经过一些研究,反复阅读 OpenSSL 文档并探索Origami 解决方案,我构建了下面的代码,并设法将本地生成的签名/证书插入到 pdf 文档中。现在我只需要弄清楚如何将它与外部生成的证书一起使用(查看下面的版本 2,我在其中解决了它)。我打开了一个新问题,您可以在其中找到有关我在使用 OpenSSL 和DER 编码证书时遇到的困难的一些详细信息。
为了开发第 2 版,我还花了一些时间想知道如何添加注释——以便签名在 Adobe 阅读器中变得可见——而不向文档添加新页面。从折纸文档中,我找到了 get_page 方法,它解决了我最后一个问题。我正在使用 Adobe Reader X,作为记录。
希望你会发现这很有用;-)。
版本 1 - 生成证书和密钥文件,并将它们直接插入到文档中
require 'openssl'
begin
require 'origami'
rescue LoadError
ORIGAMIDIR = "C:\RailsInstaller\Ruby1.9.3\lib\ruby\gems\1.9.1\gems\origami-1.2.4\lib"
$: << ORIGAMIDIR
require 'origami'
end
include Origami
# Code below is based on documentation available on
# http://www.ruby-doc.org/stdlib-1.9.3/libdoc/openssl/rdoc/OpenSSL.html
key = OpenSSL::PKey::RSA.new 2048
open 'private_key.pem', 'w' do |io| io.write key.to_pem end
open 'public_key.pem', 'w' do |io| io.write key.public_key.to_pem end
cipher = OpenSSL::Cipher::Cipher.new 'AES-128-CBC'
pass_phrase = 'Origami rocks'
key_secure = key.export cipher, pass_phrase
open 'private_key.pem', 'w' do |io|
io.write key_secure
end
#Create the certificate
name = OpenSSL::X509::Name.parse 'CN=nobody/DC=example'
cert = OpenSSL::X509::Certificate.new
cert.version = 2
cert.serial = 0
cert.not_before = Time.now
cert.not_after = Time.now + 3600
cert.public_key = key.public_key
cert.subject = name
OUTPUTFILE = "test.pdf"
contents = ContentStream.new.setFilter(:FlateDecode)
contents.write OUTPUTFILE,
:x => 350, :y => 750, :rendering => Text::Rendering::STROKE, :size => 30
pdf = PDF.read('Sample.pdf')
# Open certificate files
#sigannot = Annotation::Widget::Signature.new
#sigannot.Rect = Rectangle[:llx => 89.0, :lly => 386.0, :urx => 190.0, :ury => 353.0]
#page.add_annot(sigannot)
# Sign the PDF with the specified keys
pdf.sign(cert, key,
:method => 'adbe.pkcs7.sha1',
#:annotation => sigannot,
:location => "Portugal",
:contact => "myemail@email.tt",
:reason => "Proof of Concept"
)
# Save the resulting file
pdf.save(OUTPUTFILE)
版本 2 - 使用现有证书签署 pdf 文档
require 'openssl'
begin
require 'origami'
rescue LoadError
ORIGAMIDIR = "C:\RailsInstaller\Ruby1.9.3\lib\ruby\gems\1.9.1\gems\origami-1.2.4\lib"
$: << ORIGAMIDIR
require 'origami'
end
include Origami
INPUTFILE = "Sample.pdf"
@inputfile = String.new(INPUTFILE)
OUTPUTFILE = @inputfile.insert(INPUTFILE.rindex("."),"_signed")
CERTFILE = "certificate.pem"
RSAKEYFILE = "private_key.pem"
passphrase = "your passphrase"
key4pem=File.read RSAKEYFILE
key = OpenSSL::PKey::RSA.new key4pem, passphrase
cert = OpenSSL::X509::Certificate.new(File.read CERTFILE)
pdf = PDF.read(INPUTFILE)
page = pdf.get_page(1)
# Add signature annotation (so it becomes visibles in pdf document)
sigannot = Annotation::Widget::Signature.new
sigannot.Rect = Rectangle[:llx => 89.0, :lly => 386.0, :urx => 190.0, :ury => 353.0]
page.add_annot(sigannot)
# Sign the PDF with the specified keys
pdf.sign(cert, key,
:method => 'adbe.pkcs7.sha1',
:annotation => sigannot,
:location => "Portugal",
:contact => "myemail@email.tt",
:reason => "Proof of Concept"
)
# Save the resulting file
pdf.save(OUTPUTFILE)