Am Sonntag, 1. Mai 2016, 19:05:12 schrieb Gadre Nayan: Hi Gadre, > Yes, i was reading about that till your reply came. > > So then if not hash...then should I use asymmetric or symmetric key APIs. > > My kernel version is 3.19, what APIs can I use which can compile with this > kernel version. > > The latest kernel 4.5 has skcipher fully implemented but I need to work > with 3.19. Please read the kernel crypto API documentation: http://www.chronox.de/crypto-API/index.html > > Thanks > > On 1 May 2016 6:54 p.m., "Stephan Mueller" <smueller@xxxxxxxxxx> wrote: > > 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 Ciao Stephan -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
