GostMagma

gem 'gost_magma'

require 'gost_magma'
include GostMagma

BlockSize = Magma::BlockLengthInBytes

# GOST R 34.13-2015 Magma test data
SelfTestGostMMasterKeyData = [
  0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99, 0x88, 
  0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0x00,
  0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 
  0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
].pack('C*').freeze
key = SelfTestGostMMasterKeyData

SelfTestGostMPlainText = [
  0x92, 0xde, 0xf0, 0x6b, 0x3c, 0x13, 0x0a, 0x59, 
  0xdb, 0x54, 0xc7, 0x04, 0xf8, 0x18, 0x9d, 0x20,
  0x4a, 0x98, 0xfb, 0x2e, 0x67, 0xa8, 0x02, 0x4c, 
  0x89, 0x12, 0x40, 0x9b, 0x17, 0xb5, 0x7e, 0x41,
].pack('C*').freeze
plain_text = SelfTestGostMPlainText

# ECB mode
SelfTestGostMEcbEncText = [
  0x2b, 0x07, 0x3f, 0x04, 0x94, 0xf3, 0x72, 0xa0, 
  0xde, 0x70, 0xe7, 0x15, 0xd3, 0x55, 0x6e, 0x48,
  0x11, 0xd8, 0xd9, 0xe9, 0xea, 0xcf, 0xbc, 0x1e, 
  0x7c, 0x68, 0x26, 0x09, 0x96, 0xc6, 0x7e, 0xfb
].pack('C*').freeze
encrypted_test = SelfTestGostMEcbEncText

encrypted_text = MagmaEcb.new(key).encrypt(plain_text)
puts "ECB encrypted_text == encrypted_test: #{encrypted_text == encrypted_test}" 
    
decrypted_text = MagmaEcb.new(key).decrypt(encrypted_test)
puts "ECB decrypted_text == plain_text: #{decrypted_text == plain_text}" 

# OMAC mode
SelfTestGostMMacValue = [
  0x15, 0x4e, 0x72, 0x10, 0x20, 0x30, 0xc5, 0xbb
].pack('C*').freeze
mac_test = SelfTestGostMMacValue

mac = MagmaOmac.new(key, mac_test.length).update(plain_text).final
puts "OMAC mac == mac_test: #{mac == mac_test}" 

# CTR mode 
SelfTestGostMCtrSV = [
  0x12, 0x34, 0x56, 0x78
].pack('C*').freeze
iv = SelfTestGostMCtrSV

SelfTestGostMCtrEncText = [
  0x4e, 0x98, 0x11, 0x0c, 0x97, 0xb7, 0xb9, 0x3c,
  0x3e, 0x25, 0x0d, 0x93, 0xd6, 0xe8, 0x5d, 0x69,
  0x13, 0x6d, 0x86, 0x88, 0x07, 0xb2, 0xdb, 0xef,
  0x56, 0x8e, 0xb6, 0x80, 0xab, 0x52, 0xa1, 0x2d    
].pack('C*').freeze
encrypted_test = SelfTestGostMCtrEncText

encrypted_text = MagmaCtr.new(key, iv, BlockSize).encrypt(plain_text)
puts "CTR encrypted_text == encrypted_test: #{encrypted_text == encrypted_test}"

# CTR multi-part usage    
text_len = plain_text.length
ctx = MagmaCtr.new(key, iv, BlockSize)
decrypted_text = ctx.decrypt(encrypted_test[0...text_len/3]) +
  ctx.decrypt(encrypted_test[text_len/3..-1])
puts "CTR decrypted_text == plain_text: #{decrypted_text == plain_text}" 

# Key export/import (TC 26 KExp15/KImp15) 
TC26_K = [ 
	0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF, 
	0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 
	0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10, 
	0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF 
].pack('C*').freeze
TC26_Kmac = [
	0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 
	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 
	0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F 
].pack('C*').freeze
TC26_Kenc = [ 
	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 
	0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 
	0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 
	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37
].pack('C*').freeze
TC26_IV_M = [ 
	0x67, 0xBE, 0xD6, 0x54
].pack('C*').freeze
TC26_Kexp_M = [
	0xCF, 0xD5, 0xA1, 0x2D,	0x5B, 0x81, 0xB6, 0xE1, 
  0xE9, 0x9C, 0x91, 0x6D, 0x07, 0x90, 0x0C, 0x6A, 
  0xC1, 0x27, 0x03, 0xFB, 0x3A, 0xBD, 0xED, 0x55, 
  0x56, 0x7B, 0xF3, 0x74, 0x2C, 0x89, 0x9C, 0x75, 
  0x5D, 0xAF, 0xE7, 0xB4, 0x2E, 0x3A, 0x8B, 0xD9
].pack('C*').freeze

key = TC26_K
key_mac = TC26_Kmac
key_enc = TC26_Kenc
iv = TC26_IV_M
key_exp_test = TC26_Kexp_M

key_exp = MagmaKeyExpImp::export(key, key_mac, key_enc, iv)
puts "Key Export key_exp == key_exp_test: #{key_exp == key_exp_test}"

imp_key = MagmaKeyExpImp::import(key_exp_test, key_mac, key_enc, iv)
puts "Key Import imp_key == key: #{imp_key == key}"