypt::RSA::SS::PSS(3)
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NAME

6       Crypt::RSA::SS::PSS - Probabilistic Signature Scheme based on RSA.
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SYNOPSIS

9           my $pss = new Crypt::RSA::SS::PSS;
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11           my $signature = $pss->sign (
12                               Message => $message,
13                               Key     => $private,
14                           ) || die $pss->errstr;
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16           my $verify    = $pss->verify (
17                               Message   => $message,
18                               Key       => $key,
19                               Signature => $signature,
20                           ) || die $pss->errstr;
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DESCRIPTION

23       PSS (Probabilistic Signature Scheme) is a provably secure method of
24       creating digital signatures with RSA. "Provable" means that the
25       difficulty of forging signatures can be directly related to inverting
26       the RSA function. "Probabilistic" alludes to the randomly generated
27       salt value included in the signature to enhance security. For more
28       details on PSS, see [4] & [13].
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METHODS

31   new()
32       Constructor.
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34   version()
35       Returns the version number of the module.
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37   sign()
38       Computes a PSS signature on a message with the private key of the
39       signer.  In scalar context, sign() returns the computed signature. In
40       array context, it returns the signature and the random salt. The
41       signature can verified with verify() or verify_with_salt(). sign()
42       takes a hash argument with the following mandatory keys:
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44       Message
45           Message to be signed, a string of arbitrary length.
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47       Key Private key of the signer, a Crypt::RSA::Key::Private object.
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49   verify()
50       Verifies a signature generated with sign(). The salt is recovered from
51       the signature and need not be passed. Returns a true value on success
52       and false on failure. $self->errstr is set to "Invalid signature." or
53       appropriate error on failure. verify() takes a hash argument with the
54       following mandatory keys:
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56       Key Public key of the signer, a Crypt::RSA::Key::Public object.
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58       Message
59           The original signed message, a string of arbitrary length.
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61       Signature
62           Signature computed with sign(), a string.
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64       Version
65           Version of the module that was used for creating the Signature.
66           This is an optional argument. When present, verify() will ensure
67           before proceeding that the installed version of the module can
68           successfully verify the Signature.
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70   verify_with_salt()
71       Verifies a signature given the salt. Takes the same arguments as
72       verify() in addition to Salt, which is a 20-byte string returned by
73       sign() in array context.
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ERROR HANDLING

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

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

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