diff options
Diffstat (limited to 'src/linux_alg.c')
| -rw-r--r-- | src/linux_alg.c | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/src/linux_alg.c b/src/linux_alg.c deleted file mode 100644 index ab08cab..0000000 --- a/src/linux_alg.c +++ /dev/null @@ -1,196 +0,0 @@ -/* - Copyright (c) 2012, Matthias Schiffer <mschiffer@universe-factory.net> - All rights reserved. - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions are met: - - 1. Redistributions of source code must retain the above copyright notice, - this list of conditions and the following disclaimer. - 2. Redistributions in binary form must reproduce the above copyright notice, - this list of conditions and the following disclaimer in the documentation - and/or other materials provided with the distribution. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE - DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE - FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR - SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER - CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, - OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -*/ - - -#include "linux_alg.h" - -#include <alloca.h> -#include <linux/if_alg.h> -#include <unistd.h> - - -#ifndef SOL_ALG -#define SOL_ALG 279 -#endif - - -static int init_aesctr(fastd_context *ctx) { - int fd = socket(AF_ALG, SOCK_SEQPACKET, 0); - if (fd < 0) - goto error; - - struct sockaddr_alg sa = {}; - sa.salg_family = AF_ALG; - strcpy((char*)sa.salg_type, "skcipher"); - strcpy((char*)sa.salg_name, "ctr(aes)"); - if (bind(fd, (struct sockaddr*)&sa, sizeof(sa)) < 0) - goto error; - - return fd; - - error: - if (fd >= 0) - close(fd); - - pr_info(ctx, "no kernel support for AES-CTR was found, falling back to userspace implementation"); - return -1; -} - -static int init_ghash(fastd_context *ctx) { - int fd = socket(AF_ALG, SOCK_SEQPACKET, 0); - if (fd < 0) - goto error; - - struct sockaddr_alg sa = {}; - sa.salg_family = AF_ALG; - strcpy((char*)sa.salg_type, "hash"); - strcpy((char*)sa.salg_name, "ghash"); - if (bind(fd, (struct sockaddr*)&sa, sizeof(sa)) < 0) - goto error; - - return fd; - - error: - if (fd >= 0) - close(fd); - - pr_info(ctx, "no kernel support for GHASH was found, falling back to userspace implementation"); - return -1; -} - -void fastd_linux_alg_init(fastd_context *ctx) { - if (ctx->conf->alg_impl_aes128ctr == ALG_IMPL_ALGIF) - ctx->algfd_aesctr = init_aesctr(ctx); - else - ctx->algfd_aesctr = -1; - - if (ctx->conf->alg_impl_ghash == ALG_IMPL_ALGIF) - ctx->algfd_ghash = init_ghash(ctx); - else - ctx->algfd_ghash = -1; -} - -void fastd_linux_alg_close(fastd_context *ctx) { - if (ctx->algfd_ghash >= 0) - close(ctx->algfd_ghash); - - if (ctx->algfd_aesctr >= 0) - close(ctx->algfd_aesctr); -} - -int fastd_linux_alg_aesctr_init(fastd_context *ctx, uint8_t *key, size_t keylen) { - if (ctx->algfd_aesctr < 0) - return -1; - - if (setsockopt(ctx->algfd_aesctr, SOL_ALG, ALG_SET_KEY, key, keylen) < 0) { - pr_error_errno(ctx, "fastd_linux_alg_aesctr_init: setsockopt"); - return -1; - } - - int ret = accept(ctx->algfd_aesctr, NULL, NULL); - - if (ret < 0) { - pr_error_errno(ctx, "fastd_linux_alg_aesctr_init: accept"); - return -1; - } - - return ret; -} - -bool fastd_linux_alg_aesctr(fastd_context *ctx, int fd, void *out, const void *in, size_t len, const uint8_t iv[16]) { - if (!len) - return false; - - struct iovec vec = { .iov_base = (void*)in, .iov_len = len }; - - static const size_t cmsglen = sizeof(struct cmsghdr)+sizeof(struct af_alg_iv)+16; - struct cmsghdr *cmsg = alloca(cmsglen); - cmsg->cmsg_len = cmsglen; - cmsg->cmsg_level = SOL_ALG; - cmsg->cmsg_type = ALG_SET_IV; - - struct af_alg_iv *alg_iv = (void*)CMSG_DATA(cmsg); - alg_iv->ivlen = 16; - memcpy(alg_iv->iv, iv, 16); - - struct msghdr msg = { - .msg_iov = &vec, - .msg_iovlen = 1, - .msg_control = cmsg, - .msg_controllen = cmsglen - }; - - if (sendmsg(fd, &msg, 0) < 0) { - pr_error_errno(ctx, "fastd_linux_alg_aesctr: sendmsg"); - return false; - } - - msg.msg_control = NULL; - msg.msg_controllen = 0; - vec.iov_base = out; - - if (recvmsg(fd, &msg, 0) < 0) { - pr_error_errno(ctx, "fastd_linux_alg_aesctr: recvmsg"); - return false; - } - - return true; -} - -int fastd_linux_alg_ghash_init(fastd_context *ctx, uint8_t key[16]) { - if (ctx->algfd_ghash < 0) - return -1; - - if (setsockopt(ctx->algfd_ghash, SOL_ALG, ALG_SET_KEY, key, 16) < 0) { - pr_error_errno(ctx, "fastd_linux_alg_ghash_init: setsockopt"); - return -1; - } - - int ret = accept(ctx->algfd_ghash, NULL, NULL); - - if (ret < 0) { - pr_error_errno(ctx, "fastd_linux_alg_ghash_init: accept"); - return -1; - } - - return ret; -} - -bool fastd_linux_alg_ghash(fastd_context *ctx, int fd, uint8_t out[16], const void *data, size_t len) { - if (!len) - return false; - - if (write(fd, data, len) < 0) { - pr_error_errno(ctx, "fastd_linux_alg_ghash: write"); - return false; - } - - if (read(fd, out, 16) < 16) { - pr_error_errno(ctx, "fastd_linux_alg_ghash: read"); - return false; - } - - return true; -} |