Nicely encapsulate different crypto algorithm implementations

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;
-}