Xen AES库

关于Xen的AES库(转载注明出处，所有内容均为Superymk原创，版权归作者所有)

• 对应文件为xen\crypto\rijndael.h, 使用时要注意：

1. 我暂时试验过256位,其它不明
2. rijndael_ctx的enc_only设为0，除非只想加密
3. rijndael_ctx的ek，dk都是有rijndaelKeySetupEnc和rijndaelKeySetupDec生成的
4. key一定要是32字节长的
   

示例代码

• 仅用于示例，照copy肯定不能跑.

.c文件

case AES_TEST:
	{
		unsigned char key[] = "abcdefghijklmnopabcdefghijklmnop";
		unsigned char in[16] = "abcdabcdabcdabcd";
		unsigned char encrypted[32], decrypted[32];
		uint32_t cipher_enckey[4*(KEY_LEN/32+7)], cipher_deckey[4*(KEY_LEN/32+7)], i;
		rijndael_ctx ctx = {0};
		
		aes_enckey_setup(key, &cipher_enckey);
		aes_deckey_setup(key, &cipher_deckey);
	
		for(i = 0;i < 4*(KEY_LEN/32+7) ; ++i)
		{
			ctx.ek[i] = cipher_enckey[i];
			ctx.dk[i] = cipher_deckey[i];
		}
		ctx.Nr = (KEY_LEN/32)+6;
	
		rijndael_encrypt(&ctx, in, encrypted);
		encrypted[32]= '\0';
		joan_dprintk("After encryption %s\n", encrypted);
		rijndael_decrypt(&ctx, encrypted, decrypted);
		decrypted[32]='\0';
		joan_dprintk("After decryption %s\n", decrypted);
		
		break;
	}

.h文件

#include <crypto/rijndael.h>
#define KEY_LEN 256
//~ typedef u32 aes_int_key[4*(KEY_LEN/32+7)];

#define aes_enckey_setup(user_key,int_key)                 \
	    	rijndaelKeySetupEnc((u32 *)(int_key),       \
	    	                    (u8 *)(user_key), \
	    	                    KEY_LEN)
#define aes_deckey_setup(user_key,int_key)                 \
	    	rijndaelKeySetupDec((u32 *)(int_key),       \
	    	                    (u8 *)(user_key), \
	    	                    KEY_LEN)