[Cryptography-dev] nacl.hashlib.scrypt not working with Nscrypt(n)=32768

[Paul Kehrer]

You are passing a maxmem of 2**25, which is 33554432 bytes. Setting
n=32768, r=8, p=16 causes it to compute a Blen = p * 128 * r = 16384 and a
Vlen = 32 * r * (n + 2) * 4 = 33556480. 33556480 + 16384 = 33572864. Since
that is larger than 2**25 it fails. Raise the maxmem limit and this failure
will go away.

-Paul

On Thu, May 21, 2020 at 9:22 PM JHENUKUMAR SUBRAMANIAM <jhenukumar at geely.com>
wrote:

> Dear  Pynacl Developers,
>
>
>
> Set-up details
>
> Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 23:03:10) [MSC v.1916 64
> bit (AMD64)]
>
> Library ::: pynacl (1.14.0)
>
> Operating System ::: Windows 10 Enterprise Build 16.299
>
> Processor ::: Intel(R) Core(TM) i5-7200U CPU @ 2.50GHz, 2712 Mhz, 2
> Core(s), 4 Logical Processor(s)
>
> Installed Physical Memory (RAM)::: 16.0 GB
>
> Graphics :::: NVIDIA Geforce 930MX
>
>
>
> Running this command
>
> *import* nacl*.*hashlib
>
> z *=* nacl*.*hashlib*.*scrypt*(*b'passphrase'*,*salt*=*b'mysalt'*,*n*=*
> 32768*,*r *=*8*,*p*=*16*,*maxmem*=*2****25*,*dklen*=*64*)*
>
> *#If I chose n = 2**14 it works, but n= 32768 doesn’t work. How to fix it**
> ?*
>
>
>
> Error Window:::
>
>
>
> [image: cid:image001.jpg at 01D573A6.35DA4500]
>
> *苏杰**JHENU KUMAR SUBRAMANIAM*
>
> 主任工程师Senior Engineer
>
> *路特斯工程**(**中国**) Lotus Engineering China*
>
> M: +86 130 6585 7869 | E: jhenukumar at geely.com
>
> No.918, Binhai 4th Rd, Hangzhou Bay New District, Ningbo, Zhejiang, P. R.
> China, 315336
>
> 浙江省宁波市杭州湾新区滨海四路918号   邮编：315336
>
>
>
>
>
>
> 免责声明：本邮件所包含信息发给指定个人或机构，邮件可能包含保密或专属信息。未经接收者许可，不得阅读、转发或传播邮件内容，或根据邮件内容采取任何相关行动。如果错误地收到了此邮件，请与收件人联系并自行删除邮件内容。
>
> Disclaimer：The information transmitted is intended only for the person or
> entity to which it is addressed and may contain confidential and/or
> privileged material. Any review, retransmission, dissemination or other use
> of, or taking of any action in reliance upon, this information by persons
> or entities other than the intended recipient is prohibited. If you
> received this in error , please contact the sender and delete the material
> from any computer .
> _______________________________________________
> Cryptography-dev mailing list
> Cryptography-dev at python.org
> https://mail.python.org/mailman/listinfo/cryptography-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/cryptography-dev/attachments/20200522/f8b78fbc/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image004.jpg
Type: image/jpeg
Size: 83952 bytes
Desc: not available
URL: <http://mail.python.org/pipermail/cryptography-dev/attachments/20200522/f8b78fbc/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image005.jpg
Type: image/jpeg
Size: 4471 bytes
Desc: not available
URL: <http://mail.python.org/pipermail/cryptography-dev/attachments/20200522/f8b78fbc/attachment-0003.jpg>