Add Speck-128 implementation

cipher/speck/speck_test.go

@@ -0,0 +1,75 @@
+package speck_test
+
+import (
+	"encoding/hex"
+	"slices"
+	"testing"
+
+	"git.omicron.one/playground/cryptography/cipher/speck"
+	"github.com/stretchr/testify/assert"
+)
+
+func DeHex(s string) []byte {
+	decoded, err := hex.DecodeString(s)
+	if err != nil {
+		panic("invalid hex string")
+	}
+	return decoded
+}
+
+type TestVector struct {
+	Key        []byte
+	Plaintext  []byte
+	Ciphertext []byte
+	Param      speck.SpeckParameters
+}
+
+var vectors []TestVector = []TestVector{
+	// Speck128/128 test vector
+	{
+		Key:        DeHex("0f0e0d0c0b0a09080706050403020100"),
+		Plaintext:  DeHex("6c617669757165207469206564616d20"),
+		Ciphertext: DeHex("a65d9851797832657860fedf5c570d18"),
+		Param:      speck.Speck128128,
+	},
+	{
+		Key:        DeHex("17161514131211100f0e0d0c0b0a09080706050403020100"),
+		Plaintext:  DeHex("726148206665696843206f7420746e65"),
+		Ciphertext: DeHex("1be4cf3a13135566f9bc185de03c1886"),
+		Param:      speck.Speck128192,
+	},
+	{
+		Key:        DeHex("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100"),
+		Plaintext:  DeHex("65736f6874206e49202e72656e6f6f70"),
+		Ciphertext: DeHex("4109010405c0f53e4eeeb48d9c188f43"),
+		Param:      speck.Speck128256,
+	},
+}
+
+func TestVectors(t *testing.T) {
+	for _, vector := range vectors {
+		ctx, err := speck.New(vector.Key, vector.Param)
+		assert.NotNil(t, ctx)
+		assert.Nil(t, err)
+
+		// Test in place
+		buffer := slices.Clone(vector.Plaintext)
+		ctx.Encrypt(buffer, buffer)
+		assert.Equal(t, vector.Ciphertext, buffer, ctx.Algorithm())
+		ctx.Decrypt(buffer, buffer)
+		assert.Equal(t, vector.Plaintext, buffer, ctx.Algorithm())
+
+		// Test two buffers
+		dst := make([]byte, len(vector.Ciphertext))
+		src := slices.Clone(vector.Plaintext)
+		ctx.Encrypt(dst, src)
+		assert.Equal(t, vector.Plaintext, src, ctx.Algorithm())
+		assert.Equal(t, vector.Ciphertext, dst, ctx.Algorithm())
+
+		dst = make([]byte, len(vector.Plaintext))
+		src = slices.Clone(vector.Ciphertext)
+		ctx.Decrypt(dst, src)
+		assert.Equal(t, vector.Ciphertext, src, ctx.Algorithm())
+		assert.Equal(t, vector.Plaintext, dst, ctx.Algorithm())
+	}
+}