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

diff --git a/rand/sslprf.h b/rand/sslprf.h
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+/* -*-c-*-
+ *
+ * The SSL 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_SSLPRF_H
+#define CATACOMB_SSLPRF_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 sslprf_ctx {
+  const gchash *co, *ci;		/* Outer and inner hash functions */
+  size_t ohashsz, ihashsz;		/* Size of the hash outputs */
+  ghash *h;				/* Hash context from last time */
+  const octet *k;			/* Pointer to the secret */
+  size_t ksz;				/* Size of the secret buffer */
+  const octet *sd;			/* Pointer to the seed */
+  size_t sdsz;				/* Size of the seed buffer */
+  unsigned i;				/* Which iteration this is */
+  octet *p;				/* Pointer to output buffer */
+  size_t sz;				/* How many bytes are left */
+} sslprf_ctx;
+
+/*----- Functions provided ------------------------------------------------*/
+
+/* --- @sslprf_init@ --- *
+ *
+ * Arguments:	@sslprf_ctx *c@ = pointer to a context structure
+ *		@const gchash *hco, *hci@ = outer and inner hash functions
+ *		@const void *k@ = pointer to secret buffer
+ *		@size_t ksz@ = size of the secret
+ *		@const void *sd@ = pointer to seed buffer
+ *		@size_t sdsz@ = size of the seed
+ *
+ * Returns:	---
+ *
+ * Use:		Initializes an SSL generator context.
+ */
+
+extern void sslprf_init(sslprf_ctx */*c*/,
+			const gchash */*hco*/, const gchash */*hci*/,
+			const void */*k*/, size_t /*ksz*/,
+			const void */*sd*/, size_t /*sdsz*/);
+
+/* --- @sslprf_encrypt@ --- *
+ *
+ * Arguments:	@sslprf_ctx *c@ = pointer to a context structure
+ *		@const void *src@ = pointer to source buffer
+ *		@void *dest@ = pointer to destination buffer
+ *		@size_t sz@ = size of the buffers
+ *
+ * Returns:	---
+ *
+ * Use:		Encrypts data using the SSL 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 sslprf_encrypt(sslprf_ctx */*c*/,
+			   const void */*src*/, void */*dest*/,
+			   size_t /*sz*/);
+
+/* --- @sslprf_free@ --- *
+ *
+ * Arguments:	@sslprf_ctx@ = pointer to a context
+ *
+ * Returns:	---
+ *
+ * Use:		Frees resources held in an SSL generator context.
+ */
+
+extern void sslprf_free(sslprf_ctx */*c*/);
+
+/* ---@sslprf_rand@ --- *
+ *
+ * Arguments:	@const gchash *hco, const gchash *hci@ = hash 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:	Pointer to generic random number generator interface.
+ *
+ * Use:		Creates a generic generator which does TLS data expansion.
+ */
+
+extern grand *sslprf_rand(const gchash */*hco*/, const gchash */*hci*/,
+			  const void */*k*/, size_t /*ksz*/,
+			  const void */*sd*/, size_t /*sdsz*/);
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif