在iOS中实现对AES/CBC/PKCS5加密解密

import CommonCrypto

func encrypt(data: Data, key: Data, iv: Data) -> Data? {
    var encryptedData = Data(count: data.count + kCCBlockSizeAES128)
    var encryptedDataLength: Int = 0
    
    let status = encryptedData.withUnsafeMutableBytes { encryptedBytes in
        data.withUnsafeBytes { dataBytes in
            key.withUnsafeBytes { keyBytes in
                iv.withUnsafeBytes { ivBytes in
                    CCCrypt(CCOperation(kCCEncrypt),
                            CCAlgorithm(kCCAlgorithmAES),
                            CCOptions(kCCOptionPKCS7Padding),
                            keyBytes.baseAddress, key.count,
                            ivBytes.baseAddress,
                            dataBytes.baseAddress, data.count,
                            encryptedBytes.baseAddress, encryptedData.count,
                            &encryptedDataLength)
                }
            }
        }
    }
    
    if status == kCCSuccess {
        encryptedData.count = encryptedDataLength
        return encryptedData
    }
    
    return nil
}

func decrypt(data: Data, key: Data, iv: Data) -> Data? {
    var decryptedData = Data(count: data.count + kCCBlockSizeAES128)
    var decryptedDataLength: Int = 0
    
    let status = decryptedData.withUnsafeMutableBytes { decryptedBytes in
        data.withUnsafeBytes { dataBytes in
            key.withUnsafeBytes { keyBytes in
                iv.withUnsafeBytes { ivBytes in
                    CCCrypt(CCOperation(kCCDecrypt),
                            CCAlgorithm(kCCAlgorithmAES),
                            CCOptions(kCCOptionPKCS7Padding),
                            keyBytes.baseAddress, key.count,
                            ivBytes.baseAddress,
                            dataBytes.baseAddress, data.count,
                            decryptedBytes.baseAddress, decryptedData.count,
                            &decryptedDataLength)
                }
            }
        }
    }
    
    if status == kCCSuccess {
        decryptedData.count = decryptedDataLength
        return decryptedData
    }
    
    return nil
}