Retrofit传参Map<String,Any>报错

在使用retrofit请求接口时报错了,参数:Map<String,Any>

Parameter type must not include a type variable or wildcard: java.util.Map<java.lang.String, ?>

问题是在值类型为Any,在JAVA里这个值就Object,查在kotlin里就变成*号了,Retrofit不能识别。
只需要添加@JvmSuppressWildcards接口即可

@JvmSuppressWildcards
internal interface WebService {
    ...
}

Android加密算法之RSA(二)

The RSA algorithm can only encrypt data that has a maximum byte length of the RSA key length in bits divided with eight minus eleven padding bytes, i.e. number of maximum bytes = key length in bits / 8 - 11.

使用RSA时,数据过长会报错,如:

javax.crypto.IllegalBlockSizeException: input must be under 256 bytes

因此,基本上,您将密钥长度除以8 -11(如果有填充)。例如,如果您具有2048位密钥,则可以加密2048/8 = 256字节(如果有填充则为11字节)。因此,可以使用更大的密钥,也可以使用对称密钥加密数据,然后使用rsa加密该密钥(推荐的方法)
参考:https://stackoverflow.com/questions/10007147/getting-a-illegalblocksizeexception-data-must-not-be-longer-than-256-bytes-when

通过分段加密解决

1.生成公钥私钥

@Throws(Exception::class)
    fun genKeyPair(): Map<String?, String> {
        val keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM)
        keyPairGen.initialize(2048)
        val keyPair = keyPairGen.generateKeyPair()
        val publicKey = keyPair.public as RSAPublicKey
        val privateKey = keyPair.private as RSAPrivateKey
        val keyMap: MutableMap<String?, String> = HashMap(2)
        keyMap[PUBLIC_KEY] = Base64.encodeToString(publicKey.encoded, Base64.DEFAULT)
        keyMap[PRIVATE_KEY] = Base64.encodeToString(privateKey.encoded, Base64.DEFAULT)
        return keyMap
    }

2.公钥加密

    @Throws(Exception::class)
    fun encryptByPublicKey(data: ByteArray, publicKey: String?): ByteArray {
        val keyBytes: ByteArray = Base64.decode(publicKey, Base64.DEFAULT)
        val x509KeySpec = X509EncodedKeySpec(keyBytes)
        val keyFactory = KeyFactory.getInstance(KEY_ALGORITHM)
        val publicK: Key = keyFactory.generatePublic(x509KeySpec)
        // 对数据加密
        val cipher = Cipher.getInstance(keyFactory.algorithm)
        cipher.init(Cipher.ENCRYPT_MODE, publicK)
        val inputLen = data.size
        val out = ByteArrayOutputStream()
        var offSet = 0
        var cache: ByteArray
        var i = 0
        // 对数据分段加密
        while (inputLen - offSet > 0) {
            cache = if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK)
            } else {
                cipher.doFinal(data, offSet, inputLen - offSet)
            }
            out.write(cache, 0, cache.size)
            i++
            offSet = i * MAX_ENCRYPT_BLOCK
        }
        val encryptedData = out.toByteArray()
        out.close()
        return encryptedData
    }

3.私钥解密

    @Throws(Exception::class)
    fun decryptByPrivateKey(encryptedData: ByteArray, privateKey: String?): ByteArray {
        val keyBytes: ByteArray = Base64.decode(privateKey, Base64.DEFAULT)
        val pkcs8KeySpec = PKCS8EncodedKeySpec(keyBytes)
        val keyFactory = KeyFactory.getInstance(KEY_ALGORITHM)
        val privateK: Key = keyFactory.generatePrivate(pkcs8KeySpec)
        val cipher = Cipher.getInstance(keyFactory.algorithm)
        cipher.init(Cipher.DECRYPT_MODE, privateK)
        val inputLen = encryptedData.size
        val out = ByteArrayOutputStream()
        var offSet = 0
        var cache: ByteArray
        var i = 0
        // 对数据分段解密
        while (inputLen - offSet > 0) {
            cache = if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK)
            } else {
                cipher.doFinal(encryptedData, offSet, inputLen - offSet)
            }
            out.write(cache, 0, cache.size)
            i++
            offSet = i * MAX_DECRYPT_BLOCK
        }
        val decryptedData = out.toByteArray()
        out.close()
        return decryptedData
    }

4.调用方法:

        val keyMap: Map<String?, String?> = RSACrypt.genKeyPair()
        val publicKey = keyMap[RSACrypt.PUBLIC_KEY]
        val privateKey = keyMap[RSACrypt.PRIVATE_KEY]
        val source =
            "身高一米七左右,标准的九头身,五官立体宛如艺术大师鬼斧神工之作,肌肤赛雪,宛如白玉般似能反射光彩。" +
            "“我和茹雪两情相悦,但对我们而言,你是第三者,所以请你自己主动退出,我愿意给你一笔钱,你开个价码吧!”啪,一声清脆的响声,干净利落地狠狠扇在韩斌的脸上。" +
            "乔智愿意当陶家的女婿,除了偿还父亲欠下的人情债之外,还有一个重要原因,陶茹雪本身出众,是琼金一枝花,知名度高,追求者众多。"
        val data = source.encodeToByteArray()
        val encodedData: ByteArray = RSACrypt.encryptByPublicKey(data, publicKey)
        Log.w("rsa", "加密后文字:${Base64.encodeToString(encodedData, Base64.DEFAULT)}")
        val decodedData: ByteArray = RSACrypt.decryptByPrivateKey(encodedData, privateKey)
        Log.w("rsa", "解密后文字: \r\n${String(decodedData)}")

完整代码

object RSACrypt {
    /**
     * 加密算法RSA
     */
    const val KEY_ALGORITHM = "RSA"

    /**
     * 签名算法
     */
    const val SIGNATURE_ALGORITHM = "MD5withRSA"

    /**
     * 获取公钥的key
     */
    const val PUBLIC_KEY = "RSAPublicKey"

    /**
     * 获取私钥的key
     */
    const val PRIVATE_KEY = "RSAPrivateKey"

    /**
     * RSA最大加密明文大小
     */
    private const val MAX_ENCRYPT_BLOCK = 245

    /**
     * RSA最大解密密文大小
     */
    private const val MAX_DECRYPT_BLOCK = 256

    /**
     * 生成密钥对(公钥和私钥)
     * @return
     * @throws Exception
     */
    @Throws(Exception::class)
    fun genKeyPair(): Map<String?, String> {
        val keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM)
        keyPairGen.initialize(2048)
        val keyPair = keyPairGen.generateKeyPair()
        val publicKey = keyPair.public as RSAPublicKey
        val privateKey = keyPair.private as RSAPrivateKey
        val keyMap: MutableMap<String?, String> = HashMap(2)
        keyMap[PUBLIC_KEY] = Base64.encodeToString(publicKey.encoded, Base64.DEFAULT)
        keyMap[PRIVATE_KEY] = Base64.encodeToString(privateKey.encoded, Base64.DEFAULT)
        return keyMap
    }

    /**
     * 私钥解密
     *
     * @param encryptedData 已加密数据
     * @param privateKey 私钥(BASE64编码)
     * @return
     * @throws Exception
     */
    @Throws(Exception::class)
    fun decryptByPrivateKey(encryptedData: ByteArray, privateKey: String?): ByteArray {
        val keyBytes: ByteArray = Base64.decode(privateKey, Base64.DEFAULT)
        val pkcs8KeySpec = PKCS8EncodedKeySpec(keyBytes)
        val keyFactory = KeyFactory.getInstance(KEY_ALGORITHM)
        val privateK: Key = keyFactory.generatePrivate(pkcs8KeySpec)
        val cipher = Cipher.getInstance(keyFactory.algorithm)
        cipher.init(Cipher.DECRYPT_MODE, privateK)
        val inputLen = encryptedData.size
        val out = ByteArrayOutputStream()
        var offSet = 0
        var cache: ByteArray
        var i = 0
        // 对数据分段解密
        while (inputLen - offSet > 0) {
            cache = if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
                cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK)
            } else {
                cipher.doFinal(encryptedData, offSet, inputLen - offSet)
            }
            out.write(cache, 0, cache.size)
            i++
            offSet = i * MAX_DECRYPT_BLOCK
        }
        val decryptedData = out.toByteArray()
        out.close()
        return decryptedData
    }

    /**
     *
     * 公钥加密
     *
     * @param data 源数据
     * @param publicKey 公钥(BASE64编码)
     * @return
     * @throws Exception
     */
    @Throws(Exception::class)
    fun encryptByPublicKey(data: ByteArray, publicKey: String?): ByteArray {
        val keyBytes: ByteArray = Base64.decode(publicKey, Base64.DEFAULT)
        val x509KeySpec = X509EncodedKeySpec(keyBytes)
        val keyFactory = KeyFactory.getInstance(KEY_ALGORITHM)
        val publicK: Key = keyFactory.generatePublic(x509KeySpec)
        // 对数据加密
        val cipher = Cipher.getInstance(keyFactory.algorithm)
        cipher.init(Cipher.ENCRYPT_MODE, publicK)
        val inputLen = data.size
        val out = ByteArrayOutputStream()
        var offSet = 0
        var cache: ByteArray
        var i = 0
        // 对数据分段加密
        while (inputLen - offSet > 0) {
            cache = if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
                cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK)
            } else {
                cipher.doFinal(data, offSet, inputLen - offSet)
            }
            out.write(cache, 0, cache.size)
            i++
            offSet = i * MAX_ENCRYPT_BLOCK
        }
        val encryptedData = out.toByteArray()
        out.close()
        return encryptedData
    }
}

Android加密算法之AES

什么是高级加密标准或AES?

AES加密标准又称为高级加密标准Rijndael加密法,是美国国家标准技术研究所NIST旨在取代DES的21世纪的加密标准。

AES加密如何工作?

AES是一种对称的加密算法,可基于相同的密钥进行加密和解密。AES包含三个分组密码:AES-128,AES-192和AES-256。每个密码分别使用128 位,192位和256位的加密密钥对128 位块中的数据进行加密和解密。代码:

object AESCrypt {
    private const val AES_MODE = "AES/CBC/PKCS7Padding" //"算法/模式/补码方式"
    private const val CHARSET = "UTF-8"
    private const val CIPHER = "AES"
    private const val HASH_ALGORITHM = "SHA-256"
    private val IV_BYTES = byteArrayOf(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)

    /**
     * Generates SHA256 hash of the password which is used as key
     *
     * @param password used to generated key
     * @return SHA256 of the password
     */
    @Throws(NoSuchAlgorithmException::class, UnsupportedEncodingException::class)
    private fun generateKey(password: String): SecretKeySpec {
        val digest = MessageDigest.getInstance(HASH_ALGORITHM)
        val bytes = password.toByteArray(charset(CHARSET))
        digest.update(bytes, 0, bytes.size)
        val key = digest.digest()

        return SecretKeySpec(key, CIPHER)
    }


    /**
     * Encrypt and encode message using 256-bit AES with key generated from password.
     *
     * @param password used to generated key
     * @param message  the thing you want to encrypt assumed String UTF-8
     * @return Base64 encoded CipherText
     * @throws GeneralSecurityException if problems occur during encryption
     */
    @Throws(GeneralSecurityException::class)
    fun encrypt(password: String, message: String): String {
        try {
            val key = generateKey(password)
            val cipherText = encrypt(key, IV_BYTES, message.toByteArray(charset(CHARSET)))
            //NO_WRAP is important as was getting \n at the end
            return Base64.encodeToString(cipherText, Base64.NO_WRAP)
        } catch (e: UnsupportedEncodingException) {
            throw GeneralSecurityException(e)
        }

    }


    /**
     * More flexible AES encrypt that doesn't encode
     *
     * @param key     AES key typically 128, 192 or 256 bit
     * @param iv      Initiation Vector
     * @param message in bytes (assumed it's already been decoded)
     * @return Encrypted cipher text (not encoded)
     * @throws GeneralSecurityException if something goes wrong during encryption
     */
    @Throws(GeneralSecurityException::class)
    fun encrypt(key: SecretKeySpec, iv: ByteArray, message: ByteArray): ByteArray {
        val cipher = Cipher.getInstance(AES_MODE)
        val ivSpec = IvParameterSpec(iv)
        cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec)
        return cipher.doFinal(message)
    }


    /**
     * Decrypt and decode ciphertext using 256-bit AES with key generated from password
     *
     * @param password                used to generated key
     * @param base64EncodedCipherText the encrpyted message encoded with base64
     * @return message in Plain text (String UTF-8)
     * @throws GeneralSecurityException if there's an issue decrypting
     */
    @Throws(GeneralSecurityException::class)
    fun decrypt(password: String, base64EncodedCipherText: String): String {

        try {
            val key = generateKey(password)
            val decodedCipherText = Base64.decode(base64EncodedCipherText, Base64.NO_WRAP)
            val decryptedBytes = decrypt(key, IV_BYTES, decodedCipherText)
            return String(decryptedBytes, charset(CHARSET))
        } catch (e: UnsupportedEncodingException) {
            throw GeneralSecurityException(e)
        }

    }

    /**
     * More flexible AES decrypt that doesn't encode
     *
     * @param key               AES key typically 128, 192 or 256 bit
     * @param iv                Initiation Vector
     * @param decodedCipherText in bytes (assumed it's already been decoded)
     * @return Decrypted message cipher text (not encoded)
     * @throws GeneralSecurityException if something goes wrong during encryption
     */
    @Throws(GeneralSecurityException::class)
    fun decrypt(key: SecretKeySpec, iv: ByteArray, decodedCipherText: ByteArray): ByteArray {
        val cipher = Cipher.getInstance(AES_MODE)
        val ivSpec = IvParameterSpec(iv)
        cipher.init(Cipher.DECRYPT_MODE, key, ivSpec)
        return cipher.doFinal(decodedCipherText)
    }
}

添加扩展方法,方便调用

private const val key: String = "Your AES Key"
    fun encrypt(input: String): String {
        return AESCrypt.encrypt(key, input)
    }

    fun decrypt(input: String): String {
        return AESCrypt.decrypt(key, input)
    }

    fun String.aesEncrypt(): String = encrypt(this)
    fun String.aesDecrypt(): String = decrypt(this)

使用方法

"明文".aesEncrypt()
"密文".aesDecrypt()

解决NestedScrollView嵌套RecyclerView滚动监听问题

不使用recyclerview的监听,直接用NestedScrollView的监听

scrollView.setOnScrollChangeListener(
            NestedScrollView.OnScrollChangeListener { v, scrollX, scrollY, oldScrollX, oldScrollY ->
                if (scrollY > oldScrollY) {
                    Log.i(TAG, "Scroll DOWN")
                }
                if (scrollY < oldScrollY) {
                    Log.i(TAG, "Scroll UP")
                }
                if (scrollY == 0) {
                    Log.i(TAG, "TOP SCROLL")
                }
                if (scrollY == v.getChildAt(0).measuredHeight - v.measuredHeight) {
                    Log.i(TAG, "BOTTOM SCROLL")
                }
            })