summaryrefslogtreecommitdiff
path: root/crypto/salsa20_generic.c
AgeCommit message (Collapse)Author
2020-07-23crypto: Replace HTTP links with HTTPS onesAlexander A. Klimov
Rationale: Reduces attack surface on kernel devs opening the links for MITM as HTTPS traffic is much harder to manipulate. Deterministic algorithm: For each file: If not .svg: For each line: If doesn't contain `\bxmlns\b`: For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`: If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`: If both the HTTP and HTTPS versions return 200 OK and serve the same content: Replace HTTP with HTTPS. Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-04-18crypto: run initcalls for generic implementations earlierEric Biggers
Use subsys_initcall for registration of all templates and generic algorithm implementations, rather than module_init. Then change cryptomgr to use arch_initcall, to place it before the subsys_initcalls. This is needed so that when both a generic and optimized implementation of an algorithm are built into the kernel (not loadable modules), the generic implementation is registered before the optimized one. Otherwise, the self-tests for the optimized implementation are unable to allocate the generic implementation for the new comparison fuzz tests. Note that on arm, a side effect of this change is that self-tests for generic implementations may run before the unaligned access handler has been installed. So, unaligned accesses will crash the kernel. This is arguably a good thing as it makes it easier to detect that type of bug. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-04-18crypto: salsa20 - don't access already-freed walk.ivEric Biggers
If the user-provided IV needs to be aligned to the algorithm's alignmask, then skcipher_walk_virt() copies the IV into a new aligned buffer walk.iv. But skcipher_walk_virt() can fail afterwards, and then if the caller unconditionally accesses walk.iv, it's a use-after-free. salsa20-generic doesn't set an alignmask, so currently it isn't affected by this despite unconditionally accessing walk.iv. However this is more subtle than desired, and it was actually broken prior to the alignmask being removed by commit b62b3db76f73 ("crypto: salsa20-generic - cleanup and convert to skcipher API"). Since salsa20-generic does not update the IV and does not need any IV alignment, update it to use req->iv instead of walk.iv. Fixes: 2407d60872dd ("[CRYPTO] salsa20: Salsa20 stream cipher") Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-03-22crypto: salsa20-generic - use crypto_xor_cpy()Eric Biggers
In salsa20_docrypt(), use crypto_xor_cpy() instead of crypto_xor(). This avoids having to memcpy() the src buffer to the dst buffer. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-12-23crypto: salsa20-generic - don't unnecessarily use atomic walkEric Biggers
salsa20-generic doesn't use SIMD instructions or otherwise disable preemption, so passing atomic=true to skcipher_walk_virt() is unnecessary. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-05-31crypto: salsa20 - Revert "crypto: salsa20 - export generic helpers"Eric Biggers
This reverts commit eb772f37ae8163a89e28a435f6a18742ae06653b, as now the x86 Salsa20 implementation has been removed and the generic helpers are no longer needed outside of salsa20_generic.c. We could keep this just in case someone else wants to add a new optimized Salsa20 implementation. But given that we have ChaCha20 now too, I think it's unlikely. And this can always be reverted back. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-01-12crypto: salsa20 - export generic helpersEric Biggers
Export the Salsa20 constants, transform context, and initialization functions so that they can be reused by the x86 implementation. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-01-12crypto: salsa20-generic - cleanup and convert to skcipher APIEric Biggers
Convert salsa20-generic from the deprecated "blkcipher" API to the "skcipher" API, in the process fixing it up to be thread-safe (as the crypto API expects) by maintaining each request's state separately from the transform context. Also remove the unnecessary cra_alignmask and tighten validation of the key size by accepting only 16 or 32 bytes, not anything in between. These changes bring the code close to the way chacha20-generic does things, so hopefully it will be easier to maintain in the future. However, the way Salsa20 interprets the IV is still slightly different; that was not changed. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2017-11-29crypto: salsa20 - fix blkcipher_walk API usageEric Biggers
When asked to encrypt or decrypt 0 bytes, both the generic and x86 implementations of Salsa20 crash in blkcipher_walk_done(), either when doing 'kfree(walk->buffer)' or 'free_page((unsigned long)walk->page)', because walk->buffer and walk->page have not been initialized. The bug is that Salsa20 is calling blkcipher_walk_done() even when nothing is in 'walk.nbytes'. But blkcipher_walk_done() is only meant to be called when a nonzero number of bytes have been provided. The broken code is part of an optimization that tries to make only one call to salsa20_encrypt_bytes() to process inputs that are not evenly divisible by 64 bytes. To fix the bug, just remove this "optimization" and use the blkcipher_walk API the same way all the other users do. Reproducer: #include <linux/if_alg.h> #include <sys/socket.h> #include <unistd.h> int main() { int algfd, reqfd; struct sockaddr_alg addr = { .salg_type = "skcipher", .salg_name = "salsa20", }; char key[16] = { 0 }; algfd = socket(AF_ALG, SOCK_SEQPACKET, 0); bind(algfd, (void *)&addr, sizeof(addr)); reqfd = accept(algfd, 0, 0); setsockopt(algfd, SOL_ALG, ALG_SET_KEY, key, sizeof(key)); read(reqfd, key, sizeof(key)); } Reported-by: syzbot <syzkaller@googlegroups.com> Fixes: eb6f13eb9f81 ("[CRYPTO] salsa20_generic: Fix multi-page processing") Cc: <stable@vger.kernel.org> # v2.6.25+ Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-01-13crypto: add missing crypto module aliasesMathias Krause
Commit 5d26a105b5a7 ("crypto: prefix module autoloading with "crypto-"") changed the automatic module loading when requesting crypto algorithms to prefix all module requests with "crypto-". This requires all crypto modules to have a crypto specific module alias even if their file name would otherwise match the requested crypto algorithm. Even though commit 5d26a105b5a7 added those aliases for a vast amount of modules, it was missing a few. Add the required MODULE_ALIAS_CRYPTO annotations to those files to make them get loaded automatically, again. This fixes, e.g., requesting 'ecb(blowfish-generic)', which used to work with kernels v3.18 and below. Also change MODULE_ALIAS() lines to MODULE_ALIAS_CRYPTO(). The former won't work for crypto modules any more. Fixes: 5d26a105b5a7 ("crypto: prefix module autoloading with "crypto-"") Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2014-11-24crypto: prefix module autoloading with "crypto-"Kees Cook
This prefixes all crypto module loading with "crypto-" so we never run the risk of exposing module auto-loading to userspace via a crypto API, as demonstrated by Mathias Krause: https://lkml.org/lkml/2013/3/4/70 Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2012-08-01crypto: cleanup - remove unneeded crypto_alg.cra_list initializationsJussi Kivilinna
Initialization of cra_list is currently mixed, most ciphers initialize this field and most shashes do not. Initialization however is not needed at all since cra_list is initialized/overwritten in __crypto_register_alg() with list_add(). Therefore perform cleanup to remove all unneeded initializations of this field in 'crypto/'. Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2008-12-25crypto: salsa20 - Remove private wrappers around various operationsHarvey Harrison
ROTATE -> rol32 XOR was always used with the same destination, use ^= PLUS/PLUSONE use ++ or += Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2008-04-21[CRYPTO] all: Clean up init()/fini()Kamalesh Babulal
On Thu, Mar 27, 2008 at 03:40:36PM +0100, Bodo Eggert wrote: > Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> wrote: > > > This patch cleanups the crypto code, replaces the init() and fini() > > with the <algorithm name>_init/_fini > > This part ist OK. > > > or init/fini_<algorithm name> (if the > > <algorithm name>_init/_fini exist) > > Having init_foo and foo_init won't be a good thing, will it? I'd start > confusing them. > > What about foo_modinit instead? Thanks for the suggestion, the init() is replaced with <algorithm name>_mod_init () and fini () is replaced with <algorithm name>_mod_fini. Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2008-01-11[CRYPTO] salsa20_generic: Fix multi-page processingTan Swee Heng
This patch fixes the multi-page processing bug that affects large test vectors (the same bug that previously affected ctr.c). There is an optimization for the case walk.nbytes == nbytes. Also we now use crypto_xor() instead of adhoc XOR routines. Signed-off-by: Tan Swee Heng <thesweeheng@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2008-01-11[CRYPTO] salsa20: Salsa20 stream cipherTan Swee Heng
This patch implements the Salsa20 stream cipher using the blkcipher interface. The core cipher code comes from Daniel Bernstein's submission to eSTREAM: http://www.ecrypt.eu.org/stream/svn/viewcvs.cgi/ecrypt/trunk/submissions/salsa20/full/ref/ The test vectors comes from: http://www.ecrypt.eu.org/stream/svn/viewcvs.cgi/ecrypt/trunk/submissions/salsa20/full/ It has been tested successfully with "modprobe tcrypt mode=34" on an UML instance. Signed-off-by: Tan Swee Heng <thesweeheng@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>