Decrypt on iOS (CBC, Pkcs7, EVP_BytesToKey)

AESHelper.swift

static func decrypt(_ base64String: String, passwordUtf8: String) throws -> String {
        let encrypted = Data(base64Encoded: base64String)!
        let salt = [UInt8](encrypted[8 ..< 16])
        let evp = try EVP_KDF_Util.generate_evp_kdf_aes256cbc_key_iv(pass: passwordUtf8, saltData: salt) // key + iv
        let aes = try AES(key: Array<UInt8>.init(hex: evp.0),
                          blockMode: CBC(iv: Array<UInt8>.init(hex: evp.1)),
                          padding: .pkcs7)
        let data = [UInt8](encrypted[16 ..< encrypted.count])
        let decrypted = try aes.decrypt(data)
        
        guard let decryptedStr = String(bytes: decrypted, encoding: .utf8) else {
            throw AES.Error.invalidData
        }
        return decryptedStr
    }