Add fast SSE2 implementations "xmm" for Salsa20 and Salsa20/12

Public Domain implementations by D. J. Bernstein, see
http://cr.yp.to/snuffle.html

1 files changed, 84 insertions, 0 deletions

diff --git a/src/crypto/cipher/salsa20/xmm/salsa20_xmm.c b/src/crypto/cipher/salsa20/xmm/salsa20_xmm.c
new file mode 100644
index 0000000..3787a0e
--- /dev/null
+++ b/src/crypto/cipher/salsa20/xmm/salsa20_xmm.c
@@ -0,0 +1,84 @@
+/*
+  Copyright (c) 2012-2013, 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.
+*/
+
+/*
+  The assembly implementations were written by D. J. Bernstein and are
+  Public Domain. For more information see http://cr.yp.to/snuffle.html
+*/
+
+#include "../../../../crypto.h"
+#include "../../../../cpuid.h"
+
+
+#define KEYBYTES 32
+
+
+#ifdef __x86_64__
+#define crypto_stream_salsa20_xor crypto_stream_salsa20_amd64_xmm6_xor
+#endif
+
+#ifdef __i386__
+#define crypto_stream_salsa20_xor crypto_stream_salsa20_x86_xmm5_xor
+#endif
+
+
+int crypto_stream_salsa20_xor(unsigned char *c, const unsigned char *m, unsigned long long mlen, const unsigned char *n, const unsigned char *k);
+
+
+struct fastd_cipher_state {
+	uint8_t key[KEYBYTES];
+};
+
+
+static bool salsa20_available(void) {
+	return fastd_cpuid() & CPUID_SSE2;
+}
+
+static fastd_cipher_state_t* salsa20_init(const uint8_t *key) {
+	fastd_cipher_state_t *state = malloc(sizeof(fastd_cipher_state_t));
+	memcpy(state->key, key, KEYBYTES);
+
+	return state;
+}
+
+static bool salsa20_crypt(const fastd_cipher_state_t *state, fastd_block128_t *out, const fastd_block128_t *in, size_t len, const uint8_t *iv) {
+	crypto_stream_salsa20_xor(out->b, in->b, len, iv, state->key);
+	return true;
+}
+
+static void salsa20_free(fastd_cipher_state_t *state) {
+	if (state) {
+		secure_memzero(state, sizeof(*state));
+		free(state);
+	}
+}
+
+const fastd_cipher_t fastd_cipher_salsa20_xmm = {
+	.available = salsa20_available,
+
+	.init = salsa20_init,
+	.crypt = salsa20_crypt,
+	.free = salsa20_free,
+};