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ECDSA usage from Ruby.
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require 'openssl' | |
require 'base64' | |
# ===== \/ sign ===== | |
# generate keys | |
key = OpenSSL::PKey::EC.new("secp256k1") | |
key.generate_key | |
public_key = key.public_key | |
public_key_hex = public_key.to_bn.to_s(16).downcase # public key in hex format | |
# sign a message | |
data = "My message to sign" | |
signature = key.dsa_sign_asn1(data) | |
signature_base64 = Base64.encode64(signature).gsub("\n", "") | |
# ===== \/ verify ===== | |
# rebuild key | |
group = OpenSSL::PKey::EC::Group.new('secp256k1') | |
key = OpenSSL::PKey::EC.new(group) | |
# create point from hex key | |
public_key_bn = OpenSSL::BN.new(public_key_hex, 16) | |
public_key = OpenSSL::PKey::EC::Point.new(group, public_key_bn) | |
key.public_key = public_key | |
# verify message | |
data = "My message to sign" | |
signature = Base64.decode64(signature_base64) | |
key.dsa_verify_asn1(data, signature) |
Hi @ostinelli, @simlegate,
I needed some help.
I generated a key using key = OpenSSL::PKey::EC.new("secp256k1").generate_key
then I did private_key = key.private_key.to_s(16)
In another flow, I only have this private_key
from above step. How can I generate back OpenSSL::PKey::EC
instance using this private key?
Thanks in advance
Hi @aniketdivekar, here you go!
key = OpenSSL::PKey::EC.new("secp256k1").generate_key
private_key = key.private_key.to_s(16)
# regenerate
group = OpenSSL::PKey::EC::Group.new('secp256k1')
new_key = OpenSSL::PKey::EC.new(group)
new_key.private_key = OpenSSL::BN.new(private_key, 16)
new_key.public_key = group.generator.mul(new_key.private_key)
Hi, do you have version of this script for openssl version 3.0 & above? Because the keys are not mutable since 3.0 & above and will give this error.
15:30:48]: Error in your Fastfile at line 819
[15:30:48]: 817: # generate keys
[15:30:48]: 818: key = OpenSSL::PKey::EC.new("secp256k1")
[15:30:48]: => 819: key.generate_key
[15:30:48]: 820: public_key = key.public_key
[15:30:48]: 821: public_key_hex = public_key.to_bn.to_s(16).downcase # public key in hex format
[15:30:48]: pkeys are immutable on OpenSSL 3.0
+------+----------------------+-------------+
| fastlane summary |
+------+----------------------+-------------+
| Step | Action | Time (in s) |
+------+----------------------+-------------+
| 1 | default_platform | 0 |
| 2 | xcodes | 0 |
| 3 | ensure_env_vars | 0 |
| 4 | set_info_plist_value | 0 |
+------+----------------------+-------------+
[15:30:48]: fastlane finished with errors
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Fastfile:819:in `generate_key!': \e[31m[!] pkeys are immutable on OpenSSL 3.0\e[0m (OpenSSL::PKey::PKeyError)
from Fastfile:819:in `get_force_update_message'
from Fastfile:252:in `block (2 levels) in parsing_binding'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/fastlane-2.212.2/fastlane/lib/fastlane/lane.rb:33:in `call'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/fastlane-2.212.2/fastlane/lib/fastlane/runner.rb:49:in `block in execute'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/fastlane-2.212.2/fastlane/lib/fastlane/runner.rb:45:in `chdir'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/fastlane-2.212.2/fastlane/lib/fastlane/runner.rb:45:in `execute'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/fastlane-2.212.2/fastlane/lib/fastlane/lane_manager.rb:47:in `cruise_lane'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/fastlane-2.212.2/fastlane/lib/fastlane/command_line_handler.rb:36:in `handle'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/fastlane-2.212.2/fastlane/lib/fastlane/commands_generator.rb:110:in `block (2 levels) in run'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/commander-4.6.0/lib/commander/command.rb:187:in `call'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/commander-4.6.0/lib/commander/command.rb:157:in `run'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/commander-4.6.0/lib/commander/runner.rb:444:in `run_active_command'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/fastlane-2.212.2/fastlane_core/lib/fastlane_core/ui/fastlane_runner.rb:124:in `run!'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/commander-4.6.0/lib/commander/delegates.rb:18:in `run!'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/fastlane-2.212.2/fastlane/lib/fastlane/commands_generator.rb:354:in `run'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/fastlane-2.212.2/fastlane/lib/fastlane/commands_generator.rb:43:in `start'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/fastlane-2.212.2/fastlane/lib/fastlane/cli_tools_distributor.rb:123:in `take_off'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/gems/fastlane-2.212.2/bin/fastlane:23:in `<top (required)>'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/bin/fastlane:25:in `load'
from /opt/homebrew/Cellar/fastlane/2.212.2/libexec/bin/fastlane:25:in `<main>'
If you are getting an error about immutability, use the following
key = OpenSSL::PKey::EC.generate("secp256k1")
instead of
key = OpenSSL::PKey::EC.new("secp256k1") # IT'S WRONG FOR OPENSSL 3
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Maybe you should list the example how to generate public key by private key.
Here is the reference