init: v1.0.0

sm/sm1/cipher.go

@@ -0,0 +1,64 @@
+package sm1
+
+import (
+	"crypto/cipher"
+
+	"xdx.jelly/xgcl/gerrors"
+)
+
+// BlockSize is the SM1 block size in bytes.
+const (
+	BlockSize  = 16
+	numOfRound = 8
+)
+
+// sm1Cipher is an instance of cipher.Block interface
+type sm1Cipher struct {
+	encKey [4 * (numOfRound + 1)]uint32
+	decKey [4 * (numOfRound + 1)]uint32
+}
+
+// NewCipher creates and returns a new cipher.Block.
+func NewCipher(key []byte) (cipher.Block, error) {
+	if len(key) != BlockSize {
+		return nil, gerrors.WithAnnotatingf(ErrInvalidInputLength, "key should be %d bytes", BlockSize)
+	}
+
+	cp := new(sm1Cipher)
+	// gen keys
+	keyexpand_enc(cp.encKey[:], key)
+	keyexpand_dec(cp.decKey[:], key)
+
+	return cp, nil
+}
+
+// Clear implements the gmath.Clearable interface
+func (c *sm1Cipher) Clear() {
+	for i := 0; i < len(c.decKey); i++ {
+		c.decKey[i] = 0
+		c.encKey[i] = 0
+	}
+}
+
+func (c *sm1Cipher) BlockSize() int { return BlockSize }
+
+// 调用前应保证输入一个block
+func (c *sm1Cipher) Encrypt(dst, src []byte) {
+	if len(src) < BlockSize {
+		panic("xdx.jelly/xgcl/sm/sm1/Encrypt: input not full block")
+	}
+	if len(dst) < BlockSize {
+		panic("xdx.jelly/xgcl/sm/sm1/Encrypt: output not full block")
+	}
+	encryptBlock(dst, src, c.encKey[:])
+}
+
+func (c *sm1Cipher) Decrypt(dst, src []byte) {
+	if len(src) < BlockSize {
+		panic("xdx.jelly/xgcl/sm/sm1/Decrypt: input not full block")
+	}
+	if len(dst) < BlockSize {
+		panic("xdx.jelly/xgcl/sm/sm1/Decrypt: output not full block")
+	}
+	decryptBlock(dst, src, c.decKey[:])
+}