Unused, untested, provisional RAND interface for DRBG.

fips/rand/Makefile

@@ -23,9 +23,11 @@ APPS=
 
 LIB=$(TOP)/libcrypto.a
 LIBSRC=	fips_rand.c fips_rand_selftest.c \
-	fips_drbg_lib.c fips_drbg_hash.c fips_drbg_ctr.c fips_drbg_selftest.c
+	fips_drbg_lib.c fips_drbg_hash.c fips_drbg_ctr.c fips_drbg_selftest.c \
+	fips_drbg_rand.c
 LIBOBJ=	fips_rand.o fips_rand_selftest.o \
-	fips_drbg_lib.o fips_drbg_hash.o fips_drbg_ctr.o fips_drbg_selftest.o
+	fips_drbg_lib.o fips_drbg_hash.o fips_drbg_ctr.o fips_drbg_selftest.o \
+	fips_drbg_rand.o
 
 SRC= $(LIBSRC)
 

fips/rand/fips_drbg_rand.c

+/* fips/rand/fips_drbg_rand.c */
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project.
+ */
+/* ====================================================================
+ * Copyright (c) 2011 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ */
+
+#define OPENSSL_FIPSAPI
+
+#include <string.h>
+#include <openssl/crypto.h>
+#include <openssl/evp.h>
+#include <openssl/aes.h>
+#include <openssl/err.h>
+#include <openssl/rand.h>
+#include <openssl/fips_rand.h>
+#include "fips_rand_lcl.h"
+
+/* Mapping of SP800-90 DRBGs to OpenSSL RAND_METHOD */
+
+/* Since we only have one global PRNG used at any time in OpenSSL use a global
+ * variable to store contexts.
+ */
+
+static DRBG_CTX ossl_dctx;
+
+DRBG_CTX *FIPS_get_default_drbg(void)
+	{
+	return &ossl_dctx;
+	}
+
+static int fips_drbg_bytes(unsigned char *out, int count)
+	{
+	DRBG_CTX *dctx = &ossl_dctx;
+	int rv = 0;
+	unsigned char *adin = NULL;
+	size_t adinlen = 0;
+	CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+	do 
+		{
+		size_t rcnt;
+		if (count > (int)dctx->max_request)
+			rcnt = dctx->max_request;
+		else
+			rcnt = count;
+		if (dctx->get_adin)
+			{
+			adinlen = dctx->get_adin(dctx, &adin);
+			if (adinlen && !adin)
+				{
+				/* ERROR */
+				goto err;
+				}
+			}
+		rv = FIPS_drbg_generate(dctx, out, rcnt, 0, 0, adin, adinlen);
+		if (adin)
+			{
+			if (dctx->cleanup_adin)
+				dctx->cleanup_adin(dctx, adin, adinlen);
+			adin = NULL;
+			}
+		if (!rv)
+			goto err;
+		out += rcnt;
+		count -= rcnt;
+		}
+	while (count);
+	rv = 1;
+	err:
+	CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+	return rv;
+	}
+
+static int fips_drbg_status(void)
+	{
+	DRBG_CTX *dctx = &ossl_dctx;
+	int rv;
+	CRYPTO_r_lock(CRYPTO_LOCK_RAND);
+	rv = dctx->status == DRBG_STATUS_READY ? 1 : 0;
+	CRYPTO_r_unlock(CRYPTO_LOCK_RAND);
+	return rv;
+	}
+
+static void fips_drbg_cleanup(void)
+	{
+	DRBG_CTX *dctx = &ossl_dctx;
+	CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+	FIPS_drbg_uninstantiate(dctx);
+	CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+	}
+
+static int fips_drbg_seed(const void *seed, int seedlen)
+	{
+	DRBG_CTX *dctx = &ossl_dctx;
+	int rv = 1;
+	if (dctx->rand_seed_cb)
+		{
+		CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+		rv = dctx->rand_seed_cb(dctx, seed, seedlen);
+		CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+		}
+	return rv;
+	}
+
+static int fips_drbg_add(const void *seed, int seedlen,
+					double add_entropy)
+	{
+	DRBG_CTX *dctx = &ossl_dctx;
+	int rv = 1;
+	if (dctx->rand_add_cb)
+		{
+		CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+		rv = dctx->rand_add_cb(dctx, seed, seedlen, add_entropy);
+		CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+		}
+	return rv;
+	}
+
+static const RAND_METHOD rand_drbg_meth =
+	{
+	fips_drbg_seed,
+	fips_drbg_bytes,
+	fips_drbg_cleanup,
+	fips_drbg_add,
+	fips_drbg_bytes,
+	fips_drbg_status
+	};
+
+const RAND_METHOD *FIPS_drbg_method(void)
+	{
+	return &rand_drbg_meth;
+	}
+

fips/rand/fips_rand.h

@@ -102,6 +102,10 @@ void FIPS_drbg_set_app_data(DRBG_CTX *ctx, void *app_data);
 size_t FIPS_drbg_get_blocklength(DRBG_CTX *dctx);
 int FIPS_drbg_get_strength(DRBG_CTX *dctx);
 
+DRBG_CTX *FIPS_get_default_drbg(void);
+const RAND_METHOD *FIPS_drbg_method(void);
+
+
 #ifdef  __cplusplus
 }
 #endif

fips/rand/fips_rand_lcl.h

@@ -167,6 +167,14 @@ struct drbg_ctx_st
 	/* set if lb is valid */
 	int lb_valid;
 
+	/* Callbacks used when called through RAND interface */
+	/* Get any additional input for generate */
+	size_t (*get_adin)(DRBG_CTX *ctx, unsigned char **pout);
+	void (*cleanup_adin)(DRBG_CTX *ctx, unsigned char *out, size_t olen);
+	/* Callback for RAND_seed(), RAND_add() */
+	int (*rand_seed_cb)(DRBG_CTX *ctx, const void *buf, int num);
+	int (*rand_add_cb)(DRBG_CTX *ctx,
+				const void *buf, int num, double entropy);
 	};