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// adapted from https://github.com/apatil/pemstrip
var findProc = /Proc-Type: 4,ENCRYPTED[\n\r]+DEK-Info: AES-((?:128)|(?:192)|(?:256))-CBC,([0-9A-H]+)[\n\r]+([0-9A-z\n\r+/=]+)[\n\r]+/m
var startRegex = /^-----BEGIN ((?:.*? KEY)|CERTIFICATE)-----/m
var fullRegex = /^-----BEGIN ((?:.*? KEY)|CERTIFICATE)-----([0-9A-z\n\r+/=]+)-----END \1-----$/m
var evp = require('evp_bytestokey')
var ciphers = require('browserify-aes')
var Buffer = require('safe-buffer').Buffer
module.exports = function (okey, password) {
  var key = okey.toString()
  var match = key.match(findProc)
  var decrypted
  if (!match) {
    var match2 = key.match(fullRegex)
    decrypted = Buffer.from(match2[2].replace(/[\r\n]/g, ''), 'base64')
  } else {
    var suite = 'aes' + match[1]
    var iv = Buffer.from(match[2], 'hex')
    var cipherText = Buffer.from(match[3].replace(/[\r\n]/g, ''), 'base64')
    var cipherKey = evp(password, iv.slice(0, 8), parseInt(match[1], 10)).key
    var out = []
    var cipher = ciphers.createDecipheriv(suite, cipherKey, iv)
    out.push(cipher.update(cipherText))
    out.push(cipher.final())
    decrypted = Buffer.concat(out)
  }
  var tag = key.match(startRegex)[1]
  return {
    tag: tag,
    data: decrypted
  }
}