encryption in java
The SHA hash functions are a set of cryptographic hash functions designed by the National Security Agency (NSA) and published by the NIST as a U.S. Federal Information Processing Standard.
SHA stands for Secure Hash Algorithm.
The three SHA algorithms are structured differently and are distinguished as SHA-0, SHA-1, and SHA-2. The SHA-2 family uses an identical algorithm with a variable digest size which is distinguished as SHA-224, SHA-256, SHA-384, and SHA-512.
SHA-1: The Secure Hash Algorithm (SHA) was developed by NIST and is specified in the Secure Hash Standard (SHS, FIPS 180). SHA-1 is a revision to this version and was published in 1994. It is also described in the ANSI X9.30 (part 2) standard. SHA-1 produces a 160-bit (20 byte) message digest. Although slower than MD5, this larger digest size makes it stronger against brute force attacks.
SHA stands for Secure Hash Algorithm.
The three SHA algorithms are structured differently and are distinguished as SHA-0, SHA-1, and SHA-2. The SHA-2 family uses an identical algorithm with a variable digest size which is distinguished as SHA-224, SHA-256, SHA-384, and SHA-512.
MD5: MD5 was developed by Professor Ronald L. Rivest in 1994. Its 128 bit (16 byte) message digest makes it a faster implementation than SHA-1.
Data Encryption using SHA - 512
import java.security.MessageDigest;
import java.math.BigInteger.*;
public class Encryption
{
public static String Password(String data)
{
StringBuffer sb = new StringBuffer();
try {
MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");
messageDigest.update(data.getBytes("UTF-8"));
byte[] digestBytes = messageDigest.digest();
String hex = null;
for (int i = 0; i < digestBytes.length; i++)
{
hex = Integer.toHexString(0xFF & digestBytes[i]);
if (hex.length() < 2)
sb.append("0");
sb.append(hex);
}
String psw = sb.toString();
}
catch (Exception ex)
{
System.out.println(ex.getMessage());
}
return new String(sb);
}
public static void main(String[] args)
{
Encryption e = new Encryption();
String s1 = e.Password("ankit");
System.out.println("Encrypted String is "+s1);
}
}
import java.math.BigInteger.*;
public class Encryption
{
public static String Password(String data)
{
StringBuffer sb = new StringBuffer();
try {
MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");
messageDigest.update(data.getBytes("UTF-8"));
byte[] digestBytes = messageDigest.digest();
String hex = null;
for (int i = 0; i < digestBytes.length; i++)
{
hex = Integer.toHexString(0xFF & digestBytes[i]);
if (hex.length() < 2)
sb.append("0");
sb.append(hex);
}
String psw = sb.toString();
}
catch (Exception ex)
{
System.out.println(ex.getMessage());
}
return new String(sb);
}
public static void main(String[] args)
{
Encryption e = new Encryption();
String s1 = e.Password("ankit");
System.out.println("Encrypted String is "+s1);
}
}
Data Encryption using MD5
import java.math.*;
import java.security.*;
import java.security.MessageDigest;
class encrypt1
{
public static void main(String[] arr)
{
try {
String toEnc = "ankit"; // Value to encrypt
MessageDigest mdEnc = MessageDigest.getInstance("MD5"); // Encryption algorithm
mdEnc.update(toEnc.getBytes(), 0, toEnc.length());
String md5 = new BigInteger(1, mdEnc.digest()).toString(16); // Encrypted string
System.out.println(md5);
}
catch (Exception ex)
{
System.out.println(ex.getMessage());
}
}
}
import java.security.*;
import java.security.MessageDigest;
class encrypt1
{
public static void main(String[] arr)
{
try {
String toEnc = "ankit"; // Value to encrypt
MessageDigest mdEnc = MessageDigest.getInstance("MD5"); // Encryption algorithm
mdEnc.update(toEnc.getBytes(), 0, toEnc.length());
String md5 = new BigInteger(1, mdEnc.digest()).toString(16); // Encrypted string
System.out.println(md5);
}
catch (Exception ex)
{
System.out.println(ex.getMessage());
}
}
}
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