1 files changed, 73 insertions, 0 deletions
diff --git a/third_party/bearssl/src/prf.c b/third_party/bearssl/src/prf.c
new file mode 100644
index 0000000..f04a5fb
--- /dev/null
+++ b/third_party/bearssl/src/prf.c
@@ -0,0 +1,73 @@
+/*
+ * 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 inner.h */
+void
+br_tls_phash(void *dst, size_t len,
+	const br_hash_class *dig,
+	const void *secret, size_t secret_len, const char *label,
+	size_t seed_num, const br_tls_prf_seed_chunk *seed)
+{
+	unsigned char *buf;
+	unsigned char tmp[64], a[64];
+	br_hmac_key_context kc;
+	br_hmac_context hc;
+	size_t label_len, hlen, u;
+
+	if (len == 0) {
+		return;
+	}
+	buf = dst;
+	for (label_len = 0; label[label_len]; label_len ++);
+	hlen = br_digest_size(dig);
+	br_hmac_key_init(&kc, dig, secret, secret_len);
+	br_hmac_init(&hc, &kc, 0);
+	br_hmac_update(&hc, label, label_len);
+	for (u = 0; u < seed_num; u ++) {
+		br_hmac_update(&hc, seed[u].data, seed[u].len);
+	}
+	br_hmac_out(&hc, a);
+	for (;;) {
+		br_hmac_init(&hc, &kc, 0);
+		br_hmac_update(&hc, a, hlen);
+		br_hmac_update(&hc, label, label_len);
+		for (u = 0; u < seed_num; u ++) {
+			br_hmac_update(&hc, seed[u].data, seed[u].len);
+		}
+		br_hmac_out(&hc, tmp);
+		for (u = 0; u < hlen && u < len; u ++) {
+			buf[u] ^= tmp[u];
+		}
+		buf += u;
+		len -= u;
+		if (len == 0) {
+			return;
+		}
+		br_hmac_init(&hc, &kc, 0);
+		br_hmac_update(&hc, a, hlen);
+		br_hmac_out(&hc, a);
+	}
+}