Module org.arakhne.afc.core.text

Package org.arakhne.afc.text

Class Encryption

java.lang.Object

org.arakhne.afc.text.Encryption

public final class Encryption
extends Object

Tools for encryption.

Theoretically, MD5 and SHA1 are algorithms for computing a 'condensed representation' of a message or a data file. The 'condensed representation' is of fixed length and is known as a 'message digest' or 'fingerprint'.

In both cases of MD5 and SHA, the fingerprint (message digest) is also non-reversable.... your data cannot be retrieved from the message digest, yet as stated earlier, the digest uniquely identifies the data.

Since:

14.0

Version:

17.0 2020-01-04 14:41:39

Author:

Stéphane GALLAND

Maven Group Id:

org.arakhne.afc.core

Maven Artifact Id:

text

Method Summary

Modifier and Type	Method	Description
static byte[]	decrypt(byte[] str)	Decrypt the specified string according to the given key.
static byte[]	decrypt(byte[] str, Key decrypting_key)	Decrypt the specified string according to the given key.
static byte[]	decrypt(byte[] str, Key decrypting_key, String algorithm)	Decrypt the specified string according to the given key.
static String	decrypt(String str)	Decrypt the specified string according to the given key.
static String	decrypt(String str, Key decrypting_key)	Decrypt the specified string according to the given key.
static byte[]	encrypt(byte[] str)	Encrypt the specified string according to the given key.
static byte[]	encrypt(byte[] str, Key encrypting_key)	Encrypt the specified string according to the given key.
static byte[]	encrypt(byte[] str, Key encrypting_key, String algorithm)	Encrypt the specified string according to the given key.
static String	encrypt(String str)	Encrypt the specified string according to the given key.
static String	encrypt(String str, Key encrypting_key)	Encrypt the specified string according to the given key.
static void	loadDefaultEncryptionModule()	Load the default encryption module.
static String	md5(String str)	Replies a MD5 key.
static String	sha(String str)	Replies a SHA key.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

loadDefaultEncryptionModule

public static void loadDefaultEncryptionModule()

Load the default encryption module.

By default this is the SunJCE module.

md5

public static String md5(String str)

Replies a MD5 key.

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.

The fingerprint (message digest) is non-reversable.... your data cannot be retrieved from the message digest, yet as stated earlier, the digest uniquely identifies the data.

Parameters:

str - is the string to encrypt.

Returns:

the MD5 encryption of the string str

sha

public static String sha(String str)

Replies a SHA key.

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.

The fingerprint (message digest) is non-reversable.... your data cannot be retrieved from the message digest, yet as stated earlier, the digest uniquely identifies the data.

Parameters:

str - is the string to encrypt.

Returns:

the SHA encryption of the string str

encrypt

public static String encrypt(String str)

Encrypt the specified string according to the given key.

Caution: this function use some Sun's JDK classes.

The DES algorithm is used.

Parameters:

str - is the string to encrypt

Returns:

the encryption result

encrypt

public static String encrypt(String str,
                             Key encrypting_key)

Encrypt the specified string according to the given key.

Caution: this function use some Sun's JDK classes.

The DES algorithm is used.

Parameters:

str - is the string to encrypt

encrypting_key - is the key used for encryption.

Returns:

the encryption result or the empty string

encrypt

public static byte[] encrypt(byte[] str)

Encrypt the specified string according to the given key.

Caution: this function use some Sun's JDK classes.

The DES algorithm is used.

Parameters:

str - is the string to encrypt

Returns:

the encryption result

encrypt

public static byte[] encrypt(byte[] str,
                             Key encrypting_key)

Encrypt the specified string according to the given key.

Caution: this function use some Sun's JDK classes.

The DES algorithm is used.

Parameters:

str - is the string to encrypt

encrypting_key - is the key used for encryption.

Returns:

the encryption result or the empty string

encrypt

public static byte[] encrypt(byte[] str,
                             Key encrypting_key,
                             String algorithm)

Encrypt the specified string according to the given key.

Caution: this function use some Sun's JDK classes.

The DES algorithm is used.

Parameters:

str - is the string to encrypt

encrypting_key - is the key used for encryption.

algorithm - is the name of the encryption algorithm.

Returns:

the encryption result or the empty string

decrypt

public static String decrypt(String str)

Decrypt the specified string according to the given key.

Caution: this function use some Sun's JDK classes.

The DES algorithm is used.

Parameters:

str - is the string to decrypt

Returns:

the decryption result

decrypt

public static String decrypt(String str,
                             Key decrypting_key)

Decrypt the specified string according to the given key.

Caution: this function use some Sun's JDK classes.

The DES algorithm is used.

Parameters:

str - is the string to decrypt

decrypting_key - is the key used for decryption.

Returns:

the decryption result or the empty string

decrypt

public static byte[] decrypt(byte[] str)

Decrypt the specified string according to the given key.

Caution: this function use some Sun's JDK classes.

The DES algorithm is used.

Parameters:

str - is the string to decrypt

Returns:

the decryption result

decrypt

public static byte[] decrypt(byte[] str,
                             Key decrypting_key)

Decrypt the specified string according to the given key.

Caution: this function use some Sun's JDK classes.

The DES algorithm is used.

Parameters:

str - is the string to decrypt

decrypting_key - is the key used for decryption.

Returns:

the decryption result or the empty string

decrypt

public static byte[] decrypt(byte[] str,
                             Key decrypting_key,
                             String algorithm)

Decrypt the specified string according to the given key.

Caution: this function use some Sun's JDK classes.

The DES algorithm is used.

Parameters:

str - is the string to decrypt

decrypting_key - is the key used for decryption.

algorithm - is the name of the decryption algorithm

Returns:

the decryption result or the empty string