What happens if i fail the chacha test

ChaCha 3 is interesting in that it is somewhere in between. As the results in the footnotes show, ChaCha 3 is an intermediate case. The full crush battery however does find problems.

The decisive failure of the Fourier tests is understandable: low-quality generators often fail spectral tests. But the results of the simple poker test are harder to understand. What is it about simulating poker that makes ChaCha 3 fail spectacularly? And in both cases, one more round of ChaCha fixes the problems.

Passes TestU01 small crush but fails full crush:. Your email address will not be published. What a difference one round makes One thing I find interesting about random number generation and block encryption is that a single round of obfuscation can make a huge difference. Interesting failures Often random number generators are either good or bad; they pass the standard test suites or they clearly fail.

It passed PractRand using up to GB. Asked 6 years, 1 month ago. Active 2 years, 1 month ago. Viewed 4k times. Improve this question. Kar Kar 5, 6 6 gold badges 48 48 silver badges 80 80 bronze badges. Have you had a look at the examples package? And you do not use java's standard crypto API? ChaCha20 is a stream cipher, and Poly is a mac designed to be used in conjunction with bit block ciphers. Yes, if you know what you're doing you can pretend that a stream cipher is block cipher for the purposes of TLS.

However, bouncycastle doesn't really support the combination except in the special case of TLS. No, that's not what that means. It means you'll have to write more code than you would with other cipher and mac combinations. Add a comment. Active Oldest Votes. So you can also use: Security. Improve this answer. Maarten Bodewes Maarten Bodewes Caused by: java. Did you forget to add the provider as in above? Because this does not fail with an earlier version of BouncyCastle 1.

A4L A4L A4L you shared code for fileEncryption while I need simple string encryption using chacha Although thanks for your feedback — Zar E Ahmer. A4L thanks a lot for your help. It is running fine. I just change StandardCharsets. And also changes SecureRandome. A4L , I want to know. Can I use my own key in your code. Or it can be done without them. See my question stackoverflow.

Nepster Ofcourse you can use any key you want, just make sure it is of the required length i. Show 1 more comment. IvParameterSpec; import javax. SecretKeySpec; import java. InvalidAlgorithmParameterException; import java.