Admin: 1 версия

2010-06-01T06:48:41Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:45Z

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== Basic IO example using SHA1 ==



<source lang="java">
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.security.DigestInputStream;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import java.security.Security;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
/**
* Basic IO example using SHA1
*/
public class MainClass {
public static void main(String[] args) throws Exception {
Security.addProvider(new BouncyCastleProvider());
byte[] input = "www.jexp.ru".getBytes();
System.out.println("input : " + new String(input));
MessageDigest hash = MessageDigest.getInstance("SHA1");
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(input);
DigestInputStream digestInputStream = new DigestInputStream(byteArrayInputStream, hash);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
int ch;
while ((ch = digestInputStream.read()) >= 0) {
byteArrayOutputStream.write(ch);
}
byte[] newInput = byteArrayOutputStream.toByteArray();
System.out.println("in digest : " + new String(digestInputStream.getMessageDigest().digest()));
byteArrayOutputStream = new ByteArrayOutputStream();
DigestOutputStream digestOutputStream = new DigestOutputStream(byteArrayOutputStream, hash);
digestOutputStream.write(newInput);
digestOutputStream.close();
System.out.println("out digest: " + new String(digestOutputStream.getMessageDigest().digest()));
}
}

</source>



== Basic IO example with CTR using AES ==



<source lang="java">
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
/**
* Basic IO example with CTR using AES
*/
public class MainClass {
public static void main(String[] args) throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] input = "www.jexp.ru".getBytes();
byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 };
byte[] ivBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x02, 0x03, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x01 };
SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
System.out.println("input : " + new String(input));
// encryption pass
cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
ByteArrayInputStream bIn = new ByteArrayInputStream(input);
CipherInputStream cIn = new CipherInputStream(bIn, cipher);
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
int ch;
while ((ch = cIn.read()) >= 0) {
bOut.write(ch);
}
byte[] cipherText = bOut.toByteArray();
System.out.println("cipher: " + new String(cipherText));
// decryption pass
cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
bOut = new ByteArrayOutputStream();
CipherOutputStream cOut = new CipherOutputStream(bOut, cipher);
cOut.write(cipherText);
cOut.close();
System.out.println("plain : " + new String(bOut.toByteArray()));
}
}

</source>



== DES Crypter And Decryper File ==



<source lang="java">
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.Security;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
public class MainClass {
static Cipher m_encrypter;
static Cipher m_decrypter;
public static void main(String args[]) throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
SecretKey key = KeyGenerator.getInstance("DES").generateKey();
// for CBC; must be 8 bytes
byte[] initVector = new byte[] { 0x10, 0x10, 0x01, 0x04, 0x01, 0x01, 0x01, 0x02 };
AlgorithmParameterSpec algParamSpec = new IvParameterSpec(initVector);
Cipher m_encrypter = Cipher.getInstance("DES/CBC/PKCS5Padding");
Cipher m_decrypter = Cipher.getInstance("DES/CBC/PKCS5Padding");
m_encrypter.init(Cipher.ENCRYPT_MODE, key, algParamSpec);
m_decrypter.init(Cipher.DECRYPT_MODE, key, algParamSpec);
FileInputStream fis = new FileInputStream("cipherTest.in");
FileOutputStream fos = new FileOutputStream("cipherTest.out");
int dataInputSize = fis.available();
byte[] inputBytes = new byte[dataInputSize];
fis.read(inputBytes);
write(inputBytes, fos);
fos.flush();
fis.close();
fos.close();
String inputFileAsString = new String(inputBytes);
System.out.println("INPUT FILE CONTENTS\n" + inputFileAsString + "\n");
System.out.println("File encrypted and saved to disk\n");
fis = new FileInputStream("cipherTest.out");
byte[] decrypted = new byte[dataInputSize];
read(decrypted, fis);
fis.close();
String decryptedAsString = new String(decrypted);
System.out.println("DECRYPTED FILE:\n" + decryptedAsString + "\n");
}
public static void write(byte[] bytes, OutputStream out) throws Exception {
CipherOutputStream cos = new CipherOutputStream(out, m_encrypter);
cos.write(bytes, 0, bytes.length);
cos.close();
}
public static void read(byte[] bytes, InputStream in) throws Exception {
CipherInputStream cis = new CipherInputStream(in, m_decrypter);
int pos = 0, intValue;
while ((intValue = cis.read()) != -1) {
bytes[pos] = (byte) intValue;
pos++;
}
}
}

</source>

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Admin: 1 версия

в 18:01, 31 мая 2010