Sonn Ygg wrote:
Hello all,
I know how to use public key to encrypt data if I create public/private
key pair by myself through OpenSSL::PKey::RSA. However, if I only know
other guy's public key, how could I encrypt data with his/her public
key? Is there any method in the module OpenSSL::PKey::RSA to support it?
Thanks!
Does any one can help me about this question? thanks.
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Sonn Ygg wrote:
Sonn Ygg wrote:
Hello all,
I know how to use public key to encrypt data if I create public/private
key pair by myself through OpenSSL::PKey::RSA. However, if I only know
other guy's public key, how could I encrypt data with his/her public
key? Is there any method in the module OpenSSL::PKey::RSA to support it?
Thanks!Does any one can help me about this question? thanks.
If you're trying to do GPG, there's a module that might help. If not, I'd have
to research this closely as the documentation for OpenSSL is lacking.
require 'gpgme'
def get_pgp_keys emails
# this function searches your GPG keyring for valid public keys for
# each of the email addresses listed in emails
# if a key is not found for an email, it will be omitted from the output list
ctx = GPGME::Ctx.new
keys =
emails.each do |email|
begin
ctx.keylist_start email
key = ctx.keylist_next
ctx.keylist_end
keys << key
rescue EOFError
# the key for this email was not found and keylist_next threw this error
# this is expected behavior when there was no key found for the email
address
end
end
keys
end
# check list with gpg
keys = get_pgp_keys to_emails
plaintext = @body.join ""
# if all match, encrypt @body
if keys.size == to_emails.size
keys << Redwood.get_personal_public_key
ciphertext = GPGME.encrypt keys, plaintext, {:armor => true, :sign =>
true, :passphrase_callback => getpass }
@body = ciphertext.split "\n"
@body.map { |l| l+"\n" }
else
GPGME.sign plaintext, nil, { :mode => GPGME::SIG_MODE_CLEAR }
end
end