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-rw-r--r--src/main.c204
-rw-r--r--src/sse_accel.S45
2 files changed, 249 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..1b023fc
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,204 @@
+/*
+ * Copyright (c) 2023 Ian Marco Moffett and the VegaOS team.
+ * 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.
+ * 3. Neither the name of VegaOS nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * 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 OWNER 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 <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <assert.h>
+#include <unistd.h>
+#include <info.h>
+#if defined(__x86_64__)
+#include <sse_accel.h>
+#endif /* defined(__x86_64__) */
+
+#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
+#error "Big endian machines not supported yet"
+#endif
+
+#define cpuid(level, a, b, c, d) \
+ __asm__ __volatile__ ("cpuid\n\t" \
+ : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \
+ : "0" (level))
+
+#define flip_block(TMP_VAR, TYPE, BUF, POS) \
+ TMP_VAR = *(TYPE *)&BUF[POS]; \
+ TMP_VAR = ~TMP_VAR; \
+ *(TYPE *)&BUF[POS] = TMP_VAR; \
+
+static char *
+read_file(const char *fname, size_t *size_out)
+{
+ FILE *fp;
+ char *buf;
+ size_t bufsize;
+
+ if (access(fname, F_OK) != 0) {
+ fprintf(stderr, "%s does not exist!\n");
+ return NULL;
+ }
+
+ fp = fopen(fname, "r");
+
+ /* Get file size */
+ fseek(fp, 0, SEEK_END);
+ bufsize = ftell(fp);
+ fseek(fp, 0, SEEK_SET);
+
+ buf = malloc(bufsize);
+ fread(buf, sizeof(char), bufsize, fp);
+ fclose(fp);
+
+ *size_out = bufsize;
+
+ return buf;
+}
+
+static void
+writeback_file(const char *fname, const char *buf, size_t buf_size)
+{
+ FILE *fp;
+
+ fp = fopen(fname, "w");
+ fwrite(buf, buf_size, sizeof(char), fp);
+ fclose(fp);
+}
+
+#if defined(__x86_64__)
+static inline bool
+is_sse3_supported(void)
+{
+ uint32_t ecx, unused;
+
+ cpuid(0x0000001, unused, unused, ecx, unused);
+ return (ecx & (1 << 0)) != 0;
+}
+
+static inline bool
+is_sse2_supported(void)
+{
+ uint32_t edx, unused;
+ cpuid(0x0000001, unused, unused, unused, edx);
+ return (edx & (1 << 26)) != 0;
+}
+
+static void
+amd64_cpu_tests(struct cpu_info *info)
+{
+ bool sse3_supported;
+
+ sse3_supported = false;
+
+ if (is_sse3_supported()) {
+ printf("[?]: SSE3 supported, may use as optimization\n");
+ sse3_supported = true;
+ info->has_sse3 = 1;
+ }
+
+ if (!sse3_supported) {
+ if (is_sse2_supported()) {
+ printf("[?]: SSE2 supported, may use as optimization\n");
+ info->has_sse2 = 1;
+ }
+ }
+}
+#endif /* defined(__x86_64__) */
+
+static char *
+encrypt(const struct cpu_info *info, char *buf, size_t buf_size)
+{
+ size_t current_pos;
+ size_t step;
+ uint64_t tmp;
+
+ current_pos = 0;
+ step = 8; /* Start at 8 bytes (64 bits) */
+
+#if defined(__x86_64__)
+ if (info->has_sse2 || info->has_sse3) {
+ step += 8; /* Start at 128 bits */
+ }
+#endif /* defined(__x86_64__) */
+
+ while (current_pos < buf_size) {
+ /* Ensure we aren't over 16 bytes and a power of two */
+ if (step != 1) {
+ assert((step & 1) == 0 && step <= 16);
+ }
+
+ switch (step) {
+ case 16:
+ accel_invert128((uintptr_t)buf + current_pos);
+ break;
+ case 8:
+ flip_block(tmp, uint64_t, buf, current_pos);
+ break;
+ case 4:
+ flip_block(tmp, uint32_t, buf, current_pos);
+ break;
+ case 2:
+ flip_block(tmp, uint16_t, buf, current_pos);
+ break;
+ case 1:
+ flip_block(tmp, uint8_t, buf, current_pos);
+ break;
+ }
+
+ current_pos += step;
+
+ /* Ensure we don't cause any overflows */
+ while (((current_pos + step) >= buf_size) && step > 1)
+ /* Essentially divide the step by 2, just faster */
+ step >>= 1;
+ }
+}
+
+int
+main(int argc, const char **argv)
+{
+ size_t buf_size;
+ char *buf;
+ struct cpu_info info = { 0 };
+
+ if (argc < 2) {
+ fprintf(stderr, "Usage: %s <file>\n", argv[0]);
+ return 1;
+ }
+
+#if defined(__x86_64__)
+ amd64_cpu_tests(&info);
+#endif /* __x86_64__ */
+
+ buf = read_file(argv[1], &buf_size);
+ encrypt(&info, buf, buf_size);
+ writeback_file(argv[1], buf, buf_size);
+ free(buf);
+
+ return 0;
+}
diff --git a/src/sse_accel.S b/src/sse_accel.S
new file mode 100644
index 0000000..928caaf
--- /dev/null
+++ b/src/sse_accel.S
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2023 Ian Marco Moffett and the VegaOS team.
+ * 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.
+ * 3. Neither the name of VegaOS nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * 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 OWNER 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.
+ */
+
+ .section .text
+ .globl accel_invert128
+
+ /*
+ * accel_invert128(uint64_t addr)
+ */
+ accel_invert128:
+ movq %rdi, %rax
+ movdqu (%rax), %xmm0
+
+ /* Set %xmm1 to all 1s and emulate NOT for %xmm0 */
+ pcmpeqb %xmm1, %xmm1
+ pxor %xmm0, %xmm1
+
+ movdqu %xmm0, (%rax)
+ retq
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 12:56:13 +0000