75 lines
1.3 KiB
Perl
75 lines
1.3 KiB
Perl
package Crypt::Stream::ChaCha;
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use strict;
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use warnings;
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our $VERSION = '0.058_002';
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use CryptX;
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1;
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=pod
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=head1 NAME
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Crypt::Stream::ChaCha - Stream cipher ChaCha
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=head1 SYNOPSIS
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use Crypt::Stream::ChaCha;
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# encrypt
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$key = "1234567890123456";
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$iv = "123456789012";
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$stream = Crypt::Stream::ChaCha->new($key, $iv);
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$ct = $stream->crypt("plain message");
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# decrypt
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$key = "1234567890123456";
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$iv = "123456789012";
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$stream = Crypt::Stream::ChaCha->new($key, $iv);
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$pt = $stream->crypt($ct);
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=head1 DESCRIPTION
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Provides an interface to the ChaCha stream cipher.
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=head1 METHODS
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=head2 new
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$stream = Crypt::Stream::ChaCha->new($key, $iv);
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#or
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$stream = Crypt::Stream::ChaCha->new($key, $iv, $counter, $rounds);
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# $key .. 32 or 16 bytes
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# $iv .. 8 or 12 bytes
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# $counter .. initial counter value (DEFAULT: 0)
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# $rounds .. rounds (DEFAULT: 20)
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=head2 crypt
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$ciphertext = $stream->crypt($plaintext);
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#or
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$plaintext = $stream->crypt($ciphertext);
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=head2 keystream
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$random_key = $stream->keystream($length);
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=head2 clone
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$stream->clone();
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=head1 SEE ALSO
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=over
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=item * L<Crypt::Stream::RC4>, L<Crypt::Stream::Sober128>, L<Crypt::Stream::Salsa20>, L<Crypt::Stream::Sosemanuk>
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=item * L<https://tools.ietf.org/html/rfc7539>
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=back
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=cut
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