Hi,
I am getting error during enc/dec of data with CFB and CTR mode, while CBC,ECB works fine. The test code is given below what changes need to be done. please help.
int init_module (void)
{
char Input[]={0xaa,0xbb,0xcc,0xdd,0xee,0xff,0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00};
tfm_crypto = crypto_alloc_tfm ("aes", CRYPTO_TFM_MODE_CFB);
if (tfm_crypto == NULL)
{
printk (KERN_ALERT "<1> The cipher algo not supported\n");
goto err;
}
printk (KERN_ALERT "Module Loaded successfully\n");
hexprint(Input,sizeof(Input),"PlnTxt");
my_en_de_crypt(0,Input,sizeof(Input));
hexprint(Input,sizeof(Input),"CprTxt");
my_en_de_crypt(1,Input, sizeof(Input));
hexprint(Input,sizeof(Input),"PlnTxt");
err:
return 0;
}
void my_en_de_crypt(int flag,char *Input, int buflen)
{
int ret;
struct scatterlist sg;
char *tempptr;
char Key[] = {0xaa,0xbb,0xcc,0xdd,0xee,0xff,0x1,0x2,0x3,0x4,0x5,0x6,0x7,0x8,0x1a,0x2b};
char IV[] = {0xa2,0xfb,0x3c,0x4d,0x5e,0x6f,0x71,0x8,0x9,0x4,0xd,0xf,0xe,0xb,0x13,0x2e};
ret = crypto_cipher_setkey (tfm_crypto,Key,sizeof(Key));
if (ret)
{
printk ("setkey() failed flags=%x\n", tfm_crypto->crt_flags);
return;
}
sg_init_one (&sg, Input, buflen);
crypto_cipher_set_iv (tfm_crypto, IV, crypto_tfm_alg_ivsize(tfm_crypto));
if(!flag)
ret = crypto_cipher_encrypt (tfm_crypto, &sg, &sg, buflen);
else
ret = crypto_cipher_decrypt (tfm_crypto, &sg, &sg, buflen);
tempptr = kmap (sg.page) + sg.offset;
memcpy(Input, tempptr, buflen);
if (ret)
{
printk ("%s failed \n", (flag == 0) ? "Encryption" : "Decryption");
}
return;
}
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