Unable to decrypt string encrypted using openssl -aes256 in swift - ios

Question

I want to encrypt keys outside application and pass to application. In the app while using those key again have to decrypt string using key which were used while encryption.
Which key to be used while decrypting in Swift? "FUUU" or key generated by openssl command
On mac I am generating encrypted string using openssl -aes256, but while decrypted in swift it always returns nil.
If I set key generated by openssl then it gives error "Error: Failed to set a key." and "Error: Failed to set an initial vector."
echo -n "TEST1" | openssl enc -aes256 -k FUUU -nosalt -a -p
Console Output
key=59C12FFF74992ED40F4DF80A56AB55AE7C513B17CB4B8CF8342E9444C7F7AF3B
iv =0BEE68AD25123B7076B91A5AFB549E33
bYbkQJcDFZt3y3UQEMbEeg==
Decrypt in Swift
let encryptedMessage = "bYbkQJcDFZt3y3UQEMbEeg==".data(using: .utf8)!
let key256 = "59C12FFF74992ED40F4DF80A56AB55AE7C513B17CB4B8CF8342E9444C7F7AF3B" // 32 bytes for AES256
let iv = "0BEE68AD25123B7076B91A5AFB549E33" // 16 bytes for AES128
let aes256 = AES(key: key256, iv: iv)
let decryptedMessage256 = aes256?.decrypt(data: encryptedMessage)
print("Decrypted: \(String(bytes: decryptedMessage256, encoding: .utf8))")
AES
import CommonCrypto
struct AES {
// MARK: - Value
// MARK: Private
private let key: Data
private let iv: Data
// MARK: - Initialzier
init?(key: String, iv: String) {
guard key.count == kCCKeySizeAES128 || key.count == kCCKeySizeAES256, let keyData = key.data(using: .utf8) else {
debugPrint("Error: Failed to set a key.")
return nil
}
guard iv.count == kCCBlockSizeAES128, let ivData = iv.data(using: .utf8) else {
debugPrint("Error: Failed to set an initial vector.")
return nil
}
self.key = keyData
self.iv = ivData
}
// MARK: - Function
// MARK: Public
func encrypt(string: String) -> Data? {
return crypt(data: string.data(using: .utf8), option: CCOperation(kCCEncrypt))
}
func decrypt(data: Data?) -> String? {
guard let decryptedData = crypt(data: data, option: CCOperation(kCCDecrypt)) else { return nil }
return String(bytes: decryptedData, encoding: .utf8)
}
func crypt(data: Data?, option: CCOperation) -> Data? {
guard let data = data else { return nil }
let cryptLength = [UInt8](repeating: 0, count: data.count + kCCBlockSizeAES128).count
var cryptData = Data(count: cryptLength)
let keyLength = [UInt8](repeating: 0, count: kCCBlockSizeAES128).count
let options = CCOptions(kCCOptionPKCS7Padding)
var bytesLength = Int(0)
let status = cryptData.withUnsafeMutableBytes { cryptBytes in
data.withUnsafeBytes { dataBytes in
iv.withUnsafeBytes { ivBytes in
key.withUnsafeBytes { keyBytes in
CCCrypt(option, CCAlgorithm(kCCAlgorithmAES), options, keyBytes, keyLength, ivBytes, dataBytes, data.count, cryptBytes, cryptLength, &bytesLength)
}
}
}
}
guard UInt32(status) == UInt32(kCCSuccess) else {
debugPrint("Error: Failed to crypt data. Status \(status)")
return nil
}
cryptData.removeSubrange(bytesLength..<cryptData.count)
return cryptData
}
}

Answer 1

I am afraid that desktop cypher frameworks does not match with mobile cypher frameworks, it's a common problem on iOS, you would have create your own cypher to be able to match it.
But in the other hand you can use CryptoSwift, its very reliable, personally I use it, it does match with server cyphers, so I think it can solve your problem.