cast.go

     1  // Copyright 2024 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 aes
     6  
     7  import (
     8  	"bytes"
     9  	"crypto/internal/fips140"
    10  	_ "crypto/internal/fips140/check"
    11  	"errors"
    12  )
    13  
    14  func init() {
    15  	fips140.CAST("AES-CBC", func() error {
    16  		key := []byte{
    17  			0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
    18  			0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
    19  		}
    20  		iv := [16]byte{
    21  			0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
    22  			0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
    23  		}
    24  		plaintext := []byte{
    25  			0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
    26  			0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
    27  		}
    28  		ciphertext := []byte{
    29  			0xdf, 0x76, 0x26, 0x4b, 0xd3, 0xb2, 0xc4, 0x8d,
    30  			0x40, 0xa2, 0x6e, 0x7a, 0xc4, 0xff, 0xbd, 0x35,
    31  		}
    32  		b, err := New(key)
    33  		if err != nil {
    34  			return err
    35  		}
    36  		buf := make([]byte, 16)
    37  		NewCBCEncrypter(b, iv).CryptBlocks(buf, plaintext)
    38  		if !bytes.Equal(buf, ciphertext) {
    39  			return errors.New("unexpected result")
    40  		}
    41  		NewCBCDecrypter(b, iv).CryptBlocks(buf, ciphertext)
    42  		if !bytes.Equal(buf, plaintext) {
    43  			return errors.New("unexpected result")
    44  		}
    45  		return nil
    46  	})
    47  }
    48
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