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package main import ( "bufio" "bytes" "code.google.com/p/go.crypto/cast5" "crypto/cipher" "encoding/hex" "fmt" "os" "strings" ) func unhexlify(s string) []byte { bytes, err := hex.DecodeString(s) if err != nil { panic(err) } return bytes } type vectorArgs struct { count string key string iv string plaintext string ciphertext string } type vectorVerifier interface { validate(count string, key, iv, plaintext, expectedCiphertext []byte) } type ofbVerifier struct{} func (o ofbVerifier) validate(count string, key, iv, plaintext, expectedCiphertext []byte) { block, err := cast5.NewCipher(key) if err != nil { panic(err) } ciphertext := make([]byte, len(plaintext)) stream := cipher.NewOFB(block, iv) stream.XORKeyStream(ciphertext, plaintext) if !bytes.Equal(ciphertext, expectedCiphertext) { panic(fmt.Errorf("vector mismatch @ COUNT = %s:\n %s != %s\n", count, hex.EncodeToString(expectedCiphertext), hex.EncodeToString(ciphertext))) } } type cbcVerifier struct{} func (o cbcVerifier) validate(count string, key, iv, plaintext, expectedCiphertext []byte) { block, err := cast5.NewCipher(key) if err != nil { panic(err) } ciphertext := make([]byte, len(plaintext)) mode := cipher.NewCBCEncrypter(block, iv) mode.CryptBlocks(ciphertext, plaintext) if !bytes.Equal(ciphertext, expectedCiphertext) { panic(fmt.Errorf("vector mismatch @ COUNT = %s:\n %s != %s\n", count, hex.EncodeToString(expectedCiphertext), hex.EncodeToString(ciphertext))) } } type cfbVerifier struct{} func (o cfbVerifier) validate(count string, key, iv, plaintext, expectedCiphertext []byte) { block, err := cast5.NewCipher(key) if err != nil { panic(err) } ciphertext := make([]byte, len(plaintext)) stream := cipher.NewCFBEncrypter(block, iv) stream.XORKeyStream(ciphertext, plaintext) if !bytes.Equal(ciphertext, expectedCiphertext) { panic(fmt.Errorf("vector mismatch @ COUNT = %s:\n %s != %s\n", count, hex.EncodeToString(expectedCiphertext), hex.EncodeToString(ciphertext))) } } type ctrVerifier struct{} func (o ctrVerifier) validate(count string, key, iv, plaintext, expectedCiphertext []byte) { block, err := cast5.NewCipher(key) if err != nil { panic(err) } ciphertext := make([]byte, len(plaintext)) stream := cipher.NewCTR(block, iv) stream.XORKeyStream(ciphertext, plaintext) if !bytes.Equal(ciphertext, expectedCiphertext) { panic(fmt.Errorf("vector mismatch @ COUNT = %s:\n %s != %s\n", count, hex.EncodeToString(expectedCiphertext), hex.EncodeToString(ciphertext))) } } func validateVectors(verifier vectorVerifier, filename string) { vectors, err := os.Open(filename) if err != nil { panic(err) } defer vectors.Close() var segments []string var vector *vectorArgs scanner := bufio.NewScanner(vectors) for scanner.Scan() { segments = strings.Split(scanner.Text(), " = ") switch { case strings.ToUpper(segments[0]) == "COUNT": if vector != nil { verifier.validate(vector.count, unhexlify(vector.key), unhexlify(vector.iv), unhexlify(vector.plaintext), unhexlify(vector.ciphertext)) } vector = &vectorArgs{count: segments[1]} case strings.ToUpper(segments[0]) == "IV": vector.iv = segments[1][:16] case strings.ToUpper(segments[0]) == "KEY": vector.key = segments[1] case strings.ToUpper(segments[0]) == "PLAINTEXT": vector.plaintext = segments[1] case strings.ToUpper(segments[0]) == "CIPHERTEXT": vector.ciphertext = segments[1] } } } func main() { validateVectors(ofbVerifier{}, "vectors/cryptography_vectors/ciphers/CAST5/cast5-ofb.txt") fmt.Println("OFB OK.") validateVectors(cfbVerifier{}, "vectors/cryptography_vectors/ciphers/CAST5/cast5-cfb.txt") fmt.Println("CFB OK.") validateVectors(cbcVerifier{}, "vectors/cryptography_vectors/ciphers/CAST5/cast5-cbc.txt") fmt.Println("CBC OK.") validateVectors(ctrVerifier{}, "vectors/cryptography_vectors/ciphers/CAST5/cast5-ctr.txt") fmt.Println("CTR OK.") }