scrypt & PBKDF2-HMAC-SHA256

General
1

Ok. It has been a long time since I tried to code/program security/encryption/hashing algorithms. So please bare with me.

I need to have the scrypt funtion. Xojo’s crypto module doesnt support it natively. Which is fine as it is PBKDF2-HMAC-SHA256 based. Yeah my eyes got big when I read that to. I know what each of those items are when they are seperate but I am not sure what it means together. So lots of googling/binging/yahooing and I came up with this page. http://crypto.stackexchange.com/questions/8634/how-does-scrypt-use-salsa

it says that scrypt is:

Steps:

 1. B[0] = PBKDF2-HMAC-SHA256 (P, S, 1, 128 * r)

 2. B[0] = scryptROMix (r, B[0], N)

 3. DK = PBKDF2-HMAC-SHA256 (P, B[0], 1, dkLen)

If I can figure out what it meant by PBKDF2-HMAC-SHA256 then the rest should be easy (easier?).

Any suggestions, comments, concerns, help, advice, anything is gratefully accepted.

sb

2

I’d expect that to be the Crypto.PBKDF2 function with the SHA256 algorithm.

3

has anyone any test material for scrypt() function? something that is before scrypt and after. I cant find anything online and if I am going to write the functionality, I need to test to make sure I am generating the write outcome

I am finding more and more than I need the scrypt() function and cant work around it anymore.

4

Take a look at the tests I wrote for Bcrypt in my Blowfish project. I used PHP to hash a string and my code to validate it, and vice-versa. Perhaps you can do something like that?

https://github.com/ktekinay/Blowfish

5

[quote=305425:@Kem Tekinay]Take a look at the tests I wrote for Bcrypt in my Blowfish project. I used PHP to hash a string and my code to validate it, and vice-versa. Perhaps you can do something like that?

https://github.com/ktekinay/Blowfish[/quote]

thanks I will.

6

FYI, I just included Scrypt in the last update to my M_Crypto module.

https://github.com/ktekinay/M_Crypto

7

[quote=352918:@Kem Tekinay]FYI, I just included Scrypt in the last update to my M_Crypto module.

https://github.com/ktekinay/M_Crypto[/quote]

I saw! thanks!!