Common tools (18)--md5 sha1 sha256 sha512 tools

import java.security.MessageDigest;


public class EncryptionDecryptionUtil {
    
    
    private enum DigestType {
    
    
        MD5("MD5"), SHA("SHA"), SHA256("SHA-256"), SHA512("SHA-512");

        private String digestDesc;

        private DigestType(String digestDesc) {
    
    
            this.digestDesc = digestDesc;
        }

        public String getDigestDesc() {
    
    
            return digestDesc;
        }
    }

    private final static String digest(String sourceStr, DigestType type) {
    
    
        char hexDigits[] = {
    
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
        try {
    
    
            byte[] btInput = sourceStr.getBytes();
            // 获得MD5摘要算法的MessageDigest对象
            MessageDigest mdInst = MessageDigest.getInstance(type.digestDesc);
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 将密文转换成十六进制的字符串形式
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
    
    
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
    
    
            e.printStackTrace();
            return null;
        }
    }

    public final static String MD5(String s) {
    
    
        return digest(s, DigestType.MD5);
    }

    public final static String SHA(String s) {
    
    
        return digest(s, DigestType.SHA);
    }

    public final static String SHA256(String s) {
    
    
        return digest(s, DigestType.SHA256);
    }

    public final static String SHA512(String s) {
    
    
        return digest(s, DigestType.SHA512);
    }
}