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-rw-r--r--crypto/openssl/fips/rand/fips_rand.c410
1 files changed, 410 insertions, 0 deletions
diff --git a/crypto/openssl/fips/rand/fips_rand.c b/crypto/openssl/fips/rand/fips_rand.c
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+/* ====================================================================
+ * Copyright (c) 2007 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
+ * openssl-core@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.
+ *
+ */
+
+/*
+ * This is a FIPS approved AES PRNG based on ANSI X9.31 A.2.4.
+ */
+
+#include "e_os.h"
+
+/* If we don't define _XOPEN_SOURCE_EXTENDED, struct timeval won't
+ be defined and gettimeofday() won't be declared with strict compilers
+ like DEC C in ANSI C mode. */
+#ifndef _XOPEN_SOURCE_EXTENDED
+#define _XOPEN_SOURCE_EXTENDED 1
+#endif
+
+#include <openssl/rand.h>
+#include <openssl/aes.h>
+#include <openssl/err.h>
+#include <openssl/fips_rand.h>
+#ifndef OPENSSL_SYS_WIN32
+#include <sys/time.h>
+#endif
+#include <assert.h>
+#ifndef OPENSSL_SYS_WIN32
+# ifdef OPENSSL_UNISTD
+# include OPENSSL_UNISTD
+# else
+# include <unistd.h>
+# endif
+#endif
+#include <string.h>
+#include <openssl/fips.h>
+#include "fips_locl.h"
+
+#ifdef OPENSSL_FIPS
+
+void *OPENSSL_stderr(void);
+
+#define AES_BLOCK_LENGTH 16
+
+
+/* AES FIPS PRNG implementation */
+
+typedef struct
+ {
+ int seeded;
+ int keyed;
+ int test_mode;
+ int second;
+ int error;
+ unsigned long counter;
+ AES_KEY ks;
+ int vpos;
+ /* Temporary storage for key if it equals seed length */
+ unsigned char tmp_key[AES_BLOCK_LENGTH];
+ unsigned char V[AES_BLOCK_LENGTH];
+ unsigned char DT[AES_BLOCK_LENGTH];
+ unsigned char last[AES_BLOCK_LENGTH];
+ } FIPS_PRNG_CTX;
+
+static FIPS_PRNG_CTX sctx;
+
+static int fips_prng_fail = 0;
+
+void FIPS_rng_stick(void)
+ {
+ fips_prng_fail = 1;
+ }
+
+static void fips_rand_prng_reset(FIPS_PRNG_CTX *ctx)
+ {
+ ctx->seeded = 0;
+ ctx->keyed = 0;
+ ctx->test_mode = 0;
+ ctx->counter = 0;
+ ctx->second = 0;
+ ctx->error = 0;
+ ctx->vpos = 0;
+ OPENSSL_cleanse(ctx->V, AES_BLOCK_LENGTH);
+ OPENSSL_cleanse(&ctx->ks, sizeof(AES_KEY));
+ }
+
+
+static int fips_set_prng_key(FIPS_PRNG_CTX *ctx,
+ const unsigned char *key, FIPS_RAND_SIZE_T keylen)
+ {
+ FIPS_selftest_check();
+ if (keylen != 16 && keylen != 24 && keylen != 32)
+ {
+ /* error: invalid key size */
+ return 0;
+ }
+ AES_set_encrypt_key(key, keylen << 3, &ctx->ks);
+ if (keylen == 16)
+ {
+ memcpy(ctx->tmp_key, key, 16);
+ ctx->keyed = 2;
+ }
+ else
+ ctx->keyed = 1;
+ ctx->seeded = 0;
+ ctx->second = 0;
+ return 1;
+ }
+
+static int fips_set_prng_seed(FIPS_PRNG_CTX *ctx,
+ const unsigned char *seed, FIPS_RAND_SIZE_T seedlen)
+ {
+ int i;
+ if (!ctx->keyed)
+ return 0;
+ /* In test mode seed is just supplied data */
+ if (ctx->test_mode)
+ {
+ if (seedlen != AES_BLOCK_LENGTH)
+ return 0;
+ memcpy(ctx->V, seed, AES_BLOCK_LENGTH);
+ ctx->seeded = 1;
+ return 1;
+ }
+ /* Outside test mode XOR supplied data with existing seed */
+ for (i = 0; i < seedlen; i++)
+ {
+ ctx->V[ctx->vpos++] ^= seed[i];
+ if (ctx->vpos == AES_BLOCK_LENGTH)
+ {
+ ctx->vpos = 0;
+ /* Special case if first seed and key length equals
+ * block size check key and seed do not match.
+ */
+ if (ctx->keyed == 2)
+ {
+ if (!memcmp(ctx->tmp_key, ctx->V, 16))
+ {
+ RANDerr(RAND_F_FIPS_SET_PRNG_SEED,
+ RAND_R_PRNG_SEED_MUST_NOT_MATCH_KEY);
+ return 0;
+ }
+ OPENSSL_cleanse(ctx->tmp_key, 16);
+ ctx->keyed = 1;
+ }
+ ctx->seeded = 1;
+ }
+ }
+ return 1;
+ }
+
+static int fips_set_test_mode(FIPS_PRNG_CTX *ctx)
+ {
+ if (ctx->keyed)
+ {
+ RANDerr(RAND_F_FIPS_SET_TEST_MODE,RAND_R_PRNG_KEYED);
+ return 0;
+ }
+ ctx->test_mode = 1;
+ return 1;
+ }
+
+int FIPS_rand_test_mode(void)
+ {
+ return fips_set_test_mode(&sctx);
+ }
+
+int FIPS_rand_set_dt(unsigned char *dt)
+ {
+ if (!sctx.test_mode)
+ {
+ RANDerr(RAND_F_FIPS_RAND_SET_DT,RAND_R_NOT_IN_TEST_MODE);
+ return 0;
+ }
+ memcpy(sctx.DT, dt, AES_BLOCK_LENGTH);
+ return 1;
+ }
+
+static void fips_get_dt(FIPS_PRNG_CTX *ctx)
+ {
+#ifdef OPENSSL_SYS_WIN32
+ FILETIME ft;
+#else
+ struct timeval tv;
+#endif
+ unsigned char *buf = ctx->DT;
+
+#ifndef GETPID_IS_MEANINGLESS
+ unsigned long pid;
+#endif
+
+#ifdef OPENSSL_SYS_WIN32
+ GetSystemTimeAsFileTime(&ft);
+ buf[0] = (unsigned char) (ft.dwHighDateTime & 0xff);
+ buf[1] = (unsigned char) ((ft.dwHighDateTime >> 8) & 0xff);
+ buf[2] = (unsigned char) ((ft.dwHighDateTime >> 16) & 0xff);
+ buf[3] = (unsigned char) ((ft.dwHighDateTime >> 24) & 0xff);
+ buf[4] = (unsigned char) (ft.dwLowDateTime & 0xff);
+ buf[5] = (unsigned char) ((ft.dwLowDateTime >> 8) & 0xff);
+ buf[6] = (unsigned char) ((ft.dwLowDateTime >> 16) & 0xff);
+ buf[7] = (unsigned char) ((ft.dwLowDateTime >> 24) & 0xff);
+#else
+ gettimeofday(&tv,NULL);
+ buf[0] = (unsigned char) (tv.tv_sec & 0xff);
+ buf[1] = (unsigned char) ((tv.tv_sec >> 8) & 0xff);
+ buf[2] = (unsigned char) ((tv.tv_sec >> 16) & 0xff);
+ buf[3] = (unsigned char) ((tv.tv_sec >> 24) & 0xff);
+ buf[4] = (unsigned char) (tv.tv_usec & 0xff);
+ buf[5] = (unsigned char) ((tv.tv_usec >> 8) & 0xff);
+ buf[6] = (unsigned char) ((tv.tv_usec >> 16) & 0xff);
+ buf[7] = (unsigned char) ((tv.tv_usec >> 24) & 0xff);
+#endif
+ buf[8] = (unsigned char) (ctx->counter & 0xff);
+ buf[9] = (unsigned char) ((ctx->counter >> 8) & 0xff);
+ buf[10] = (unsigned char) ((ctx->counter >> 16) & 0xff);
+ buf[11] = (unsigned char) ((ctx->counter >> 24) & 0xff);
+
+ ctx->counter++;
+
+
+#ifndef GETPID_IS_MEANINGLESS
+ pid=(unsigned long)getpid();
+ buf[12] = (unsigned char) (pid & 0xff);
+ buf[13] = (unsigned char) ((pid >> 8) & 0xff);
+ buf[14] = (unsigned char) ((pid >> 16) & 0xff);
+ buf[15] = (unsigned char) ((pid >> 24) & 0xff);
+#endif
+ }
+
+static int fips_rand(FIPS_PRNG_CTX *ctx,
+ unsigned char *out, FIPS_RAND_SIZE_T outlen)
+ {
+ unsigned char R[AES_BLOCK_LENGTH], I[AES_BLOCK_LENGTH];
+ unsigned char tmp[AES_BLOCK_LENGTH];
+ int i;
+ if (ctx->error)
+ {
+ RANDerr(RAND_F_FIPS_RAND,RAND_R_PRNG_ERROR);
+ return 0;
+ }
+ if (!ctx->keyed)
+ {
+ RANDerr(RAND_F_FIPS_RAND,RAND_R_NO_KEY_SET);
+ return 0;
+ }
+ if (!ctx->seeded)
+ {
+ RANDerr(RAND_F_FIPS_RAND,RAND_R_PRNG_NOT_SEEDED);
+ return 0;
+ }
+ for (;;)
+ {
+ if (!ctx->test_mode)
+ fips_get_dt(ctx);
+ AES_encrypt(ctx->DT, I, &ctx->ks);
+ for (i = 0; i < AES_BLOCK_LENGTH; i++)
+ tmp[i] = I[i] ^ ctx->V[i];
+ AES_encrypt(tmp, R, &ctx->ks);
+ for (i = 0; i < AES_BLOCK_LENGTH; i++)
+ tmp[i] = R[i] ^ I[i];
+ AES_encrypt(tmp, ctx->V, &ctx->ks);
+ /* Continuous PRNG test */
+ if (ctx->second)
+ {
+ if (fips_prng_fail)
+ memcpy(ctx->last, R, AES_BLOCK_LENGTH);
+ if (!memcmp(R, ctx->last, AES_BLOCK_LENGTH))
+ {
+ RANDerr(RAND_F_FIPS_RAND,RAND_R_PRNG_STUCK);
+ ctx->error = 1;
+ fips_set_selftest_fail();
+ return 0;
+ }
+ }
+ memcpy(ctx->last, R, AES_BLOCK_LENGTH);
+ if (!ctx->second)
+ {
+ ctx->second = 1;
+ if (!ctx->test_mode)
+ continue;
+ }
+
+ if (outlen <= AES_BLOCK_LENGTH)
+ {
+ memcpy(out, R, outlen);
+ break;
+ }
+
+ memcpy(out, R, AES_BLOCK_LENGTH);
+ out += AES_BLOCK_LENGTH;
+ outlen -= AES_BLOCK_LENGTH;
+ }
+ return 1;
+ }
+
+
+int FIPS_rand_set_key(const unsigned char *key, FIPS_RAND_SIZE_T keylen)
+ {
+ int ret;
+ CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+ ret = fips_set_prng_key(&sctx, key, keylen);
+ CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+ return ret;
+ }
+
+int FIPS_rand_seed(const void *seed, FIPS_RAND_SIZE_T seedlen)
+ {
+ int ret;
+ CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+ ret = fips_set_prng_seed(&sctx, seed, seedlen);
+ CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+ return ret;
+ }
+
+
+int FIPS_rand_bytes(unsigned char *out, FIPS_RAND_SIZE_T count)
+ {
+ int ret;
+ CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+ ret = fips_rand(&sctx, out, count);
+ CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+ return ret;
+ }
+
+int FIPS_rand_status(void)
+ {
+ int ret;
+ CRYPTO_r_lock(CRYPTO_LOCK_RAND);
+ ret = sctx.seeded;
+ CRYPTO_r_unlock(CRYPTO_LOCK_RAND);
+ return ret;
+ }
+
+void FIPS_rand_reset(void)
+ {
+ CRYPTO_w_lock(CRYPTO_LOCK_RAND);
+ fips_rand_prng_reset(&sctx);
+ CRYPTO_w_unlock(CRYPTO_LOCK_RAND);
+ }
+
+static void fips_do_rand_seed(const void *seed, FIPS_RAND_SIZE_T seedlen)
+ {
+ FIPS_rand_seed(seed, seedlen);
+ }
+
+static void fips_do_rand_add(const void *seed, FIPS_RAND_SIZE_T seedlen,
+ double add_entropy)
+ {
+ FIPS_rand_seed(seed, seedlen);
+ }
+
+static const RAND_METHOD rand_fips_meth=
+ {
+ fips_do_rand_seed,
+ FIPS_rand_bytes,
+ FIPS_rand_reset,
+ fips_do_rand_add,
+ FIPS_rand_bytes,
+ FIPS_rand_status
+ };
+
+const RAND_METHOD *FIPS_rand_method(void)
+{
+ return &rand_fips_meth;
+}
+
+#endif
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