summaryrefslogtreecommitdiffstats
path: root/src/libcryptobox/chacha20/chacha.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/libcryptobox/chacha20/chacha.c262
1 files changed, 262 insertions, 0 deletions
diff --git a/src/libcryptobox/chacha20/chacha.c b/src/libcryptobox/chacha20/chacha.c
new file mode 100644
index 0000000..0b471c8
--- /dev/null
+++ b/src/libcryptobox/chacha20/chacha.c
@@ -0,0 +1,262 @@
+/* Copyright (c) 2015, Vsevolod Stakhov
+ * Copyright (c) 2015, Andrew Moon
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * 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 ''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 AUTHOR 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 "config.h"
+#include "cryptobox.h"
+#include "chacha.h"
+#include "platform_config.h"
+
+extern unsigned cpu_config;
+
+typedef struct chacha_impl_t {
+ unsigned long cpu_flags;
+ const char *desc;
+ void (*chacha)(const chacha_key *key, const chacha_iv *iv,
+ const unsigned char *in, unsigned char *out, size_t inlen,
+ size_t rounds);
+ void (*xchacha)(const chacha_key *key, const chacha_iv24 *iv,
+ const unsigned char *in, unsigned char *out, size_t inlen,
+ size_t rounds);
+ void (*chacha_blocks)(chacha_state_internal *state,
+ const unsigned char *in, unsigned char *out, size_t bytes);
+ void (*hchacha)(const unsigned char key[32], const unsigned char iv[16],
+ unsigned char out[32], size_t rounds);
+} chacha_impl_t;
+
+#define CHACHA_DECLARE(ext) \
+ void chacha_##ext(const chacha_key *key, const chacha_iv *iv, const unsigned char *in, unsigned char *out, size_t inlen, size_t rounds); \
+ void xchacha_##ext(const chacha_key *key, const chacha_iv24 *iv, const unsigned char *in, unsigned char *out, size_t inlen, size_t rounds); \
+ void chacha_blocks_##ext(chacha_state_internal *state, const unsigned char *in, unsigned char *out, size_t bytes); \
+ void hchacha_##ext(const unsigned char key[32], const unsigned char iv[16], unsigned char out[32], size_t rounds);
+#define CHACHA_IMPL(cpuflags, desc, ext) \
+ { \
+ (cpuflags), desc, chacha_##ext, xchacha_##ext, chacha_blocks_##ext, hchacha_##ext \
+ }
+
+#if defined(HAVE_AVX2) && defined(__x86_64__)
+CHACHA_DECLARE(avx2)
+#define CHACHA_AVX2 CHACHA_IMPL(CPUID_AVX2, "avx2", avx2)
+#endif
+#if defined(HAVE_AVX) && defined(__x86_64__)
+CHACHA_DECLARE(avx)
+#define CHACHA_AVX CHACHA_IMPL(CPUID_AVX, "avx", avx)
+#endif
+#if defined(HAVE_SSE2) && defined(__x86_64__)
+CHACHA_DECLARE(sse2)
+#define CHACHA_SSE2 CHACHA_IMPL(CPUID_SSE2, "sse2", sse2)
+#endif
+
+CHACHA_DECLARE(ref)
+#define CHACHA_GENERIC CHACHA_IMPL(0, "generic", ref)
+
+static const chacha_impl_t chacha_list[] = {
+ CHACHA_GENERIC,
+#if defined(CHACHA_AVX2) && defined(__x86_64__)
+ CHACHA_AVX2,
+#endif
+#if defined(CHACHA_AVX) && defined(__x86_64__)
+ CHACHA_AVX,
+#endif
+#if defined(CHACHA_SSE2) && defined(__x86_64__)
+ CHACHA_SSE2
+#endif
+};
+
+static const chacha_impl_t *chacha_impl = &chacha_list[0];
+
+static int
+chacha_is_aligned(const void *p)
+{
+ return ((size_t) p & (sizeof(size_t) - 1)) == 0;
+}
+
+const char *
+chacha_load(void)
+{
+ guint i;
+
+ if (cpu_config != 0) {
+ for (i = 0; i < G_N_ELEMENTS(chacha_list); i++) {
+ if (chacha_list[i].cpu_flags & cpu_config) {
+ chacha_impl = &chacha_list[i];
+ break;
+ }
+ }
+ }
+
+ return chacha_impl->desc;
+}
+
+void chacha_init(chacha_state *S, const chacha_key *key,
+ const chacha_iv *iv, size_t rounds)
+{
+ chacha_state_internal *state = (chacha_state_internal *) S;
+ memcpy(state->s + 0, key, 32);
+ memset(state->s + 32, 0, 8);
+ memcpy(state->s + 40, iv, 8);
+ state->rounds = rounds;
+ state->leftover = 0;
+}
+
+/* processes inlen bytes (can do partial blocks), handling input/output alignment */
+static void
+chacha_consume(chacha_state_internal *state,
+ const unsigned char *in, unsigned char *out, size_t inlen)
+{
+ unsigned char buffer[16 * CHACHA_BLOCKBYTES];
+ int in_aligned, out_aligned;
+
+ /* it's ok to call with 0 bytes */
+ if (!inlen)
+ return;
+
+ /* if everything is aligned, handle directly */
+ in_aligned = chacha_is_aligned(in);
+ out_aligned = chacha_is_aligned(out);
+ if (in_aligned && out_aligned) {
+ chacha_impl->chacha_blocks(state, in, out, inlen);
+ return;
+ }
+
+ /* copy the unaligned data to an aligned buffer and process in chunks */
+ while (inlen) {
+ const size_t bytes = (inlen > sizeof(buffer)) ? sizeof(buffer) : inlen;
+ const unsigned char *src = in;
+ unsigned char *dst = (out_aligned) ? out : buffer;
+ if (!in_aligned) {
+ memcpy(buffer, in, bytes);
+ src = buffer;
+ }
+ chacha_impl->chacha_blocks(state, src, dst, bytes);
+ if (!out_aligned)
+ memcpy(out, buffer, bytes);
+ if (in)
+ in += bytes;
+ out += bytes;
+ inlen -= bytes;
+ }
+}
+
+/* hchacha */
+void hchacha(const unsigned char key[32],
+ const unsigned char iv[16], unsigned char out[32], size_t rounds)
+{
+ chacha_impl->hchacha(key, iv, out, rounds);
+}
+
+/* update, returns number of bytes written to out */
+size_t
+chacha_update(chacha_state *S, const unsigned char *in, unsigned char *out,
+ size_t inlen)
+{
+ chacha_state_internal *state = (chacha_state_internal *) S;
+ unsigned char *out_start = out;
+ size_t bytes;
+
+ /* enough for at least one block? */
+ while ((state->leftover + inlen) >= CHACHA_BLOCKBYTES) {
+ /* handle the previous data */
+ if (state->leftover) {
+ bytes = (CHACHA_BLOCKBYTES - state->leftover);
+ if (in) {
+ memcpy(state->buffer + state->leftover, in, bytes);
+ in += bytes;
+ }
+ chacha_consume(state, (in) ? state->buffer : NULL, out,
+ CHACHA_BLOCKBYTES);
+ inlen -= bytes;
+ out += CHACHA_BLOCKBYTES;
+ state->leftover = 0;
+ }
+
+ /* handle the direct data */
+ bytes = (inlen & ~(CHACHA_BLOCKBYTES - 1));
+ if (bytes) {
+ chacha_consume(state, in, out, bytes);
+ inlen -= bytes;
+ if (in)
+ in += bytes;
+ out += bytes;
+ }
+ }
+
+ /* handle leftover data */
+ if (inlen) {
+ if (in)
+ memcpy(state->buffer + state->leftover, in, inlen);
+ else
+ memset(state->buffer + state->leftover, 0, inlen);
+ state->leftover += inlen;
+ }
+
+ return out - out_start;
+}
+
+/* finalize, write out any leftover data */
+size_t
+chacha_final(chacha_state *S, unsigned char *out)
+{
+ chacha_state_internal *state = (chacha_state_internal *) S;
+ size_t leftover = state->leftover;
+ if (leftover) {
+ if (chacha_is_aligned(out)) {
+ chacha_impl->chacha_blocks(state, state->buffer, out, leftover);
+ }
+ else {
+ chacha_impl->chacha_blocks(state, state->buffer, state->buffer,
+ leftover);
+ memcpy(out, state->buffer, leftover);
+ }
+ }
+ rspamd_explicit_memzero(S, sizeof(chacha_state));
+ return leftover;
+}
+
+/* one-shot, input/output assumed to be word aligned */
+void chacha(const chacha_key *key, const chacha_iv *iv,
+ const unsigned char *in, unsigned char *out, size_t inlen,
+ size_t rounds)
+{
+ chacha_impl->chacha(key, iv, in, out, inlen, rounds);
+}
+
+/*
+ xchacha, chacha with a 192 bit nonce
+ */
+
+void xchacha_init(chacha_state *S, const chacha_key *key,
+ const chacha_iv24 *iv, size_t rounds)
+{
+ chacha_key subkey;
+ hchacha(key->b, iv->b, subkey.b, rounds);
+ chacha_init(S, &subkey, (chacha_iv *) (iv->b + 16), rounds);
+}
+
+/* one-shot, input/output assumed to be word aligned */
+void xchacha(const chacha_key *key, const chacha_iv24 *iv,
+ const unsigned char *in, unsigned char *out, size_t inlen,
+ size_t rounds)
+{
+ chacha_impl->xchacha(key, iv, in, out, inlen, rounds);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 17:15:44 +0000