MD5、SHA的加密

MD5、SHA加密，常用于加密用户名密码，当用户验证时。没有解密的方法。

java 代码

import java.security.MessageDigest;

public class Digest {

    public static void main(String[] args) throws Exception {
        String str = "abcdefghijklmnopqrstuvwxyz";
        byte[] data = str.getBytes();

        System.out.println("MD5: " + getDigest(data, "MD5"));
        System.out.println("SHA: " + getDigest(data, "SHA"));
        System.out.println("SHA_256: " + getDigest(data, "SHA-256"));
        System.out.println("SHA_384: " + getDigest(data, "SHA-384"));
        System.out.println("SHA_512: " + getDigest(data, "SHA-512"));
    }

    public static String getDigest(byte[] data, String algorithm)
            throws Exception {
        MessageDigest md5 = MessageDigest.getInstance(algorithm);
        md5.update(data);
        return toHexString(md5.digest());
    }

    public static String toHexString(byte[] b) {
        StringBuilder sb = new StringBuilder(b.length * 2);
        for (int i = 0; i < b.length; i++) {
            sb.append(HEXCHAR[(b[i] & 0xf0) >>> 4]);
            sb.append(HEXCHAR[b[i] & 0x0f]);
        }
        return sb.toString();
    }

    private static final char[] HEXCHAR = { '0', '1', '2', '3', '4', '5', '6', '7',
            '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
}

 

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RSA加密解密操作 | DES加密/解密操作

• 2007-10-23 14:02
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