MD5加密源代码
public class MD5 ...{
/**//*
* 下面这些S11-S44实际上是一个4*4的矩阵,在原始的C实现中是用#define 实现的, 这里把它们实现成为static
* final是表示了只读,切能在同一个进程空间内的多个 Instance间共享
*/
static final int S11 = 7;
static final int S12 = 12;
static final int S13 = 17;
static final int S14 = 22;
static final int S21 = 5;
static final int S22 = 9;
static final int S23 = 14;
static final int S24 = 20;
static final int S31 = 4;
static final int S32 = 11;
static final int S33 = 16;
static final int S34 = 23;
static final int S41 = 6;
static final int S42 = 10;
static final int S43 = 15;
static final int S44 = 21;
static final byte[] PADDING = ...{ -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0 };
/**//*
* 下面的三个成员是keyBean计算过程中用到的3个核心数据,在原始的C实现中 被定义到keyBean_CTX结构中
*
*/
private long[] state = new long[4]; // state (ABCD)
private long[] count = new long[2]; // number of bits, modulo 2^64 (lsb
// first)
private byte[] buffer = new byte[64]; // input buffer
/**//*
* digestHexStr是keyBean的唯一一个公共成员,是最新一次计算结果的 16进制ASCII表示.
*/
public String digestHexStr;
/**//*
* digest,是最新一次计算结果的2进制内部表示,表示128bit的keyBean值.
*/
private byte[] digest = new byte[16];
/**//*
* getkeyBeanofStr是类keyBean最主要的公共方法,入口参数是你想要进行keyBean变换的字符串
* 返回的是变换完的结果,这个结果是从公共成员digestHexStr取得的.
*/
public String getkeyBeanofStr(String inbuf) ...{
keyBeanInit();
keyBeanUpdate(inbuf.getBytes(), inbuf.length());
keyBeanFinal();
digestHexStr = "";
for (int i = 0; i < 16; i++) ...{
digestHexStr += byteHEX(digest[i]);
}
return digestHexStr;
}
// 这是keyBean这个类的标准构造函数,JavaBean要求有一个public的并且没有参数的构造函数
public MD5() ...{
keyBeanInit();
return;
}
/**//* keyBeanInit是一个初始化函数,初始化核心变量,装入标准的幻数 */
private void keyBeanInit() ...{
count[0] = 0L;
count[1] = 0L;
// /* Load magic initialization constants.
state[0] = 0x67452301L;
state[1] = 0xefcdab89L;
state[2] = 0x98badcfeL;
state[3] = 0x10325476L;
return;
}
/**//*
* F, G, H ,I 是4个基本的keyBean函数,在原始的keyBean的C实现中,由于它们是
* 简单的位运算,可能出于效率的考虑把它们实现成了宏,在java中,我们把它们 实现成了private方法,名字保持了原来C中的。
*/
private long F(long x, long y, long z) ...{
return (x & y) | ((~x) & z);
}
private long G(long x, long y, long z) ...{
return (x & z) | (y & (~z));
}
private long H(long x, long y, long z) ...{
return x ^ y ^ z;
}
private long I(long x, long y, long z) ...{
return y ^ (x | (~z));
}
/**//*
* FF,GG,HH和II将调用F,G,H,I进行近一步变换 FF, GG, HH, and II transformations for
* rounds 1, 2, 3, and 4. Rotation is separate from addition to prevent
* recomputation.
*/
private long FF(long a, long b, long c, long d, long x, long s, long ac) ...{
a +=
/**//*
* 下面这些S11-S44实际上是一个4*4的矩阵,在原始的C实现中是用#define 实现的, 这里把它们实现成为static
* final是表示了只读,切能在同一个进程空间内的多个 Instance间共享
*/
static final int S11 = 7;
static final int S12 = 12;
static final int S13 = 17;
static final int S14 = 22;
static final int S21 = 5;
static final int S22 = 9;
static final int S23 = 14;
static final int S24 = 20;
static final int S31 = 4;
static final int S32 = 11;
static final int S33 = 16;
static final int S34 = 23;
static final int S41 = 6;
static final int S42 = 10;
static final int S43 = 15;
static final int S44 = 21;
static final byte[] PADDING = ...{ -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0 };
/**//*
* 下面的三个成员是keyBean计算过程中用到的3个核心数据,在原始的C实现中 被定义到keyBean_CTX结构中
*
*/
private long[] state = new long[4]; // state (ABCD)
private long[] count = new long[2]; // number of bits, modulo 2^64 (lsb
// first)
private byte[] buffer = new byte[64]; // input buffer
/**//*
* digestHexStr是keyBean的唯一一个公共成员,是最新一次计算结果的 16进制ASCII表示.
*/
public String digestHexStr;
/**//*
* digest,是最新一次计算结果的2进制内部表示,表示128bit的keyBean值.
*/
private byte[] digest = new byte[16];
/**//*
* getkeyBeanofStr是类keyBean最主要的公共方法,入口参数是你想要进行keyBean变换的字符串
* 返回的是变换完的结果,这个结果是从公共成员digestHexStr取得的.
*/
public String getkeyBeanofStr(String inbuf) ...{
keyBeanInit();
keyBeanUpdate(inbuf.getBytes(), inbuf.length());
keyBeanFinal();
digestHexStr = "";
for (int i = 0; i < 16; i++) ...{
digestHexStr += byteHEX(digest[i]);
}
return digestHexStr;
}
// 这是keyBean这个类的标准构造函数,JavaBean要求有一个public的并且没有参数的构造函数
public MD5() ...{
keyBeanInit();
return;
}
/**//* keyBeanInit是一个初始化函数,初始化核心变量,装入标准的幻数 */
private void keyBeanInit() ...{
count[0] = 0L;
count[1] = 0L;
// /* Load magic initialization constants.
state[0] = 0x67452301L;
state[1] = 0xefcdab89L;
state[2] = 0x98badcfeL;
state[3] = 0x10325476L;
return;
}
/**//*
* F, G, H ,I 是4个基本的keyBean函数,在原始的keyBean的C实现中,由于它们是
* 简单的位运算,可能出于效率的考虑把它们实现成了宏,在java中,我们把它们 实现成了private方法,名字保持了原来C中的。
*/
private long F(long x, long y, long z) ...{
return (x & y) | ((~x) & z);
}
private long G(long x, long y, long z) ...{
return (x & z) | (y & (~z));
}
private long H(long x, long y, long z) ...{
return x ^ y ^ z;
}
private long I(long x, long y, long z) ...{
return y ^ (x | (~z));
}
/**//*
* FF,GG,HH和II将调用F,G,H,I进行近一步变换 FF, GG, HH, and II transformations for
* rounds 1, 2, 3, and 4. Rotation is separate from addition to prevent
* recomputation.
*/
private long FF(long a, long b, long c, long d, long x, long s, long ac) ...{
a +=