优化

cipher/belt/belt.go

@@ -0,0 +1,204 @@
+package belt
+
+import (
+    "fmt"
+    "crypto/cipher"
+
+    "github.com/deatil/go-cryptobin/tool/alias"
+)
+
+// BELT block cipher, defined in STB 34.101.31
+
+const BlockSize = 16
+
+// KeySizeError is returned when key size in bytes
+// isn't one of 16, 24, or 32.
+type KeySizeError int
+
+func (k KeySizeError) Error() string {
+    return fmt.Sprintf("cryptobin/belt: invalid key size %d", int(k))
+}
+
+type beltCipher struct {
+    ks [32]byte
+}
+
+// NewCipher creates and returns a new cipher.Block.
+func NewCipher(key []byte) (cipher.Block, error) {
+    k := len(key)
+    switch k {
+        case 16, 24, 32:
+            break
+        default:
+            return nil, KeySizeError(k)
+    }
+
+    c := new(beltCipher)
+    c.expandKey(key)
+
+    return c, nil
+}
+
+func (c *beltCipher) BlockSize() int {
+    return BlockSize
+}
+
+func (c *beltCipher) Encrypt(dst, src []byte) {
+    if len(src) < BlockSize {
+        panic("cryptobin/belt: input not full block")
+    }
+
+    if len(dst) < BlockSize {
+        panic("cryptobin/belt: output not full block")
+    }
+
+    if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
+        panic("cryptobin/belt: invalid buffer overlap")
+    }
+
+    c.encrypt(dst, src)
+}
+
+func (c *beltCipher) Decrypt(dst, src []byte) {
+    if len(src) < BlockSize {
+        panic("cryptobin/belt: input not full block")
+    }
+
+    if len(dst) < BlockSize {
+        panic("cryptobin/belt: output not full block")
+    }
+
+    if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
+        panic("cryptobin/belt: invalid buffer overlap")
+    }
+
+    c.decrypt(dst, src)
+}
+
+func (cc *beltCipher) encrypt(out, in []byte) {
+    var a, b, c, d, e uint32
+    var i uint32
+
+    a = getu32(in[0:])
+    b = getu32(in[4:])
+    c = getu32(in[8:])
+    d = getu32(in[12:])
+
+    ks := cc.ks
+
+    var key uint32
+
+    for i = 0; i < 8; i++ {
+        key = getu32(ks[4*KIdx[i][0]:])
+        b ^= G(a + key, 5)
+
+        key = getu32(ks[4*KIdx[i][1]:])
+        c ^= G(d + key, 21)
+
+        key = getu32(ks[4*KIdx[i][2]:])
+        a = (a - G(b + key, 13))
+
+        key = getu32(ks[4*KIdx[i][3]:])
+        e = G(b + c + key, 21) ^ (i + 1)
+
+        b += e
+        c = uint32(c - e)
+
+        key = getu32(ks[4*KIdx[i][4]:])
+        d += G(c + key, 13)
+
+        key = getu32(ks[4*KIdx[i][5]:])
+        b ^= G(a + key, 21)
+
+        key = getu32(ks[4*KIdx[i][6]:])
+        c ^= G(d + key, 5)
+
+        a, b = b, a
+        c, d = d, c
+        b, c = c, b
+    }
+
+    putu32(out[0:], b)
+    putu32(out[4:], d)
+    putu32(out[8:], a)
+    putu32(out[12:], c)
+}
+
+func (cc *beltCipher) decrypt(out, in []byte) {
+    var a, b, c, d, e uint32
+    var i uint32
+
+    a = getu32(in[0:])
+    b = getu32(in[4:])
+    c = getu32(in[8:])
+    d = getu32(in[12:])
+
+    ks := cc.ks
+
+    for i = 0; i < 8; i++ {
+        var key uint32
+
+        j := 7 - i
+
+        key = getu32(ks[4*KIdx[j][6]:])
+        b ^= G(a + key, 5)
+
+        key = getu32(ks[4*KIdx[j][5]:])
+        c ^= G(d + key, 21)
+
+        key = getu32(ks[4*KIdx[j][4]:])
+        a = uint32(a - G(b + key, 13))
+
+        key = getu32(ks[4*KIdx[j][3]:])
+        e = G(b + c + key, 21) ^ (j + 1)
+
+        b += e
+        c = uint32(c - e)
+
+        key = getu32(ks[4*KIdx[j][2]:])
+        d += G(c + key, 13)
+
+        key = getu32(ks[4*KIdx[j][1]:])
+        b ^= G(a + key, 21)
+
+        key = getu32(ks[4*KIdx[j][0]:])
+        c ^= G(d + key, 5)
+
+        a, b = b, a
+        c, d = d, c
+        a, d = d, a
+    }
+
+    putu32(out[0:], c)
+    putu32(out[4:], a)
+    putu32(out[8:], d)
+    putu32(out[12:], b)
+}
+
+func (c *beltCipher) expandKey(k []byte) {
+    var i int
+
+    kLen := len(k)
+
+    switch (kLen) {
+        case 16:
+            for i = 0; i < 16; i++ {
+                c.ks[i]      = k[i]
+                c.ks[i + 16] = k[i]
+            }
+
+        case 24:
+            for i = 0; i < 24; i++ {
+                c.ks[i] = k[i]
+            }
+
+            for i = 24; i < 32; i++ {
+                c.ks[i] = k[i - 24] ^ k[i - 20] ^ k[i - 16]
+            }
+
+        case 32:
+            for i = 0; i < 32; i++ {
+                c.ks[i] = k[i]
+            }
+    }
+}

cipher/belt/belt_test.go

@@ -0,0 +1,125 @@
+package belt
+
+import (
+    "bytes"
+    "testing"
+    "math/rand"
+    "encoding/hex"
+)
+
+func fromHex(s string) []byte {
+    h, _ := hex.DecodeString(s)
+    return h
+}
+
+func Test_Key(t *testing.T) {
+    random := rand.New(rand.NewSource(99))
+    max := 100
+
+    var encrypted [16]byte
+    var decrypted [16]byte
+
+    for i := 0; i < max; i++ {
+        key := make([]byte, 32)
+        random.Read(key)
+        value := make([]byte, 16)
+        random.Read(value)
+
+        cipher1, err := NewCipher(key)
+        if err != nil {
+            t.Fatal(err.Error())
+        }
+
+        cipher1.Encrypt(encrypted[:], value)
+
+        cipher2, err := NewCipher(key)
+        if err != nil {
+            t.Fatal(err.Error())
+        }
+
+        cipher2.Decrypt(decrypted[:], encrypted[:])
+
+        if !bytes.Equal(decrypted[:], value[:]) {
+            t.Errorf("encryption/decryption failed: got %x, want %x", decrypted, value)
+        }
+    }
+}
+
+type testData struct {
+    pt []byte
+    ct []byte
+    key []byte
+}
+
+func Test_Check_List(t *testing.T) {
+   tests := []testData{
+        // 32 bytes
+        {
+           fromHex("000000000000000000000000bdf4e311"),
+           fromHex("74bc468e2d40f5839633370e7d67bd23"),
+           fromHex("2342bb9efa38542cbed0ac83940ac2988d7c47ce264908461cc1b5137ae6b604"),
+        },
+        {
+           fromHex("000000000000000000000000cf05f422"),
+           fromHex("05ceae72f09bc0d7dfa4978903a5c936"),
+           fromHex("2342bb9efa38542cbed0ac83940ac2988d7c47ce264908461cc1b5137ae6b604"),
+        },
+        {
+           fromHex("000000000000000000000000f0271543"),
+           fromHex("47b67fd2f8a41cf50f6526d874f9e692"),
+           fromHex("2342bb9efa38542cbed0ac83940ac2988d7c47ce264908461cc1b5137ae6b604"),
+        },
+
+        // 24 bytes
+        {
+           fromHex("000000000000000000000000de255aff"),
+           fromHex("312de1e84c285f8a4c3ee45de9a8bacc"),
+           fromHex("2342bb9efa38542cbed0ac83940ac298bac77a7717942863"),
+        },
+        {
+           fromHex("000000000000000000000000e2295f03"),
+           fromHex("79172557ae7da54f7d5adb4dcb0ec0d3"),
+           fromHex("2342bb9efa38542cbed0ac83940ac298bac77a7717942863"),
+        },
+
+        // 16 bytes
+        {
+           fromHex("0000000000000000000000000c9b2807"),
+           fromHex("c362d0c8e930486e00df76023439047d"),
+           fromHex("2342bb9efa38542c0af75647f29f615d"),
+        },
+        {
+           fromHex("0000000000000000000000002cbb4827"),
+           fromHex("98c02f6582e88b61ed3e0235a361c18a"),
+           fromHex("2342bb9efa38542c0af75647f29f615d"),
+        },
+    }
+
+    for i, test := range tests {
+        c, err := NewCipher(test.key)
+        if err != nil {
+            t.Fatal(err.Error())
+        }
+
+        tmp := make([]byte, BlockSize)
+        c.Encrypt(tmp, test.pt)
+
+        if !bytes.Equal(tmp, test.ct) {
+            t.Errorf("[%d] Check error: got %x, want %x", i, tmp, test.ct)
+        }
+
+        // ===========
+
+        c2, err := NewCipher(test.key)
+        if err != nil {
+            t.Fatal(err.Error())
+        }
+
+        tmp2 := make([]byte, BlockSize)
+        c2.Decrypt(tmp2, test.ct)
+
+        if !bytes.Equal(tmp2, test.pt) {
+            t.Errorf("[%d] Check Decrypt error: got %x, want %x", i, tmp2, test.pt)
+        }
+    }
+}

cipher/belt/sboxs.go

@@ -0,0 +1,31 @@
+package belt
+
+var S = [256]byte{
+    0xB1, 0x94, 0xBA, 0xC8, 0x0A, 0x08, 0xF5, 0x3B, 0x36, 0x6D, 0x00, 0x8E, 0x58, 0x4A, 0x5D, 0xE4,
+    0x85, 0x04, 0xFA, 0x9D, 0x1B, 0xB6, 0xC7, 0xAC, 0x25, 0x2E, 0x72, 0xC2, 0x02, 0xFD, 0xCE, 0x0D,
+    0x5B, 0xE3, 0xD6, 0x12, 0x17, 0xB9, 0x61, 0x81, 0xFE, 0x67, 0x86, 0xAD, 0x71, 0x6B, 0x89, 0x0B,
+    0x5C, 0xB0, 0xC0, 0xFF, 0x33, 0xC3, 0x56, 0xB8, 0x35, 0xC4, 0x05, 0xAE, 0xD8, 0xE0, 0x7F, 0x99,
+    0xE1, 0x2B, 0xDC, 0x1A, 0xE2, 0x82, 0x57, 0xEC, 0x70, 0x3F, 0xCC, 0xF0, 0x95, 0xEE, 0x8D, 0xF1,
+    0xC1, 0xAB, 0x76, 0x38, 0x9F, 0xE6, 0x78, 0xCA, 0xF7, 0xC6, 0xF8, 0x60, 0xD5, 0xBB, 0x9C, 0x4F,
+    0xF3, 0x3C, 0x65, 0x7B, 0x63, 0x7C, 0x30, 0x6A, 0xDD, 0x4E, 0xA7, 0x79, 0x9E, 0xB2, 0x3D, 0x31,
+    0x3E, 0x98, 0xB5, 0x6E, 0x27, 0xD3, 0xBC, 0xCF, 0x59, 0x1E, 0x18, 0x1F, 0x4C, 0x5A, 0xB7, 0x93,
+    0xE9, 0xDE, 0xE7, 0x2C, 0x8F, 0x0C, 0x0F, 0xA6, 0x2D, 0xDB, 0x49, 0xF4, 0x6F, 0x73, 0x96, 0x47,
+    0x06, 0x07, 0x53, 0x16, 0xED, 0x24, 0x7A, 0x37, 0x39, 0xCB, 0xA3, 0x83, 0x03, 0xA9, 0x8B, 0xF6,
+    0x92, 0xBD, 0x9B, 0x1C, 0xE5, 0xD1, 0x41, 0x01, 0x54, 0x45, 0xFB, 0xC9, 0x5E, 0x4D, 0x0E, 0xF2,
+    0x68, 0x20, 0x80, 0xAA, 0x22, 0x7D, 0x64, 0x2F, 0x26, 0x87, 0xF9, 0x34, 0x90, 0x40, 0x55, 0x11,
+    0xBE, 0x32, 0x97, 0x13, 0x43, 0xFC, 0x9A, 0x48, 0xA0, 0x2A, 0x88, 0x5F, 0x19, 0x4B, 0x09, 0xA1,
+    0x7E, 0xCD, 0xA4, 0xD0, 0x15, 0x44, 0xAF, 0x8C, 0xA5, 0x84, 0x50, 0xBF, 0x66, 0xD2, 0xE8, 0x8A,
+    0xA2, 0xD7, 0x46, 0x52, 0x42, 0xA8, 0xDF, 0xB3, 0x69, 0x74, 0xC5, 0x51, 0xEB, 0x23, 0x29, 0x21,
+    0xD4, 0xEF, 0xD9, 0xB4, 0x3A, 0x62, 0x28, 0x75, 0x91, 0x14, 0x10, 0xEA, 0x77, 0x6C, 0xDA, 0x1D,
+}
+
+var KIdx = [8][7]uint32{
+    { 0, 1, 2, 3, 4, 5, 6 },
+    { 7, 0, 1, 2, 3, 4, 5 },
+    { 6, 7, 0, 1, 2, 3, 4 },
+    { 5, 6, 7, 0, 1, 2, 3 },
+    { 4, 5, 6, 7, 0, 1, 2 },
+    { 3, 4, 5, 6, 7, 0, 1 },
+    { 2, 3, 4, 5, 6, 7, 0 },
+    { 1, 2, 3, 4, 5, 6, 7 },
+}