Sha256: be3ccf4c09481e3d0f46296a6c59f58a829815b39ba32b5ac376ee1d39c2b4f0
Contents?: true
Size: 933 Bytes
Versions: 9
Compression:
Stored size: 933 Bytes
Contents
# coding: utf-8
# typed: strict
# frozen_string_literal: true
require 'digest'
require 'openssl'
class PDF::Reader
# Decrypts data using the AESV3 algorithim defined in the PDF 1.7, Extension Level 3 spec.
# Requires a decryption key, which is usually generated by PDF::Reader::KeyBuilderV5
#
class AesV3SecurityHandler
def initialize(key)
@encrypt_key = key
@cipher = "AES-256-CBC"
end
##7.6.2 General Encryption Algorithm
#
# Algorithm 1: Encryption of data using the RC4 or AES algorithms
#
# used to decrypt RC4/AES encrypted PDF streams (buf)
#
# buf - a string to decrypt
# ref - a PDF::Reader::Reference for the object to decrypt
#
def decrypt( buf, ref )
cipher = OpenSSL::Cipher.new(@cipher)
cipher.decrypt
cipher.key = @encrypt_key.dup
cipher.iv = buf[0..15]
cipher.update(buf[16..-1]) + cipher.final
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems