public class MD5 {
public static String getMD5(String str) {
return getMD5(str.getBytes());
} public static String getMD5(byte[] source) {
String s = null;
char hexDigits[] = { // 用来将字节转换成 16 进制表示的字符
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
'e', 'f' };
try {
java.security.MessageDigest md = java.security.MessageDigest
.getInstance("MD5");
md.update(source);
byte tmp[] = md.digest(); // MD5 的计算结果是一个 128 位的长整数,
// 用字节表示就是 16 个字节
char str[] = new char[16 * 2]; // 每个字节用 16 进制表示的话,使用两个字符,
// 所以表示成 16 进制需要 32 个字符
int k = 0; // 表示转换结果中对应的字符位置
for (int i = 0; i < 16; i++) { // 从第一个字节开始,对 MD5 的每一个字节
// 转换成 16 进制字符的转换
byte byte0 = tmp[i]; // 取第 i 个字节
str[k++] = hexDigits[byte0 >>> 4 & 0xf]; // 取字节中高 4 位的数字转换,
// >>> 为逻辑右移,将符号位一起右移
str[k++] = hexDigits[byte0 & 0xf]; // 取字节中低 4 位的数字转换
}
s = new String(str); // 换后的结果转换为字符串
} catch (Exception e) {
e.printStackTrace();
}
return s;
} public static void main(String[] args) {
System.out.println(MD5.getMD5("1234"));
// String str = "900150983cd24fb0d6963f7d28e17f72";
// System.out.println(MD5.getMD5(str.));
// System.out.println(MD5.getMD5());
}
public static String getMD5(String str) {
return getMD5(str.getBytes());
} public static String getMD5(byte[] source) {
String s = null;
char hexDigits[] = { // 用来将字节转换成 16 进制表示的字符
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
'e', 'f' };
try {
java.security.MessageDigest md = java.security.MessageDigest
.getInstance("MD5");
md.update(source);
byte tmp[] = md.digest(); // MD5 的计算结果是一个 128 位的长整数,
// 用字节表示就是 16 个字节
char str[] = new char[16 * 2]; // 每个字节用 16 进制表示的话,使用两个字符,
// 所以表示成 16 进制需要 32 个字符
int k = 0; // 表示转换结果中对应的字符位置
for (int i = 0; i < 16; i++) { // 从第一个字节开始,对 MD5 的每一个字节
// 转换成 16 进制字符的转换
byte byte0 = tmp[i]; // 取第 i 个字节
str[k++] = hexDigits[byte0 >>> 4 & 0xf]; // 取字节中高 4 位的数字转换,
// >>> 为逻辑右移,将符号位一起右移
str[k++] = hexDigits[byte0 & 0xf]; // 取字节中低 4 位的数字转换
}
s = new String(str); // 换后的结果转换为字符串
} catch (Exception e) {
e.printStackTrace();
}
return s;
} public static void main(String[] args) {
System.out.println(MD5.getMD5("1234"));
// String str = "900150983cd24fb0d6963f7d28e17f72";
// System.out.println(MD5.getMD5(str.));
// System.out.println(MD5.getMD5());
}
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if (list.size() > 0) {
Sysuser sysuser = (Sysuser) list.get(0);
System.out.println(MD5.getMD5(password)); // 900150983cd24fb0d6963f7d28e17f72
System.out.println(sysuser.getPassword());// 900150983cd24fb0d6963f7d28e17f72
System.out.println(sysuser.getPassword().equals(
MD5.getMD5(password))); // false if (sysuser.getPassword().equals(MD5.getMD5(password))) {
return sysuser; } }
return null;
}
Sysuser uSysuser = new UserBizImpl().login("zhagsan", "abc"); if (uSysuser != null) {
System.out.println(uSysuser.getUsername());
System.err.println(uSysuser.getPassword());
} }
System.out.println(sysuser.getPassword());// 900150983cd24fb0d6963f7d28e17f72
System.out.println(sysuser.getPassword().equals(
MD5.getMD5(password))); // false 我都崩溃了~
我也不知道原因哦
两个值一样的话,这样应该是true啊~
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 char Hex[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
'9', 'A', 'B', 'C', 'D', 'E', 'F' };
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 };
private long state[];
private long count[];
private byte buffer[];
public String digestHexStr;
private byte digest[];
private byte test; public String getMD5ofStr(String s) {// 返回MD5串;
int i;
md5Init();
md5Update(s.getBytes(), s.length());
md5Final();
digestHexStr = "";
for (i = 0; i < 16; i++)
digestHexStr = digestHexStr + byteHEX(digest[i]);
return digestHexStr;
} public MD5() {
state = new long[4];
count = new long[2];
buffer = new byte[64];
digest = new byte[16];
md5Init();
} private void md5Init() {// 初始化部分变量;
count[0] = 0L;
count[1] = 0L;
state[0] = 0x67452301L;
state[1] = 0xefcdab89L;
state[2] = 0x98badcfeL;
state[3] = 0x10325476L;
} private long F(long l, long l1, long l2) {
return l & l1 | ~l & l2;
} private long G(long l, long l1, long l2) {
return l & l2 | l1 & ~l2;
} private long H(long l, long l1, long l2) {
return l ^ l1 ^ l2;
} private long I(long l, long l1, long l2) {
return l1 ^ (l | ~l2);
} private long FF(long l, long l1, long l2, long l3, long l4, long l5, long l6) {
l += F(l1, l2, l3) + l4 + l6;
l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5);
l += l1;
return l;
} private long GG(long l, long l1, long l2, long l3, long l4, long l5, long l6) {
l += G(l1, l2, l3) + l4 + l6;
l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5);
l += l1;
return l;
} private long HH(long l, long l1, long l2, long l3, long l4, long l5, long l6) {
l += H(l1, l2, l3) + l4 + l6;
l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5);
l += l1;
return l;
} private long II(long l, long l1, long l2, long l3, long l4, long l5, long l6) {
l += I(l1, l2, l3) + l4 + l6;
l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5);
l += l1;
return l;
} private void md5Update(byte abyte0[], int i) {// 补位操作,abyte0为需要进行MD5加密的字符串,i为字符串长度;
byte abyte1[] = new byte[64];
int k = (int) (count[0] >>> 3) & 0x3f;
if ((count[0] += i << 3) < (long) (i << 3))
count[1]++;
count[1] += i >>> 29;
int l = 64 - k;
int j;
if (i >= l) {
md5Memcpy(buffer, abyte0, k, 0, l);
md5Transform(buffer);
for (j = l; j + 63 < i; j += 64) {
md5Memcpy(abyte1, abyte0, 0, j, 64);
md5Transform(abyte1);
}
k = 0;
} else {
j = 0;
}
md5Memcpy(buffer, abyte0, k, j, i - j);
} private void md5Final() {// 最终处理,将得到的128位(16字节)MD5码存放在digest数组中
byte abyte0[] = new byte[8];
Encode(abyte0, count, 8);
int i = (int) (count[0] >>> 3) & 0x3f;
int j = i >= 56 ? 120 - i : 56 - i;
md5Update(PADDING, j);
md5Update(abyte0, 8);
Encode(digest, state, 16);
} private void md5Memcpy(byte abyte0[], byte abyte1[], int i, int j, int k) {
for (int l = 0; l < k; l++)
abyte0[i + l] = abyte1[j + l];
} private void md5Transform(byte abyte0[]) {
long l = state[0];
long l1 = state[1];
long l2 = state[2];
long l3 = state[3];
long al[] = new long[16];
Decode(al, abyte0, 64);
l = FF(l, l1, l2, l3, al[0], 7L, 0xd76aa478L);
l3 = FF(l3, l, l1, l2, al[1], 12L, 0xe8c7b756L);
l2 = FF(l2, l3, l, l1, al[2], 17L, 0x242070dbL);
l1 = FF(l1, l2, l3, l, al[3], 22L, 0xc1bdceeeL);
l = FF(l, l1, l2, l3, al[4], 7L, 0xf57c0fafL);
l3 = FF(l3, l, l1, l2, al[5], 12L, 0x4787c62aL);
l2 = FF(l2, l3, l, l1, al[6], 17L, 0xa8304613L);
l1 = FF(l1, l2, l3, l, al[7], 22L, 0xfd469501L);
l = FF(l, l1, l2, l3, al[8], 7L, 0x698098d8L);
l3 = FF(l3, l, l1, l2, al[9], 12L, 0x8b44f7afL);
l2 = FF(l2, l3, l, l1, al[10], 17L, 0xffff5bb1L);
l1 = FF(l1, l2, l3, l, al[11], 22L, 0x895cd7beL);
l = FF(l, l1, l2, l3, al[12], 7L, 0x6b901122L);
l3 = FF(l3, l, l1, l2, al[13], 12L, 0xfd987193L);
l2 = FF(l2, l3, l, l1, al[14], 17L, 0xa679438eL);
l1 = FF(l1, l2, l3, l, al[15], 22L, 0x49b40821L);
l = GG(l, l1, l2, l3, al[1], 5L, 0xf61e2562L);
l3 = GG(l3, l, l1, l2, al[6], 9L, 0xc040b340L);
l2 = GG(l2, l3, l, l1, al[11], 14L, 0x265e5a51L);
l1 = GG(l1, l2, l3, l, al[0], 20L, 0xe9b6c7aaL);
l = GG(l, l1, l2, l3, al[5], 5L, 0xd62f105dL);
l3 = GG(l3, l, l1, l2, al[10], 9L, 0x2441453L);
l2 = GG(l2, l3, l, l1, al[15], 14L, 0xd8a1e681L);
l1 = GG(l1, l2, l3, l, al[4], 20L, 0xe7d3fbc8L);
l = GG(l, l1, l2, l3, al[9], 5L, 0x21e1cde6L);
l3 = GG(l3, l, l1, l2, al[14], 9L, 0xc33707d6L);
l2 = GG(l2, l3, l, l1, al[3], 14L, 0xf4d50d87L);
l1 = GG(l1, l2, l3, l, al[8], 20L, 0x455a14edL);
l = GG(l, l1, l2, l3, al[13], 5L, 0xa9e3e905L);
l3 = GG(l3, l, l1, l2, al[2], 9L, 0xfcefa3f8L);
l2 = GG(l2, l3, l, l1, al[7], 14L, 0x676f02d9L);
l1 = GG(l1, l2, l3, l, al[12], 20L, 0x8d2a4c8aL);
l = HH(l, l1, l2, l3, al[5], 4L, 0xfffa3942L);
l3 = HH(l3, l, l1, l2, al[8], 11L, 0x8771f681L);
l2 = HH(l2, l3, l, l1, al[11], 16L, 0x6d9d6122L);
l1 = HH(l1, l2, l3, l, al[14], 23L, 0xfde5380cL);
l = HH(l, l1, l2, l3, al[1], 4L, 0xa4beea44L);
l3 = HH(l3, l, l1, l2, al[4], 11L, 0x4bdecfa9L);
l2 = HH(l2, l3, l, l1, al[7], 16L, 0xf6bb4b60L);
l1 = HH(l1, l2, l3, l, al[10], 23L, 0xbebfbc70L);
l = HH(l, l1, l2, l3, al[13], 4L, 0x289b7ec6L);
l3 = HH(l3, l, l1, l2, al[0], 11L, 0xeaa127faL);
l2 = HH(l2, l3, l, l1, al[3], 16L, 0xd4ef3085L);
l1 = HH(l1, l2, l3, l, al[6], 23L, 0x4881d05L);
l = HH(l, l1, l2, l3, al[9], 4L, 0xd9d4d039L);
l3 = HH(l3, l, l1, l2, al[12], 11L, 0xe6db99e5L);
l2 = HH(l2, l3, l, l1, al[15], 16L, 0x1fa27cf8L);
l1 = HH(l1, l2, l3, l, al[2], 23L, 0xc4ac5665L);
l = II(l, l1, l2, l3, al[0], 6L, 0xf4292244L);
l3 = II(l3, l, l1, l2, al[7], 10L, 0x432aff97L);
l2 = II(l2, l3, l, l1, al[14], 15L, 0xab9423a7L);
l1 = II(l1, l2, l3, l, al[5], 21L, 0xfc93a039L);
l = II(l, l1, l2, l3, al[12], 6L, 0x655b59c3L);
l3 = II(l3, l, l1, l2, al[3], 10L, 0x8f0ccc92L);
l2 = II(l2, l3, l, l1, al[10], 15L, 0xffeff47dL);
l1 = II(l1, l2, l3, l, al[1], 21L, 0x85845dd1L);
l = II(l, l1, l2, l3, al[8], 6L, 0x6fa87e4fL);
l3 = II(l3, l, l1, l2, al[15], 10L, 0xfe2ce6e0L);
l2 = II(l2, l3, l, l1, al[6], 15L, 0xa3014314L);
l1 = II(l1, l2, l3, l, al[13], 21L, 0x4e0811a1L);
l = II(l, l1, l2, l3, al[4], 6L, 0xf7537e82L);
l3 = II(l3, l, l1, l2, al[11], 10L, 0xbd3af235L);
l2 = II(l2, l3, l, l1, al[2], 15L, 0x2ad7d2bbL);
l1 = II(l1, l2, l3, l, al[9], 21L, 0xeb86d391L);
state[0] += l;
state[1] += l1;
state[2] += l2;
state[3] += l3;
} private void Encode(byte abyte0[], long al[], int i) {// 转换函数,将al中long型的变量输出到byte型的数组abyte0中,
// 低位字节在前,高位字节在后;
int j = 0;
for (int k = 0; k < i; k += 4) {
abyte0[k] = (byte) (int) (al[j] & 255L);
abyte0[k + 1] = (byte) (int) (al[j] >>> 8 & 255L);
abyte0[k + 2] = (byte) (int) (al[j] >>> 16 & 255L);
abyte0[k + 3] = (byte) (int) (al[j] >>> 24 & 255L);
j++;
}
} private void Decode(long al[], byte abyte0[], int i) {
int j = 0;
for (int k = 0; k < i; k += 4) {
al[j] = b2iu(abyte0[k]) | b2iu(abyte0[k + 1]) << 8
| b2iu(abyte0[k + 2]) << 16 | b2iu(abyte0[k + 3]) << 24;
j++;
}
} public static long b2iu(byte byte0) {
return byte0 >= 0 ? byte0 : byte0 & 0xff;
} public static String byteHEX(byte byte0) {// 字节到十六进制的ASCII码转换
char ac[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',
'B', 'C', 'D', 'E', 'F' };
char ac1[] = new char[2];
ac1[0] = ac[byte0 >>> 4 & 0xf];
ac1[1] = ac[byte0 & 0xf];
String s = new String(ac1);
return s;
} /**
* 传入参数进行MD5不可逆加密,调用此方法
* @param s 参数
* @return 加密后数字
*/
public static String toMD5(String s) {
MD5 md5 = new MD5();
return md5.getMD5ofStr(s);
}
}