EncodeDecode_Java

Brief

This reposity includes encrption(md5, sha-*) and decrpytion. Simple few lines code. Do it as simple as I can.

Features

The code is small, and easy to understand. You won't get too long to understand it.

Also, it is easy to customize, especially getSHA()

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EncodeOneway.java

GENERAL

This source file includes only two functions. They are as followed:

//This function will give you a 16-bit or 32-bit md5
public String getMD5(int bits, String plainText, Boolean LetterCase) {
   ...
}

//This function can give you sha1, sha224, sha256, sha384 and sha512
public String getSHA(int algorithmOption, String plainText, Boolean LetterCase){
    ...
}

Parameter Explantion

getMD5()

1. int bits:

    '16' ==> 'generate 16bits hash'
    '32' ==> 'generate 32bits hash'
   

2. String plainText:

    just something you want to encode
   

3. Boolean LetterCase:

    'false' ==> 'Lowercase'
    'true' ==> 'Uppercase'
   

getSHA()

1. int algorithmOption:

   • Value:

       '0' ==> 'SHA-1'
       '1' ==> 'SHA-224'
       '2' ==> 'SHA-256'
       '3' ==> 'SHA-384'
       '4' ==> 'SHA-512'
     

   • How does it work Inside getSHA(), there's a String array:

     	String[] algorithm = {
         		"SHA-1", "SHA-224", 
                 "SHA-256", "SHA-384", "SHA-512"
         };

     If you want to encode with SHA-1, just use

     MessageDigest messageDigest = MessageDigest.getInstance(algorithm[algorithmOption]);

     That's how it works.

2. String plainText:

    just something you want to encode
   

3. Boolean LetterCase:

    'false' ==> 'Lowercase'
    'true' ==> 'Uppercase'
   

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EncodeReversible.java

GENERAL

In EncodeReversible.java, there's only two functions. They are as followd:

//This stupid function will give you Base64(Encoding)
public String getBase64(String plainText){
	...
}


//This stupid function will give you URL-encoded String/Text
public String getURLEncoded(String plainText){
	...
}

Something else

1. About using java.util.Base64

    I use newest `java.util.Base64`. Because it is faster than `com.sum.misc` and `org.apache.commons.codec.binary`. I recommend you to use this too.
   

2. Reference

    https://magiclen.org/java-base64/
   
    PS： I hope you understand traditonal Chinese. Otherwise, don't look at it.
   

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Decode.java

GENERAL

In this damn source file, you can only find two functions AGAIN.

//This can decode damn Base64 value into human-readable string
public String reverseBase64(String cipherText) {
	...
}


//This can decode encoded version of URL
public String reverseURLEncode(String urlEncodedText){
	...
}

---

Author

Gabriel

Bugs && Feedback

If you find something strange, you can write in here