init: v1.0.0

internal/modes/doc.go

@@ -0,0 +1,5 @@
+/*
+Package modes is the block cipher's modes, ecb, cbc or others
+cbc and others are relized by go auther, so here only have ecb
+*/
+package modes

internal/modes/ecb.go

@@ -0,0 +1,90 @@
+///
+/// Copyright (c) 2018 xdx. All rights reserved.
+///
+/// \file: ecb.go
+///
+/// \brief: GO not implements the ECB modes for sefety.
+/// See: https://code.google.com/p/go/issues/detail?id=5597
+/// rsc commented on 31 May 2013
+/// Comment 1:
+/// Why? We left ECB out intentionally: it's insecure, and if needed it's
+/// trivial to implement.
+///
+/// \author: xdx
+///
+
+package modes
+
+import "crypto/cipher"
+
+type Encrypt4 interface {
+	Encrypt4(dst []byte, src []byte)
+}
+
+type Decrypt4 interface {
+	Decrypt4(dst []byte, src []byte)
+}
+
+type ecb struct {
+	b         cipher.Block
+	blockSize int
+}
+
+type ecbEncrypter ecb
+type ecbDecrypter ecb
+
+func (x *ecbEncrypter) BlockSize() int { return x.blockSize }
+func (x *ecbDecrypter) BlockSize() int { return x.blockSize }
+
+// NewECBEncrypter is the BlockMode of ECB of encrypt
+func NewECBEncrypter(b cipher.Block) cipher.BlockMode {
+	return &ecbEncrypter{b, b.BlockSize()}
+}
+
+// NewECBDecrypter is the BlockMode of ECB of decrypt
+func NewECBDecrypter(b cipher.Block) cipher.BlockMode {
+	return &ecbDecrypter{b, b.BlockSize()}
+}
+
+func (x *ecbEncrypter) CryptBlocks(dst, src []byte) {
+	if len(src)%x.blockSize != 0 {
+		panic("xdx.jelly/xgcl/sm/sm4: input not full blocks")
+	}
+	if len(dst) < len(src) {
+		panic("xdx.jelly/xgcl/sm/sm4: output smaller than input")
+	}
+	if b4, ok := x.b.(Encrypt4); ok {
+		for len(src) >= 4*x.blockSize {
+			b4.Encrypt4(dst[:x.blockSize], src[:x.blockSize])
+			src = src[4*x.blockSize:]
+			dst = dst[4*x.blockSize:]
+		}
+	}
+	for len(src) > 0 {
+		x.b.Encrypt(dst[:x.blockSize], src[:x.blockSize])
+		src = src[x.blockSize:]
+		dst = dst[x.blockSize:]
+	}
+}
+
+func (x *ecbDecrypter) CryptBlocks(dst, src []byte) {
+	if len(src)%x.blockSize != 0 {
+		panic("xdx.jelly/xgcl/sm/sm4: input not full blocks")
+	}
+	if len(dst) < len(src) {
+		panic("xdx.jelly/xgcl/sm/sm4: output smaller than input")
+	}
+	if b4, ok := x.b.(Decrypt4); ok {
+		for len(src) >= 4*x.blockSize {
+			b4.Decrypt4(dst[:x.blockSize], src[:x.blockSize])
+			src = src[4*x.blockSize:]
+			dst = dst[4*x.blockSize:]
+		}
+	}
+	for len(src) > 0 {
+		x.b.Decrypt(dst[:x.blockSize], src[:x.blockSize])
+		src = src[x.blockSize:]
+		dst = dst[x.blockSize:]
+	}
+
+}