45 lines
1.1 KiB
JavaScript
45 lines
1.1 KiB
JavaScript
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const { inherits } = require('util')
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const 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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PEMDecoder.prototype.decode = function decode (data, options) {
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const lines = data.toString().split(/[\r\n]+/g)
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const label = options.label.toUpperCase()
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const re = /^-----(BEGIN|END) ([^-]+)-----$/
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let start = -1
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let end = -1
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for (let i = 0; i < lines.length; i++) {
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const match = lines[i].match(re)
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if (match === null) { continue }
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if (match[2] !== label) { continue }
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if (start === -1) {
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if (match[1] !== 'BEGIN') { break }
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start = i
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} else {
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if (match[1] !== 'END') { 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) { throw new Error(`PEM section not found for: ${label}`) }
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const 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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const input = Buffer.from(base64, 'base64')
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return DERDecoder.prototype.decode.call(this, input, options)
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}
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module.exports = PEMDecoder
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