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Source file src/crypto/aes/modes_test.go

Documentation: crypto/aes

  // Copyright 2016 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package aes
  
  import (
  	"crypto/cipher"
  	"testing"
  )
  
  // Check that the optimized implementations of cipher modes will
  // be picked up correctly.
  
  // testInterface can be asserted to check that a type originates
  // from this test group.
  type testInterface interface {
  	InAESPackage() bool
  }
  
  // testBlock implements the cipher.Block interface and any *Able
  // interfaces that need to be tested.
  type testBlock struct{}
  
  func (*testBlock) BlockSize() int      { return 0 }
  func (*testBlock) Encrypt(a, b []byte) {}
  func (*testBlock) Decrypt(a, b []byte) {}
  func (*testBlock) NewGCM(int) (cipher.AEAD, error) {
  	return &testAEAD{}, nil
  }
  func (*testBlock) NewCBCEncrypter([]byte) cipher.BlockMode {
  	return &testBlockMode{}
  }
  func (*testBlock) NewCBCDecrypter([]byte) cipher.BlockMode {
  	return &testBlockMode{}
  }
  func (*testBlock) NewCTR([]byte) cipher.Stream {
  	return &testStream{}
  }
  
  // testAEAD implements the cipher.AEAD interface.
  type testAEAD struct{}
  
  func (*testAEAD) NonceSize() int                         { return 0 }
  func (*testAEAD) Overhead() int                          { return 0 }
  func (*testAEAD) Seal(a, b, c, d []byte) []byte          { return []byte{} }
  func (*testAEAD) Open(a, b, c, d []byte) ([]byte, error) { return []byte{}, nil }
  func (*testAEAD) InAESPackage() bool                     { return true }
  
  // Test the gcmAble interface is detected correctly by the cipher package.
  func TestGCMAble(t *testing.T) {
  	b := cipher.Block(&testBlock{})
  	if _, ok := b.(gcmAble); !ok {
  		t.Fatalf("testBlock does not implement the gcmAble interface")
  	}
  	aead, err := cipher.NewGCM(b)
  	if err != nil {
  		t.Fatalf("%v", err)
  	}
  	if _, ok := aead.(testInterface); !ok {
  		t.Fatalf("cipher.NewGCM did not use gcmAble interface")
  	}
  }
  
  // testBlockMode implements the cipher.BlockMode interface.
  type testBlockMode struct{}
  
  func (*testBlockMode) BlockSize() int          { return 0 }
  func (*testBlockMode) CryptBlocks(a, b []byte) {}
  func (*testBlockMode) InAESPackage() bool      { return true }
  
  // Test the cbcEncAble interface is detected correctly by the cipher package.
  func TestCBCEncAble(t *testing.T) {
  	b := cipher.Block(&testBlock{})
  	if _, ok := b.(cbcEncAble); !ok {
  		t.Fatalf("testBlock does not implement the cbcEncAble interface")
  	}
  	bm := cipher.NewCBCEncrypter(b, []byte{})
  	if _, ok := bm.(testInterface); !ok {
  		t.Fatalf("cipher.NewCBCEncrypter did not use cbcEncAble interface")
  	}
  }
  
  // Test the cbcDecAble interface is detected correctly by the cipher package.
  func TestCBCDecAble(t *testing.T) {
  	b := cipher.Block(&testBlock{})
  	if _, ok := b.(cbcDecAble); !ok {
  		t.Fatalf("testBlock does not implement the cbcDecAble interface")
  	}
  	bm := cipher.NewCBCDecrypter(b, []byte{})
  	if _, ok := bm.(testInterface); !ok {
  		t.Fatalf("cipher.NewCBCDecrypter did not use cbcDecAble interface")
  	}
  }
  
  // testStream implements the cipher.Stream interface.
  type testStream struct{}
  
  func (*testStream) XORKeyStream(a, b []byte) {}
  func (*testStream) InAESPackage() bool       { return true }
  
  // Test the ctrAble interface is detected correctly by the cipher package.
  func TestCTRAble(t *testing.T) {
  	b := cipher.Block(&testBlock{})
  	if _, ok := b.(ctrAble); !ok {
  		t.Fatalf("testBlock does not implement the ctrAble interface")
  	}
  	s := cipher.NewCTR(b, []byte{})
  	if _, ok := s.(testInterface); !ok {
  		t.Fatalf("cipher.NewCTR did not use ctrAble interface")
  	}
  }
  

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