How to use kernel crypto

[freeman.zhang1992@gmail.com (Freeman Zhang)]

Hi list,

Recently I'm learning to use kernel crypto. I find some examples but
they are out of date.
I manage to write a test program, trying to use aes to encrypt 'buf'
,but something goes wrong:

struct scatterlist sg;
struct crypto_blkcipher *tfm;
struct blkcipher_desc desc;
unsigned char buf[10];
char *key = "00112233445566778899aabbccddeeff";
int keylen = 16;

memset(buf, 'A', 10);
tfm = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC);
crypto_blkcipher_setkey(tfm,key,keylen);
desc.tfm = tfm;
desc.flags = 1;
sg_init_one(&sg, buf, 10);
crypto_blkcipher_encrypt(&desc, &sg, &sg, 10);
sg_set_buf(&sg, buf,10);
hexdump(buf,10);

The result of hexdump(buf) shows that 'buf' stay unchanged. What should
I do to encrypt the buffer?


All the best!
Freeman Zhang