1 files changed, 104 insertions, 0 deletions
diff --git a/third_party/bearssl/src/aes_ct64_cbcdec.c b/third_party/bearssl/src/aes_ct64_cbcdec.c
new file mode 100644
index 0000000..5a7360b
--- /dev/null
+++ b/third_party/bearssl/src/aes_ct64_cbcdec.c
@@ -0,0 +1,104 @@
+/*
+ * 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"
+
+/* see bearssl_block.h */
+void
+br_aes_ct64_cbcdec_init(br_aes_ct64_cbcdec_keys *ctx,
+	const void *key, size_t len)
+{
+	ctx->vtable = &br_aes_ct64_cbcdec_vtable;
+	ctx->num_rounds = br_aes_ct64_keysched(ctx->skey, key, len);
+}
+
+/* see bearssl_block.h */
+void
+br_aes_ct64_cbcdec_run(const br_aes_ct64_cbcdec_keys *ctx,
+	void *iv, void *data, size_t len)
+{
+	unsigned char *buf;
+	uint64_t sk_exp[120];
+	uint32_t ivw[4];
+
+	br_aes_ct64_skey_expand(sk_exp, ctx->num_rounds, ctx->skey);
+	br_range_dec32le(ivw, 4, iv);
+	buf = data;
+	while (len > 0) {
+		uint64_t q[8];
+		uint32_t w1[16], w2[16];
+		int i;
+
+		if (len >= 64) {
+			br_range_dec32le(w1, 16, buf);
+		} else {
+			br_range_dec32le(w1, len >> 2, buf);
+		}
+		for (i = 0; i < 4; i ++) {
+			br_aes_ct64_interleave_in(
+				&q[i], &q[i + 4], w1 + (i << 2));
+		}
+		br_aes_ct64_ortho(q);
+		br_aes_ct64_bitslice_decrypt(ctx->num_rounds, sk_exp, q);
+		br_aes_ct64_ortho(q);
+		for (i = 0; i < 4; i ++) {
+			br_aes_ct64_interleave_out(
+				w2 + (i << 2), q[i], q[i + 4]);
+		}
+		for (i = 0; i < 4; i ++) {
+			w2[i] ^= ivw[i];
+		}
+		if (len >= 64) {
+			for (i = 4; i < 16; i ++) {
+				w2[i] ^= w1[i - 4];
+			}
+			memcpy(ivw, w1 + 12, sizeof ivw);
+			br_range_enc32le(buf, w2, 16);
+		} else {
+			int j;
+
+			j = (int)(len >> 2);
+			for (i = 4; i < j; i ++) {
+				w2[i] ^= w1[i - 4];
+			}
+			memcpy(ivw, w1 + j - 4, sizeof ivw);
+			br_range_enc32le(buf, w2, j);
+			break;
+		}
+		buf += 64;
+		len -= 64;
+	}
+	br_range_enc32le(iv, ivw, 4);
+}
+
+/* see bearssl_block.h */
+const br_block_cbcdec_class br_aes_ct64_cbcdec_vtable = {
+	sizeof(br_aes_ct64_cbcdec_keys),
+	16,
+	4,
+	(void (*)(const br_block_cbcdec_class **, const void *, size_t))
+		&br_aes_ct64_cbcdec_init,
+	(void (*)(const br_block_cbcdec_class *const *, void *, void *, size_t))
+		&br_aes_ct64_cbcdec_run
+};