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2007-10-10[CRYPTO] xts: XTS blockcipher mode implementation without partial blocksRik Snel
XTS currently considered to be the successor of the LRW mode by the IEEE1619 workgroup. LRW was discarded, because it was not secure if the encyption key itself is encrypted with LRW. XTS does not have this problem. The implementation is pretty straightforward, a new function was added to gf128mul to handle GF(128) elements in ble format. Four testvectors from the specification http://grouper.ieee.org/groups/1619/email/pdf00086.pdf were added, and they verify on my system. Signed-off-by: Rik Snel <rsnel@cube.dyndns.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-10-10[CRYPTO] aead: Add authencHerbert Xu
This patch adds the authenc algorithm which constructs an AEAD algorithm from an asynchronous block cipher and a hash. The construction is done by concatenating the encrypted result from the cipher with the output from the hash, as is used by the IPsec ESP protocol. The authenc algorithm exists as a template with four parameters: authenc(auth, authsize, enc, enckeylen). The authentication algorithm, the authentication size (i.e., truncating the output of the authentication algorithm), the encryption algorithm, and the encryption key length. Both the size field and the key length field are in bytes. For example, AES-128 with SHA1-HMAC would be represented by authenc(hmac(sha1), 12, cbc(aes), 16) The key for the authenc algorithm is the concatenation of the keys for the authentication algorithm with the encryption algorithm. For the above example, if a key of length 36 bytes is given, then hmac(sha1) would receive the first 20 bytes while the last 16 would be given to cbc(aes). Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-10-10[CRYPTO] ablkcipher: Remove queue pointer from common alg objectHerbert Xu
Since not everyone needs a queue pointer and those who need it can always get it from the context anyway the queue pointer in the common alg object is redundant. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-10-10[CRYPTO] api: Add aead crypto typeHerbert Xu
This patch adds crypto_aead which is the interface for AEAD (Authenticated Encryption with Associated Data) algorithms. AEAD algorithms perform authentication and encryption in one step. Traditionally users (such as IPsec) would use two different crypto algorithms to perform these. With AEAD this comes down to one algorithm and one operation. Of course if traditional algorithms were used we'd still be doing two operations underneath. However, real AEAD algorithms may allow the underlying operations to be optimised as well. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-10-10[CRYPTO] api: Add crypto_ablkcipher_ctx_alignedSebastian Siewior
This is function does the same thing for ablkcipher that is done for blkcipher by crypto_blkcipher_ctx_aligned(): it returns an aligned address of the private ctx. Signed-off-by: Sebastian Siewior <sebastian@breakpoint.cc> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-05-02[CRYPTO] cryptd: Add software async crypto daemonHerbert Xu
This patch adds the cryptd module which is a template that takes a synchronous software crypto algorithm and converts it to an asynchronous one by executing it in a kernel thread. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-05-02[CRYPTO] api: Do not remove users unless new algorithm matchesHerbert Xu
As it is whenever a new algorithm with the same name is registered users of the old algorithm will be removed so that they can take advantage of the new algorithm. This presents a problem when the new algorithm is not equivalent to the old algorithm. In particular, the new algorithm might only function on top of the existing one. Hence we should not remove users unless they can make use of the new algorithm. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-05-02[CRYPTO] api: Add async blkcipher typeHerbert Xu
This patch adds the mid-level interface for asynchronous block ciphers. It also includes a generic queueing mechanism that can be used by other asynchronous crypto operations in future. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-05-02[CRYPTO] templates: Pass type/mask when creating instancesHerbert Xu
This patch passes the type/mask along when constructing instances of templates. This is in preparation for templates that may support multiple types of instances depending on what is requested. For example, the planned software async crypto driver will use this construct. For the moment this allows us to check whether the instance constructed is of the correct type and avoid returning success if the type does not match. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-02-07[CRYPTO] api: Allow multiple frontends per backendHerbert Xu
This patch adds support for multiple frontend types for each backend algorithm by passing the type and mask through to the backend type init function. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2007-02-07[CRYPTO] api: Add type-safe spawnsHerbert Xu
This patch allows spawns of specific types (e.g., cipher) to be allocated. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-12-06[CRYPTO] lib: table driven multiplications in GF(2^128)Rik Snel
A lot of cypher modes need multiplications in GF(2^128). LRW, ABL, GCM... I use functions from this library in my LRW implementation and I will also use them in my ABL (Arbitrary Block Length, an unencumbered (correct me if I am wrong, wide block cipher mode). Elements of GF(2^128) must be presented as u128 *, it encourages automatic and proper alignment. The library contains support for two different representations of GF(2^128), see the comment in gf128mul.h. There different levels of optimization (memory/speed tradeoff). The code is based on work by Dr Brian Gladman. Notable changes: - deletion of two optimization modes - change from u32 to u64 for faster handling on 64bit machines - support for 'bbe' representation in addition to the, already implemented, 'lle' representation. - move 'inline void' functions from header to 'static void' in the source file - update to use the linux coding style conventions The original can be found at: http://fp.gladman.plus.com/AES/modes.vc8.19-06-06.zip The copyright (and GPL statement) of the original author is preserved. Signed-off-by: Rik Snel <rsnel@cube.dyndns.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-12-06[CRYPTO] lib: some common 128-bit block operations, nicely centralizedRik Snel
128bit is a common blocksize in linux kernel cryptography, so it helps to centralize some common operations. The code, while mostly trivial, is based on a header file mode_hdr.h in http://fp.gladman.plus.com/AES/modes.vc8.19-06-06.zip The original copyright (and GPL statement) of the original author, Dr Brian Gladman, is preserved. Signed-off-by: Rik Snel <rsnel@cube.dyndns.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-09-21[CRYPTO] digest: Added user API for new hash typeHerbert Xu
The existing digest user interface is inadequate for support asynchronous operations. For one it doesn't return a value to indicate success or failure, nor does it take a per-operation descriptor which is essential for the issuing of requests while other requests are still outstanding. This patch is the first in a series of steps to remodel the interface for asynchronous operations. For the ease of transition the new interface will be known as "hash" while the old one will remain as "digest". This patch also changes sg_next to allow chaining. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-09-21[CRYPTO] cipher: Added block ciphers for CBC/ECBHerbert Xu
This patch adds two block cipher algorithms, CBC and ECB. These are implemented as templates on top of existing single-block cipher algorithms. They invoke the single-block cipher through the new encrypt_one/decrypt_one interface. This also optimises the in-place encryption and decryption to remove the cost of an IV copy each round. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-09-21[CRYPTO] cipher: Added block cipher typeHerbert Xu
This patch adds the new type of block ciphers. Unlike current cipher algorithms which operate on a single block at a time, block ciphers operate on an arbitrarily long linear area of data. As it is block-based, it will skip any data remaining at the end which cannot form a block. The block cipher has one major difference when compared to the existing block cipher implementation. The sg walking is now performed by the algorithm rather than the cipher mid-layer. This is needed for drivers that directly support sg lists. It also improves performance for all algorithms as it reduces the total number of indirect calls by one. In future the existing cipher algorithm will be converted to only have a single-block interface. This will be done after all existing users have switched over to the new block cipher type. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-09-21[CRYPTO] scatterwalk: Prepare for block ciphersHerbert Xu
This patch prepares the scatterwalk code for use by the new block cipher type. Firstly it halves the size of scatter_walk on 32-bit platforms. This is important as we allocate at least two of these objects on the stack for each block cipher operation. It also exports the symbols since the block cipher code can be built as a module. Finally there is a hack in scatterwalk_unmap that relies on progress being made. Unfortunately, for hardware crypto we can't guarantee progress to be made since the hardware can fail. So this also gets rid of the hack by not advancing the address returned by scatterwalk_map. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-09-21[CRYPTO] cipher: Added encrypt_one/decrypt_oneHerbert Xu
This patch adds two new operations for the simple cipher that encrypts or decrypts a single block at a time. This will be the main interface after the existing block operations have moved over to the new block ciphers. It also adds the crypto_cipher type which is currently only used on the new operations but will be extended to setkey as well once existing users have been converted to use block ciphers where applicable. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-09-21[CRYPTO] api: Added crypto_type supportHerbert Xu
This patch adds the crypto_type structure which will be used for all new crypto algorithm types, beginning with block ciphers. The primary purpose of this abstraction is to allow different crypto_type objects for crypto algorithms of the same type, in particular, there will be a different crypto_type objects for asynchronous algorithms. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-09-21[CRYPTO] api: Add common instance initialisation codeHerbert Xu
This patch adds the helpers crypto_get_attr_alg and crypto_alloc_instance which can be used by simple one-argument templates like hmac to process input parameters and allocate instances. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-09-21[CRYPTO] api: Get rid of flags argument to setkeyHerbert Xu
Now that the tfm is passed directly to setkey instead of the ctx, we no longer need to pass the &tfm->crt_flags pointer. This patch also gets rid of a few unnecessary checks on the key length for ciphers as the cipher layer guarantees that the key length is within the bounds specified by the algorithm. Rather than testing dia_setkey every time, this patch does it only once during crypto_alloc_tfm. The redundant check from crypto_digest_setkey is also removed. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-09-21[CRYPTO] api: Added spawnsHerbert Xu
Spawns lock a specific crypto algorithm in place. They can then be used with crypto_spawn_tfm to allocate a tfm for that algorithm. When the base algorithm of a spawn is deregistered, all its spawns will be automatically removed. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2006-09-21[CRYPTO] api: Add template registrationHerbert Xu
A crypto_template generates a crypto_alg object when given a set of parameters. this patch adds the basic data structure fo templates and code to handle their registration/deregistration. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
2006-09-21[CRYPTO] api: Split out low-level APIHerbert Xu
The crypto API is made up of the part facing users such as IPsec and the low-level part which is used by cryptographic entities such as algorithms. This patch splits out the latter so that the two APIs are more clearly delineated. As a bonus the low-level API can now be modularised if all algorithms are built as modules. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2006-09-21[CRYPTO] twofish: Split out common c codeJoachim Fritschi
This patch splits up the twofish crypto routine into a common part ( key setup ) which will be uses by all twofish crypto modules ( generic-c , i586 assembler and x86_64 assembler ) and generic-c part. It also creates a new header file which will be used by all 3 modules. This eliminates all code duplication. Correctness was verified with the tcrypt module and automated test scripts. Signed-off-by: Joachim Fritschi <jfritschi@freenet.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>