在Java中是否有任何方法可以生成一个字符串的MD5哈希?
当前回答
没必要把事情搞得太复杂。 DigestUtils工作得很好,使您在使用md5散列时感到舒适。
DigestUtils.md5Hex(_hash);
or
DigestUtils.md5(_hash);
您可以使用任何其他加密方法,如sha或md。
其他回答
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* MD5 encryption
*
* @author Hongten
*
*/
public class MD5 {
public static void main(String[] args) {
System.out.println(MD5.getMD5("123456"));
}
/**
* Use md5 encoded code value
*
* @param sInput
* clearly
* @ return md5 encrypted password
*/
public static String getMD5(String sInput) {
String algorithm = "";
if (sInput == null) {
return "null";
}
try {
algorithm = System.getProperty("MD5.algorithm", "MD5");
} catch (SecurityException se) {
}
MessageDigest md = null;
try {
md = MessageDigest.getInstance(algorithm);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
byte buffer[] = sInput.getBytes();
for (int count = 0; count < sInput.length(); count++) {
md.update(buffer, 0, count);
}
byte bDigest[] = md.digest();
BigInteger bi = new BigInteger(bDigest);
return (bi.toString(16));
}
}
Codingkit上有一篇关于这个的文章。查看:http://codingkit.com/a/JAVA/2013/1020/2216.html
import java.security.MessageDigest
val digest = MessageDigest.getInstance("MD5")
//Quick MD5 of text
val text = "MD5 this text!"
val md5hash1 = digest.digest(text.getBytes).map("%02x".format(_)).mkString
//MD5 of text with updates
digest.update("MD5 ".getBytes())
digest.update("this ".getBytes())
digest.update("text!".getBytes())
val md5hash2 = digest.digest().map(0xFF & _).map("%02x".format(_)).mkString
//Output
println(md5hash1 + " should be the same as " + md5hash2)
你需要java.security. messagdigest。
调用MessageDigest. getinstance ("MD5")来获取您可以使用的MessageDigest的MD5实例。
计算哈希的方法是:
以字节[]的形式提供整个输入,并使用md.digest(字节)在一次操作中计算哈希。 通过调用md.update(bytes)每次向MessageDigest提供一个字节[]块。当您完成添加输入字节时,计算与的散列 md.digest()。
md.digest()返回的字节[]是MD5散列。
是我做的…似乎还行-我相信有人会指出错误…
public final class MD5 {
public enum SaltOption {
BEFORE, AFTER, BOTH, NONE;
}
private static final String ALG = "MD5";
//For conversion to 2-char hex
private static final char[] digits = {
'0' , '1' , '2' , '3' , '4' , '5' ,
'6' , '7' , '8' , '9' , 'a' , 'b' ,
'c' , 'd' , 'e' , 'f' , 'g' , 'h' ,
'i' , 'j' , 'k' , 'l' , 'm' , 'n' ,
'o' , 'p' , 'q' , 'r' , 's' , 't' ,
'u' , 'v' , 'w' , 'x' , 'y' , 'z'
};
private SaltOption opt;
/**
* Added the SaltOption constructor since everybody
* has their own standards when it comes to salting
* hashes.
*
* This gives the developer the option...
*
* @param option The salt option to use, BEFORE, AFTER, BOTH or NONE.
*/
public MD5(final SaltOption option) {
//TODO: Add Char Encoding options too... I was too lazy!
this.opt = option;
}
/**
*
* Returns the salted MD5 checksum of the text passed in as an argument.
*
* If the salt is an empty byte array - no salt is applied.
*
* @param txt The text to run through the MD5 algorithm.
* @param salt The salt value in bytes.
* @return The salted MD5 checksum as a <code>byte[]</code>
* @throws NoSuchAlgorithmException
*/
private byte[] createChecksum(final String txt, final byte[] salt) throws NoSuchAlgorithmException {
final MessageDigest complete = MessageDigest.getInstance(ALG);
if(opt.equals(SaltOption.BEFORE) || opt.equals(SaltOption.BOTH)) {
complete.update(salt);
}
complete.update(txt.getBytes());
if(opt.equals(SaltOption.AFTER) || opt.equals(SaltOption.BOTH)) {
complete.update(salt);
}
return complete.digest();
}
/**
*
* Returns the salted MD5 checksum of the file passed in as an argument.
*
* If the salt is an empty byte array - no salt is applied.
*
* @param fle The file to run through the MD5 algorithm.
* @param salt The salt value in bytes.
* @return The salted MD5 checksum as a <code>byte[]</code>
* @throws IOException
* @throws NoSuchAlgorithmException
*/
private byte[] createChecksum(final File fle, final byte[] salt)
throws IOException, NoSuchAlgorithmException {
final byte[] buffer = new byte[1024];
final MessageDigest complete = MessageDigest.getInstance(ALG);
if(opt.equals(SaltOption.BEFORE) || opt.equals(SaltOption.BOTH)) {
complete.update(salt);
}
int numRead;
InputStream fis = null;
try {
fis = new FileInputStream(fle);
do {
numRead = fis.read(buffer);
if (numRead > 0) {
complete.update(buffer, 0, numRead);
}
} while (numRead != -1);
} finally {
if (fis != null) {
fis.close();
}
}
if(opt.equals(SaltOption.AFTER) || opt.equals(SaltOption.BOTH)) {
complete.update(salt);
}
return complete.digest();
}
/**
*
* Efficiently converts a byte array to its 2 char per byte hex equivalent.
*
* This was adapted from JDK code in the Integer class, I just didn't like
* having to use substrings once I got the result...
*
* @param b The byte array to convert
* @return The converted String, 2 chars per byte...
*/
private String convertToHex(final byte[] b) {
int x;
int charPos;
int radix;
int mask;
final char[] buf = new char[32];
final char[] tmp = new char[3];
final StringBuilder md5 = new StringBuilder();
for (int i = 0; i < b.length; i++) {
x = (b[i] & 0xFF) | 0x100;
charPos = 32;
radix = 1 << 4;
mask = radix - 1;
do {
buf[--charPos] = digits[x & mask];
x >>>= 4;
} while (x != 0);
System.arraycopy(buf, charPos, tmp, 0, (32 - charPos));
md5.append(Arrays.copyOfRange(tmp, 1, 3));
}
return md5.toString();
}
/**
*
* Returns the salted MD5 checksum of the file passed in as an argument.
*
* @param fle The file you want want to run through the MD5 algorithm.
* @param salt The salt value in bytes
* @return The salted MD5 checksum as a 2 char per byte HEX <code>String</code>
* @throws NoSuchAlgorithmException
* @throws IOException
*/
public String getMD5Checksum(final File fle, final byte[] salt)
throws NoSuchAlgorithmException, IOException {
return convertToHex(createChecksum(fle, salt));
}
/**
*
* Returns the MD5 checksum of the file passed in as an argument.
*
* @param fle The file you want want to run through the MD5 algorithm.
* @return The MD5 checksum as a 2 char per byte HEX <code>String</code>
* @throws NoSuchAlgorithmException
* @throws IOException
*/
public String getMD5Checksum(final File fle)
throws NoSuchAlgorithmException, IOException {
return convertToHex(createChecksum(fle, new byte[0]));
}
/**
*
* Returns the salted MD5 checksum of the text passed in as an argument.
*
* @param txt The text you want want to run through the MD5 algorithm.
* @param salt The salt value in bytes.
* @return The salted MD5 checksum as a 2 char per byte HEX <code>String</code>
* @throws NoSuchAlgorithmException
* @throws IOException
*/
public String getMD5Checksum(final String txt, final byte[] salt)
throws NoSuchAlgorithmException {
return convertToHex(createChecksum(txt, salt));
}
/**
*
* Returns the MD5 checksum of the text passed in as an argument.
*
* @param txt The text you want want to run through the MD5 algorithm.
* @return The MD5 checksum as a 2 char per byte HEX <code>String</code>
* @throws NoSuchAlgorithmException
* @throws IOException
*/
public String getMD5Checksum(final String txt)
throws NoSuchAlgorithmException {
return convertToHex(createChecksum(txt, new byte[0]));
}
}
Spring中也有一个DigestUtils类:
http://static.springsource.org/spring/docs/3.0.x/javadoc-api/org/springframework/util/DigestUtils.html
这个类包含md5DigestAsHex()方法来完成这项工作。
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