Documentation/crypto/api-samples.rst

1 Code Examples
4 Code Example For Symmetric Key Cipher Operation
5 -----------------------------------------------
7 This code encrypts some data with AES-256-XTS.  For sake of example,
8 all inputs are random bytes, the encryption is done in-place, and it's
9 assumed the code is running in a context where it can sleep.
21             u8 iv[16];  /* AES-256-XTS takes a 16-byte IV */
22             u8 key[64]; /* AES-256-XTS takes a 64-byte key */
26              * Allocate a tfm (a transformation object) and set the key.
28              * In real-world use, a tfm and key are typically used for many
39             get_random_bytes(key, sizeof(key));
40             err = crypto_skcipher_setkey(tfm, key, sizeof(key));
42                     pr_err("Error setting key: %d\n", err);
49                     err = -ENOMEM;
56                     err = -ENOMEM;
65              * Encrypt the data in-place.
93 Code Example For Use of Operational State Memory With SHASH
94 -----------------------------------------------------------
112             return ERR_PTR(-ENOMEM);
113         sdesc->shash.tfm = alg;
130         ret = crypto_shash_digest(&sdesc->shash, data, datalen, digest);
139         char *hash_alg_name = "sha1-padlock-nano";
153 Code Example For Random Number Generator Usage
154 ----------------------------------------------
162         char *drbg = "drbg_nopr_sha256"; /* Hash DRBG with SHA-256, no PR */
167             return -EINVAL;