Class: SmcUtil::FileValidator

Inherits:
Object
  • Object
show all
Defined in:
lib/smcutil/file_validator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ FileValidator

Returns a new instance of FileValidator.



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# File 'lib/smcutil/file_validator.rb', line 7

def initialize(file)
  @file = file
end

Instance Attribute Details

#errors ⇒ Object (readonly)

Returns the value of attribute errors.



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# File 'lib/smcutil/file_validator.rb', line 5

def errors
  @errors
end

#file ⇒ Object (readonly)

Returns the value of attribute file.



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# File 'lib/smcutil/file_validator.rb', line 5

def file
  @file
end

Instance Method Details

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/smcutil/file_validator.rb', line 19

def valid?
  validate!

  !@errors.any?
end

#validate! ⇒ Object 



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# File 'lib/smcutil/file_validator.rb', line 11

def validate!
  @errors = []

  validate_regions!
  validate_headers!
  validate_signature!
end

#validate_headers! ⇒ Object 



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# File 'lib/smcutil/file_validator.rb', line 29

def validate_headers!
  return false unless @file.headers.any? || (@file.headers.count != @file.regions.count)

  hash_algorithm = nil

  case @file.headers[0].length
  when 20
    hash_algorithm = OpenSSL::Digest::SHA1
  when 32
    hash_algorithm = OpenSSL::Digest::SHA256
  when 64
    hash_algorithm = OpenSSL::Digest::SHA512
  else
    @errors << "ERROR: Digest of header row with length #{@file.headers[0].count} bytes is unsupported.  (But pull requests are accepted)" and return
  end

  zipped_regions = @file.regions.zip(@file.headers)
  zipped_regions.each do |region, header|
    begin
      hash = hash_algorithm.new

      hash << region.data

      if hash.digest == header
        puts "DEBUG: Validated hash for region #{region}" if SmcUtil::DEBUG
      else
        @errors << "Header hash for region #{region} does not match expected"
      end
    rescue => ex
      puts "ERROR: #{ex}"
      puts ex.backtrace
    end
  end
end

#validate_regions! ⇒ Object 



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# File 'lib/smcutil/file_validator.rb', line 25

def validate_regions!
  @file.regions.any?
end

#validate_signature! ⇒ Object 



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# File 'lib/smcutil/file_validator.rb', line 64

def validate_signature!
  # TODO: Find the RSA 2048 bit key that signs this
end