Bitwise operations on secret key

[gjedeer]

I'm wondering what's the reason why there are bit-wise operations on the secret key in generatePrivateKey():

https://github.com/tgalal/python-axolotl-curve25519/blame/e4a9c4de0eae27223200579c58d1f8f6d20637e2/curve25519module.c#L98

I've been trying to find something similar in the reference 25519 implementation by Bernstein and I could not. Care to point me in the right direction?

[Vinc0682]

These operations are specified on Bernstein's official homepage: https://cr.yp.to/ecdh.html

[gjedeer]

I see, he just used a precomputed secret key that's why these operations were already performed. Thanks @Vinc0682