Commit 591cbfae authored by Dr. Stephen Henson's avatar Dr. Stephen Henson
Browse files

Initial, provisional, subject to wholesale change, untested, probably 

not working, incomplete and unused SP800-90 DRBGs for CTR and Hash modes.

Did I say this was untested?
parent a000759a

CHANGES

+4 −0
Original line number Diff line number Diff line
@@ -4,6 +4,10 @@ 


 Changes between 1.0.1 and 1.1.0  [xx XXX xxxx]



  *) Initial implementation of SP800-90 DRBGs for Hash and CTR. Not used by

     anything, incomplete, subject to change and largely untested at present.

     [Steve Henson]



  *) Modify fipscanisteronly build option to only build the necessary object

     files by filtering FIPS_EX_OBJ through a perl script in crypto/Makefile.

     [Steve Henson]

fips/rand/Makefile

+5 −3
Original line number Diff line number Diff line
@@ -22,13 +22,15 @@ TEST= fips_randtest.c fips_rngvs.c 
APPS=



LIB=$(TOP)/libcrypto.a

LIBSRC=fips_rand.c fips_rand_selftest.c

LIBOBJ=fips_rand.o fips_rand_selftest.o

LIBSRC=	fips_rand.c fips_rand_selftest.c \

	fips_drbg_lib.c fips_drbg_hash.c fips_drbg_ctr.c

LIBOBJ=	fips_rand.o fips_rand_selftest.o \

	fips_drbg_lib.o fips_drbg_hash.o fips_drbg_ctr.o



SRC= $(LIBSRC)



EXHEADER= fips_rand.h

HEADER=	$(EXHEADER)

HEADER=	$(EXHEADER) fips_rand_lcl.h



ALL=    $(GENERAL) $(SRC) $(HEADER)

fips/rand/fips_drbg_ctr.c

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+419 −0
Original line number Diff line number Diff line 
/* fips/rand/fips_drbg_ctr.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.

 * ====================================================================

 */



#include <stdlib.h>

#include <string.h>

#include <openssl/crypto.h>

#include <openssl/evp.h>

#include <openssl/aes.h>

#include <openssl/fips.h>

#include <openssl/fips_rand.h>

#include "fips_rand_lcl.h"



static void inc_128(DRBG_CTR_CTX *cctx)

	{

	int i;

	unsigned char c;

	unsigned char *p = cctx->V + 15;

	for (i = 0; i < 16; i++)

		{

		c = *p;

		c++;

		*p = c;

		if (c)

			return;

		p--;

		}

	}



static void ctr_XOR(DRBG_CTR_CTX *cctx, const unsigned char *in, size_t inlen)

	{

	size_t i, n;

	/* Any zero padding will have no effect on the result as we

	 * are XORing. So just process however much input we have.

	 */



	if (!in || !inlen)

		return;



	if (inlen < cctx->keylen)

		n = inlen;

	else

		n = cctx->keylen;



	for (i = 0; i < n; i++)

		cctx->K[i] ^= in[i];

	if (inlen <= cctx->keylen)

		return;



	n = inlen - cctx->keylen;

	/* Should never happen */

	if (n > 16)

		n = 16;

	for (i = 0; i < 16; i++)

		cctx->V[i] ^= in[i + cctx->keylen];

	}



/* Process a complete block using BCC algorithm of SPP 800-90 10.4.3 */



static void ctr_BCC_block(DRBG_CTR_CTX *cctx, unsigned char *out,

				const unsigned char *in)

	{

	int i;

	for (i = 0; i < 16; i++)

		out[i] ^= in[i];

	AES_encrypt(out, out, &cctx->df_ks);

#if 0

fprintf(stderr, "BCC in+out\n");

BIO_dump_fp(stderr, in, 16);

BIO_dump_fp(stderr, out, 16);

#endif

	}



/* Handle several BCC operations for as much data as we need for K and X */

static void ctr_BCC_blocks(DRBG_CTR_CTX *cctx, const unsigned char *in)

	{

	ctr_BCC_block(cctx, cctx->KX, in);

	ctr_BCC_block(cctx, cctx->KX + 16, in);

	if (cctx->keylen != 16)

		ctr_BCC_block(cctx, cctx->KX + 32, in);

	}

/* Initialise BCC blocks: these have the value 0,1,2 in leftmost positions:

 * see 10.4.2 stage 7.

 */

static void ctr_BCC_init(DRBG_CTR_CTX *cctx)

	{

	memset(cctx->KX, 0, 48);

	memset(cctx->bltmp, 0, 16);

	ctr_BCC_block(cctx, cctx->KX, cctx->bltmp);

	cctx->bltmp[3] = 1;

	ctr_BCC_block(cctx, cctx->KX + 16, cctx->bltmp);

	if (cctx->keylen != 16)

		{

		cctx->bltmp[3] = 2;

		ctr_BCC_block(cctx, cctx->KX + 32, cctx->bltmp);

		}

	}



/* Process several blocks into BCC algorithm, some possibly partial */

static void ctr_BCC_update(DRBG_CTR_CTX *cctx,

				const unsigned char *in, size_t inlen)

	{

	if (!in || !inlen)

		return;

	/* If we have partial block handle it first */

	if (cctx->bltmp_pos)

		{

		size_t left = 16 - cctx->bltmp_pos;

		/* If we now have a complete block process it */

		if (inlen >= left)

			{

			memcpy(cctx->bltmp + cctx->bltmp_pos, in, left);

			ctr_BCC_blocks(cctx, cctx->bltmp);

			cctx->bltmp_pos = 0;

			inlen -= left;

			in += left;

			}

		}

	/* Process zero or more complete blocks */

	while (inlen >= 16)

		{

		ctr_BCC_blocks(cctx, in);

		in += 16;

		inlen -= 16;

		}

	/* Copy any remaining partial block to the temporary buffer */

	if (inlen > 0)

		{

		memcpy(cctx->bltmp + cctx->bltmp_pos, in, inlen);

		cctx->bltmp_pos += inlen;

		}

	}



static void ctr_BCC_final(DRBG_CTR_CTX *cctx)

	{

	if (cctx->bltmp_pos)

		{

		memset(cctx->bltmp + cctx->bltmp_pos, 0, 16 - cctx->bltmp_pos);

		ctr_BCC_blocks(cctx, cctx->bltmp);

		}

	}



static void ctr_df(DRBG_CTR_CTX *cctx,

			const unsigned char *in1, size_t in1len,

			const unsigned char *in2, size_t in2len,

			const unsigned char *in3, size_t in3len)

	{

	size_t inlen;

	unsigned char *p = cctx->bltmp;

	static unsigned char c80 = 0x80;



	ctr_BCC_init(cctx);

	if (!in1)

		in1len = 0;

	if (!in2)

		in2len = 0;

	if (!in3)

		in3len = 0;

	inlen = in1len + in2len + in3len;

	/* Initialise L||N in temporary block */

	*p++ = (inlen >> 24) & 0xff;

	*p++ = (inlen >> 16) & 0xff;

	*p++ = (inlen >> 8) & 0xff;

	*p++ = inlen & 0xff;

	/* NB keylen is at most 32 bytes */

	*p++ = 0;

	*p++ = 0;

	*p++ = 0;

	*p = (unsigned char)((cctx->keylen + 16) & 0xff);

	cctx->bltmp_pos = 8;

	ctr_BCC_update(cctx, in1, in1len);

	ctr_BCC_update(cctx, in2, in2len);

	ctr_BCC_update(cctx, in3, in3len);

	ctr_BCC_update(cctx, &c80, 1);

	ctr_BCC_final(cctx);

	/* Set up key K */

	AES_set_encrypt_key(cctx->KX, cctx->keylen * 8, &cctx->df_kxks);

	/* X follows key K */

	AES_encrypt(cctx->KX + cctx->keylen, cctx->KX, &cctx->df_kxks);

	AES_encrypt(cctx->KX, cctx->KX + 16, &cctx->df_kxks);

	if (cctx->keylen != 16)

		AES_encrypt(cctx->KX + 16, cctx->KX + 32, &cctx->df_kxks);

#if 0

fprintf(stderr, "Output of ctr_df:\n");

BIO_dump_fp(stderr, cctx->KX, cctx->keylen + 16);

#endif

	}



/* NB the no-df  Update in SP800-90 specifies a constant input length

 * of seedlen, however other uses of this algorithm pad the input with

 * zeroes if necessary and have up to two parameters XORed together,

 * handle both cases in this function instead.

 */



static void ctr_Update(DRBG_CTX *dctx,

		const unsigned char *in1, size_t in1len,

		const unsigned char *in2, size_t in2len,

		const unsigned char *nonce, size_t noncelen)

	{

	DRBG_CTR_CTX *cctx = &dctx->d.ctr;

	/* ks is already setup for correct key */

	inc_128(cctx);

	AES_encrypt(cctx->V, cctx->K, &cctx->ks);

	/* If keylen longer than 128 bits need extra encrypt */

	if (cctx->keylen != 16)

		{

		inc_128(cctx);

		AES_encrypt(cctx->V, cctx->K + 16, &cctx->ks);

		}

	inc_128(cctx);

	AES_encrypt(cctx->V, cctx->V, &cctx->ks);

	/* If 192 bit key part of V is on end of K */

	if (cctx->keylen == 24)

		{

		memcpy(cctx->V + 8, cctx->V, 8);

		memcpy(cctx->V, cctx->K + 24, 8);

		}



	if (dctx->flags & DRBG_FLAG_CTR_USE_DF)

		{

		/* If no input reuse existing derived value */

		if (in1 || nonce || in2)

			ctr_df(cctx, in1, in1len, nonce, noncelen, in2, in2len);

		/* If this a reuse input in1len != 0 */

		if (in1len)

			ctr_XOR(cctx, cctx->KX, dctx->seedlen);

		}

	else

		{

		ctr_XOR(cctx, in1, in1len);

		ctr_XOR(cctx, in2, in2len);

		}



	AES_set_encrypt_key(cctx->K, dctx->strength, &cctx->ks);

#if 0

fprintf(stderr, "K+V after update is:\n");

BIO_dump_fp(stderr, cctx->K, cctx->keylen);

BIO_dump_fp(stderr, cctx->V, 16);

#endif

	}



static int drbg_ctr_instantiate(DRBG_CTX *dctx,

			const unsigned char *ent, size_t entlen,

			const unsigned char *nonce, size_t noncelen,

			const unsigned char *pers, size_t perslen)

	{

	DRBG_CTR_CTX *cctx = &dctx->d.ctr;

	memset(cctx->K, 0, sizeof(cctx->K));

	memset(cctx->V, 0, sizeof(cctx->V));

	AES_set_encrypt_key(cctx->K, dctx->strength, &cctx->ks);

	ctr_Update(dctx, ent, entlen, pers, perslen, nonce, noncelen);

	return 1;

	}



static int drbg_ctr_reseed(DRBG_CTX *dctx, 

			const unsigned char *ent, size_t entlen,

			const unsigned char *adin, size_t adinlen)

	{

	ctr_Update(dctx, ent, entlen, adin, adinlen, NULL, 0);

	return 1;

	}



static int drbg_ctr_generate(DRBG_CTX *dctx,

			unsigned char *out, size_t outlen,

			const unsigned char *adin, size_t adinlen)

	{

	DRBG_CTR_CTX *cctx = &dctx->d.ctr;

	if (adin && adinlen)

		{

		ctr_Update(dctx, adin, adinlen, NULL, 0, NULL, 0);

		/* This means we reuse derived value */

		if (dctx->flags & DRBG_FLAG_CTR_USE_DF)

			{

			adin = NULL;

			adinlen = 1;

			}

		}

	else

		adinlen = 0;



	for (;;)

		{

		inc_128(cctx);

		if (outlen < 16)

			{

			/* Use K as temp space as it will be updated */

			AES_encrypt(cctx->V, cctx->K, &cctx->ks);

			memcpy(out, cctx->K, outlen);

			break;

			}

		AES_encrypt(cctx->V, out, &cctx->ks);

		out += 16;

		outlen -= 16;

		if (outlen == 0)

			break;

		}



	ctr_Update(dctx, adin, adinlen, NULL, 0, NULL, 0);



	return 1;



	}



int fips_drbg_ctr_init(DRBG_CTX *dctx)

	{

	DRBG_CTR_CTX *cctx = &dctx->d.ctr;



	size_t keylen;



	switch (dctx->type)

		{

		case NID_aes_128_ctr:

		keylen = 16;



		case NID_aes_192_ctr:

		keylen = 24;



		case NID_aes_256_ctr:

		keylen = 32;



		default:

		return -2;

		}



	dctx->instantiate = drbg_ctr_instantiate;

	dctx->reseed = drbg_ctr_reseed;

	dctx->generate = drbg_ctr_generate;





	cctx->keylen = keylen;

	dctx->strength = keylen * 8;

	dctx->blocklength = 16;

	dctx->seedlen = keylen + 16;



	if (dctx->flags & DRBG_FLAG_CTR_USE_DF)

		{

		/* df initialisation */

		static unsigned char df_key[32] =

			{

			0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,

			0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,

			0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,

			0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f 

			};

		/* Set key schedule for df_key */

		AES_set_encrypt_key(df_key, dctx->strength, &cctx->df_ks);



		dctx->min_entropy = dctx->seedlen;

		dctx->max_entropy = dctx->seedlen;

		/* Nonce not used */

		dctx->min_nonce = 0;

		dctx->max_nonce = 0;

		dctx->max_pers = dctx->seedlen;

		dctx->max_adin = dctx->seedlen;

		}

	else

		{

		dctx->min_entropy = cctx->keylen;

		dctx->max_entropy = DRBG_MAX_ENTROPY;

		dctx->min_nonce = dctx->min_entropy / 2;

		dctx->max_nonce = DRBG_MAX_NONCE;

		dctx->max_pers = DRBG_MAX_LENGTH;

		dctx->max_adin = DRBG_MAX_LENGTH;

		}



	dctx->max_request = 1<<19;

	dctx->reseed_counter = DRBG_MAX_LENGTH;



	return 1;

	}

fips/rand/fips_drbg_hash.c

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Original line number Diff line number Diff line 
/* fips/rand/fips_drbg_hash.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 <stdlib.h>

#include <string.h>

#include <openssl/crypto.h>

#include <openssl/evp.h>

#include <openssl/aes.h>

#include <openssl/fips.h>

#include <openssl/fips_rand.h>

#include "fips_rand_lcl.h"



/* This is Hash_df from SP 800-90 10.4.1 */



static int hash_df(DRBG_CTX *dctx, unsigned char *out,

			const unsigned char *in1, size_t in1len,

			const unsigned char *in2, size_t in2len,

			const unsigned char *in3, size_t in3len,

			const unsigned char *in4, size_t in4len)

	{

	EVP_MD_CTX *mctx = &dctx->d.hash.mctx;

	unsigned char *vtmp = dctx->d.hash.vtmp;

	unsigned char tmp[6];

	/* Standard only ever needs seedlen bytes which is always less than

	 * maximum permitted so no need to check length.

	 */

	size_t outlen = dctx->seedlen;

	tmp[0] = 1;

	tmp[1] = ((outlen * 8) >> 24) & 0xff;

	tmp[2] = ((outlen * 8) >> 16) & 0xff;

	tmp[3] = ((outlen * 8) >> 8) & 0xff;

	tmp[4] = (outlen * 8) & 0xff;

	if (!in1)

		{

		tmp[5] = (unsigned char)in1len;

		in1 = tmp + 5;

		in1len = 1;

		}

	for (;;)

		{

		if (!FIPS_digestinit(mctx, dctx->d.hash.md))

			return 0;

		if (!FIPS_digestupdate(mctx, tmp, 5))

			return 0;

		if (in1 && !FIPS_digestupdate(mctx, in1, in1len))

			return 0;

		if (in2 && !FIPS_digestupdate(mctx, in2, in2len))

			return 0;

		if (in3 && !FIPS_digestupdate(mctx, in3, in3len))

			return 0;

		if (in4 && !FIPS_digestupdate(mctx, in4, in4len))

			return 0;

		if (outlen < dctx->blocklength)

			{

			if (!FIPS_digestfinal(mctx, vtmp, NULL))

				return 0;

			memcpy(out, vtmp, outlen);

			OPENSSL_cleanse(vtmp, dctx->blocklength);

			return 1;

			}

		else if(!FIPS_digestfinal(mctx, out, NULL))

			return 0;



		outlen -= dctx->blocklength;

		if (outlen == 0)

			return 1;

		tmp[0]++;

		out += dctx->blocklength;

		}

	}





/* Add an unsigned buffer to the buf value, storing the result in buf. For

 * this algorithm the length of input never exceeds the seed length.

 */



static void ctx_add_buf(DRBG_CTX *dctx, unsigned char *buf,

				unsigned char *in, size_t inlen)

	{

	size_t i = inlen;

	const unsigned char *q;

	unsigned char c, *p;

	p = buf + dctx->seedlen;

	q = in + inlen;



	OPENSSL_assert(i <= dctx->seedlen);



	/* Special case: zero length, just increment buffer */

	if (i)

		c = 0;

	else 

		c = 1;



	while (i)

		{

		int r;

		p--;

		q--;

		r = *p + *q + c;

		/* Carry */

		if (r > 0xff)

			c = 1;

		else

			c = 0;

		*p = r & 0xff;

		i--;

		}



	i = dctx->seedlen - inlen;



	/* If not adding whole buffer handle final carries */

	if (c && i)

		{

		do

			{

			p--;

			c = *p;

			c++;

			*p = c;

			if(c)

				return;

			} while(i--);

		}

	}



/* Finalise and add hash to V */

	

static int ctx_add_md(DRBG_CTX *dctx)

	{

	if (!FIPS_digestfinal(&dctx->d.hash.mctx, dctx->d.hash.vtmp, NULL))

			return 0;

	ctx_add_buf(dctx, dctx->d.hash.V, dctx->d.hash.vtmp, dctx->blocklength);

	return 1;

	}



static int hash_gen(DRBG_CTX *dctx, unsigned char *out, size_t outlen)

	{

	DRBG_HASH_CTX *hctx = &dctx->d.hash;

	if (outlen == 0)

		return 1;

	memcpy(hctx->vtmp, hctx->V, dctx->seedlen);

	for(;;)

		{

		FIPS_digestinit(&hctx->mctx, hctx->md);

		FIPS_digestupdate(&hctx->mctx, hctx->vtmp, dctx->seedlen);

		if (outlen < dctx->blocklength)

			{

			FIPS_digestfinal(&hctx->mctx, hctx->vtmp, NULL);

			memcpy(out, hctx->vtmp, outlen);

			return 1;

			}

		FIPS_digestfinal(&hctx->mctx, out, NULL);

		outlen -= dctx->blocklength;

		if (outlen == 0)

			return 1;

		out += dctx->blocklength;

		ctx_add_buf(dctx, hctx->vtmp, NULL, 0);

		}

	}



static int drbg_hash_instantiate(DRBG_CTX *dctx,

				const unsigned char *ent, size_t ent_len,

				const unsigned char *nonce, size_t nonce_len,

				const unsigned char *pstr, size_t pstr_len)

	{

	DRBG_HASH_CTX *hctx = &dctx->d.hash;

	if (!hash_df(dctx, hctx->V, 

			ent, ent_len, nonce, nonce_len, pstr, pstr_len,

			NULL, 0))

		return 0;

	if (!hash_df(dctx, hctx->C, 

			NULL, 0, hctx->V, dctx->seedlen,

			NULL, 0, NULL, 0))

		return 0;



#ifdef HASH_DRBG_TRACE

	fprintf(stderr, "V+C after instantiate:\n");

	hexprint(stderr, hctx->V, dctx->seedlen);

	hexprint(stderr, hctx->C, dctx->seedlen);

#endif

	return 1;

	}



	

static int drbg_hash_reseed(DRBG_CTX *dctx,

				const unsigned char *ent, size_t ent_len,

				const unsigned char *adin, size_t adin_len)

	{

	DRBG_HASH_CTX *hctx = &dctx->d.hash;

	/* V about to be updated so use C as output instead */

	if (!hash_df(dctx, hctx->C,

			NULL, 1, hctx->V, dctx->seedlen,

			ent, ent_len, adin, adin_len))

		return 0;

	memcpy(hctx->V, hctx->C, dctx->seedlen);

	if (!hash_df(dctx, hctx->C, NULL, 0,

			hctx->V, dctx->seedlen, NULL, 0, NULL, 0))

		return 0;

#ifdef HASH_DRBG_TRACE

	fprintf(stderr, "V+C after reseed:\n");

	hexprint(stderr, hctx->V, dctx->seedlen);

	hexprint(stderr, hctx->C, dctx->seedlen);

#endif

	return 1;

	}



static int drbg_hash_generate(DRBG_CTX *dctx,

				unsigned char *out, size_t outlen,

				const unsigned char *adin, size_t adin_len)

	{

	DRBG_HASH_CTX *hctx = &dctx->d.hash;

	EVP_MD_CTX *mctx = &hctx->mctx;

	unsigned char tmp[4];

	if (adin && adin_len)

		{

		tmp[0] = 2;

		if (!FIPS_digestinit(mctx, hctx->md))

			return 0;

		if (!EVP_DigestUpdate(mctx, tmp, 1))

			return 0;

		if (!EVP_DigestUpdate(mctx, hctx->V, dctx->seedlen))

			return 0;

		if (!EVP_DigestUpdate(mctx, adin, adin_len))

			return 0;

		if (!ctx_add_md(dctx))

			return 0;

		}

	if (!hash_gen(dctx, out, outlen))

		return 0;



	tmp[0] = 3;

	if (!FIPS_digestinit(mctx, hctx->md))

		return 0;

	if (!EVP_DigestUpdate(mctx, tmp, 1))

		return 0;

	if (!EVP_DigestUpdate(mctx, hctx->V, dctx->seedlen))

		return 0;



	if (!ctx_add_md(dctx))

		return 0;



	ctx_add_buf(dctx, hctx->V, hctx->C, dctx->seedlen);



	tmp[0] = (dctx->reseed_counter >> 24) & 0xff;

	tmp[1] = (dctx->reseed_counter >> 16) & 0xff;

	tmp[2] = (dctx->reseed_counter >> 8) & 0xff;

	tmp[3] = dctx->reseed_counter & 0xff;

	ctx_add_buf(dctx, hctx->V, tmp, 4);

#ifdef HASH_DRBG_TRACE

	fprintf(stderr, "V+C after generate:\n");

	hexprint(stderr, hctx->V, dctx->seedlen);

	hexprint(stderr, hctx->C, dctx->seedlen);

#endif

	return 1;

	}



int fips_drbg_hash_init(DRBG_CTX *dctx)

	{

	const EVP_MD *md;

	DRBG_HASH_CTX *hctx = &dctx->d.hash;

	switch (dctx->type)

		{

		case NID_sha1:

		md = EVP_sha1();

		dctx->strength = 128;

		break;



		case NID_sha224:

		md = EVP_sha224();

		dctx->strength = 192;

		break;



		case NID_sha256:

		md = EVP_sha256();

		dctx->strength = 256;

		break;



		case NID_sha384:

		md = EVP_sha384();

		dctx->strength = 256;

		break;



		case NID_sha512:

		md = EVP_sha512();

		dctx->strength = 256;

		break;



		default:

		return -2;

		break;



		}



	dctx->instantiate = drbg_hash_instantiate;

	dctx->reseed = drbg_hash_reseed;

	dctx->generate = drbg_hash_generate;



	dctx->d.hash.md = md;

	EVP_MD_CTX_init(&hctx->mctx);



	/* These are taken from SP 800-90 10.1 table 2 */



	dctx->blocklength = M_EVP_MD_size(md);

	if (dctx->blocklength > 32)

		dctx->seedlen = 111;

	else

		dctx->seedlen = 55;





	dctx->min_entropy = dctx->strength / 8;

	dctx->max_entropy = DRBG_MAX_ENTROPY;



	dctx->min_nonce = dctx->min_entropy / 2;

	dctx->max_nonce = DRBG_MAX_NONCE;



	dctx->max_pers = DRBG_MAX_LENGTH;

	dctx->max_adin = DRBG_MAX_LENGTH;



	dctx->max_request = 1<<19;



	return 1;

	}

fips/rand/fips_drbg_lib.c

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