修改了加密算法

9.6.md

@@ -54,40 +54,51 @@ Go语言的`crypto`里面支持对称加密的高级加解密包有：
 
 	package main
 
-    import (
-    	"crypto/aes"
-    	. "fmt"
-    	"os"
-    )
+	import (
+		"crypto/aes"
+		"crypto/cipher"
+		"fmt"
+		"os"
+	)
 
-    func main() {
-    	msg := "My name is Astaxie"
-    	// some key, 16 Byte long
-    	key := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f}
+	var commonIV = []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f}
 
-    	Println("len of message: ", len(msg))
-    	Println("len of key: ", len(key))
-    	// create the new cipher
-    	c, err := aes.NewCipher(key)
-    	if err != nil {
-    		Println("Error: NewCipher(%d bytes) = %s", len(key), err)
-    		os.Exit(-1)
-    	}
+	func main() {
+		//需要去加密的字符串
+		plaintext := []byte("My name is Astaxie")
+		//如果传入加密串的话，plaint就是传入的字符串
+		if len(os.Args) > 1 {
+			plaintext = []byte(os.Args[1])
+		}
 
-    	out := make([]byte, len(msg))
+		//aes的加密字符串
+		key_text := "astaxie12798akljzmknm.ahkjkljl;k"
+		if len(os.Args) > 2 {
+			key_text = os.Args[2]
+		}
 
-    	c.Encrypt(out, []byte(msg)) // encrypt the first half
-    	//c.Encrypt(msgbuf[16:32], out[16:32]) // encrypt the second half
+		fmt.Println(len(key_text))
 
-    	Println("len of encrypted: ", len(out))
-    	Println(">> ", out)
+		// 创建加密算法aes
+		c, err := aes.NewCipher([]byte(key_text))
+		if err != nil {
+			fmt.Printf("Error: NewCipher(%d bytes) = %s", len(key_text), err)
+			os.Exit(-1)
+		}
 
-    	// // now we decrypt our encrypted text
-    	plain := make([]byte, len(out))
-    	c.Decrypt(plain, out)
+		//加密字符串
+		cfb := cipher.NewCFBEncrypter(c, commonIV)
+		ciphertext := make([]byte, len(plaintext))
+		cfb.XORKeyStream(ciphertext, plaintext)
+		fmt.Printf("%s=>%x\n", plaintext, ciphertext)
+
+		// 加密字符串
+		cfbdec := cipher.NewCFBDecrypter(c, commonIV)
+		plaintextCopy := make([]byte, len(plaintext))
+		cfbdec.XORKeyStream(plaintextCopy, ciphertext)
+		fmt.Printf("%x=>%s\n", ciphertext, plaintextCopy)
+	}
 
-    	Println("msg: ", string(plain))
-    }
 
 上面通过调用函数`aes.NewCipher`(参数key必须是16、24或者32位的[]byte，分别对应AES-128, AES-192或AES-256算法),返回了一个`cipher.Block`接口，这个接口实现了三个功能：