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