144 lines
11 KiB
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144 lines
11 KiB
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<title>JSDoc: Source: ciphers/openpgp.crypto.sym.js</title>
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<h1 class="page-title">Source: ciphers/openpgp.crypto.sym.js</h1>
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<pre class="prettyprint source"><code>// GPG4Browsers - An OpenPGP implementation in javascript
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// Copyright (C) 2011 Recurity Labs GmbH
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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// The GPG4Browsers symmetric crypto interface
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/**
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* Symmetrically encrypts data using prefixedrandom, a key with length
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* depending on the algorithm in openpgp_cfb mode with or without resync
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* (MDC style)
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* @param {String} prefixrandom Secure random bytes as string in
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* length equal to the block size of the algorithm used (use
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* openpgp_crypto_getPrefixRandom(algo) to retrieve that string
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* @param {Integer} algo Algorithm to use (see RFC4880 9.2)
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* @param {String} key Key as string. length is depending on the algorithm used
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* @param {String} data Data to encrypt
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* @param {Boolean} openpgp_cfb
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* @return {String} Encrypted data
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*/
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function openpgp_crypto_symmetricEncrypt(prefixrandom, algo, key, data, openpgp_cfb) {
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switch(algo) {
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case 0: // Plaintext or unencrypted data
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return data; // blockcipherencryptfn, plaintext, block_size, key
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case 2: // TripleDES (DES-EDE, [SCHNEIER] [HAC] - 168 bit key derived from 192)
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return openpgp_cfb_encrypt(prefixrandom, desede, data,8,key, openpgp_cfb).substring(0, data.length + 10);
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case 3: // CAST5 (128 bit key, as per [RFC2144])
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return openpgp_cfb_encrypt(prefixrandom, cast5_encrypt, data,8,key, openpgp_cfb).substring(0, data.length + 10);
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case 4: // Blowfish (128 bit key, 16 rounds) [BLOWFISH]
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return openpgp_cfb_encrypt(prefixrandom, BFencrypt, data,8,key, openpgp_cfb).substring(0, data.length + 10);
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case 7: // AES with 128-bit key [AES]
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case 8: // AES with 192-bit key
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case 9: // AES with 256-bit key
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return openpgp_cfb_encrypt(prefixrandom, AESencrypt, data, 16, keyExpansion(key), openpgp_cfb).substring(0, data.length + 18);
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case 10: // Twofish with 256-bit key [TWOFISH]
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return openpgp_cfb_encrypt(prefixrandom, TFencrypt, data,16, key, openpgp_cfb).substring(0, data.length + 18);
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case 1: // IDEA [IDEA]
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util.print_error("IDEA Algorithm not implemented");
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return null;
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default:
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return null;
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}
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}
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/**
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* Symmetrically decrypts data using a key with length depending on the
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* algorithm in openpgp_cfb mode with or without resync (MDC style)
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* @param {Integer} algo Algorithm to use (see RFC4880 9.2)
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* @param {String} key Key as string. length is depending on the algorithm used
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* @param {String} data Data to be decrypted
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* @param {Boolean} openpgp_cfb If true use the resync (for encrypteddata);
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* otherwise use without the resync (for MDC encrypted data)
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* @return {String} Plaintext data
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*/
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function openpgp_crypto_symmetricDecrypt(algo, key, data, openpgp_cfb) {
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util.print_debug_hexstr_dump("openpgp_crypto_symmetricDecrypt:\nalgo:"+algo+"\nencrypteddata:",data);
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var n = 0;
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if (!openpgp_cfb)
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n = 2;
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switch(algo) {
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case 0: // Plaintext or unencrypted data
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return data;
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case 2: // TripleDES (DES-EDE, [SCHNEIER] [HAC] - 168 bit key derived from 192)
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return openpgp_cfb_decrypt(desede, 8, key, data, openpgp_cfb).substring(n, (data.length+n)-10);
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case 3: // CAST5 (128 bit key, as per [RFC2144])
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return openpgp_cfb_decrypt(cast5_encrypt, 8, key, data, openpgp_cfb).substring(n, (data.length+n)-10);
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case 4: // Blowfish (128 bit key, 16 rounds) [BLOWFISH]
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return openpgp_cfb_decrypt(BFencrypt, 8, key, data, openpgp_cfb).substring(n, (data.length+n)-10);
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case 7: // AES with 128-bit key [AES]
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case 8: // AES with 192-bit key
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case 9: // AES with 256-bit key
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return openpgp_cfb_decrypt(AESencrypt, 16, keyExpansion(key), data, openpgp_cfb).substring(n, (data.length+n)-18);
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case 10: // Twofish with 256-bit key [TWOFISH]
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var result = openpgp_cfb_decrypt(TFencrypt, 16, key, data, openpgp_cfb).substring(n, (data.length+n)-18);
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return result;
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case 1: // IDEA [IDEA]
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util.print_error(""+ (algo == 1 ? "IDEA Algorithm not implemented" : "Twofish Algorithm not implemented"));
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return null;
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default:
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}
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return null;
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}
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</code></pre>
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