1 files changed, 141 insertions, 0 deletions
diff --git a/docs/development/custom-vectors/cast5/verify_cast5.go b/docs/development/custom-vectors/cast5/verify_cast5.go
new file mode 100644
index 00000000..49e1023d
--- /dev/null
+++ b/docs/development/custom-vectors/cast5/verify_cast5.go
@@ -0,0 +1,141 @@
+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, expected_ciphertext []byte)
+}
+
+type ofbVerifier struct{}
+
+func (o ofbVerifier) validate(count string, key, iv, plaintext, expected_ciphertext []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, expected_ciphertext) {
+		panic(fmt.Errorf("vector mismatch @ COUNT = %s:\n  %s != %s\n",
+			count,
+			hex.EncodeToString(expected_ciphertext),
+			hex.EncodeToString(ciphertext)))
+	}
+}
+
+type cbcVerifier struct{}
+
+func (o cbcVerifier) validate(count string, key, iv, plaintext, expected_ciphertext []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, expected_ciphertext) {
+		panic(fmt.Errorf("vector mismatch @ COUNT = %s:\n  %s != %s\n",
+			count,
+			hex.EncodeToString(expected_ciphertext),
+			hex.EncodeToString(ciphertext)))
+	}
+}
+
+type cfbVerifier struct{}
+
+func (o cfbVerifier) validate(count string, key, iv, plaintext, expected_ciphertext []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, expected_ciphertext) {
+		panic(fmt.Errorf("vector mismatch @ COUNT = %s:\n  %s != %s\n",
+			count,
+			hex.EncodeToString(expected_ciphertext),
+			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{},
+		"tests/hazmat/primitives/vectors/ciphers/CAST5/cast5-ofb.txt")
+	fmt.Println("OFB OK.")
+	validateVectors(cfbVerifier{},
+		"tests/hazmat/primitives/vectors/ciphers/CAST5/cast5-cfb.txt")
+	fmt.Println("CFB OK.")
+	validateVectors(cbcVerifier{},
+		"tests/hazmat/primitives/vectors/ciphers/CAST5/cast5-cbc.txt")
+	fmt.Println("CBC OK.")
+}