initial commit

1 files changed, 129 insertions, 0 deletions

diff --git a/third_party/bearssl/src/aes_small_enc.c b/third_party/bearssl/src/aes_small_enc.c
new file mode 100644
index 0000000..29f48a8
--- /dev/null
+++ b/third_party/bearssl/src/aes_small_enc.c
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+/*
+ * Copyright (c) 2016 Thomas Pornin <[email protected]>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining 
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "inner.h"
+
+#define S   br_aes_S
+
+static void
+add_round_key(unsigned *state, const uint32_t *skeys)
+{
+	int i;
+
+	for (i = 0; i < 16; i += 4) {
+		uint32_t k;
+
+		k = *skeys ++;
+		state[i + 0] ^= (unsigned)(k >> 24);
+		state[i + 1] ^= (unsigned)(k >> 16) & 0xFF;
+		state[i + 2] ^= (unsigned)(k >> 8) & 0xFF;
+		state[i + 3] ^= (unsigned)k & 0xFF;
+	}
+}
+
+static void
+sub_bytes(unsigned *state)
+{
+	int i;
+
+	for (i = 0; i < 16; i ++) {
+		state[i] = S[state[i]];
+	}
+}
+
+static void
+shift_rows(unsigned *state)
+{
+	unsigned tmp;
+
+	tmp = state[1];
+	state[1] = state[5];
+	state[5] = state[9];
+	state[9] = state[13];
+	state[13] = tmp;
+
+	tmp = state[2];
+	state[2] = state[10];
+	state[10] = tmp;
+	tmp = state[6];
+	state[6] = state[14];
+	state[14] = tmp;
+
+	tmp = state[15];
+	state[15] = state[11];
+	state[11] = state[7];
+	state[7] = state[3];
+	state[3] = tmp;
+}
+
+static void
+mix_columns(unsigned *state)
+{
+	int i;
+
+	for (i = 0; i < 16; i += 4) {
+		unsigned s0, s1, s2, s3;
+		unsigned t0, t1, t2, t3;
+
+		s0 = state[i + 0];
+		s1 = state[i + 1];
+		s2 = state[i + 2];
+		s3 = state[i + 3];
+		t0 = (s0 << 1) ^ s1 ^ (s1 << 1) ^ s2 ^ s3;
+		t1 = s0 ^ (s1 << 1) ^ s2 ^ (s2 << 1) ^ s3;
+		t2 = s0 ^ s1 ^ (s2 << 1) ^ s3 ^ (s3 << 1);
+		t3 = s0 ^ (s0 << 1) ^ s1 ^ s2 ^ (s3 << 1);
+		state[i + 0] = t0 ^ ((unsigned)(-(int)(t0 >> 8)) & 0x11B);
+		state[i + 1] = t1 ^ ((unsigned)(-(int)(t1 >> 8)) & 0x11B);
+		state[i + 2] = t2 ^ ((unsigned)(-(int)(t2 >> 8)) & 0x11B);
+		state[i + 3] = t3 ^ ((unsigned)(-(int)(t3 >> 8)) & 0x11B);
+	}
+}
+
+/* see inner.h */
+void
+br_aes_small_encrypt(unsigned num_rounds, const uint32_t *skey, void *data)
+{
+	unsigned char *buf;
+	unsigned state[16];
+	unsigned u;
+
+	buf = data;
+	for (u = 0; u < 16; u ++) {
+		state[u] = buf[u];
+	}
+	add_round_key(state, skey);
+	for (u = 1; u < num_rounds; u ++) {
+		sub_bytes(state);
+		shift_rows(state);
+		mix_columns(state);
+		add_round_key(state, skey + (u << 2));
+	}
+	sub_bytes(state);
+	shift_rows(state);
+	add_round_key(state, skey + (num_rounds << 2));
+	for (u = 0; u < 16; u ++) {
+		buf[u] = state[u];
+	}
+}