Hi all, I'm a student who want to implement a kernel module with the functionality of linux/crypto.h. I have read the program in the directory of testing and I try to place some code in the kernel module. But when I compile the kernel module, it prompt me that. tester2.c:125: warning: implicit declaration of function `cryptoapi_init' tester2.c:127: warning: implicit declaration of function `find_cipher_by_id' And I've tried to look for the function of "find_cipher_by_id" in the source code, but I could not find it. Would you please tell me where can I look for it. In the kernel module that I'm implementating, could you give some advices/pointers to me that I can implement the kernel module with the functionality of crypto.h. Because I've stuck for serveral days and try to solve it, but I still have no idea how can I rememdy these problems. Thanks, thanks a lot marco. Linux-crypto: cryptography in and on the Linux system Archive: http://mail.nl.linux.org/linux-crypto/