kotlin 不可逆加密

这里说的不可逆加密有MD5 SHA1 SHA256

/**
 * 消息摘要
 * 不可逆
 */
object MessageDigetUtil {
    /**
     * 用户登录用的比较广泛
     */
    fun md5(input: String): String {
        val digest = MessageDigest.getInstance("MD5")
        val result = digest.digest(input.toByteArray())
        return toHex(result)
    }

    fun sha1(input: String): String {
        val digest = MessageDigest.getInstance("SHA-1")
        val result = digest.digest(input.toByteArray())
        return toHex(result)
    }

    fun sha256(input: String): String {
        val digest = MessageDigest.getInstance("SHA-256")
        val result = digest.digest(input.toByteArray())
        return toHex(result)
    }

    //转成16进制
    fun toHex(byteArray: ByteArray): String {

        //转成16进制
        val result = with(StringBuilder()) {
            byteArray.forEach {
                val value = it
                val hex = value.toInt() and (0xFF)
                val hexStr = Integer.toHexString(hex)
                //println(hexStr)
                if (hexStr.length == 1) {
                    //this.append("0").append(hexStr)
                    append("0").append(hexStr)
                } else {
                    //this.append(hexStr)
                    append(hexStr)
                }
            }
            this.toString()
        }
        return result

    }
}

fun main(args: Array) {
    //md5 16 加密后是16个字节  32 加密后转成16进制是32个字节
    //文字多长长度不变
    val input = "MD5加密"
    val md5 = MessageDigetUtil.md5(input)
    println("MD5加密：" + md5)
    println("MD5加密的长度：" + md5.toByteArray().size)

    val input1 = "SHA-1加密"
    val SHA = MessageDigetUtil.sha1(input1)
    println("SHA-1加密：" + SHA)
    println("SHA-1加密的长度：" + SHA.toByteArray().size)

    val input256 = "SHA-SHA256"
    val SHA256 = MessageDigetUtil.sha256(input256)
    println("SHA-SHA256：" + SHA256)
    println("SHA-SHA256的长度：" + SHA256.toByteArray().size)
}

转载表明出处

点击下载demo

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