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authorEric Biggers <ebiggers@google.com>2020-05-01 22:31:03 -0700
committerHerbert Xu <herbert@gondor.apana.org.au>2020-05-08 15:32:12 +1000
commit822a98b862d5b511826765d64ddf18192fc5b694 (patch)
tree292c80ad704e481f41ad14cedf96abe8d918012f /crypto
parent13855fd8ce641e567c1b972048b5fd1451984e88 (diff)
downloadlwn-822a98b862d5b511826765d64ddf18192fc5b694.tar.gz
lwn-822a98b862d5b511826765d64ddf18192fc5b694.zip
crypto: hash - introduce crypto_shash_tfm_digest()
Currently the simplest use of the shash API is to use crypto_shash_digest() to digest a whole buffer. However, this still requires allocating a hash descriptor (struct shash_desc). Many users don't really want to preallocate one and instead just use a one-off descriptor on the stack like the following: { SHASH_DESC_ON_STACK(desc, tfm); int err; desc->tfm = tfm; err = crypto_shash_digest(desc, data, len, out); shash_desc_zero(desc); } Wrap this in a new helper function crypto_shash_tfm_digest() that can be used instead of the above. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/shash.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/crypto/shash.c b/crypto/shash.c
index c075b26c2a1d..e6a4b5f39b8c 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -206,6 +206,22 @@ int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
}
EXPORT_SYMBOL_GPL(crypto_shash_digest);
+int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
+ unsigned int len, u8 *out)
+{
+ SHASH_DESC_ON_STACK(desc, tfm);
+ int err;
+
+ desc->tfm = tfm;
+
+ err = crypto_shash_digest(desc, data, len, out);
+
+ shash_desc_zero(desc);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(crypto_shash_tfm_digest);
+
static int shash_default_export(struct shash_desc *desc, void *out)
{
memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));