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MD5 在開發中進行加密和解密的工具類

package cn.hnedu.encrypt;

public class MD5 {

/**

* A class that implements the MD5 secure hash function.

/**

* Returns the MD5 hash digest transformed into a hex

* representation as <code>String</code>.

* @return the MD5 hash of the input as <code>String</code>.

public static String encoder(String str) {

return MD5.asHex(MD5.digest(str.getBytes()));

} //hash

/**

* Returns the MD5 hash of the input data.

* <p>

* Following the the MD5 standard specification, the result

* is returned least significant byte first, however,

* many applications use the most significant byte first (more conventional).

* @param msg the <code>byte[]</code> to be digested.

* @return the MD5 hash of the data as <code>String</code>.

public static byte[] digest(byte[] msg) {

int padsize = (120 - (msg.length % 64)) % 64;

int i;

long l = msg.length * 8;

// the MD5 "registers"

int a = 0x10325476, aa,

b = 0xefcdab89, bb,

c = 0x98badcfe, cc,

d = 0x10325476, dd;

byte[] src = new byte[msg.length + padsize + 8];

/* Append Padding Bits */

try {

System.arraycopy(msg, 0, src, 0, msg.length);

}

/* make compile happy even though this should never happen */

catch (ArrayIndexOutOfBoundsException e) {}

catch (ArrayStoreException e) {}

src[msg.length] = (byte) 0x80;

for (i = msg.length + 1; i < msg.length + padsize; i++) src[i] = 0;

/* Append Length */

for (i = src.length - 8; i < src.length; i++) {

src[i] = (byte) l;

l >>>= 8;

}

int[] x = new int[16];

/* Process Message in 16-word Blocks */

for (i = 0; i < src.length; i += 64) {

/* Construct block */

for (int j = 0; j < 16; j++) {

x[j] = 0;

for (int k = 3; k >= 0; k--) {

x[j] <<= 8;

x[j] += src[i + j * 4 + k] & 0xff;

// stupid sign-extended implicit conversion!!!

}

aa = a;

bb = b;

cc = c;

dd = d;

a = round1(a, b, c, d, 0, 7, 1, x);

d = round1(d, a, b, c, 1, 12, 2, x);

c = round1(c, d, a, b, 2, 17, 3, x);

b = round1(b, c, d, a, 3, 22, 4, x);

a = round1(a, b, c, d, 4, 7, 5, x);

d = round1(d, a, b, c, 5, 12, 6, x);

c = round1(c, d, a, b, 6, 17, 7, x);

b = round1(b, c, d, a, 7, 22, 8, x);

a = round1(a, b, c, d, 8, 7, 9, x);

d = round1(d, a, b, c, 9, 12, 10, x);

c = round1(c, d, a, b, 10, 17, 11, x);

b = round1(b, c, d, a, 11, 22, 12, x);

a = round1(a, b, c, d, 12, 7, 13, x);

d = round1(d, a, b, c, 13, 12, 14, x);

c = round1(c, d, a, b, 14, 17, 15, x);

b = round1(b, c, d, a, 15, 22, 16, x);

a = round2(a, b, c, d, 1, 5, 17, x);

d = round2(d, a, b, c, 6, 9, 18, x);

c = round2(c, d, a, b, 11, 14, 19, x);

b = round2(b, c, d, a, 0, 20, 20, x);

a = round2(a, b, c, d, 5, 5, 21, x);

d = round2(d, a, b, c, 10, 9, 22, x);

c = round2(c, d, a, b, 15, 14, 23, x);

b = round2(b, c, d, a, 4, 20, 24, x);

a = round2(a, b, c, d, 9, 5, 25, x);

d = round2(d, a, b, c, 14, 9, 26, x);

c = round2(c, d, a, b, 3, 14, 27, x);

b = round2(b, c, d, a, 8, 20, 28, x);

a = round2(a, b, c, d, 13, 5, 29, x);

d = round2(d, a, b, c, 2, 9, 30, x);

c = round2(c, d, a, b, 7, 14, 31, x);

b = round2(b, c, d, a, 12, 20, 32, x);

a = round3(a, b, c, d, 5, 4, 33, x);

d = round3(d, a, b, c, 8, 11, 34, x);

c = round3(c, d, a, b, 11, 16, 35, x);

b = round3(b, c, d, a, 14, 23, 36, x);

a = round3(a, b, c, d, 1, 4, 37, x);

d = round3(d, a, b, c, 4, 11, 38, x);

c = round3(c, d, a, b, 7, 16, 39, x);

b = round3(b, c, d, a, 10, 23, 40, x);

a = round3(a, b, c, d, 13, 4, 41, x);

d = round3(d, a, b, c, 0, 11, 42, x);

c = round3(c, d, a, b, 3, 16, 43, x);

b = round3(b, c, d, a, 6, 23, 44, x);

a = round3(a, b, c, d, 9, 4, 45, x);

d = round3(d, a, b, c, 12, 11, 46, x);

c = round3(c, d, a, b, 15, 16, 47, x);

b = round3(b, c, d, a, 2, 23, 48, x);

a = round4(a, b, c, d, 0, 6, 49, x);

d = round4(d, a, b, c, 7, 10, 50, x);

c = round4(c, d, a, b, 14, 15, 51, x);

b = round4(b, c, d, a, 5, 21, 52, x);

a = round4(a, b, c, d, 12, 6, 53, x);

d = round4(d, a, b, c, 3, 10, 54, x);

c = round4(c, d, a, b, 10, 15, 55, x);

b = round4(b, c, d, a, 1, 21, 56, x);

a = round4(a, b, c, d, 8, 6, 57, x);

d = round4(d, a, b, c, 15, 10, 58, x);

c = round4(c, d, a, b, 6, 15, 59, x);

b = round4(b, c, d, a, 13, 21, 60, x);

a = round4(a, b, c, d, 4, 6, 61, x);

d = round4(d, a, b, c, 11, 10, 62, x);

c = round4(c, d, a, b, 2, 15, 63, x);

b = round4(b, c, d, a, 9, 21, 64, x);

a += aa;

b += bb;

c += cc;

d += dd;

}

byte[] ret = new byte[16];

for (i = 0; i < 4; i++) {

ret[i] = (byte) a;

a >>>= 8;

}

for (; i < 8; i++) {

ret[i] = (byte) b;

b >>>= 8;

}

for (; i < 12; i++) {

ret[i] = (byte) c;

c >>>= 8;

}

for (; i < 16; i++) {

ret[i] = (byte) d;

d >>>= 8;

}

return ret;

} //digest

/** MD5 Transformation routines *********************************************/

private static int rot(int x, int s) {

return x << s | x >>> (32 - s);

}

private static int F(int x, int y, int z) {

return (x & y) | (~x & z);

}

private static int G(int x, int y, int z) {

return (x & z) | (y & ~z);

}

private static int H(int x, int y, int z) {

return x ^ y ^ z;

}

private static int I(int x, int y, int z) {

return y ^ (x | ~z);

}

private static int round1(int a, int b, int c, int d, int k, int s, int i,

int[] x) {

return b + rot( (a + F(b, c, d) + x[k] + T[i - 1]), s);

} //round1

private static int round2(int a, int b, int c, int d, int k, int s, int i,

int[] x) {

return b + rot( (a + G(b, c, d) + x[k] + T[i - 1]), s);

} //round2

private static int round3(int a, int b, int c, int d, int k, int s, int i,

int[] x) {

return b + rot( (a + H(b, c, d) + x[k] + T[i - 1]), s);

} //round3

private static int round4(int a, int b, int c, int d, int k, int s, int i,

int[] x) {

return b + rot( (a + I(b, c, d) + x[k] + T[i - 1]), s);

} //round4

private static int T[] = {

0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf,

0x4787c62a, 0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1,

0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562,

0xc040b340, 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681,

0xe7d3fbc8, 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905,

0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122,

0xfde5380c, 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6,

0xeaa127fa, 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8,

0xc4ac5665, 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3,

0x8f0ccc92, 0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314,

0x4e0811a1, 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391};

/** END MD5 Transformation routines *****************************************/

/**

* Returns a <code>String</code> containing unsigned hexadecimal

* numbers as digits.

* Contains two hex digit characters for each byte from the passed in

* <code>byte[]</code>.

* @param data the array of bytes to be converted into a hex-string.

* @return the generated hexadecimal representation as <code>String</code>.

public static String asHex(byte[] data) {

//double size, two bytes (hex range) for one byte

StringBuffer buf = new StringBuffer(data.length * 2);

for (int i = 0; i < data.length; i++) {

//don't forget the second hex digit

if ( ( (int) data[i] & 0xff) < 0x10) {

buf.append("0");

}

buf.append(Long.toString( (int) data[i] & 0xff, 16));

}

return buf.toString();

} //asHex

public static void main(String[] args) {

try {

System.out.println(MD5.encoder("123456"));

}

catch (Exception ex) {

ex.printStackTrace();

}

} //main

}

posted on 2011-06-01 12:29 斌哥閱讀(1992) 評論(0) 編輯收藏

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