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41 lines
1.6 KiB
41 lines
1.6 KiB
/*! @name pkcs7 @version 1.0.4 @license Apache-2.0 */ |
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/* |
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* pkcs7.pad |
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* https://github.com/brightcove/pkcs7 |
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* |
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* Copyright (c) 2014 Brightcove |
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* Licensed under the apache2 license. |
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*/ |
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var PADDING; |
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/** |
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* Returns a new Uint8Array that is padded with PKCS#7 padding. |
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* |
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* @param plaintext {Uint8Array} the input bytes before encryption |
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* @return {Uint8Array} the padded bytes |
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* @see http://tools.ietf.org/html/rfc5652 |
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*/ |
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function pad(plaintext) { |
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var padding = PADDING[plaintext.byteLength % 16 || 0]; |
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var result = new Uint8Array(plaintext.byteLength + padding.length); |
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result.set(plaintext); |
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result.set(padding, plaintext.byteLength); |
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return result; |
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} // pre-define the padding values |
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PADDING = [[16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16], [15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15], [14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14], [13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13], [12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12], [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11], [10, 10, 10, 10, 10, 10, 10, 10, 10, 10], [9, 9, 9, 9, 9, 9, 9, 9, 9], [8, 8, 8, 8, 8, 8, 8, 8], [7, 7, 7, 7, 7, 7, 7], [6, 6, 6, 6, 6, 6], [5, 5, 5, 5, 5], [4, 4, 4, 4], [3, 3, 3], [2, 2], [1]]; |
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/** |
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* Returns the subarray of a Uint8Array without PKCS#7 padding. |
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* |
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* @param padded {Uint8Array} unencrypted bytes that have been padded |
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* @return {Uint8Array} the unpadded bytes |
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* @see http://tools.ietf.org/html/rfc5652 |
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*/ |
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function unpad(padded) { |
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return padded.subarray(0, padded.byteLength - padded[padded.byteLength - 1]); |
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} |
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var version = "1.0.4"; |
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export { version as VERSION, pad, unpad };
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