Hi,
the NIST Recommendation SP 800-38G document specify that the parameters minLenght and maxLength can be equals, but in your implementation it's required to be 2 distinct values.
Am i wrong?

Description

[Make check method in FormatPreservingEncryption protected]

Why is this needed?

[If the check method was protected I could extend the class and add some additional checks for example maybe based on regular expressions on a need basis]

Additional Information

[Since the class is not marked as final I assume there is no harm in allowing this. Do pls note new to this project. In case there is another way to achieve this please advise. Thanks]

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Checked that your issue isn't already filled: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aidealista
  • Checked that there is not already provided the described functionality

Description

I have successfully used the library to Encrypt and Decrypt values. See below;

Raw Value=1234567890123456, Encrypted=5959499404198841, Decrypted=1234567890123456
Raw Value=MNEMONIC, Encrypted= XXZI9ob, Decrypted=MNEMONIC
Raw Value=SOMEVALU, Encrypted=TC6WQj21, Decrypted=SOMEVALU
Raw Value=SOM, Encrypted=qVI, Decrypted=SOM
Raw Value=SOME, Encrypted=mJry, Decrypted=SOME
Raw Value=SOMEV, Encrypted=j4b4f, Decrypted=SOMEV

As you can see my requirement is that user would be storing the encrypted values in thier database and they would want to search on these encrypted values using LIKE '%' but this won't work because it generates different value depending on the length of the string. Is there anyway I can restrict the library to generate the value to be as follows;

Raw Value=SOMEVALU, Encrypted=TC6WQj21, Decrypted=SOMEVALU
Raw Value=SOM, Encrypted=TC6, Decrypted=SOM
Raw Value=SOME, Encrypted=TC6W, Decrypted=SOME
Raw Value=SOMEV, Encrypted=TC6WQ, Decrypted=SOMEV

Or am I missing the whole point?

Versions

1.0.0

Description

Implement FF3 Algorithm specified in NIST SP 800-38G documentation available at https://csrc.nist.gov/publications/detail/sp/800-38g/final

Why is this needed?

FF3Algorithm class and Builder method change to create and use FF3Algorithm

On Feb. 2019, NIST published SP 800-38G Rev. 1, which requires domain size for FF1 to be at least 1 million, whereas currently is 100.

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Checked that your issue isn't already filled: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aidealista
  • Checked that there is not already provided the described functionality

Description

Add Maven Wrapper (https://github.com/takari/maven-wrapper) to integrate Maven and avoid the need to have and specific version of Maven installed

Expected behavior:

Execute Maven goals using the embedded Maven Wrapper:

$ ./mvnw test

Actual behavior:

Actually requires an external installation of Maven with a specific version (Maven 3.3.3 or higher).

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Checked that your issue isn't already filled: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aidealista
  • Checked that there is not already provided the described functionality

Description

I got a null pointer exception when sample usage testing

Steps to Reproduce

1. Add this project library to maven dependency
2. Ran the below code
   // with default values
   FormatPreservingEncryption formatPreservingEncryption = FormatPreservingEncryptionBuilder
   .ff1Implementation()
   .withDefaultDomain()
   .withDefaultPseudoRandomFunction("laki".getBytes())
   .withDefaultLengthRange()
   .build();

//usage
String cipherText = formatPreservingEncryption.encrypt("12121", "mytweak".getBytes());
String plainText = formatPreservingEncryption.decrypt(cipherText, "mytweak".getBytes());

    System.out.println(cipherText);
    System.out.println(plainText);

Expected behavior:
Should print cipher text and plain text
Actual behavior:

got a null pointer exception

Exception in thread "main" java.lang.NullPointerException
at com.idealista.fpe.config.GenericTransformations.transform(GenericTransformations.java:37)
at com.idealista.fpe.config.GenericDomain.transform(GenericDomain.java:25)
at com.idealista.fpe.FormatPreservingEncryption.encrypt(FormatPreservingEncryption.java:28)
at experiment.EncryptionTest.main(EncryptionTest.java:81)

Reproduces how often:
100%

Versions

1.0.0