0a5ca2422f
The current code, introduced in CL 2422, mixes K bits of entropy with the private key and message digest to generate the signature nonce, where K is half the bit size of the curve. While the ECDLP complexity (and hence security level) of a curve is half its bit size, the birthday bound on K bits is only K/2. For P-224, this means we should expect a collision after 2^56 signatures over the same message with the same key. A collision, which is unlikely, would still not be a major practical concern, because the scheme would fall back to a secure deterministic signature scheme, and simply leak the fact that the two signed messages are the same (which is presumably already public). Still, we can simplify the code and remove the eventuality by always drawing 256 bits of entropy. Change-Id: I58097bd3cfc9283503e38751c924c53d271af92b Reviewed-on: https://go-review.googlesource.com/c/go/+/352530 Trust: Filippo Valsorda <filippo@golang.org> Run-TryBot: Filippo Valsorda <filippo@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Roland Shoemaker <roland@golang.org> |
||
|---|---|---|
| .github | ||
| api | ||
| doc | ||
| lib/time | ||
| misc | ||
| src | ||
| test | ||
| .gitattributes | ||
| .gitignore | ||
| AUTHORS | ||
| codereview.cfg | ||
| CONTRIBUTING.md | ||
| CONTRIBUTORS | ||
| LICENSE | ||
| PATENTS | ||
| README.md | ||
| SECURITY.md | ||
The Go Programming Language
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.
Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.
Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
Download and Install
Binary Distributions
Official binary distributions are available at https://golang.org/dl/.
After downloading a binary release, visit https://golang.org/doc/install for installation instructions.
Install From Source
If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source for source installation instructions.
Contributing
Go is the work of thousands of contributors. We appreciate your help!
To contribute, please read the contribution guidelines at https://golang.org/doc/contribute.
Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.