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