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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
crypto: doc - Use ahash
This patch replaces the crypto_hash example in api-intro.txt with
crypto_ahash.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Documentation/crypto/api-intro.txt
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Documentation/crypto/api-intro.txt
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Here's an example of how to use the API:
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#include <linux/crypto.h>
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#include <crypto/ahash.h>
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#include <linux/err.h>
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#include <linux/scatterlist.h>
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struct scatterlist sg[2];
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char result[128];
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struct crypto_hash *tfm;
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struct hash_desc desc;
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struct crypto_ahash *tfm;
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struct ahash_request *req;
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tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
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tfm = crypto_alloc_ahash("md5", 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(tfm))
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fail();
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/* ... set up the scatterlists ... */
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desc.tfm = tfm;
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desc.flags = 0;
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if (crypto_hash_digest(&desc, sg, 2, result))
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req = ahash_request_alloc(tfm, GFP_ATOMIC);
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if (!req)
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fail();
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ahash_request_set_callback(req, 0, NULL, NULL);
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ahash_request_set_crypt(req, sg, result, 2);
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crypto_free_hash(tfm);
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if (crypto_ahash_digest(req))
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fail();
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ahash_request_free(req);
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crypto_free_ahash(tfm);
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Many real examples are available in the regression test module (tcrypt.c).