MD5中的几个变换函数

private static int A = 0x67452301;
private static int B = 0xefcdab89;
private static int C = 0x98badcfe;
private static int D = 0x10325476;


// F(X,Y,Z) = XY v not(X) Z
// #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
private static int F(int x, int y, int z) {
	return (((x) & (y)) | ((~x) & (z)));
}

// G(X,Y,Z) = XZ v Y not(Z)
// #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
private static int G(int x, int y, int z) {
	return (((x) & (z)) | ((y) & (~z)));
}

// H(X,Y,Z) = X xor Y xor Z
// #define H(x, y, z) ((x) ^ (y) ^ (z))
private static int H(int x, int y, int z) {
	return ((x) ^ (y) ^ (z));
}

// I(X,Y,Z) = Y xor (X v not(Z))
// #define I(x, y, z) ((y) ^ ((x) | (~z)))
private static int I(int x, int y, int z) {
	return ((y) ^ ((x) | (~z)));
}

// #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
private static int rotateLeft(int x, int n) {
	return (((x) << (n)) | ((x) >> (32-(n))));
}

// #define FF(a, b, c, d, x, s, ac) { \
//  (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
//  (a) = ROTATE_LEFT ((a), (s)); \
//  (a) += (b); \
//   }
private static int FF(int a, int b, int c, int d, int x, int s, int ac) {
	a += F(b, c, d) + x + ac;
	a = rotateLeft(a, s);
	a += b;
	return a;
}

// #define GG(a, b, c, d, x, s, ac) { \
//	(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
//	(a) = ROTATE_LEFT ((a), (s)); \
//	(a) += (b); \
//	 }
private static int GG(int a, int b, int c, int d, int x, int s, int ac) {
	a += G(b, c, d) + x + ac;
	a = rotateLeft(a, s);
	a += b;
	return a;
}

// #define HH(a, b, c, d, x, s, ac) { \
//  (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
//  (a) = ROTATE_LEFT ((a), (s)); \
//  (a) += (b); \
//   }
private static int HH(int a, int b, int c, int d, int x, int s, int ac) {
	a += H(b, c, d) + x + ac;
	a = rotateLeft(a, s);
	a += b;
	return a;
}

// #define II(a, b, c, d, x, s, ac) { \
//  (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
//  (a) = ROTATE_LEFT ((a), (s)); \
//  (a) += (b); \
//   }
private static int II(int a, int b, int c, int d, int x, int s, int ac) {
	a += I(b, c, d) + x + ac;
	a = rotateLeft(a, s);
	a += b;
	return a;
}