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 I find some examples but they are out of date.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