Java Security with MessageDigest

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Hi, I'm developing a Java project that requires the implementation of Java Hashing algorithms such as MD5 or SHA-256. The current implementation according to the Java API is:

Java

MessageDigest md = MessageDigest.getInstance("SHA");
 try {
     md.update(toChapter1);
     MessageDigest tc1 = md.clone();
     byte[] toChapter1Digest = tc1.digest();
     md.update(toChapter2);
     ...etc.
 } catch (CloneNotSupportedException cnse) {
     throw new DigestException("couldn't make digest of partial content");
 }

How do I implement the complete solution to store the hashed value in a MySQL database?

Posted 25-Apr-12 21:51pm

Patrick Wanjau

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Mayur Raiyani · Answer 1 · 2012-11-26T19:37:00

You can use SHA-256 to create digest from string.
Below is code snippet for you.

String password = "password";
 
MessageDigest md = MessageDigest.getInstance("SHA-256");
md.update(password.getBytes());
 
byte data[] = md.digest();
 
//convert the byte to hex format
StringBuffer sb = new StringBuffer();
for (int i = 0; i < data.length; i++) {
    sb.append(Integer.toString((byteData[i] & 0xff) + 0x100, 16).substring(1));
}
 
System.out.println("Digest in Hex: " + sb.toString());