| '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); |
| }; |