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crypto: doc - Fixed bugs, added example usage of calc_hash(). 

- Fixed bugs in example for shash and rng (added missing "*" and " *").
- Corrected pr_info() in calc_hash().
- Added example usage of calc_hash().
- No need for negate PTR_ERR to get error code, as crypto_alloc_rng
  already returns negative values like ERR_PTR(-ENOMEM). Fixed.

Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
hifive-unleashed-5.1
Kamil Konieczny 2017-05-12 17:38:02 +02:00 committed by Herbert Xu
parent 8270f5d799
commit ea644b8ca4
1 changed files with 28 additions and 10 deletions
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38
Documentation/crypto/api-samples.rst
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@ -155,9 +155,9 @@ Code Example For Use of Operational State Memory With SHASH
char ctx[];
};
static struct sdesc init_sdesc(struct crypto_shash *alg)
static struct sdesc *init_sdesc(struct crypto_shash *alg)
{
struct sdesc sdesc;
struct sdesc *sdesc;
int size;
size = sizeof(struct shash_desc) + crypto_shash_descsize(alg);
@ -169,15 +169,16 @@ Code Example For Use of Operational State Memory With SHASH
return sdesc;
}
static int calc_hash(struct crypto_shashalg,
const unsigned chardata, unsigned int datalen,
unsigned chardigest) {
struct sdesc sdesc;
static int calc_hash(struct crypto_shash *alg,
const unsigned char *data, unsigned int datalen,
unsigned char *digest)
{
struct sdesc *sdesc;
int ret;
sdesc = init_sdesc(alg);
if (IS_ERR(sdesc)) {
pr_info("trusted_key: can't alloc %s\n", hash_alg);
pr_info("can't alloc sdesc\n");
return PTR_ERR(sdesc);
}
@ -186,6 +187,23 @@ Code Example For Use of Operational State Memory With SHASH
return ret;
}
static int test_hash(const unsigned char *data, unsigned int datalen,
unsigned char *digest)
{
struct crypto_shash *alg;
char *hash_alg_name = "sha1-padlock-nano";
int ret;
alg = crypto_alloc_shash(hash_alg_name, CRYPTO_ALG_TYPE_SHASH, 0);
if (IS_ERR(alg)) {
pr_info("can't alloc alg %s\n", hash_alg_name);
return PTR_ERR(alg);
}
ret = calc_hash(alg, data, datalen, digest);
crypto_free_shash(alg);
return ret;
}
Code Example For Random Number Generator Usage
----------------------------------------------
@ -195,8 +213,8 @@ Code Example For Random Number Generator Usage
static int get_random_numbers(u8 *buf, unsigned int len)
{
struct crypto_rngrng = NULL;
chardrbg = "drbg_nopr_sha256"; /* Hash DRBG with SHA-256, no PR */
struct crypto_rng *rng = NULL;
char *drbg = "drbg_nopr_sha256"; /* Hash DRBG with SHA-256, no PR */
int ret;
if (!buf || !len) {
@ -207,7 +225,7 @@ Code Example For Random Number Generator Usage
rng = crypto_alloc_rng(drbg, 0, 0);
if (IS_ERR(rng)) {
pr_debug("could not allocate RNG handle for %s\n", drbg);
return -PTR_ERR(rng);
return PTR_ERR(rng);
}
ret = crypto_rng_get_bytes(rng, buf, len);