Module: AppInfo::Helper::Algorithm

Included in:
Android::Signature::V2, Android::Signature::V3
Defined in:
lib/app_info/helper/signatures.rb

Overview

Signature Algorithm helper

Constant Summary collapse

SIG_RSA_PSS_WITH_SHA256 =

Signature certificate identifiers

[0x01, 0x01, 0x00, 0x00].freeze
SIG_RSA_PSS_WITH_SHA512 =

0x0102

[0x02, 0x01, 0x00, 0x00].freeze
SIG_RSA_PKCS1_V1_5_WITH_SHA256 =

0x0103

[0x03, 0x01, 0x00, 0x00].freeze
SIG_RSA_PKCS1_V1_5_WITH_SHA512 =

0x0104

[0x04, 0x01, 0x00, 0x00].freeze
SIG_ECDSA_WITH_SHA256 =

0x0201

[0x01, 0x02, 0x00, 0x00].freeze
SIG_ECDSA_WITH_SHA512 =

0x0202

[0x02, 0x02, 0x00, 0x00].freeze
SIG_DSA_WITH_SHA256 =

0x0301

[0x01, 0x03, 0x00, 0x00].freeze
SIG_VERITY_RSA_PKCS1_V1_5_WITH_SHA256 =

0x0421

[0x21, 0x04, 0x00, 0x00].freeze
SIG_VERITY_ECDSA_WITH_SHA256 =

0x0423

[0x23, 0x04, 0x00, 0x00].freeze
SIG_VERITY_DSA_WITH_SHA256 =

0x0425

[0x25, 0x04, 0x00, 0x00].freeze
SIG_STRIPPING_PROTECTION_ATTR_ID =

0xbeeff00d

[0x0d, 0xf0, 0xef, 0xbe].freeze

Instance Method Summary collapse

Instance Method Details

#algorithem_priority(algorithm) ⇒ Object 



186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
 
# File 'lib/app_info/helper/signatures.rb', line 186

def algorithem_priority(algorithm)
  case algorithm
  when SIG_RSA_PSS_WITH_SHA256,
    SIG_RSA_PKCS1_V1_5_WITH_SHA256,
    SIG_ECDSA_WITH_SHA256,
    SIG_DSA_WITH_SHA256
    1
  when SIG_RSA_PSS_WITH_SHA512,
    SIG_RSA_PKCS1_V1_5_WITH_SHA512,
    SIG_ECDSA_WITH_SHA512
    2
  when SIG_VERITY_RSA_PKCS1_V1_5_WITH_SHA256,
    SIG_VERITY_ECDSA_WITH_SHA256,
    SIG_VERITY_DSA_WITH_SHA256
    3
  end
end

#algorithm_match(algorithm) ⇒ Object 



217
218
219
220
221
222
223
224
225
226
227
 
# File 'lib/app_info/helper/signatures.rb', line 217

def algorithm_match(algorithm)
  case algorithm
  when SIG_RSA_PSS_WITH_SHA256, SIG_RSA_PKCS1_V1_5_WITH_SHA256,
    SIG_ECDSA_WITH_SHA256, SIG_DSA_WITH_SHA256,
    SIG_VERITY_RSA_PKCS1_V1_5_WITH_SHA256, SIG_VERITY_ECDSA_WITH_SHA256,
    SIG_VERITY_DSA_WITH_SHA256
    'SHA256'
  when SIG_RSA_PSS_WITH_SHA512, SIG_RSA_PKCS1_V1_5_WITH_SHA512, SIG_ECDSA_WITH_SHA512
    'SHA512'
  end
end

#algorithm_method(algorithm) ⇒ Object 



204
205
206
207
208
209
210
211
212
213
214
215
 
# File 'lib/app_info/helper/signatures.rb', line 204

def algorithm_method(algorithm)
  case algorithm
  when SIG_RSA_PSS_WITH_SHA256, SIG_RSA_PSS_WITH_SHA512,
    SIG_RSA_PKCS1_V1_5_WITH_SHA256, SIG_RSA_PKCS1_V1_5_WITH_SHA512,
    SIG_VERITY_RSA_PKCS1_V1_5_WITH_SHA256
    :rsa
  when SIG_ECDSA_WITH_SHA256, SIG_ECDSA_WITH_SHA512, SIG_VERITY_ECDSA_WITH_SHA256
    :ec
  when SIG_DSA_WITH_SHA256, SIG_VERITY_DSA_WITH_SHA256
    :dsa
  end
end

#best_algorithem(algorithems) ⇒ Object 



170
171
172
173
174
175
 
# File 'lib/app_info/helper/signatures.rb', line 170

def best_algorithem(algorithems)
  methods = algorithems.map { |algorithem| algorithem[:method] }
  best_method = methods.max { |a, b| algorithem_priority(a) <=> algorithem_priority(b) }
  best_method_index = methods.index(best_method)
  algorithems[best_method_index]
end

#compare_algorithem(source, target) ⇒ Object 



177
178
179
180
181
182
183
184
 
# File 'lib/app_info/helper/signatures.rb', line 177

def compare_algorithem(source, target)
  case algorithem_priority(source) <=> algorithem_priority(target)
  when -1
    target
  else
    source
  end
end