Add x25519 gem, support Curve25519

[HLFH]

Fixes:

  ERROR (Net::SSH::Exception): Exception while executing on host example.com: could not settle on kex algorithm
Server kex preferences: [email protected],ext-info-s,[email protected]
Client kex preferences: ecdh-sha2-nistp521,ecdh-sha2-nistp384,ecdh-sha2-nistp256,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1

[kobaltz]

I think that there could be an issue with this gem on amd64 docker images using Ruby:3.3.4-slim

10.76 Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
10.76
10.76 current directory:
10.76 /usr/local/bundle/gems/x25519-1.0.10/ext/x25519_precomputed
10.76 /usr/local/bin/ruby extconf.rb
10.76 creating Makefile
10.76
10.76 current directory: /usr/local/bundle/gems/x25519-1.0.10/ext/x25519_precomputed
10.76 make DESTDIR\= sitearchdir\=./.gem.20240709-8-s8aykj
10.76 sitelibdir\=./.gem.20240709-8-s8aykj clean
10.76
10.76 current directory: /usr/local/bundle/gems/x25519-1.0.10/ext/x25519_precomputed
10.76 make DESTDIR\= sitearchdir\=./.gem.20240709-8-s8aykj
10.76 sitelibdir\=./.gem.20240709-8-s8aykj
10.76 compiling cputest.c
10.76 cputest.c: In function ‘check_xcr0_ymm’:
10.76 cputest.c:28:12: warning: old-style function definition [-Wold-style-definition]
10.76    28 | static int check_xcr0_ymm()
10.76       |            ^~~~~~~~~~~~~~
10.76 cputest.c: In function ‘check_4th_gen_intel_core_features’:
10.76 cputest.c:39:5: warning: old-style function definition [-Wold-style-definition]
10.76    39 | int check_4th_gen_intel_core_features()
10.76       |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10.76 At top level:
10.76 cc1: note: unrecognized command-line option ‘-Wno-self-assign’ may have been
10.76 intended to silence earlier diagnostics
10.76 cc1: note: unrecognized command-line option ‘-Wno-parentheses-equality’ may have
10.76 been intended to silence earlier diagnostics
10.76 cc1: note: unrecognized command-line option ‘-Wno-constant-logical-operand’ may
10.76 have been intended to silence earlier diagnostics
10.76 compiling fp25519_x64.c
10.76 fp25519_x64.c: In function ‘mul2_256x256_integer_x64’:
10.76 fp25519_x64.c:112:3: error: the register ‘%r13’ cannot be clobbered in ‘asm’ for
10.76 the current target
10.76   112 |   __asm__ __volatile__(
10.76       |   ^~~~~~~
10.76 fp25519_x64.c: In function ‘sqr2_256x256_integer_x64’:
10.76 fp25519_x64.c:292:3: error: the register ‘%r14’ cannot be clobbered in ‘asm’ for
10.76 the current target
10.76   292 |   __asm__ __volatile__(
10.76       |   ^~~~~~~
10.76 fp25519_x64.c: In function ‘red_EltFp25519_2w_x64’:
10.76 fp25519_x64.c:443:3: error: the register ‘%r11’ cannot be clobbered in ‘asm’ for
10.76 the current target
10.76   443 |   __asm__ __volatile__(
10.76       |   ^~~~~~~
10.76 fp25519_x64.c: In function ‘mul_256x256_integer_x64’:
10.76 fp25519_x64.c:529:3: error: the register ‘%r13’ cannot be clobbered in ‘asm’ for
10.76 the current target
10.76   529 |   __asm__ __volatile__(
10.76       |   ^~~~~~~
10.76 fp25519_x64.c: In function ‘sqr_256x256_integer_x64’:
10.76 fp25519_x64.c:627:4: error: the register ‘%r14’ cannot be clobbered in ‘asm’ for
10.76 the current target
10.76   627 |    __asm__ __volatile__(
10.76       |    ^~~~~~~
10.76 fp25519_x64.c: In function ‘red_EltFp25519_1w_x64’:
10.76 fp25519_x64.c:711:3: error: the register ‘%r11’ cannot be clobbered in ‘asm’ for
10.76 the current target
10.76   711 |   __asm__ __volatile__(
10.76       |   ^~~~~~~
10.76 fp25519_x64.c: In function ‘add_EltFp25519_1w_x64’:
10.76 fp25519_x64.c:766:3: error: the register ‘%r11’ cannot be clobbered in ‘asm’ for
10.76 the current target
10.76   766 |   __asm__ __volatile__(
10.76       |   ^~~~~~~
10.76 fp25519_x64.c: In function ‘sub_EltFp25519_1w_x64’:
10.76 fp25519_x64.c:789:3: error: the register ‘%r11’ cannot be clobbered in ‘asm’ for
10.76 the current target
10.76   789 |   __asm__ __volatile__(
10.76       |   ^~~~~~~
10.76 fp25519_x64.c: In function ‘mul_a24_EltFp25519_1w_x64’:
10.76 fp25519_x64.c:816:3: error: the register ‘%r11’ cannot be clobbered in ‘asm’ for
10.76 the current target
10.76   816 |   __asm__ __volatile__(
10.76       |   ^~~~~~~
10.76 At top level:
10.76 cc1: note: unrecognized command-line option ‘-Wno-self-assign’ may have been
10.76 intended to silence earlier diagnostics
10.76 cc1: note: unrecognized command-line option ‘-Wno-parentheses-equality’ may have
10.76 been intended to silence earlier diagnostics
10.76 cc1: note: unrecognized command-line option ‘-Wno-constant-logical-operand’ may
10.76 have been intended to silence earlier diagnostics
10.76 make: *** [Makefile:248: fp25519_x64.o] Error 1
10.76
10.76 make failed, exit code 2
10.76
10.76 Gem files will remain installed in /usr/local/bundle/gems/x25519-1.0.10 for
10.76 inspection.
10.76 Results logged to
10.76 /usr/local/bundle/extensions/x86-linux/3.3.0/x25519-1.0.10/gem_make.out
10.76
10.76   /usr/local/lib/ruby/site_ruby/3.3.0/rubygems/ext/builder.rb:125:in `run'
10.76 /usr/local/lib/ruby/site_ruby/3.3.0/rubygems/ext/builder.rb:51:in `block in
10.76 make'
10.76   /usr/local/lib/ruby/site_ruby/3.3.0/rubygems/ext/builder.rb:43:in `each'
10.76   /usr/local/lib/ruby/site_ruby/3.3.0/rubygems/ext/builder.rb:43:in `make'
10.76 /usr/local/lib/ruby/site_ruby/3.3.0/rubygems/ext/ext_conf_builder.rb:42:in
10.76 `build'
10.76 /usr/local/lib/ruby/site_ruby/3.3.0/rubygems/ext/builder.rb:193:in
10.76 `build_extension'
10.76 /usr/local/lib/ruby/site_ruby/3.3.0/rubygems/ext/builder.rb:227:in `block in
10.76 build_extensions'
10.76   /usr/local/lib/ruby/site_ruby/3.3.0/rubygems/ext/builder.rb:224:in `each'
10.76 /usr/local/lib/ruby/site_ruby/3.3.0/rubygems/ext/builder.rb:224:in
10.76 `build_extensions'
10.76 /usr/local/lib/ruby/site_ruby/3.3.0/rubygems/installer.rb:853:in
10.76 `build_extensions'
10.76 /usr/local/bundle/gems/bundler-2.5.14/lib/bundler/rubygems_gem_installer.rb:79:in
10.76 `build_extensions'
10.76 /usr/local/bundle/gems/bundler-2.5.14/lib/bundler/rubygems_gem_installer.rb:28:in
10.76 `install'
10.76 /usr/local/bundle/gems/bundler-2.5.14/lib/bundler/source/rubygems.rb:205:in
10.76 `install'
10.76 /usr/local/bundle/gems/bundler-2.5.14/lib/bundler/installer/gem_installer.rb:54:in
10.76 `install'
10.76 /usr/local/bundle/gems/bundler-2.5.14/lib/bundler/installer/gem_installer.rb:16:in
10.76 `install_from_spec'
10.76 /usr/local/bundle/gems/bundler-2.5.14/lib/bundler/installer/parallel_installer.rb:132:in
10.76 `do_install'
10.76 /usr/local/bundle/gems/bundler-2.5.14/lib/bundler/installer/parallel_installer.rb:123:in
10.76 `block in worker_pool'
10.76   /usr/local/bundle/gems/bundler-2.5.14/lib/bundler/worker.rb:62:in `apply_func'
10.76 /usr/local/bundle/gems/bundler-2.5.14/lib/bundler/worker.rb:57:in `block in
10.76 process_queue'
10.76   <internal:kernel>:187:in `loop'
10.76 /usr/local/bundle/gems/bundler-2.5.14/lib/bundler/worker.rb:54:in
10.76 `process_queue'
10.76 /usr/local/bundle/gems/bundler-2.5.14/lib/bundler/worker.rb:90:in `block (2
10.76 levels) in create_threads'
10.76
10.76 An error occurred while installing x25519 (1.0.10), and Bundler cannot continue.
10.76
10.76 In Gemfile:
10.76   kamal was resolved to 1.7.3, which depends on
10.76     x25519

[djmb]

Thanks for the report @kobaltz. I think we'll need to revert this then, if we can't reliably build the dependency we'll need to drop it.

@HLFH - you'll have to use a wrapper script to include the Curve25519 support, something like this maybe (though I haven't tested this works):

#!/usr/bin/env ruby

require "bundler/inline"

gemfile(true, quiet: true) do
  source "https://rubygems.org"

  gem "kamal", "~> 1.7"
  gem "x25519"
end

load Gem.bin_path("kamal", "kamal")