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Merged
merged 13 commits into from
Jun 17, 2014
Merged

Signatures #2

merged 13 commits into from
Jun 17, 2014

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@dchest
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@dchest dchest commented Jun 14, 2014

Changes from https://github.com/devi/tweetnacl-js/tree/sha512 + new tests for signatures.
Signature test signs a random message in JS, then signs the same message with a C program using the latest tweetnacl.c, then compares the result and tries to open it.

To run sign test,

 cd tests
 make test

Currently sign test doesn't pass fully, e.g.:

Test #28 (Message length: 40)
sign - OK
open - OK

Test #29 (Message length: 40)
! signatures don't match
JS:  AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAg5/uin4OUr0A3BGf1d6EjsjCeR4mWMOULHTUBe6hEAA== 
C :  0/NJ+frDasaDY8Y1PH/MPQRCvS/bMND9z/GwYOCOJKZ4q1C8/IWjhVNqguenzXuWahVePtrjMQZVjldDqeyUBw==
open - OK

Test #30 (Message length: 40)
sign - OK
open - OK

Test #31 (Message length: 44)
sign - OK
open - OK

Test #32 (Message length: 44)
sign - OK
open - OK

Test #33 (Message length: 44)
sign - OK
open - OK

Test #34 (Message length: 48)
! signatures don't match
JS:  VFrc0cgwtkAED6wgjrGtzYGlWhR+53f8sfzYGLiuP5PZLrCs/S9YWe/d5F4HJ+3BEuGIsaC8YgfAW0jcba3RAA== 
C :  VFrc0cgwtkAED6wgjrGtzYGlWhR+53f8sfzYGLiuP5OZ5spi8J982VDamORfRRiSOfC3/dOGZkcCbFSmVmCpAw==
! verification failed

@dchest dchest mentioned this pull request Jun 14, 2014
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@devi
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devi commented Jun 16, 2014

I've found most of the culprit, need more test on other environment, should I create a new pull ?

@dchest
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dchest commented Jun 16, 2014

@devi thanks! I'm testing it right now. No need for a new PR, I'll just pull directly from you.

@dchest
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dchest commented Jun 16, 2014

Right now only one of the 40-byte messages fail:

Test #29 (Message length: 40)
! signatures don't match
JS:  AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAARCiQVUm8YtmjAwBqRm38I3/i/J8DDiF+4aw+6G4tECA== 
C :  ZUPAU8yIRM4Fzs3dizDYBzqzILi2HUixBXel9KtvB25679DwhECjDd+z9sgXC/Nd/EooOhGlkwOwQMeRVSxiCQ==

(AAAA... is zeros in base64)

(I'm using this version: https://github.com/devi/tweetnacl-js/commit/f9a72ffa3708c89c6574a13ae21bba1a709e18ec)

@dchest
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dchest commented Jun 16, 2014

I've replaced a random message with repeats of "x" like this in tests/sign.js check():

-var msg = crypto.randomBytes(i).toString('base64');
+var msg = new Array(i).join('x');

and it fails when length is 28:

Test #29 (Message length: 28)
! signatures don't match
JS:  AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACtTzhlkbOYaklFGb2EKe5nmHd+NjpYO+B/JLZqgIAABQ== 
C :  scWbBbC8PefhsB0gXRW6LcGDZNdOjZcr1peVoimzZFryO6fyDtvbzn89xJN0xnItcPg2dsbiU+zaSk+p6MunDw==

Do you think it's crypto_hash's or crypto_sign's fault? I should probably create a crypto_hash test like sign.js.

@dchest
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dchest commented Jun 16, 2014

Added hash test:

make test_hash

It passes, so it looks like SHA-512 implementation is OK.

@devi
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devi commented Jun 16, 2014

@dchest Sorry I didn't saw your 22360c7 commit.
I've pushed another test to my sha512 branch.
It looks like sign test passes 28 bytes bugs.

@dchest
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dchest commented Jun 16, 2014

@devi Awesome! I've tried and it runs 100 sign tests successfully. I'll let it run with random strings for a few hours to be sure, then go through the code again, and then merge (not sure if I'll have time today, so give me a few days :). Thanks again for the great work! 👍

@devi
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devi commented Jun 16, 2014

@dchest Thanks to you! You've teached me a lot from this pull.

dchest added 10 commits June 17, 2014 10:11
@dchest
Nits found by jshint.
ac75049
@dchest
Use for loops everywhere tweetnacl.c uses FOR for consistency and ease
04b0812 
of review.
@dchest
Reorganize signature code; make test fail again.
604d859 
* Reordered functions so that they appear in order similar to
  tweetnacl.c.

* Replaced while loops with for loops to match tweenacl.c.

* In pack25519, change t from empty array to new gf() -- which makes the
  test fail again on 29-byte messages unless we observe n or t with
  console.log. This needs investigation.
@dchest
Use hex numbers as in tweetnacl.c.
438ce27
@dchest
Add signature test vector.
8596730
@dchest
Use 'exit' instead of 'close' for child process.
54cef3a
@dchest
Workaround for potential Node bug (see Issue 5).
192e7cb
@dchest
Switch back to 'close' event of child process.
f406db9
@dchest
Back to testing random strings instead of 'xxxx..'
e2bca59
@dchest
Add chash to .gitignore.
242388c
@dchest dchest merged commit 242388c into master Jun 17, 2014
@dchest
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dchest commented Jun 17, 2014

All right, I merged it! Thanks again.

Also, I think one of the test failures was caused by a Node bug: #5

@dchest dchest deleted the sign branch June 17, 2014 19:27
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3 participants

@dchest @devi