github.com/ice-blockchain/go/src@v0.0.0-20240403114104-1564d284e521/crypto/des/internal_test.go (about)

     1  // Copyright 2023 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package des
     6  
     7  import "testing"
     8  
     9  func TestInitialPermute(t *testing.T) {
    10  	for i := uint(0); i < 64; i++ {
    11  		bit := uint64(1) << i
    12  		got := permuteInitialBlock(bit)
    13  		want := uint64(1) << finalPermutation[63-i]
    14  		if got != want {
    15  			t.Errorf("permute(%x) = %x, want %x", bit, got, want)
    16  		}
    17  	}
    18  }
    19  
    20  func TestFinalPermute(t *testing.T) {
    21  	for i := uint(0); i < 64; i++ {
    22  		bit := uint64(1) << i
    23  		got := permuteFinalBlock(bit)
    24  		want := uint64(1) << initialPermutation[63-i]
    25  		if got != want {
    26  			t.Errorf("permute(%x) = %x, want %x", bit, got, want)
    27  		}
    28  	}
    29  }