java - Kotlin 使用内置 ECB Java 实现实现 AES-CBC

问题描述

我正在尝试按照此处指定的 CBC 模式的步骤，使用内置的 ECB Java 实现来实现 AES-CBC 密码。请注意，我并不关心我的实现的实际安全性（例如，没有填充，或使用密钥作为 IV）。

问题是，与使用PKCS5Padding.

Key:              mvLBiZsiTbGwrfJB
Input:            abcdabcdabcdabcd

My result:        e9qdKeY1m4OAIsPerfnUi5F35z814ywucLJKKi4rTP8=
Result from site: e9qdKeY1m4OAIsPerfnUi9jNsRJtdELZliFtebuJrrc=


Key:              mvLBiZsiTbGwrfJB
Input:            abcdabcdabcdabcdabcdabcdabcdabcd

My result:        e9qdKeY1m4OAIsPerfnUi5F35z814ywucLJKKi4rTP8=uf5VPLwumm+66ESiQMlKXJF35z814ywucLJKKi4rTP8=
Result from site: e9qdKeY1m4OAIsPerfnUi7I+cPTpraAgZIQvr8OLf7Iu4eKRG1MIcq5yQGsRt3PS

对于NoPadding选项：

Key:              mvLBiZsiTbGwrfJB
Input:            abcdabcdabcdabcd

My result:        e9qdKeY1m4OAIsPerfnUiw==


Key:              mvLBiZsiTbGwrfJB
Input:            abcdabcdabcdabcdabcdabcdabcdabcd

My result:        e9qdKeY1m4OAIsPerfnUiw==uf5VPLwumm+66ESiQMlKXA==

此外，解密根本不起作用，因为PKCS5Padding我有例外：

Exception in thread "main" javax.crypto.IllegalBlockSizeException: Input length must be multiple of 16 when decrypting with padded cipher
    at java.base/com.sun.crypto.provider.CipherCore.prepareInputBuffer(CipherCore.java:1005)
    at java.base/com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:848)
    at java.base/com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:446)
    at java.base/javax.crypto.Cipher.doFinal(Cipher.java:2202)
    at AesEcb.decrypt(AesEcb.kt:27)
    at AesEcb.decryptToByteArray(AesEcb.kt:36)
    at AesCbcOwn.decrypt(AesCbcOwn.kt:32)

和NoPadding：

Exception in thread "main" javax.crypto.IllegalBlockSizeException: Input length not multiple of 16 bytes
    at java.base/com.sun.crypto.provider.CipherCore.finalNoPadding(CipherCore.java:1109)
    at java.base/com.sun.crypto.provider.CipherCore.fillOutputBuffer(CipherCore.java:1053)
    at java.base/com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:853)
    at java.base/com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:446)
    at java.base/javax.crypto.Cipher.doFinal(Cipher.java:2202)
    at AesEcb.decrypt(AesEcb.kt:27)
    at AesEcb.decryptToByteArray(AesEcb.kt:36)
    at AesCbcOwn.decrypt(AesCbcOwn.kt:32)

我认为这些问题与填充选项有关，但无论选择何种选项，我仍然无法完成这项工作。

用于 CBC 实现的 AES-ECB 实现：

object AesEcb : Aes {
    override val cipher: Cipher = Cipher.getInstance("AES/ECB/PKCS5Padding")

    override fun encrypt(input: String, key: String): String {
        val encrypted: ByteArray = try {
            val secretKey = SecretKeySpec(key.toByteArray(), "AES")

            cipher.init(Cipher.ENCRYPT_MODE, secretKey)
            cipher.doFinal(input.toByteArray())
        } catch (e: InvalidKeyException) {
            throw e
        }

        return Base64.getEncoder().run { encodeToString(encrypted) }
    }

    override fun decrypt(input: String, key: String): String {
        val output: ByteArray = try {
            val secretKey = SecretKeySpec(key.toByteArray(), "AES")

            cipher.init(Cipher.DECRYPT_MODE, secretKey)
            Base64.getDecoder().run { cipher.doFinal(decode(input)) }
        } catch (e: InvalidKeyException) {
            throw e
        }

        return String(output)
    }

    fun encryptToByteArray(bytes: ByteArray, key: String) = encrypt(String(bytes), key).toByteArray()
    fun decryptToByteArray(bytes: ByteArray, key: String) = decrypt(String(bytes), key).toByteArray()
}

我的CBC实施：

object AesCbcOwn {
    fun encrypt(plainText: String, key: String): String {
        val iv = key.take(16).toByteArray()
        val blocks = plainText.chunked(16).map { it.toByteArray() }

        val encryptedBytes = with(blocks.iterator()) {
            generateSequence(
                AesEcb.encryptToByteArray(iv xor next(), key)
            ) {
                try {
                    AesEcb.encryptToByteArray(it xor next(), key)
                } catch (e: NoSuchElementException) {
                    null
                }
            }
        }

        return encryptedBytes.joinToString("") { String(it) }
    }

    fun decrypt(encryptedText: String, key: String): String {
        val iv = key.take(16).toByteArray()
        val encryptedBlocks = encryptedText.chunked(16).map { it.toByteArray() }

        val decryptedBytes = with(encryptedBlocks.iterator()) {
            generateSequence(
                AesEcb.decryptToByteArray(next(), key) xor iv
            ) {
                try {
                    AesEcb.decryptToByteArray(next(), key) xor it
                } catch (e: NoSuchElementException) {
                    null
                }
            }
        }

        return decryptedBytes.joinToString("") { String(it) }
    }

    private infix fun ByteArray.xor(other: ByteArray) =
        this.zip(other) { thisByte, otherByte -> thisByte xor otherByte }.toByteArray()
}

标签： javakotlinencryptionaes

java - Kotlin 使用内置 ECB Java 实现实现 AES-CBC

问题描述

解决方案

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