Initial import.

inc/bearssl_prf.h

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
+ *
+ * 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.
+ */
+
+#ifndef BR_BEARSSL_PRF_H__
+#define BR_BEARSSL_PRF_H__
+
+#include <stddef.h>
+#include <stdint.h>
+
+/*
+ * The TLS PRF
+ * -----------
+ *
+ * TLS 1.0 and 1.1 define a PRF that is based on both MD5 and SHA-1. This
+ * is implemented by the br_tls10_prf() function.
+ *
+ * TLS 1.2 redefines the PRF, using an explicit hash function. The
+ * br_tls12_sha256_prf() and br_tls12_sha384_prf() functions apply that
+ * PRF with, respectively, SHA-256 and SHA-384.
+ *
+ * The PRF always uses as input three parameters: a "secret" (some
+ * bytes), a "label" (ASCII string), and a "seed" (again some bytes).
+ * An arbitrary output length can be produced.
+ */
+
+void br_tls10_prf(void *dst, size_t len,
+	const void *secret, size_t secret_len,
+	const char *label, const void *seed, size_t seed_len);
+
+void br_tls12_sha256_prf(void *dst, size_t len,
+	const void *secret, size_t secret_len,
+	const char *label, const void *seed, size_t seed_len);
+
+void br_tls12_sha384_prf(void *dst, size_t len,
+	const void *secret, size_t secret_len,
+	const char *label, const void *seed, size_t seed_len);
+
+/*
+ * A convenient type name for a PRF implementation.
+ */
+typedef void (*br_tls_prf_impl)(void *dst, size_t len,
+	const void *secret, size_t secret_len,
+	const char *label, const void *seed, size_t seed_len);
+
+#endif