how to use CryptoAPI in the linux kernel 2.6

Question

I have been looking for some time but have not found anywhere near sufficient documentation / examples on how to use the CryptoAPI that comes with linux in the creation of syscalls / in kernel land.

If anyone knows of a good source please let me know, I would like to know how to do SHA1 / MD5 and Blowfish / AES within the kernel space only.

Answer 1

how to do SHA1 / MD5 and Blowfish / AES within the kernel space only.

Example of hashing data using a two-element scatterlist:

struct crypto_hash *tfm = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC);
if (tfm == NULL)
    fail;
char *output_buf = kmalloc(crypto_hash_digestsize(tfm), GFP_KERNEL);
if (output_buf == NULL)
    fail;
struct scatterlist sg[2];
struct hash_desc desc = {.tfm = tfm};
ret = crypto_hash_init(&desc);
if (ret != 0)
    fail;
sg_init_table(sg, ARRAY_SIZE(sg));
sg_set_buf(&sg[0], "Hello", 5);
sg_set_buf(&sg[1], " World", 6);
ret = crypto_hash_digest(&desc, sg, 11, output_buf);
if (ret != 0)
    fail;