Hi, This patch set adds AEAD and RNG support to the AF_ALG interface exported by the kernel crypto API. By extending AF_ALG with AEAD and RNG support, all cipher types the kernel crypto API allows access to are now accessible from userspace. Both, AEAD and RNG implementations are stand-alone and do not depend other AF_ALG interfaces (like hash or skcipher). The AEAD implementation uses the same approach as provided with skcipher by offering the following interfaces: * sendmsg and recvmsg interfaces allowing multiple invocations supporting a threaded user space. To support multi-threaded user space, kernel-side buffering is implemented similarly to skcipher. * splice / vmsplice interfaces allowing a zero-copy invocation The RNG interface only implements the recvmsg interface as zero-copy is not applicable. The new AEAD and RNG interfaces are fully tested with the test application provided at [1]. That test application exercises all newly added user space interfaces. The testing covers: * use of the sendmsg/recvmsg interface * use of the splice / vmsplice interface * invocation of all AF_ALG types (aead, rng, skcipher, hash) * using all types of operation (encryption, decryption, keyed MD, MD, random numbers, AEAD decryption with positive and negative authentication verification) * stress testing by running all tests for 30 minutes in an endless loop * test execution on 64 bit and 32 bit [1] http://www.chronox.de/libkcapi.html Changes v2: * rebase to current cryptodev-2.6 tree * use memzero_explicit to zeroize AEAD associated data * use sizeof for determining length of AEAD associated data * update algif_rng.c covering all suggestions from Daniel Borkmann <dborkman@xxxxxxxxxx> * addition of patch 9: add digestsize interface for hashes * addition of patch to update documentation covering the userspace interface * change numbers of getsockopt options: separate them from sendmsg interface definitions Changes v3: * remove getsockopt interface * AEAD: associated data is set prepended to the plain/ciphertext * AEAD: allowing arbitrary associated data lengths * remove setkey patch as protection was already in the existing code Changes v4: * stand-alone implementation of AEAD * testing of all interfaces offered by AEAD * stress testing of AEAD and RNG Changes v5: * AEAD: add outer while(size) loop in aead_sendmsg to ensure all data is copied into the kernel (reporter Herbert Xu) * AEAD: aead_sendmsg bug fix: change size -= len; to size -= plen; * AF_ALG / AEAD: add aead_setauthsize and associated extension to struct af_alg_type as well as alg_setsockopt (reporter Herbert Xu) * RNG: rng_recvmsg: use 128 byte stack variable for output of RNG instead of ctx->result (reporter Herbert Xu) * RNG / AF_ALG: allow user space to seed RNG via setsockopt * RNG: rng_recvmsg bug fix: use genlen as result variable for crypto_rng_get_bytes as previously no negative errors were obtained * AF_ALG: alg_setop: zeroize buffer before free Stephan Mueller (8): crypto: AF_ALG: add user space interface for AEAD crypto: AF_ALG: add setsockopt for auth tag size crypto: AF_ALG: add AEAD support crypto: AF_ALG: enable AEAD interface compilation crypto: AF_ALG: add user space interface for RNG crypto: AF_ALG: zeroize key / seed data crypto: AF_ALG: add random number generator support crypto: AF_ALG: enable RNG interface compilation crypto/Kconfig | 18 ++ crypto/Makefile | 2 + crypto/af_alg.c | 42 ++- crypto/algif_aead.c | 650 ++++++++++++++++++++++++++++++++++++++++++++ crypto/algif_rng.c | 192 +++++++++++++ include/crypto/if_alg.h | 3 + include/uapi/linux/if_alg.h | 3 + 7 files changed, 900 insertions(+), 10 deletions(-) create mode 100644 crypto/algif_aead.c create mode 100644 crypto/algif_rng.c -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
