Am Sonntag, 1. Mai 2016, 18:35:51 schrieb Gadre Nayan:
Hi Gadre,
> Hi,
>
> I wanted to implement a simple encryption decryption of data in kernel
> space to start with the kernel crypto library.
>
> I have the following:
>
> int myFunction() {
>
> struct scatterlist sg;
> struct crypto_hash *tfm;
> struct hash_desc desc;
> unsigned char input[21];
>
> pr_err("Starting Crypto hash function\n");
> strcpy(input, "12345678901234567890");
>
> tfm = crypto_alloc_hash("sha1", 0, CRYPTO_ALG_ASYNC);
>
> desc.tfm = tfm;
> desc.flags = 0;
>
> sg_init_one(&sg, input, 21);
> crypto_hash_init(&desc);
>
> crypto_hash_update(&desc, &sg, 10);
> crypto_hash_final(&desc, dataptr);
>
> crypto_free_hash(tfm);
> pr_err("Encryption done\nip: %s\nop: %s\n", input, dataptr);
>
>
> return 0;
> }
>
> So I can get this function to encrypt the data. I wanted to know how I
> can decrypt this data (dataptr) back to my original string "123....".
>
> What api's should I use.
Maybe a peek into Handbook of Applied Cryptography may help here: a hash
cannot be decrypted.
Besides the crypto_hash_* API is discouraged to be used.
Ciao
Stephan
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