docs: crypto: convert api-intro.txt to ReST format
- Change title markups; - Mark literal blocks; - Use list markups at authors/credits; - Add blank lines when needed; - Remove trailing whitespaces. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Link: https://lore.kernel.org/r/c71e2c73a787ec7814db09bec3c1359779785bfa.1592203650.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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Mauro Carvalho Chehab
Jonathan Corbet
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@ -1,7 +1,11 @@
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.. SPDX-License-Identifier: GPL-2.0
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Scatterlist Cryptographic API
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INTRODUCTION
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=============================
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Scatterlist Cryptographic API
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=============================
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Introduction
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============
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The Scatterlist Crypto API takes page vectors (scatterlists) as
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arguments, and works directly on pages. In some cases (e.g. ECB
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@ -13,22 +17,23 @@ so that processing can be applied to paged skb's without the need
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for linearization.
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DETAILS
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Details
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=======
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At the lowest level are algorithms, which register dynamically with the
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API.
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'Transforms' are user-instantiated objects, which maintain state, handle all
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of the implementation logic (e.g. manipulating page vectors) and provide an
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abstraction to the underlying algorithms. However, at the user
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of the implementation logic (e.g. manipulating page vectors) and provide an
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abstraction to the underlying algorithms. However, at the user
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level they are very simple.
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Conceptually, the API layering looks like this:
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Conceptually, the API layering looks like this::
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[transform api] (user interface)
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[transform ops] (per-type logic glue e.g. cipher.c, compress.c)
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[algorithm api] (for registering algorithms)
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The idea is to make the user interface and algorithm registration API
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very simple, while hiding the core logic from both. Many good ideas
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from existing APIs such as Cryptoapi and Nettle have been adapted for this.
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@ -44,21 +49,21 @@ one block while the former can operate on an arbitrary amount of data,
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subject to block size requirements (i.e., non-stream ciphers can only
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process multiples of blocks).
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Here's an example of how to use the API:
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Here's an example of how to use the API::
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#include <crypto/hash.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_ahash *tfm;
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struct ahash_request *req;
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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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req = ahash_request_alloc(tfm, GFP_ATOMIC);
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@ -67,18 +72,19 @@ Here's an example of how to use the API:
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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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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).
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DEVELOPER NOTES
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Developer Notes
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===============
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Transforms may only be allocated in user context, and cryptographic
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methods may only be called from softirq and user contexts. For
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@ -91,7 +97,8 @@ size (typically 8 bytes). This prevents having to do any copying
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across non-aligned page fragment boundaries.
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ADDING NEW ALGORITHMS
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Adding New Algorithms
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=====================
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When submitting a new algorithm for inclusion, a mandatory requirement
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is that at least a few test vectors from known sources (preferably
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@ -119,132 +126,137 @@ Also check the TODO list at the web site listed below to see what people
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might already be working on.
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BUGS
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Bugs
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====
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Send bug reports to:
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linux-crypto@vger.kernel.org
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Cc: Herbert Xu <herbert@gondor.apana.org.au>,
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linux-crypto@vger.kernel.org
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Cc:
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Herbert Xu <herbert@gondor.apana.org.au>,
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David S. Miller <davem@redhat.com>
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FURTHER INFORMATION
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Further Information
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===================
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For further patches and various updates, including the current TODO
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list, see:
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http://gondor.apana.org.au/~herbert/crypto/
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AUTHORS
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Authors
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=======
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James Morris
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David S. Miller
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Herbert Xu
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- James Morris
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- David S. Miller
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- Herbert Xu
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CREDITS
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Credits
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=======
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The following people provided invaluable feedback during the development
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of the API:
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Alexey Kuznetzov
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Rusty Russell
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Herbert Valerio Riedel
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Jeff Garzik
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Michael Richardson
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Andrew Morton
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Ingo Oeser
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Christoph Hellwig
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- Alexey Kuznetzov
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- Rusty Russell
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- Herbert Valerio Riedel
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- Jeff Garzik
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- Michael Richardson
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- Andrew Morton
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- Ingo Oeser
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- Christoph Hellwig
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Portions of this API were derived from the following projects:
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Kerneli Cryptoapi (http://www.kerneli.org/)
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Alexander Kjeldaas
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Herbert Valerio Riedel
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Kyle McMartin
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Jean-Luc Cooke
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David Bryson
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Clemens Fruhwirth
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Tobias Ringstrom
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Harald Welte
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- Alexander Kjeldaas
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- Herbert Valerio Riedel
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- Kyle McMartin
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- Jean-Luc Cooke
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- David Bryson
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- Clemens Fruhwirth
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- Tobias Ringstrom
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- Harald Welte
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and;
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Nettle (http://www.lysator.liu.se/~nisse/nettle/)
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Niels Möller
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- Niels Möller
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Original developers of the crypto algorithms:
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Dana L. How (DES)
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Andrew Tridgell and Steve French (MD4)
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Colin Plumb (MD5)
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Steve Reid (SHA1)
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Jean-Luc Cooke (SHA256, SHA384, SHA512)
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Kazunori Miyazawa / USAGI (HMAC)
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Matthew Skala (Twofish)
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Dag Arne Osvik (Serpent)
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Brian Gladman (AES)
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Kartikey Mahendra Bhatt (CAST6)
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Jon Oberheide (ARC4)
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Jouni Malinen (Michael MIC)
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NTT(Nippon Telegraph and Telephone Corporation) (Camellia)
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- Dana L. How (DES)
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- Andrew Tridgell and Steve French (MD4)
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- Colin Plumb (MD5)
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- Steve Reid (SHA1)
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- Jean-Luc Cooke (SHA256, SHA384, SHA512)
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- Kazunori Miyazawa / USAGI (HMAC)
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- Matthew Skala (Twofish)
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- Dag Arne Osvik (Serpent)
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- Brian Gladman (AES)
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- Kartikey Mahendra Bhatt (CAST6)
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- Jon Oberheide (ARC4)
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- Jouni Malinen (Michael MIC)
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- NTT(Nippon Telegraph and Telephone Corporation) (Camellia)
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SHA1 algorithm contributors:
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Jean-Francois Dive
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- Jean-Francois Dive
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DES algorithm contributors:
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Raimar Falke
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Gisle Sælensminde
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Niels Möller
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- Raimar Falke
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- Gisle Sælensminde
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- Niels Möller
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Blowfish algorithm contributors:
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Herbert Valerio Riedel
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Kyle McMartin
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- Herbert Valerio Riedel
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- Kyle McMartin
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Twofish algorithm contributors:
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Werner Koch
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Marc Mutz
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- Werner Koch
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- Marc Mutz
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SHA256/384/512 algorithm contributors:
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Andrew McDonald
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Kyle McMartin
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Herbert Valerio Riedel
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- Andrew McDonald
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- Kyle McMartin
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- Herbert Valerio Riedel
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AES algorithm contributors:
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Alexander Kjeldaas
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Herbert Valerio Riedel
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Kyle McMartin
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Adam J. Richter
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Fruhwirth Clemens (i586)
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Linus Torvalds (i586)
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- Alexander Kjeldaas
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- Herbert Valerio Riedel
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- Kyle McMartin
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- Adam J. Richter
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- Fruhwirth Clemens (i586)
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- Linus Torvalds (i586)
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CAST5 algorithm contributors:
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Kartikey Mahendra Bhatt (original developers unknown, FSF copyright).
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- Kartikey Mahendra Bhatt (original developers unknown, FSF copyright).
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TEA/XTEA algorithm contributors:
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Aaron Grothe
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Michael Ringe
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- Aaron Grothe
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- Michael Ringe
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Khazad algorithm contributors:
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Aaron Grothe
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- Aaron Grothe
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Whirlpool algorithm contributors:
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Aaron Grothe
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Jean-Luc Cooke
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- Aaron Grothe
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- Jean-Luc Cooke
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Anubis algorithm contributors:
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Aaron Grothe
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- Aaron Grothe
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Tiger algorithm contributors:
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Aaron Grothe
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- Aaron Grothe
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VIA PadLock contributors:
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Michal Ludvig
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- Michal Ludvig
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Camellia algorithm contributors:
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NTT(Nippon Telegraph and Telephone Corporation) (Camellia)
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- NTT(Nippon Telegraph and Telephone Corporation) (Camellia)
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Generic scatterwalk code by Adam J. Richter <adam@yggdrasil.com>
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Please send any credits updates or corrections to:
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Herbert Xu <herbert@gondor.apana.org.au>
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@ -17,6 +17,7 @@ for cryptographic use cases, as well as programming examples.
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:maxdepth: 2
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intro
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api-intro
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architecture
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asymmetric-keys
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devel-algos
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