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129 | .\" ======================================================================== | |
130 | .\" | |
131 | .IX Title "Tea 3" | |
132 | .TH Tea 3 "2002-09-16" "perl v5.8.0" "User Contributed Perl Documentation" | |
133 | .SH "NAME" | |
134 | Tea.pm \- The Tiny Encryption Algorithm in Perl and JavaScript | |
135 | .SH "SYNOPSIS" | |
136 | .IX Header "SYNOPSIS" | |
137 | Usage: | |
138 | .PP | |
139 | .Vb 7 | |
140 | \& use Crypt::Tea; | |
141 | \& $key = 'PUFgob$*LKDF D)(F IDD&P?/'; | |
142 | \& $ascii_ciphertext = &encrypt ($plaintext, $key); | |
143 | \& ... | |
144 | \& $plaintext_again = &decrypt ($ascii_ciphertext, $key); | |
145 | \& ... | |
146 | \& $signature = &asciidigest ($text); | |
147 | .Ve | |
148 | .PP | |
149 | In \s-1CGI\s0 scripts: | |
150 | .PP | |
151 | .Vb 3 | |
152 | \& use Crypt::Tea; | |
153 | \& print &tea_in_javascript; # now the browser can encrypt | |
154 | \& # and decrypt ! see CGI::Htauth.pm for examples ... | |
155 | .Ve | |
156 | .SH "DESCRIPTION" | |
157 | .IX Header "DESCRIPTION" | |
158 | This module implements \s-1TEA\s0, the Tiny Encryption Algorithm, | |
159 | and some Modes of Use, in Perl and JavaScript. | |
160 | .PP | |
161 | The \f(CW$key\fR is a sufficiently longish string; at least 17 random 8\-bit | |
162 | bytes for single encryption. | |
163 | .PP | |
164 | As of version 1.34, various Htauth-specific hook routines | |
165 | have now been moved out into the \fICGI::Htauth.pm\fR module. | |
166 | .PP | |
167 | Version 1.43, | |
168 | #COMMENT# | |
169 | .PP | |
170 | (c) Peter J Billam 1998 | |
171 | .SH "SUBROUTINES" | |
172 | .IX Header "SUBROUTINES" | |
173 | .ie n .IP "\fIencrypt\fR( $plaintext\fR, \f(CW$key );" 3 | |
174 | .el .IP "\fIencrypt\fR( \f(CW$plaintext\fR, \f(CW$key\fR );" 3 | |
175 | .IX Item "encrypt( $plaintext, $key );" | |
176 | Encrypts with \s-1CBC\s0 (Cipher Block Chaining) | |
177 | .ie n .IP "\fIdecrypt\fR( $ciphertext\fR, \f(CW$key );" 3 | |
178 | .el .IP "\fIdecrypt\fR( \f(CW$ciphertext\fR, \f(CW$key\fR );" 3 | |
179 | .IX Item "decrypt( $ciphertext, $key );" | |
180 | Decrypts with \s-1CBC\s0 (Cipher Block Chaining) | |
181 | .ie n .IP "\fIbinary2ascii\fR( $a_binary_string );" 3 | |
182 | .el .IP "\fIbinary2ascii\fR( \f(CW$a_binary_string\fR );" 3 | |
183 | .IX Item "binary2ascii( $a_binary_string );" | |
184 | Provide an ascii text encoding of the binary argument. | |
185 | If Tea.pm is not being invoked from a \s-1GCI\s0 script, | |
186 | the ascii is split into lines of 72 characters. | |
187 | .ie n .IP "\fIascii2binary\fR( $an_ascii_string );" 3 | |
188 | .el .IP "\fIascii2binary\fR( \f(CW$an_ascii_string\fR );" 3 | |
189 | .IX Item "ascii2binary( $an_ascii_string );" | |
190 | .PD 0 | |
191 | .ie n .IP "\fIasciidigest\fR( $a_string );" 3 | |
192 | .el .IP "\fIasciidigest\fR( \f(CW$a_string\fR );" 3 | |
193 | .IX Item "asciidigest( $a_string );" | |
194 | .PD | |
195 | Returns an asciified binary signature of the argument. | |
196 | .IP "\fItea_in_javascript\fR();" 3 | |
197 | .IX Item "tea_in_javascript();" | |
198 | Returns a compatible implementation of \s-1TEA\s0 in JavaScript, | |
199 | for use in \s-1CGI\s0 scripts to communicate with browsers. | |
200 | .SH "AUTHOR" | |
201 | .IX Header "AUTHOR" | |
202 | Peter J Billam <peter@pjb.com.au>, | |
203 | with thanks also to Neil Watkiss for MakeMaker packaging. | |
204 | .SH "CREDITS" | |
205 | .IX Header "CREDITS" | |
206 | Based on \s-1TEA\s0, as described in | |
207 | http://www.cl.cam.ac.uk/ftp/papers/djw\-rmn/djw\-rmn\-tea.html , | |
208 | and on some help from \fIApplied Cryptography\fR by Bruce Schneier | |
209 | as regards the modes of use. | |
210 | .SH "SEE ALSO" | |
211 | .IX Header "SEE ALSO" | |
212 | http://www.pjb.com.au/, CGI::Htauth.pm, \fIperl\fR\|(1). |