AES Encryption Error: Unknown symbol crypto_alloc_base

GoogleGroups
1

Hi,
I am trying to achieve AES encryption in one of my kernel module
(Linux version 2.6.34), but during insmod I got error :
"aestest: Unknown symbol crypto_alloc_base
insmod: error inserting 'aestest.ko': -1 Unknown symbol in module"

I am using beagleboard-XM RevC and AES encryption is enable in my
kernel. Giving below my test code for your confirmation and test.

My kernel source file :aestest.c

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/crypto.h>
#define ALG_CCMP_KEY_LEN 16
    int init_module(void)
    {
        struct crypto_cipher *tfm;
        const u8 key[16]= "my key";
        u8 in[20] ="I Love India";
        u8 encrypted[200];
        u8 decrypted[200];
        printk(KERN_INFO ">>>>>>>>aesModule Insmoded>>>>>>>>\n");
        printk(KERN_INFO ">>>>>>>>Plain:%s \n",in);
        tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);

        //if (!IS_ERR(tfm))
                crypto_cipher_setkey(tfm, key, ALG_CCMP_KEY_LEN);

        crypto_cipher_encrypt_one(tfm, encrypted, in);
        printk(KERN_INFO ">>>>Encrypted :%s \n",encrypted);
        crypto_cipher_decrypt_one(tfm, decrypted, encrypted);
        printk(KERN_INFO ">>>>Decrypted :%s \n ",decrypted);
        return 0;
    }

    void cleanup_module(void)
    {
        printk(KERN_INFO ">>>>>>>>aesModule Removed>>>>>>>>\n");
    }

My Makefile:

obj-m += aesTest.o
KDIR := /home/barun/try-kernel/

all:
  make -C $(KDIR) M=$(PWD) modules

clean:
  make -C $(KDIR) M=$(PWD) clean

Compile as :

make ARCH=arm CROSS_COMPILE=arm-angstrom-linux-gnueabi-

insmod the module

#insmod aestest.ko
aestest: Unknown symbol crypto_alloc_base
insmod: error inserting 'aestest.ko': -1 Unknown symbol in module

Any help will be appreciated.
Regards,
Barun Parichha

2

barun parichha wrote:

Hi,
I am trying to achieve AES encryption in one of my kernel module
(Linux version 2.6.34), but during insmod I got error :
"aestest: Unknown symbol crypto_alloc_base
insmod: error inserting 'aestest.ko': -1 Unknown symbol in module"

http://docs.blackfin.uclinux.org/kernel/generated/kernel-hacking/ch09s02.html

3

Thanks to Vladimir Pantelic for his quickest response.
After adding below lines to the end of my module, it started working.

MODULE_LICENSE(“GPL”);
MODULE_DESCRIPTION(“Barun code for aes encryption test”);
MODULE_AUTHOR(“Barun Parichha<barun.parichha@gmail.com>”);
MODULE_ALIAS(“test”);

Regards,
Barun Parichha