ECDSA

Ivan83
Joined:: 2013-11-27
Posts:: 5
Location:: Russia, Moscow

ECDSA – I can help with code

2013-11-27 12:54

Hi!

I wrote the code to work with ECDSA.
BSD License.
ECDSA can help with your project.

Ivan83
Joined:: 2013-11-27
Posts:: 5
Location:: Russia, Moscow

2013-11-28 08:52

#include "ec.h"
 
...
 
size_t rsize;
uint8_t rnd[70], priv_key[70], pub_key_x[70], pub_key_y[70], sign_r[70], sign_s[70];
ec_curve_t curve;
/*  SHA-1("abc") = "a9993e364706816aba3e25717850c26c9cd0d89d" */ uint8_t hash_abc[20] = {0xa9, 0x99, 0x3e, 0x36, 0x47, 0x06, 0x81, 0x6a, 0xba, 0x3e, 0x25, 0x71, 0x78, 0x50, 0xc2, 0x6c, 0x9c, 0xd0, 0xd8, 0x9d};
 
/* Get curve params by name. */
if (0 != ec_curve_from_str(ec_curve_str_get_by_name((uint8_t*)"secp192r1", 9), &curve))
   return (-1);
 
/* Generating keys. */
memset(rnd, 173, sizeof(rnd));/* XXX rand!!! */
if (0 != ec_key_gen(rnd, sizeof(rnd), &curve, priv_key, pub_key_x, pub_key_y, &rsize))
   return (-1); /* Error! */
 
/* Sign */
memset(rnd, 73, sizeof(rnd));/* XXX rand!!! */
if (0 != ec_sign((uint8_t*)hash_abc, 20, priv_key, rsize, rnd, sizeof(rnd), &curve, sign_r, sign_s, &rsize))
   return (-1); /* Error! */
 
/* Verify */
if (0 != ec_verify(&curve, pub_key_x, pub_key_y, rsize, (uint8_t*)hash_abc, 20, sign_r, sign_s, rsize))
   return (-1); /* Error! */

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martin◆ Site Admin
Joined:: 2002-12-10
Posts:: 42,196
Location:: Prague, Czechia

Re: ECDSA - i can help with code

2013-11-28

Thanks for sharing your code. Could you contact PuTTY team and offer them help integrating this to PuTTY codebase?
https://www.chiark.greenend.org.uk/~sgtatham/putty/feedback.html

We will takeover the implementation then. Thanks.

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Ivan83

2013-11-28 16:35

Already written them: putty@projects.tartarus.org
They expect to see a patch for the PuTTY, but I do not want to learn SSH protocol.

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martin◆ Site Admin

2013-12-02

Ok, I see. Thanks for trying.

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Gatak Guest

2014-01-07 14:03

I read there is a growing concern about elliptic-curve cryptography and that the curves in the current standards have been "influenced" by NSA – to what end we can only guess.

Unless you are thinking of Curve25519, it may be wise to be conservative and stick to RSA with high bit encryption.
ref: https://git.libssh.org/projects/libssh.git/tree/doc/curve25519-sha256@libssh.org.txt

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Ivan83
Joined:: 2013-11-27
Posts:: 5
Location:: Russia, Moscow

2014-01-07 18:57

There are many different parameters of elliptic curves.
Some appeared in the work in 1998.
There are parameters of elliptic curves generated not in the United States .
There are Russian version where in the formulas are slightly different coefficients and parameters of their curves.
All formulas and algorithms have long existed and analyzing it is described how to generate the most options for elliptic curves.
However, 25519 appeared not long ago, the formula calculations there several others, and I have not seen this work on cryptanalysis "works of art". And almost all implementations in assembler.
So if anyone does not believe it is 25519. This is my personal opinion.

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Guest

2014-01-07 19:30

Sure, but are these (Russian and other) alternatives available in OpenSSH, OpenSSL or GnuTLS?

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Ivan83

2014-01-07 20:16

Brainpool, GOST in OpenSSL.

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Baebeca Guest

Re: ECDSA - i can help with code

2015-03-13 10:34

@martin
PuTTY has released full SSH2-ECDSA support in there current nightly snapshot. (https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html)

I can't find SSH2-ECDSA support in your current version or in your project roadmap.
Is there any status to SSH2-ECDSA support?

Thanks so far!

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martin◆ Site Admin

Re: ECDSA - i can help with code

2015-03-16

@Baebeca: I'll look into it.
But note they deliberately did not include ECDSA into recent PuTTY 0.64 release. I'm sure there's a reason for that.

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Baebeca
Joined:: 2015-03-16
Posts:: 4
Location:: Germany

Re: ECDSA - i can help with code

2015-03-16 11:00

martin wrote:

I'll look into it.

Thanks!

martin wrote:

not include ECDSA into recent PuTTY 0.64 release. I'm sure there's a reason for that.

Yes, 0.65 are still in Test – ECDSA will be included in the next release

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synapt Guest

2015-06-03 03:01

With PuTTY having this in snapshots quite a few months now and PuTTYgen even having a .ppk export option in what I assume they figure would be the proper import model for an ECDSA key, is there any chance of this actually being implemented soon in WinSCP or is there still a wait for it to come out in a 'Stable' PuTTY release?

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martin◆ Site Admin

2015-06-05

Will check it. But in general I prefer waiting for a stable release.

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synapt Guest

2015-06-06 08:46

@martin: I don't blame you, but PuTTY is pretty slow for new releases (0.64 came two years after 0.63, and that one two years after 0.62, possible 0.65 might be soon-ish with the ECDSA though I guess), though worth noting by all intents even 0.64 despite being the latest "stable" release is still technically a beta :P

But yeah it'd be cool to see some support for it if possible, so far I've had no issues with them in PuTTY alone across multiple distros so at the very least puttygen is creating the general details properly, I'd assume getting the .ppk it generates working in WinSCP wouldn't be too horrible?

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Baebeca

2015-06-09 14:10

I agree – the PuTTY BETAs are a Long time stable versions ;)

I have no problems with the current PuTTY beta version.

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Synapt Guest

2015-12-02 07:33

Any update on this? A fast glance at recent releases doesn't show anything.

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martin◆ Site Admin

2015-12-03

@Synapt: There's still no PuTTY release with ECDSA support.

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dqdt
Joined:: 2016-01-06
Posts:: 2

2016-01-06 20:25

@martin: That's really a pity. Fortunately FileZilla is supporting ECDSA so I had to switch to it. It is really a shame that several SSH/SFTP-app-providers wait that long implementing that badly needed (for instance for embedded devices) ECDSA support.

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martin◆ Site Admin
Joined:: 2002-12-10
Posts:: 42,196
Location:: Prague, Czechia

Re: ECDSA - i can help with code

2016-01-13

This request has been added to the tracker:
Issue 1390 – Support for ECDSA keys

I'm sending you an email with a development version of WinSCP to the address you have used to register on this forum.

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