50 lines
1.2 KiB
JavaScript
50 lines
1.2 KiB
JavaScript
var inherits = require('inherits');
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var Buffer = require('buffer').Buffer;
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var DERDecoder = require('./der');
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function PEMDecoder(entity) {
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DERDecoder.call(this, entity);
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this.enc = 'pem';
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};
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inherits(PEMDecoder, DERDecoder);
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module.exports = PEMDecoder;
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PEMDecoder.prototype.decode = function decode(data, options) {
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var lines = data.toString().split(/[\r\n]+/g);
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var label = options.label.toUpperCase();
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var re = /^-----(BEGIN|END) ([^-]+)-----$/;
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var start = -1;
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var end = -1;
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for (var i = 0; i < lines.length; i++) {
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var match = lines[i].match(re);
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if (match === null)
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continue;
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if (match[2] !== label)
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continue;
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if (start === -1) {
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if (match[1] !== 'BEGIN')
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break;
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start = i;
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} else {
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if (match[1] !== 'END')
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break;
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end = i;
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break;
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}
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}
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if (start === -1 || end === -1)
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throw new Error('PEM section not found for: ' + label);
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var base64 = lines.slice(start + 1, end).join('');
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// Remove excessive symbols
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base64.replace(/[^a-z0-9\+\/=]+/gi, '');
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var input = new Buffer(base64, 'base64');
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return DERDecoder.prototype.decode.call(this, input, options);
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};
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