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72 lines
1.5 KiB
72 lines
1.5 KiB
11 months ago
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/*!
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* Crypto-JS v1.1.0
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* http://code.google.com/p/crypto-js/
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* Copyright (c) 2009, Jeff Mott. All rights reserved.
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* http://code.google.com/p/crypto-js/wiki/License
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*/
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Crypto.mode.CBC = {
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encrypt: function (cipher, m, iv) {
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var blockSizeInBytes = cipher._blocksize * 4;
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// Pad
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m.push(0x80);
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// Encrypt each block
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for (var offset = 0; offset < m.length; offset += blockSizeInBytes) {
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if (offset == 0) {
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// XOR first block using IV
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for (var i = 0; i < blockSizeInBytes; i++)
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m[i] ^= iv[i];
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}
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else {
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// XOR this block using previous crypted block
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for (var i = 0; i < blockSizeInBytes; i++)
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m[offset + i] ^= m[offset + i - blockSizeInBytes];
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}
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// Encrypt block
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cipher._encryptblock(m, offset);
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}
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},
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decrypt: function (cipher, c, iv) {
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var blockSizeInBytes = cipher._blocksize * 4;
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// Decrypt each block
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for (var offset = 0; offset < c.length; offset += blockSizeInBytes) {
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// Save this crypted block
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var thisCryptedBlock = c.slice(offset, offset + blockSizeInBytes);
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// Decrypt block
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cipher._decryptblock(c, offset);
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if (offset == 0) {
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// XOR first block using IV
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for (var i = 0; i < blockSizeInBytes; i++)
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c[i] ^= iv[i];
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}
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else {
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// XOR decrypted block using previous crypted block
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for (var i = 0; i < blockSizeInBytes; i++)
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c[offset + i] ^= prevCryptedBlock[i];
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}
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// This crypted block is the new previous crypted block
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var prevCryptedBlock = thisCryptedBlock;
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}
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// Strip padding
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while (c.pop() != 0x80) ;
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}
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};
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