X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/rand/tlsprf.h

diff --git a/rand/tlsprf.h b/rand/tlsprf.h
new file mode 100644
index 0000000..f655e71
--- /dev/null
+++ b/rand/tlsprf.h
@@ -0,0 +1,203 @@
+/* -*-c-*-
+ *
+ * The TLS pseudo-random function
+ *
+ * (c) 2001 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#ifndef CATACOMB_TLSPRF_H
+#define CATACOMB_TLSPRF_H
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#ifndef CATACOMB_GMAC_H
+#  include "gmac.h"
+#endif
+
+#ifndef CATACOMB_GRAND_H
+#  include "grand.h"
+#endif
+
+/*----- Data structures ---------------------------------------------------*/
+
+typedef struct tlsdx_ctx {
+  gmac *k;				/* The MAC key to use */
+  size_t hashsz;			/* Size of hash outputs */
+  ghash *i, *o;				/* Inner and outer hash contexts */
+  const octet *sd;			/* Pointer to seed buffer */
+  size_t sdsz;				/* Size of the seed buffer */
+  octet *p;				/* Pointer to buffered output */
+  size_t sz;				/* Bytes remaining in buffer */
+  octet *ai;				/* Pointer to inner result */
+} tlsdx_ctx;
+
+typedef struct tlsprf_ctx {
+  tlsdx_ctx px, py;
+} tlsprf_ctx;
+
+/*----- The data expansion function ---------------------------------------*/
+
+/* --- @tlsdx_init@ --- *
+ *
+ * Arguments:	@tlsdx_ctx *c@ = pointer to a context
+ *		@gmac *m@ = pointer to a generic MAC instance
+ *		@const void *sd@ = pointer to the seed block
+ *		@size_t sdsz@ = size of the seed block
+ *
+ * Returns:	---
+ *
+ * Use:		Initializes a context for the TLS data expansion function.
+ *		This doesn't take ownership of the MAC instance or the seed
+ *		memory, nor does it allocate copies.
+ */
+
+extern void tlsdx_init(tlsdx_ctx */*c*/, gmac */*m*/,
+		       const void */*sd*/, size_t /*sdsz*/);
+
+/* --- @tlsdx_encrypt@ --- *
+ *
+ * Arguments:	@tlsdx_ctx *c@ = pointer to a context
+ *		@const void *src@ = pointer to source data
+ *		@void *dest@ = pointer to destination buffer
+ *		@size_t sz@ = size of buffer
+ *
+ * Returns:	---
+ *
+ * Use:		Encrypts data using the TLS data expansion function.  If the
+ *		destination pointer is null, the generator is spun and no
+ *		output is produced; if the source pointer is null, raw output
+ *		from the generator is written; otherwise, the source data is
+ *		XORed with the generator output.
+ */
+
+extern void tlsdx_encrypt(tlsdx_ctx */*c*/, const void */*src*/,
+			  void */*dest*/, size_t /*sz*/);
+
+/* --- @tlsdx_free@ --- *
+ *
+ * Arguments:	@tlsdx_ctx *c@ = pointer to the context block
+ *
+ * Returns:	---
+ *
+ * Use:		Frees a context for the TLS data expansion function
+ */
+
+extern void tlsdx_free(tlsdx_ctx */*c*/);
+
+/* ---@tlsdx_rand@ --- *
+ *
+ * Arguments:	@const gcmac *mc@ = MAC function to use
+ *		@const void *k@ = pointer to the key material
+ *		@size_t ksz@ = size of the key material
+ *		@const void *sd@ = pointer to the seed material
+ *		@size_t sdsz@ = size of the seed material
+ *
+ * Returns:	Pointer to generic random number generator interface.
+ *
+ * Use:		Creates a generic generator which does TLS data expansion.
+ */
+
+extern grand *tlsdx_rand(const gcmac */*mc*/,
+			 const void */*k*/, size_t /*ksz*/,
+			 const void */*sd*/, size_t /*sdsz*/);
+
+/* --- The actual very paranoid PRF ---------------------------------------*/
+
+/* --- @tlsprf_init@ --- *
+ *
+ * Arguments:	@tlsprf_ctx *c@ = pointer to context block
+ *		@const gcmac *mcx, *mcy@ = left and right MAC functions
+ *		@const void *k@ = pointer to the key material
+ *		@size_t ksz@ = size of the key material
+ *		@const void *sd@ = pointer to the seed material
+ *		@size_t sdsz@ = size of the seed material
+ *
+ * Returns:	---
+ *
+ * Use:		Initializes a TLS PRF context.
+ */
+
+extern void tlsprf_init(tlsprf_ctx */*c*/,
+			const gcmac */*mcx*/, const gcmac */*mcy*/,
+			const void */*k*/, size_t /*ksz*/,
+			const void */*sd*/, size_t /*sdsz*/);
+
+/* --- @tlsprf_encrypt@ --- *
+ *
+ * Arguments:	@tlsprf_ctx *c@ = pointer to a context
+ *		@const void *src@ = pointer to source data
+ *		@void *dest@ = pointer to destination buffer
+ *		@size_t sz@ = size of buffer
+ *
+ * Returns:	---
+ *
+ * Use:		Encrypts data using the TLS pseudo-random function.  If the
+ *		destination pointer is null, the generator is spun and no
+ *		output is produced; if the source pointer is null, raw output
+ *		from the generator is written; otherwise, the source data is
+ *		XORed with the generator output.
+ */
+
+extern void tlsprf_encrypt(tlsprf_ctx */*c*/,
+			   const void */*src*/, void */*dest*/,
+			   size_t /*sz*/);
+
+/* --- @tlsprf_free@ --- *
+ *
+ * Arguments:	@tlsprf_ctx *c@ = pointer to a context
+ *
+ * Returns:	---
+ *
+ * Use:		Frees a TLS PRF context.
+ */
+
+extern void tlsprf_free(tlsprf_ctx */*c*/);
+
+/* ---@tlsprf_rand@ --- *
+ *
+ * Arguments:	@const gcmac *mcx, *mcy@ = MAC function to use
+ *		@const void *k@ = pointer to the key material
+ *		@size_t ksz@ = size of the key material
+ *		@const void *sd@ = pointer to the seed material
+ *		@size_t sdsz@ = size of the seed material
+ *
+ * Returns:	Pointer to generic random number generator interface.
+ *
+ * Use:		Creates a generic generator which does TLS data expansion.
+ */
+
+extern grand *tlsprf_rand(const gcmac */*mcx*/, const gcmac */*mcy*/,
+			  const void */*k*/, size_t /*ksz*/,
+			  const void */*sd*/, size_t /*sdsz*/);
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif