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diff -up openssl-1.1.1g/crypto/rand/build.info.crng-test openssl-1.1.1g/crypto/rand/build.info
--- openssl-1.1.1g/crypto/rand/build.info.crng-test 2020-04-23 13:30:45.863389837 +0200
+++ openssl-1.1.1g/crypto/rand/build.info 2020-04-23 13:31:55.847069892 +0200
@@ -1,6 +1,6 @@
LIBS=../../libcrypto
SOURCE[../../libcrypto]=\
- randfile.c rand_lib.c rand_err.c rand_egd.c \
+ randfile.c rand_lib.c rand_err.c rand_crng_test.c rand_egd.c \
rand_win.c rand_unix.c rand_vms.c drbg_lib.c drbg_ctr.c
INCLUDE[drbg_ctr.o]=../modes
diff -up openssl-1.1.1g/crypto/rand/drbg_lib.c.crng-test openssl-1.1.1g/crypto/rand/drbg_lib.c
--- openssl-1.1.1g/crypto/rand/drbg_lib.c.crng-test 2020-04-23 13:30:45.818390686 +0200
+++ openssl-1.1.1g/crypto/rand/drbg_lib.c 2020-04-23 13:30:45.864389819 +0200
@@ -67,7 +67,7 @@ static CRYPTO_THREAD_LOCAL private_drbg;
/* NIST SP 800-90A DRBG recommends the use of a personalization string. */
-static const char ossl_pers_string[] = "OpenSSL NIST SP 800-90A DRBG";
+static const char ossl_pers_string[] = DRBG_DEFAULT_PERS_STRING;
static CRYPTO_ONCE rand_drbg_init = CRYPTO_ONCE_STATIC_INIT;
@@ -201,8 +201,13 @@ static RAND_DRBG *rand_drbg_new(int secu
drbg->parent = parent;
if (parent == NULL) {
+#ifdef OPENSSL_FIPS
+ drbg->get_entropy = rand_crngt_get_entropy;
+ drbg->cleanup_entropy = rand_crngt_cleanup_entropy;
+#else
drbg->get_entropy = rand_drbg_get_entropy;
drbg->cleanup_entropy = rand_drbg_cleanup_entropy;
+#endif
#ifndef RAND_DRBG_GET_RANDOM_NONCE
drbg->get_nonce = rand_drbg_get_nonce;
drbg->cleanup_nonce = rand_drbg_cleanup_nonce;
diff -up openssl-1.1.1g/crypto/rand/rand_crng_test.c.crng-test openssl-1.1.1g/crypto/rand/rand_crng_test.c
--- openssl-1.1.1g/crypto/rand/rand_crng_test.c.crng-test 2020-04-23 13:30:45.864389819 +0200
+++ openssl-1.1.1g/crypto/rand/rand_crng_test.c 2020-04-23 13:30:45.864389819 +0200
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/*
+ * Implementation of the FIPS 140-2 section 4.9.2 Conditional Tests.
+ */
+
+#include <string.h>
+#include <openssl/evp.h>
+#include "crypto/rand.h"
+#include "internal/thread_once.h"
+#include "rand_local.h"
+
+static RAND_POOL *crngt_pool;
+static unsigned char crngt_prev[EVP_MAX_MD_SIZE];
+
+int (*crngt_get_entropy)(unsigned char *, unsigned char *, unsigned int *)
+ = &rand_crngt_get_entropy_cb;
+
+int rand_crngt_get_entropy_cb(unsigned char *buf, unsigned char *md,
+ unsigned int *md_size)
+{
+ int r;
+ size_t n;
+ unsigned char *p;
+
+ n = rand_pool_acquire_entropy(crngt_pool);
+ if (n >= CRNGT_BUFSIZ) {
+ p = rand_pool_detach(crngt_pool);
+ r = EVP_Digest(p, CRNGT_BUFSIZ, md, md_size, EVP_sha256(), NULL);
+ if (r != 0)
+ memcpy(buf, p, CRNGT_BUFSIZ);
+ rand_pool_reattach(crngt_pool, p);
+ return r;
+ }
+ return 0;
+}
+
+void rand_crngt_cleanup(void)
+{
+ rand_pool_free(crngt_pool);
+ crngt_pool = NULL;
+}
+
+int rand_crngt_init(void)
+{
+ unsigned char buf[CRNGT_BUFSIZ];
+
+ if ((crngt_pool = rand_pool_new(0, 1, CRNGT_BUFSIZ, CRNGT_BUFSIZ)) == NULL)
+ return 0;
+ if (crngt_get_entropy(buf, crngt_prev, NULL)) {
+ OPENSSL_cleanse(buf, sizeof(buf));
+ return 1;
+ }
+ rand_crngt_cleanup();
+ return 0;
+}
+
+static CRYPTO_ONCE rand_crngt_init_flag = CRYPTO_ONCE_STATIC_INIT;
+DEFINE_RUN_ONCE_STATIC(do_rand_crngt_init)
+{
+ return OPENSSL_init_crypto(0, NULL)
+ && rand_crngt_init()
+ && OPENSSL_atexit(&rand_crngt_cleanup);
+}
+
+int rand_crngt_single_init(void)
+{
+ return RUN_ONCE(&rand_crngt_init_flag, do_rand_crngt_init);
+}
+
+size_t rand_crngt_get_entropy(RAND_DRBG *drbg,
+ unsigned char **pout,
+ int entropy, size_t min_len, size_t max_len,
+ int prediction_resistance)
+{
+ unsigned char buf[CRNGT_BUFSIZ], md[EVP_MAX_MD_SIZE];
+ unsigned int sz;
+ RAND_POOL *pool;
+ size_t q, r = 0, s, t = 0;
+ int attempts = 3;
+
+ if (!RUN_ONCE(&rand_crngt_init_flag, do_rand_crngt_init))
+ return 0;
+
+ if ((pool = rand_pool_new(entropy, 1, min_len, max_len)) == NULL)
+ return 0;
+
+ while ((q = rand_pool_bytes_needed(pool, 1)) > 0 && attempts-- > 0) {
+ s = q > sizeof(buf) ? sizeof(buf) : q;
+ if (!crngt_get_entropy(buf, md, &sz)
+ || memcmp(crngt_prev, md, sz) == 0
+ || !rand_pool_add(pool, buf, s, s * 8))
+ goto err;
+ memcpy(crngt_prev, md, sz);
+ t += s;
+ attempts++;
+ }
+ r = t;
+ *pout = rand_pool_detach(pool);
+err:
+ OPENSSL_cleanse(buf, sizeof(buf));
+ rand_pool_free(pool);
+ return r;
+}
+
+void rand_crngt_cleanup_entropy(RAND_DRBG *drbg,
+ unsigned char *out, size_t outlen)
+{
+ OPENSSL_secure_clear_free(out, outlen);
+}
diff -up openssl-1.1.1g/crypto/rand/rand_local.h.crng-test openssl-1.1.1g/crypto/rand/rand_local.h
--- openssl-1.1.1g/crypto/rand/rand_local.h.crng-test 2020-04-23 13:30:45.470397250 +0200
+++ openssl-1.1.1g/crypto/rand/rand_local.h 2020-04-23 13:30:45.864389819 +0200
@@ -33,7 +33,15 @@
# define MASTER_RESEED_TIME_INTERVAL (60*60) /* 1 hour */
# define SLAVE_RESEED_TIME_INTERVAL (7*60) /* 7 minutes */
-
+/*
+ * The number of bytes that constitutes an atomic lump of entropy with respect
+ * to the FIPS 140-2 section 4.9.2 Conditional Tests. The size is somewhat
+ * arbitrary, the smaller the value, the less entropy is consumed on first
+ * read but the higher the probability of the test failing by accident.
+ *
+ * The value is in bytes.
+ */
+#define CRNGT_BUFSIZ 16
/*
* Maximum input size for the DRBG (entropy, nonce, personalization string)
@@ -44,6 +52,8 @@
*/
# define DRBG_MAX_LENGTH INT32_MAX
+/* The default nonce */
+# define DRBG_DEFAULT_PERS_STRING "OpenSSL NIST SP 800-90A DRBG"
/*
* Maximum allocation size for RANDOM_POOL buffers
@@ -296,4 +306,22 @@ int rand_drbg_enable_locking(RAND_DRBG *
/* initializes the AES-CTR DRBG implementation */
int drbg_ctr_init(RAND_DRBG *drbg);
+/*
+ * Entropy call back for the FIPS 140-2 section 4.9.2 Conditional Tests.
+ * These need to be exposed for the unit tests.
+ */
+int rand_crngt_get_entropy_cb(unsigned char *buf, unsigned char *md,
+ unsigned int *md_size);
+extern int (*crngt_get_entropy)(unsigned char *buf, unsigned char *md,
+ unsigned int *md_size);
+int rand_crngt_init(void);
+void rand_crngt_cleanup(void);
+
+/*
+ * Expose the run once initialisation function for the unit tests because.
+ * they need to restart from scratch to validate the first block is skipped
+ * properly.
+ */
+int rand_crngt_single_init(void);
+
#endif
diff -up openssl-1.1.1g/include/crypto/rand.h.crng-test openssl-1.1.1g/include/crypto/rand.h
--- openssl-1.1.1g/include/crypto/rand.h.crng-test 2020-04-23 13:30:45.824390573 +0200
+++ openssl-1.1.1g/include/crypto/rand.h 2020-04-23 13:30:45.864389819 +0200
@@ -49,6 +49,14 @@ size_t rand_drbg_get_additional_data(RAN
void rand_drbg_cleanup_additional_data(RAND_POOL *pool, unsigned char *out);
+/* CRNG test entropy filter callbacks. */
+size_t rand_crngt_get_entropy(RAND_DRBG *drbg,
+ unsigned char **pout,
+ int entropy, size_t min_len, size_t max_len,
+ int prediction_resistance);
+void rand_crngt_cleanup_entropy(RAND_DRBG *drbg,
+ unsigned char *out, size_t outlen);
+
/*
* RAND_POOL functions
*/
diff -up openssl-1.1.1g/test/drbgtest.c.crng-test openssl-1.1.1g/test/drbgtest.c
--- openssl-1.1.1g/test/drbgtest.c.crng-test 2020-04-21 14:22:39.000000000 +0200
+++ openssl-1.1.1g/test/drbgtest.c 2020-04-23 13:30:45.865389800 +0200
@@ -150,6 +150,31 @@ static size_t kat_nonce(RAND_DRBG *drbg,
return t->noncelen;
}
+ /*
+ * Disable CRNG testing if it is enabled.
+ * If the DRBG is ready or in an error state, this means an instantiate cycle
+ * for which the default personalisation string is used.
+ */
+static int disable_crngt(RAND_DRBG *drbg)
+{
+ static const char pers[] = DRBG_DEFAULT_PERS_STRING;
+ const int instantiate = drbg->state != DRBG_UNINITIALISED;
+
+ if (drbg->get_entropy != rand_crngt_get_entropy)
+ return 1;
+
+ if ((instantiate && !RAND_DRBG_uninstantiate(drbg))
+ || !TEST_true(RAND_DRBG_set_callbacks(drbg, &rand_drbg_get_entropy,
+ &rand_drbg_cleanup_entropy,
+ &rand_drbg_get_nonce,
+ &rand_drbg_cleanup_nonce))
+ || (instantiate
+ && !RAND_DRBG_instantiate(drbg, (const unsigned char *)pers,
+ sizeof(pers) - 1)))
+ return 0;
+ return 1;
+}
+
static int uninstantiate(RAND_DRBG *drbg)
{
int ret = drbg == NULL ? 1 : RAND_DRBG_uninstantiate(drbg);
@@ -175,7 +200,8 @@ static int single_kat(DRBG_SELFTEST_DATA
if (!TEST_ptr(drbg = RAND_DRBG_new(td->nid, td->flags, NULL)))
return 0;
if (!TEST_true(RAND_DRBG_set_callbacks(drbg, kat_entropy, NULL,
- kat_nonce, NULL))) {
+ kat_nonce, NULL))
+ || !TEST_true(disable_crngt(drbg))) {
failures++;
goto err;
}
@@ -293,7 +319,8 @@ static int error_check(DRBG_SELFTEST_DAT
unsigned int reseed_counter_tmp;
int ret = 0;
- if (!TEST_ptr(drbg = RAND_DRBG_new(0, 0, NULL)))
+ if (!TEST_ptr(drbg = RAND_DRBG_new(0, 0, NULL))
+ || !TEST_true(disable_crngt(drbg)))
goto err;
/*
@@ -740,6 +767,10 @@ static int test_rand_drbg_reseed(void)
|| !TEST_ptr_eq(private->parent, master))
return 0;
+ /* Disable CRNG testing for the master DRBG */
+ if (!TEST_true(disable_crngt(master)))
+ return 0;
+
/* uninstantiate the three global DRBGs */
RAND_DRBG_uninstantiate(private);
RAND_DRBG_uninstantiate(public);
@@ -964,7 +995,8 @@ static int test_rand_seed(void)
size_t rand_buflen;
size_t required_seed_buflen = 0;
- if (!TEST_ptr(master = RAND_DRBG_get0_master()))
+ if (!TEST_ptr(master = RAND_DRBG_get0_master())
+ || !TEST_true(disable_crngt(master)))
return 0;
#ifdef OPENSSL_RAND_SEED_NONE
@@ -1013,6 +1045,95 @@ static int test_rand_add(void)
return 1;
}
+/*
+ * A list of the FIPS DRGB types.
+ */
+static const struct s_drgb_types {
+ int nid;
+ int flags;
+} drgb_types[] = {
+ { NID_aes_128_ctr, 0 },
+ { NID_aes_192_ctr, 0 },
+ { NID_aes_256_ctr, 0 },
+};
+
+/* Six cases for each covers seed sizes up to 32 bytes */
+static const size_t crngt_num_cases = 6;
+
+static size_t crngt_case, crngt_idx;
+
+static int crngt_entropy_cb(unsigned char *buf, unsigned char *md,
+ unsigned int *md_size)
+{
+ size_t i, z;
+
+ if (!TEST_int_lt(crngt_idx, crngt_num_cases))
+ return 0;
+ /* Generate a block of unique data unless this is the duplication point */
+ z = crngt_idx++;
+ if (z > 0 && crngt_case == z)
+ z--;
+ for (i = 0; i < CRNGT_BUFSIZ; i++)
+ buf[i] = (unsigned char)(i + 'A' + z);
+ return EVP_Digest(buf, CRNGT_BUFSIZ, md, md_size, EVP_sha256(), NULL);
+}
+
+static int test_crngt(int n)
+{
+ const struct s_drgb_types *dt = drgb_types + n / crngt_num_cases;
+ RAND_DRBG *drbg = NULL;
+ unsigned char buff[100];
+ size_t ent;
+ int res = 0;
+ int expect;
+
+ if (!TEST_true(rand_crngt_single_init()))
+ return 0;
+ rand_crngt_cleanup();
+
+ if (!TEST_ptr(drbg = RAND_DRBG_new(dt->nid, dt->flags, NULL)))
+ return 0;
+ ent = (drbg->min_entropylen + CRNGT_BUFSIZ - 1) / CRNGT_BUFSIZ;
+ crngt_case = n % crngt_num_cases;
+ crngt_idx = 0;
+ crngt_get_entropy = &crngt_entropy_cb;
+ if (!TEST_true(rand_crngt_init()))
+ goto err;
+#ifndef OPENSSL_FIPS
+ if (!TEST_true(RAND_DRBG_set_callbacks(drbg, &rand_crngt_get_entropy,
+ &rand_crngt_cleanup_entropy,
+ &rand_drbg_get_nonce,
+ &rand_drbg_cleanup_nonce)))
+ goto err;
+#endif
+ expect = crngt_case == 0 || crngt_case > ent;
+ if (!TEST_int_eq(RAND_DRBG_instantiate(drbg, NULL, 0), expect))
+ goto err;
+ if (!expect)
+ goto fin;
+ if (!TEST_true(RAND_DRBG_generate(drbg, buff, sizeof(buff), 0, NULL, 0)))
+ goto err;
+
+ expect = crngt_case == 0 || crngt_case > 2 * ent;
+ if (!TEST_int_eq(RAND_DRBG_reseed(drbg, NULL, 0, 0), expect))
+ goto err;
+ if (!expect)
+ goto fin;
+ if (!TEST_true(RAND_DRBG_generate(drbg, buff, sizeof(buff), 0, NULL, 0)))
+ goto err;
+
+fin:
+ res = 1;
+err:
+ if (!res)
+ TEST_note("DRBG %zd case %zd block %zd", n / crngt_num_cases,
+ crngt_case, crngt_idx);
+ uninstantiate(drbg);
+ RAND_DRBG_free(drbg);
+ crngt_get_entropy = &rand_crngt_get_entropy_cb;
+ return res;
+}
+
int setup_tests(void)
{
app_data_index = RAND_DRBG_get_ex_new_index(0L, NULL, NULL, NULL, NULL);
@@ -1025,5 +1146,6 @@ int setup_tests(void)
#if defined(OPENSSL_THREADS)
ADD_TEST(test_multi_thread);
#endif
+ ADD_ALL_TESTS(test_crngt, crngt_num_cases * OSSL_NELEM(drgb_types));
return 1;
}
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