mirror of
https://github.com/guanzhi/GmSSL.git
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112 lines
3.7 KiB
JavaScript
112 lines
3.7 KiB
JavaScript
/*
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* Copyright (c) 2014 - 2020 The GmSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the GmSSL Project.
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* (http://gmssl.org/)"
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*
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* 4. The name "GmSSL Project" must not be used to endorse or promote
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* products derived from this software without prior written
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* permission. For written permission, please contact
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* guanzhi1980@gmail.com.
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*
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* 5. Products derived from this software may not be called "GmSSL"
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* nor may "GmSSL" appear in their names without prior written
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* permission of the GmSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the GmSSL Project
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* (http://gmssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE GmSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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const BASE64_MAP = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
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function base64_encode(bytes) {
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var i = 0; j = 0;
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var append = bytes.length % 3 > 0 ? 3 - bytes.length % 3 : 0;
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for (i = 0; i < append; i++) {
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bytes[bytes.length] = 0;
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}
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var b64 = "";
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for (i = 0; j < bytes.length; j += 3) {
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if (j > 0 && j % 57 == 0) {
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b64 += '\n';
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}
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b64 += BASE64_MAP[bytes[j] >> 2]
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+ BASE64_MAP[(bytes[j] & 3) << 4 | bytes[j+1] >> 4]
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+ BASE64_MAP[(bytes[j+1] & 15) << 2 | bytes[j+2] >> 6]
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+ BASE64_MAP[bytes[j+2] & 63];
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}
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for (i = 0; i < append; i++) {
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b64 += '=';
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}
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return b64;
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}
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function base64_decode(input) {
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var i = 0, j = 0;
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input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
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var append = input.length % 4;
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if (append > 2) {
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return null;
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}
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for (i = 0; i < append; i++) {
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if (input.charAt(input.length - i - 1) != '=') {
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return null;
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}
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}
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var output = new Array((input.length - append) * 3 / 4);
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var enc1, enc2, enc3, enc4;
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for (i = 0, j = 0; j < output.length;) {
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enc1 = BASE64_MAP.indexOf(input.charAt(i++));
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enc2 = BASE64_MAP.indexOf(input.charAt(i++));
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enc3 = BASE64_MAP.indexOf(input.charAt(i++));
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enc4 = BASE64_MAP.indexOf(input.charAt(i++));
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output[j++] = (enc1 << 2) | (enc2 >> 4);
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output[j++] = ((enc2 & 15) << 4) | (enc3 >> 2);
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output[j++] = ((enc3 & 3) << 6) | enc4;
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}
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for (i = 0; i < append; i++) {
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if (output.pop() != 0) {
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return null;
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}
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}
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return output;
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}
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function base64_test() {
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var bin = [1, 2, 3, 4, 5];
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var b64 = base64_encode(bin);
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var buf = base64_decode(b64);
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console.log(b64);
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console.log(buf);
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}
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