}
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));
unsigned int len, u8 *out);
/**
+ * crypto_shash_tfm_digest() - calculate message digest for buffer
+ * @tfm: hash transformation object
+ * @data: see crypto_shash_update()
+ * @len: see crypto_shash_update()
+ * @out: see crypto_shash_final()
+ *
+ * This is a simplified version of crypto_shash_digest() for users who don't
+ * want to allocate their own hash descriptor (shash_desc). Instead,
+ * crypto_shash_tfm_digest() takes a hash transformation object (crypto_shash)
+ * directly, and it allocates a hash descriptor on the stack internally.
+ * Note that this stack allocation may be fairly large.
+ *
+ * Context: Any context.
+ * Return: 0 on success; < 0 if an error occurred.
+ */
+int crypto_shash_tfm_digest(struct crypto_shash *tfm, const u8 *data,
+ unsigned int len, u8 *out);
+
+/**
* crypto_shash_export() - extract operational state for message digest
* @desc: reference to the operational state handle whose state is exported
* @out: output buffer of sufficient size that can hold the hash state