Add m-esr52 at 52.6.0

1 files changed, 968 insertions, 0 deletions

diff --git a/security/nss/lib/freebl/drbg.c b/security/nss/lib/freebl/drbg.c
new file mode 100644
index 000000000..ac0bba6e0
--- /dev/null
+++ b/security/nss/lib/freebl/drbg.c
@@ -0,0 +1,968 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifdef FREEBL_NO_DEPEND
+#include "stubs.h"
+#endif
+
+#include "prerror.h"
+#include "secerr.h"
+
+#include "prtypes.h"
+#include "prinit.h"
+#include "blapi.h"
+#include "blapii.h"
+#include "nssilock.h"
+#include "secitem.h"
+#include "sha_fast.h"
+#include "sha256.h"
+#include "secrng.h" /* for RNG_SystemRNG() */
+#include "secmpi.h"
+
+#ifdef UNSAFE_FUZZER_MODE
+#include "det_rng.h"
+#endif
+
+/* PRNG_SEEDLEN defined in NIST SP 800-90 section 10.1
+ * for SHA-1, SHA-224, and SHA-256 it's 440 bits.
+ * for SHA-384 and SHA-512 it's 888 bits */
+#define PRNG_SEEDLEN (440 / PR_BITS_PER_BYTE)
+#define PRNG_MAX_ADDITIONAL_BYTES PR_INT64(0x100000000)
+/* 2^35 bits or 2^32 bytes */
+#define PRNG_MAX_REQUEST_SIZE 0x10000             /* 2^19 bits or 2^16 bytes */
+#define PRNG_ADDITONAL_DATA_CACHE_SIZE (8 * 1024) /* must be less than          \
+                                                   *  PRNG_MAX_ADDITIONAL_BYTES \
+                                                   */
+
+/* RESEED_COUNT is how many calls to the prng before we need to reseed
+ * under normal NIST rules, you must return an error. In the NSS case, we
+ * self-reseed with RNG_SystemRNG(). Count can be a large number. For code
+ * simplicity, we specify count with 2 components: RESEED_BYTE (which is
+ * the same as LOG256(RESEED_COUNT)) and RESEED_VALUE (which is the same as
+ * RESEED_COUNT / (256 ^ RESEED_BYTE)). Another way to look at this is
+ * RESEED_COUNT = RESEED_VALUE * (256 ^ RESEED_BYTE). For Hash based DRBG
+ * we use the maximum count value, 2^48, or RESEED_BYTE=6 and RESEED_VALUE=1
+ */
+#define RESEED_BYTE 6
+#define RESEED_VALUE 1
+
+#define PRNG_RESET_RESEED_COUNT(rng)                                    \
+    PORT_Memset((rng)->reseed_counter, 0, sizeof(rng)->reseed_counter); \
+    (rng)->reseed_counter[RESEED_BYTE] = 1;
+
+/*
+ * The actual values of this enum are specified in SP 800-90, 10.1.1.*
+ * The spec does not name the types, it only uses bare values
+ */
+typedef enum {
+    prngCGenerateType = 0,      /* used when creating a new 'C' */
+    prngReseedType = 1,         /* used in reseeding */
+    prngAdditionalDataType = 2, /* used in mixing additional data */
+    prngGenerateByteType = 3    /* used when mixing internal state while
+                 * generating bytes */
+} prngVTypes;
+
+/*
+ * Global RNG context
+ */
+struct RNGContextStr {
+    PZLock *lock; /* Lock to serialize access to global rng */
+    /*
+     * NOTE, a number of steps in the drbg algorithm need to hash
+     * V_type || V. The code, therefore, depends on the V array following
+     * immediately after V_type to avoid extra copies. To accomplish this
+     * in a way that compiliers can't perturb, we declare V_type and V
+     * as a V_Data array and reference them by macros */
+    PRUint8 V_Data[PRNG_SEEDLEN + 1]; /* internal state variables */
+#define V_type V_Data[0]
+#define V(rng) (((rng)->V_Data) + 1)
+#define VSize(rng) ((sizeof(rng)->V_Data) - 1)
+    PRUint8 C[PRNG_SEEDLEN];           /* internal state variables */
+    PRUint8 lastOutput[SHA256_LENGTH]; /* for continuous rng checking */
+    /* If we get calls for the PRNG to return less than the length of our
+     * hash, we extend the request for a full hash (since we'll be doing
+     * the full hash anyway). Future requests for random numbers are fulfilled
+     * from the remainder of the bytes we generated. Requests for bytes longer
+     * than the hash size are fulfilled directly from the HashGen function
+     * of the random number generator. */
+    PRUint8 reseed_counter[RESEED_BYTE + 1]; /* number of requests since the
+                                              * last reseed. Need only be
+                                              * big enough to hold the whole
+                                              * reseed count */
+    PRUint8 data[SHA256_LENGTH];             /* when we request less than a block
+                                              * save the rest of the rng output for
+                                              * another partial block */
+    PRUint8 dataAvail;                       /* # bytes of output available in our cache,
+                                              * [0...SHA256_LENGTH] */
+    /* store additional data that has been shovelled off to us by
+     * RNG_RandomUpdate. */
+    PRUint8 additionalDataCache[PRNG_ADDITONAL_DATA_CACHE_SIZE];
+    PRUint32 additionalAvail;
+    PRBool isValid;   /* false if RNG reaches an invalid state */
+    PRBool isKatTest; /* true if running NIST PRNG KAT tests */
+};
+
+typedef struct RNGContextStr RNGContext;
+static RNGContext *globalrng = NULL;
+static RNGContext theGlobalRng;
+
+/*
+ * The next several functions are derived from the NIST SP 800-90
+ * spec. In these functions, an attempt was made to use names consistent
+ * with the names in the spec, even if they differ from normal NSS usage.
+ */
+
+/*
+ * Hash Derive function defined in NISP SP 800-90 Section 10.4.1.
+ * This function is used in the Instantiate and Reseed functions.
+ *
+ * NOTE: requested_bytes cannot overlap with input_string_1 or input_string_2.
+ * input_string_1 and input_string_2 are logically concatentated.
+ * input_string_1 must be supplied.
+ * if input_string_2 is not supplied, NULL should be passed for this parameter.
+ */
+static SECStatus
+prng_Hash_df(PRUint8 *requested_bytes, unsigned int no_of_bytes_to_return,
+             const PRUint8 *input_string_1, unsigned int input_string_1_len,
+             const PRUint8 *input_string_2, unsigned int input_string_2_len)
+{
+    SHA256Context ctx;
+    PRUint32 tmp;
+    PRUint8 counter;
+
+    tmp = SHA_HTONL(no_of_bytes_to_return * 8);
+
+    for (counter = 1; no_of_bytes_to_return > 0; counter++) {
+        unsigned int hash_return_len;
+        SHA256_Begin(&ctx);
+        SHA256_Update(&ctx, &counter, 1);
+        SHA256_Update(&ctx, (unsigned char *)&tmp, sizeof tmp);
+        SHA256_Update(&ctx, input_string_1, input_string_1_len);
+        if (input_string_2) {
+            SHA256_Update(&ctx, input_string_2, input_string_2_len);
+        }
+        SHA256_End(&ctx, requested_bytes, &hash_return_len,
+                   no_of_bytes_to_return);
+        requested_bytes += hash_return_len;
+        no_of_bytes_to_return -= hash_return_len;
+    }
+    return SECSuccess;
+}
+
+/*
+ * Hash_DRBG Instantiate NIST SP 800-90 10.1.1.2
+ *
+ * NOTE: bytes & len are entropy || nonce || personalization_string. In
+ * normal operation, NSS calculates them all together in a single call.
+ */
+static SECStatus
+prng_instantiate(RNGContext *rng, const PRUint8 *bytes, unsigned int len)
+{
+    if (!rng->isKatTest && len < PRNG_SEEDLEN) {
+        /* If the seedlen is too small, it's probably because we failed to get
+         * enough random data.
+         * This is stricter than NIST SP800-90A requires. Don't enforce it for
+         * tests. */
+        PORT_SetError(SEC_ERROR_NEED_RANDOM);
+        return SECFailure;
+    }
+    prng_Hash_df(V(rng), VSize(rng), bytes, len, NULL, 0);
+    rng->V_type = prngCGenerateType;
+    prng_Hash_df(rng->C, sizeof rng->C, rng->V_Data, sizeof rng->V_Data, NULL, 0);
+    PRNG_RESET_RESEED_COUNT(rng)
+    return SECSuccess;
+}
+
+/*
+ * Update the global random number generator with more seeding
+ * material. Use the Hash_DRBG reseed algorithm from NIST SP-800-90
+ * section 10.1.1.3
+ *
+ * If entropy is NULL, it is fetched from the noise generator.
+ */
+static SECStatus
+prng_reseed(RNGContext *rng, const PRUint8 *entropy, unsigned int entropy_len,
+            const PRUint8 *additional_input, unsigned int additional_input_len)
+{
+    PRUint8 noiseData[(sizeof rng->V_Data) + PRNG_SEEDLEN];
+    PRUint8 *noise = &noiseData[0];
+
+    /* if entropy wasn't supplied, fetch it. (normal operation case) */
+    if (entropy == NULL) {
+        entropy_len = (unsigned int)RNG_SystemRNG(
+            &noiseData[sizeof rng->V_Data], PRNG_SEEDLEN);
+    } else {
+        /* NOTE: this code is only available for testing, not to applications */
+        /* if entropy was too big for the stack variable, get it from malloc */
+        if (entropy_len > PRNG_SEEDLEN) {
+            noise = PORT_Alloc(entropy_len + (sizeof rng->V_Data));
+            if (noise == NULL) {
+                return SECFailure;
+            }
+        }
+        PORT_Memcpy(&noise[sizeof rng->V_Data], entropy, entropy_len);
+    }
+
+    if (entropy_len < 256 / PR_BITS_PER_BYTE) {
+        /* noise == &noiseData[0] at this point, so nothing to free */
+        PORT_SetError(SEC_ERROR_NEED_RANDOM);
+        return SECFailure;
+    }
+
+    rng->V_type = prngReseedType;
+    PORT_Memcpy(noise, rng->V_Data, sizeof rng->V_Data);
+    prng_Hash_df(V(rng), VSize(rng), noise, (sizeof rng->V_Data) + entropy_len,
+                 additional_input, additional_input_len);
+    /* clear potential CSP */
+    PORT_Memset(noise, 0, (sizeof rng->V_Data) + entropy_len);
+    rng->V_type = prngCGenerateType;
+    prng_Hash_df(rng->C, sizeof rng->C, rng->V_Data, sizeof rng->V_Data, NULL, 0);
+    PRNG_RESET_RESEED_COUNT(rng)
+
+    if (noise != &noiseData[0]) {
+        PORT_Free(noise);
+    }
+    return SECSuccess;
+}
+
+/*
+ * SP 800-90 requires we rerun our health tests on reseed
+ */
+static SECStatus
+prng_reseed_test(RNGContext *rng, const PRUint8 *entropy,
+                 unsigned int entropy_len, const PRUint8 *additional_input,
+                 unsigned int additional_input_len)
+{
+    SECStatus rv;
+
+    /* do health checks in FIPS mode */
+    rv = PRNGTEST_RunHealthTests();
+    if (rv != SECSuccess) {
+        /* error set by PRNGTEST_RunHealTests() */
+        rng->isValid = PR_FALSE;
+        return SECFailure;
+    }
+    return prng_reseed(rng, entropy, entropy_len,
+                       additional_input, additional_input_len);
+}
+
+/*
+ * build some fast inline functions for adding.
+ */
+#define PRNG_ADD_CARRY_ONLY(dest, start, carry)    \
+    {                                              \
+        int k1;                                    \
+        for (k1 = start; carry && k1 >= 0; k1--) { \
+            carry = !(++dest[k1]);                 \
+        }                                          \
+    }
+
+/*
+ * NOTE: dest must be an array for the following to work.
+ */
+#define PRNG_ADD_BITS(dest, dest_len, add, len, carry)               \
+    carry = 0;                                                       \
+    PORT_Assert((dest_len) >= (len));                                \
+    {                                                                \
+        int k1, k2;                                                  \
+        for (k1 = dest_len - 1, k2 = len - 1; k2 >= 0; --k1, --k2) { \
+            carry += dest[k1] + add[k2];                             \
+            dest[k1] = (PRUint8)carry;                               \
+            carry >>= 8;                                             \
+        }                                                            \
+    }
+
+#define PRNG_ADD_BITS_AND_CARRY(dest, dest_len, add, len, carry) \
+    PRNG_ADD_BITS(dest, dest_len, add, len, carry)               \
+    PRNG_ADD_CARRY_ONLY(dest, dest_len - len - 1, carry)
+
+/*
+ * This function expands the internal state of the prng to fulfill any number
+ * of bytes we need for this request. We only use this call if we need more
+ * than can be supplied by a single call to SHA256_HashBuf.
+ *
+ * This function is specified in NIST SP 800-90 section 10.1.1.4, Hashgen
+ */
+static void
+prng_Hashgen(RNGContext *rng, PRUint8 *returned_bytes,
+             unsigned int no_of_returned_bytes)
+{
+    PRUint8 data[VSize(rng)];
+    PRUint8 thisHash[SHA256_LENGTH];
+    PRUint8 *lastHash = rng->lastOutput;
+
+    PORT_Memcpy(data, V(rng), VSize(rng));
+    while (no_of_returned_bytes) {
+        SHA256Context ctx;
+        unsigned int len;
+        unsigned int carry;
+
+        SHA256_Begin(&ctx);
+        SHA256_Update(&ctx, data, sizeof data);
+        SHA256_End(&ctx, thisHash, &len, SHA256_LENGTH);
+        if (PORT_Memcmp(lastHash, thisHash, len) == 0) {
+            rng->isValid = PR_FALSE;
+            break;
+        }
+        if (no_of_returned_bytes < SHA256_LENGTH) {
+            len = no_of_returned_bytes;
+        }
+        PORT_Memcpy(returned_bytes, thisHash, len);
+        lastHash = returned_bytes;
+        returned_bytes += len;
+        no_of_returned_bytes -= len;
+        /* The carry parameter is a bool (increment or not).
+     * This increments data if no_of_returned_bytes is not zero */
+        carry = no_of_returned_bytes;
+        PRNG_ADD_CARRY_ONLY(data, (sizeof data) - 1, carry);
+    }
+    PORT_Memcpy(rng->lastOutput, thisHash, SHA256_LENGTH);
+    PORT_Memset(data, 0, sizeof data);
+    PORT_Memset(thisHash, 0, sizeof thisHash);
+}
+
+/*
+ * Generates new random bytes and advances the internal prng state.
+ * additional bytes are only used in algorithm testing.
+ *
+ * This function is specified in NIST SP 800-90 section 10.1.1.4
+ */
+static SECStatus
+prng_generateNewBytes(RNGContext *rng,
+                      PRUint8 *returned_bytes, unsigned int no_of_returned_bytes,
+                      const PRUint8 *additional_input,
+                      unsigned int additional_input_len)
+{
+    PRUint8 H[SHA256_LENGTH]; /* both H and w since they
+                   * aren't used concurrently */
+    unsigned int carry;
+
+    if (!rng->isValid) {
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    /* This code only triggers during tests, normal
+     * prng operation does not use additional_input */
+    if (additional_input) {
+        SHA256Context ctx;
+/* NIST SP 800-90 defines two temporaries in their calculations,
+     * w and H. These temporaries are the same lengths, and used
+     * at different times, so we use the following macro to collapse
+     * them to the same variable, but keeping their unique names for
+     * easy comparison to the spec */
+#define w H
+        rng->V_type = prngAdditionalDataType;
+        SHA256_Begin(&ctx);
+        SHA256_Update(&ctx, rng->V_Data, sizeof rng->V_Data);
+        SHA256_Update(&ctx, additional_input, additional_input_len);
+        SHA256_End(&ctx, w, NULL, sizeof w);
+        PRNG_ADD_BITS_AND_CARRY(V(rng), VSize(rng), w, sizeof w, carry)
+        PORT_Memset(w, 0, sizeof w);
+#undef w
+    }
+
+    if (no_of_returned_bytes == SHA256_LENGTH) {
+        /* short_cut to hashbuf and a couple of copies and clears */
+        SHA256_HashBuf(returned_bytes, V(rng), VSize(rng));
+        /* continuous rng check */
+        if (memcmp(rng->lastOutput, returned_bytes, SHA256_LENGTH) == 0) {
+            rng->isValid = PR_FALSE;
+        }
+        PORT_Memcpy(rng->lastOutput, returned_bytes, sizeof rng->lastOutput);
+    } else {
+        prng_Hashgen(rng, returned_bytes, no_of_returned_bytes);
+    }
+    /* advance our internal state... */
+    rng->V_type = prngGenerateByteType;
+    SHA256_HashBuf(H, rng->V_Data, sizeof rng->V_Data);
+    PRNG_ADD_BITS_AND_CARRY(V(rng), VSize(rng), H, sizeof H, carry)
+    PRNG_ADD_BITS(V(rng), VSize(rng), rng->C, sizeof rng->C, carry);
+    PRNG_ADD_BITS_AND_CARRY(V(rng), VSize(rng), rng->reseed_counter,
+                            sizeof rng->reseed_counter, carry)
+    carry = 1;
+    PRNG_ADD_CARRY_ONLY(rng->reseed_counter, (sizeof rng->reseed_counter) - 1, carry);
+
+    /* if the prng failed, don't return any output, signal softoken */
+    if (!rng->isValid) {
+        PORT_Memset(returned_bytes, 0, no_of_returned_bytes);
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    return SECSuccess;
+}
+
+/* Use NSPR to prevent RNG_RNGInit from being called from separate
+ * threads, creating a race condition.
+ */
+static const PRCallOnceType pristineCallOnce;
+static PRCallOnceType coRNGInit;
+static PRStatus
+rng_init(void)
+{
+    PRUint8 bytes[PRNG_SEEDLEN * 2]; /* entropy + nonce */
+    unsigned int numBytes;
+    SECStatus rv = SECSuccess;
+
+    if (globalrng == NULL) {
+        /* bytes needs to have enough space to hold
+     * a SHA256 hash value. Blow up at compile time if this isn't true */
+        PR_STATIC_ASSERT(sizeof(bytes) >= SHA256_LENGTH);
+        /* create a new global RNG context */
+        globalrng = &theGlobalRng;
+        PORT_Assert(NULL == globalrng->lock);
+        /* create a lock for it */
+        globalrng->lock = PZ_NewLock(nssILockOther);
+        if (globalrng->lock == NULL) {
+            globalrng = NULL;
+            PORT_SetError(PR_OUT_OF_MEMORY_ERROR);
+            return PR_FAILURE;
+        }
+
+        /* Try to get some seed data for the RNG */
+        numBytes = (unsigned int)RNG_SystemRNG(bytes, sizeof bytes);
+        PORT_Assert(numBytes == 0 || numBytes == sizeof bytes);
+        if (numBytes != 0) {
+            /* if this is our first call,  instantiate, otherwise reseed
+             * prng_instantiate gets a new clean state, we want to mix
+             * any previous entropy we may have collected */
+            if (V(globalrng)[0] == 0) {
+                rv = prng_instantiate(globalrng, bytes, numBytes);
+            } else {
+                rv = prng_reseed_test(globalrng, bytes, numBytes, NULL, 0);
+            }
+            memset(bytes, 0, numBytes);
+        } else {
+            PZ_DestroyLock(globalrng->lock);
+            globalrng->lock = NULL;
+            globalrng = NULL;
+            return PR_FAILURE;
+        }
+
+        if (rv != SECSuccess) {
+            return PR_FAILURE;
+        }
+        /* the RNG is in a valid state */
+        globalrng->isValid = PR_TRUE;
+        globalrng->isKatTest = PR_FALSE;
+
+        /* fetch one random value so that we can populate rng->oldV for our
+         * continous random number test. */
+        prng_generateNewBytes(globalrng, bytes, SHA256_LENGTH, NULL, 0);
+
+        /* Fetch more entropy into the PRNG */
+        RNG_SystemInfoForRNG();
+    }
+    return PR_SUCCESS;
+}
+
+/*
+ * Clean up the global RNG context
+ */
+static void
+prng_freeRNGContext(RNGContext *rng)
+{
+    PRUint8 inputhash[VSize(rng) + (sizeof rng->C)];
+
+    /* destroy context lock */
+    SKIP_AFTER_FORK(PZ_DestroyLock(globalrng->lock));
+
+    /* zero global RNG context except for C & V to preserve entropy */
+    prng_Hash_df(inputhash, sizeof rng->C, rng->C, sizeof rng->C, NULL, 0);
+    prng_Hash_df(&inputhash[sizeof rng->C], VSize(rng), V(rng), VSize(rng),
+                 NULL, 0);
+    memset(rng, 0, sizeof *rng);
+    memcpy(rng->C, inputhash, sizeof rng->C);
+    memcpy(V(rng), &inputhash[sizeof rng->C], VSize(rng));
+
+    memset(inputhash, 0, sizeof inputhash);
+}
+
+/*
+ * Public functions
+ */
+
+/*
+ * Initialize the global RNG context and give it some seed input taken
+ * from the system.  This function is thread-safe and will only allow
+ * the global context to be initialized once.  The seed input is likely
+ * small, so it is imperative that RNG_RandomUpdate() be called with
+ * additional seed data before the generator is used.  A good way to
+ * provide the generator with additional entropy is to call
+ * RNG_SystemInfoForRNG().  Note that C_Initialize() does exactly that.
+ */
+SECStatus
+RNG_RNGInit(void)
+{
+    /* Allow only one call to initialize the context */
+    PR_CallOnce(&coRNGInit, rng_init);
+    /* Make sure there is a context */
+    return (globalrng != NULL) ? SECSuccess : SECFailure;
+}
+
+/*
+** Update the global random number generator with more seeding
+** material.
+*/
+SECStatus
+RNG_RandomUpdate(const void *data, size_t bytes)
+{
+    SECStatus rv;
+
+    /* Make sure our assumption that size_t is unsigned is true */
+    PR_STATIC_ASSERT(((size_t)-1) > (size_t)1);
+
+#if defined(NS_PTR_GT_32) || (defined(NSS_USE_64) && !defined(NS_PTR_LE_32))
+    /*
+     * NIST 800-90 requires us to verify our inputs. This value can
+     * come from the application, so we need to make sure it's within the
+     * spec. The spec says it must be less than 2^32 bytes (2^35 bits).
+     * This can only happen if size_t is greater than 32 bits (i.e. on
+     * most 64 bit platforms). The 90% case (perhaps 100% case), size_t
+     * is less than or equal to 32 bits if the platform is not 64 bits, and
+     * greater than 32 bits if it is a 64 bit platform. The corner
+     * cases are handled with explicit defines NS_PTR_GT_32 and NS_PTR_LE_32.
+     *
+     * In general, neither NS_PTR_GT_32 nor NS_PTR_LE_32 will need to be
+     * defined. If you trip over the next two size ASSERTS at compile time,
+     * you will need to define them for your platform.
+     *
+     * if 'sizeof(size_t) > 4' is triggered it means that we were expecting
+     *   sizeof(size_t) to be greater than 4, but it wasn't. Setting
+     *   NS_PTR_LE_32 will correct that mistake.
+     *
+     * if 'sizeof(size_t) <= 4' is triggered, it means that we were expecting
+     *   sizeof(size_t) to be less than or equal to 4, but it wasn't. Setting
+     *   NS_PTR_GT_32 will correct that mistake.
+     */
+
+    PR_STATIC_ASSERT(sizeof(size_t) > 4);
+
+    if (bytes > (size_t)PRNG_MAX_ADDITIONAL_BYTES) {
+        bytes = PRNG_MAX_ADDITIONAL_BYTES;
+    }
+#else
+    PR_STATIC_ASSERT(sizeof(size_t) <= 4);
+#endif
+
+    PZ_Lock(globalrng->lock);
+    /* if we're passed more than our additionalDataCache, simply
+     * call reseed with that data */
+    if (bytes > sizeof(globalrng->additionalDataCache)) {
+        rv = prng_reseed_test(globalrng, NULL, 0, data, (unsigned int)bytes);
+        /* if we aren't going to fill or overflow the buffer, just cache it */
+    } else if (bytes < ((sizeof globalrng->additionalDataCache) - globalrng->additionalAvail)) {
+        PORT_Memcpy(globalrng->additionalDataCache + globalrng->additionalAvail,
+                    data, bytes);
+        globalrng->additionalAvail += (PRUint32)bytes;
+        rv = SECSuccess;
+    } else {
+        /* we are going to fill or overflow the buffer. In this case we will
+         * fill the entropy buffer, reseed with it, start a new buffer with the
+         * remainder. We know the remainder will fit in the buffer because
+         * we already handled the case where bytes > the size of the buffer.
+         */
+        size_t bufRemain = (sizeof globalrng->additionalDataCache) - globalrng->additionalAvail;
+        /* fill the rest of the buffer */
+        if (bufRemain) {
+            PORT_Memcpy(globalrng->additionalDataCache + globalrng->additionalAvail,
+                        data, bufRemain);
+            data = ((unsigned char *)data) + bufRemain;
+            bytes -= bufRemain;
+        }
+        /* reseed from buffer */
+        rv = prng_reseed_test(globalrng, NULL, 0,
+                              globalrng->additionalDataCache,
+                              sizeof globalrng->additionalDataCache);
+
+        /* copy the rest into the cache */
+        PORT_Memcpy(globalrng->additionalDataCache, data, bytes);
+        globalrng->additionalAvail = (PRUint32)bytes;
+    }
+
+    PZ_Unlock(globalrng->lock);
+    return rv;
+}
+
+/*
+** Generate some random bytes, using the global random number generator
+** object.
+*/
+static SECStatus
+prng_GenerateGlobalRandomBytes(RNGContext *rng,
+                               void *dest, size_t len)
+{
+    SECStatus rv = SECSuccess;
+    PRUint8 *output = dest;
+    /* check for a valid global RNG context */
+    PORT_Assert(rng != NULL);
+    if (rng == NULL) {
+        PORT_SetError(SEC_ERROR_INVALID_ARGS);
+        return SECFailure;
+    }
+    /* FIPS limits the amount of entropy available in a single request */
+    if (len > PRNG_MAX_REQUEST_SIZE) {
+        PORT_SetError(SEC_ERROR_INVALID_ARGS);
+        return SECFailure;
+    }
+    /* --- LOCKED --- */
+    PZ_Lock(rng->lock);
+    /* Check the amount of seed data in the generator.  If not enough,
+     * don't produce any data.
+     */
+    if (rng->reseed_counter[0] >= RESEED_VALUE) {
+        rv = prng_reseed_test(rng, NULL, 0, NULL, 0);
+        PZ_Unlock(rng->lock);
+        if (rv != SECSuccess) {
+            return rv;
+        }
+        RNG_SystemInfoForRNG();
+        PZ_Lock(rng->lock);
+    }
+    /*
+     * see if we have enough bytes to fulfill the request.
+     */
+    if (len <= rng->dataAvail) {
+        memcpy(output, rng->data + ((sizeof rng->data) - rng->dataAvail), len);
+        memset(rng->data + ((sizeof rng->data) - rng->dataAvail), 0, len);
+        rng->dataAvail -= len;
+        rv = SECSuccess;
+        /* if we are asking for a small number of bytes, cache the rest of
+     * the bytes */
+    } else if (len < sizeof rng->data) {
+        rv = prng_generateNewBytes(rng, rng->data, sizeof rng->data,
+                                   rng->additionalAvail ? rng->additionalDataCache : NULL,
+                                   rng->additionalAvail);
+        rng->additionalAvail = 0;
+        if (rv == SECSuccess) {
+            memcpy(output, rng->data, len);
+            memset(rng->data, 0, len);
+            rng->dataAvail = (sizeof rng->data) - len;
+        }
+        /* we are asking for lots of bytes, just ask the generator to pass them */
+    } else {
+        rv = prng_generateNewBytes(rng, output, len,
+                                   rng->additionalAvail ? rng->additionalDataCache : NULL,
+                                   rng->additionalAvail);
+        rng->additionalAvail = 0;
+    }
+    PZ_Unlock(rng->lock);
+    /* --- UNLOCKED --- */
+    return rv;
+}
+
+/*
+** Generate some random bytes, using the global random number generator
+** object.
+*/
+SECStatus
+RNG_GenerateGlobalRandomBytes(void *dest, size_t len)
+{
+#ifdef UNSAFE_FUZZER_MODE
+    return prng_GenerateDeterministicRandomBytes(globalrng->lock, dest, len);
+#else
+    return prng_GenerateGlobalRandomBytes(globalrng, dest, len);
+#endif
+}
+
+SECStatus
+RNG_ResetForFuzzing(void)
+{
+#ifdef UNSAFE_FUZZER_MODE
+    return prng_ResetForFuzzing(globalrng->lock);
+#else
+    return SECFailure;
+#endif
+}
+
+void
+RNG_RNGShutdown(void)
+{
+    /* check for a valid global RNG context */
+    PORT_Assert(globalrng != NULL);
+    if (globalrng == NULL) {
+        /* Should set a "not initialized" error code. */
+        PORT_SetError(SEC_ERROR_NO_MEMORY);
+        return;
+    }
+    /* clear */
+    prng_freeRNGContext(globalrng);
+    globalrng = NULL;
+    /* reset the callonce struct to allow a new call to RNG_RNGInit() */
+    coRNGInit = pristineCallOnce;
+}
+
+/*
+ * Test case interface. used by fips testing and power on self test
+ */
+/* make sure the test context is separate from the global context, This
+  * allows us to test the internal random number generator without losing
+  * entropy we may have previously collected. */
+RNGContext testContext;
+
+SECStatus
+PRNGTEST_Instantiate_Kat(const PRUint8 *entropy, unsigned int entropy_len,
+                         const PRUint8 *nonce, unsigned int nonce_len,
+                         const PRUint8 *personal_string, unsigned int ps_len)
+{
+    testContext.isKatTest = PR_TRUE;
+    return PRNGTEST_Instantiate(entropy, entropy_len,
+                                nonce, nonce_len,
+                                personal_string, ps_len);
+}
+
+/*
+ * Test vector API. Use NIST SP 800-90 general interface so one of the
+ * other NIST SP 800-90 algorithms may be used in the future.
+ */
+SECStatus
+PRNGTEST_Instantiate(const PRUint8 *entropy, unsigned int entropy_len,
+                     const PRUint8 *nonce, unsigned int nonce_len,
+                     const PRUint8 *personal_string, unsigned int ps_len)
+{
+    int bytes_len = entropy_len + nonce_len + ps_len;
+    PRUint8 *bytes = NULL;
+    SECStatus rv;
+
+    if (entropy_len < 256 / PR_BITS_PER_BYTE) {
+        PORT_SetError(SEC_ERROR_NEED_RANDOM);
+        return SECFailure;
+    }
+
+    bytes = PORT_Alloc(bytes_len);
+    if (bytes == NULL) {
+        PORT_SetError(SEC_ERROR_NO_MEMORY);
+        return SECFailure;
+    }
+    /* concatenate the various inputs, internally NSS only instantiates with
+    * a single long string */
+    PORT_Memcpy(bytes, entropy, entropy_len);
+    if (nonce) {
+        PORT_Memcpy(&bytes[entropy_len], nonce, nonce_len);
+    } else {
+        PORT_Assert(nonce_len == 0);
+    }
+    if (personal_string) {
+        PORT_Memcpy(&bytes[entropy_len + nonce_len], personal_string, ps_len);
+    } else {
+        PORT_Assert(ps_len == 0);
+    }
+    rv = prng_instantiate(&testContext, bytes, bytes_len);
+    PORT_ZFree(bytes, bytes_len);
+    if (rv == SECFailure) {
+        return SECFailure;
+    }
+    testContext.isValid = PR_TRUE;
+    return SECSuccess;
+}
+
+SECStatus
+PRNGTEST_Reseed(const PRUint8 *entropy, unsigned int entropy_len,
+                const PRUint8 *additional, unsigned int additional_len)
+{
+    if (!testContext.isValid) {
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    /* This magic input tells us to set the reseed count to it's max count,
+     * so we can simulate PRNGTEST_Generate reaching max reseed count */
+    if ((entropy == NULL) && (entropy_len == 0) &&
+        (additional == NULL) && (additional_len == 0)) {
+        testContext.reseed_counter[0] = RESEED_VALUE;
+        return SECSuccess;
+    }
+    return prng_reseed(&testContext, entropy, entropy_len, additional,
+                       additional_len);
+}
+
+SECStatus
+PRNGTEST_Generate(PRUint8 *bytes, unsigned int bytes_len,
+                  const PRUint8 *additional, unsigned int additional_len)
+{
+    SECStatus rv;
+    if (!testContext.isValid) {
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    /* replicate reseed test from prng_GenerateGlobalRandomBytes */
+    if (testContext.reseed_counter[0] >= RESEED_VALUE) {
+        rv = prng_reseed(&testContext, NULL, 0, NULL, 0);
+        if (rv != SECSuccess) {
+            return rv;
+        }
+    }
+    return prng_generateNewBytes(&testContext, bytes, bytes_len,
+                                 additional, additional_len);
+}
+
+SECStatus
+PRNGTEST_Uninstantiate()
+{
+    if (!testContext.isValid) {
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    PORT_Memset(&testContext, 0, sizeof testContext);
+    return SECSuccess;
+}
+
+SECStatus
+PRNGTEST_RunHealthTests()
+{
+    static const PRUint8 entropy[] = {
+        0x8e, 0x9c, 0x0d, 0x25, 0x75, 0x22, 0x04, 0xf9,
+        0xc5, 0x79, 0x10, 0x8b, 0x23, 0x79, 0x37, 0x14,
+        0x9f, 0x2c, 0xc7, 0x0b, 0x39, 0xf8, 0xee, 0xef,
+        0x95, 0x0c, 0x97, 0x59, 0xfc, 0x0a, 0x85, 0x41,
+        0x76, 0x9d, 0x6d, 0x67, 0x00, 0x4e, 0x19, 0x12,
+        0x02, 0x16, 0x53, 0xea, 0xf2, 0x73, 0xd7, 0xd6,
+        0x7f, 0x7e, 0xc8, 0xae, 0x9c, 0x09, 0x99, 0x7d,
+        0xbb, 0x9e, 0x48, 0x7f, 0xbb, 0x96, 0x46, 0xb3,
+        0x03, 0x75, 0xf8, 0xc8, 0x69, 0x45, 0x3f, 0x97,
+        0x5e, 0x2e, 0x48, 0xe1, 0x5d, 0x58, 0x97, 0x4c
+    };
+    static const PRUint8 rng_known_result[] = {
+        0x16, 0xe1, 0x8c, 0x57, 0x21, 0xd8, 0xf1, 0x7e,
+        0x5a, 0xa0, 0x16, 0x0b, 0x7e, 0xa6, 0x25, 0xb4,
+        0x24, 0x19, 0xdb, 0x54, 0xfa, 0x35, 0x13, 0x66,
+        0xbb, 0xaa, 0x2a, 0x1b, 0x22, 0x33, 0x2e, 0x4a,
+        0x14, 0x07, 0x9d, 0x52, 0xfc, 0x73, 0x61, 0x48,
+        0xac, 0xc1, 0x22, 0xfc, 0xa4, 0xfc, 0xac, 0xa4,
+        0xdb, 0xda, 0x5b, 0x27, 0x33, 0xc4, 0xb3
+    };
+    static const PRUint8 reseed_entropy[] = {
+        0xc6, 0x0b, 0x0a, 0x30, 0x67, 0x07, 0xf4, 0xe2,
+        0x24, 0xa7, 0x51, 0x6f, 0x5f, 0x85, 0x3e, 0x5d,
+        0x67, 0x97, 0xb8, 0x3b, 0x30, 0x9c, 0x7a, 0xb1,
+        0x52, 0xc6, 0x1b, 0xc9, 0x46, 0xa8, 0x62, 0x79
+    };
+    static const PRUint8 additional_input[] = {
+        0x86, 0x82, 0x28, 0x98, 0xe7, 0xcb, 0x01, 0x14,
+        0xae, 0x87, 0x4b, 0x1d, 0x99, 0x1b, 0xc7, 0x41,
+        0x33, 0xff, 0x33, 0x66, 0x40, 0x95, 0x54, 0xc6,
+        0x67, 0x4d, 0x40, 0x2a, 0x1f, 0xf9, 0xeb, 0x65
+    };
+    static const PRUint8 rng_reseed_result[] = {
+        0x02, 0x0c, 0xc6, 0x17, 0x86, 0x49, 0xba, 0xc4,
+        0x7b, 0x71, 0x35, 0x05, 0xf0, 0xdb, 0x4a, 0xc2,
+        0x2c, 0x38, 0xc1, 0xa4, 0x42, 0xe5, 0x46, 0x4a,
+        0x7d, 0xf0, 0xbe, 0x47, 0x88, 0xb8, 0x0e, 0xc6,
+        0x25, 0x2b, 0x1d, 0x13, 0xef, 0xa6, 0x87, 0x96,
+        0xa3, 0x7d, 0x5b, 0x80, 0xc2, 0x38, 0x76, 0x61,
+        0xc7, 0x80, 0x5d, 0x0f, 0x05, 0x76, 0x85
+    };
+    static const PRUint8 rng_no_reseed_result[] = {
+        0xc4, 0x40, 0x41, 0x8c, 0xbf, 0x2f, 0x70, 0x23,
+        0x88, 0xf2, 0x7b, 0x30, 0xc3, 0xca, 0x1e, 0xf3,
+        0xef, 0x53, 0x81, 0x5d, 0x30, 0xed, 0x4c, 0xf1,
+        0xff, 0x89, 0xa5, 0xee, 0x92, 0xf8, 0xc0, 0x0f,
+        0x88, 0x53, 0xdf, 0xb6, 0x76, 0xf0, 0xaa, 0xd3,
+        0x2e, 0x1d, 0x64, 0x37, 0x3e, 0xe8, 0x4a, 0x02,
+        0xff, 0x0a, 0x7f, 0xe5, 0xe9, 0x2b, 0x6d
+    };
+
+    SECStatus rng_status = SECSuccess;
+    PR_STATIC_ASSERT(sizeof(rng_known_result) >= sizeof(rng_reseed_result));
+    PRUint8 result[sizeof(rng_known_result)];
+
+    /********************************************/
+    /*   First test instantiate error path.     */
+    /*   In this case we supply enough entropy, */
+    /*   but not enough seed. This will trigger */
+    /*   the code that checks for a entropy     */
+    /*   source failure.                        */
+    /********************************************/
+    rng_status = PRNGTEST_Instantiate(entropy, 256 / PR_BITS_PER_BYTE,
+                                      NULL, 0, NULL, 0);
+    if (rng_status == SECSuccess) {
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    if (PORT_GetError() != SEC_ERROR_NEED_RANDOM) {
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    /* we failed with the proper error code, we can continue */
+
+    /********************************************/
+    /* Generate random bytes with a known seed. */
+    /********************************************/
+    rng_status = PRNGTEST_Instantiate(entropy, sizeof entropy,
+                                      NULL, 0, NULL, 0);
+    if (rng_status != SECSuccess) {
+        /* Error set by PRNGTEST_Instantiate */
+        return SECFailure;
+    }
+    rng_status = PRNGTEST_Generate(result, sizeof rng_known_result, NULL, 0);
+    if ((rng_status != SECSuccess) ||
+        (PORT_Memcmp(result, rng_known_result,
+                     sizeof rng_known_result) != 0)) {
+        PRNGTEST_Uninstantiate();
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    rng_status = PRNGTEST_Reseed(reseed_entropy, sizeof reseed_entropy,
+                                 additional_input, sizeof additional_input);
+    if (rng_status != SECSuccess) {
+        /* Error set by PRNG_Reseed */
+        PRNGTEST_Uninstantiate();
+        return SECFailure;
+    }
+    rng_status = PRNGTEST_Generate(result, sizeof rng_reseed_result, NULL, 0);
+    if ((rng_status != SECSuccess) ||
+        (PORT_Memcmp(result, rng_reseed_result,
+                     sizeof rng_reseed_result) != 0)) {
+        PRNGTEST_Uninstantiate();
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    /* This magic forces the reseed count to it's max count, so we can see if
+     * PRNGTEST_Generate will actually when it reaches it's count */
+    rng_status = PRNGTEST_Reseed(NULL, 0, NULL, 0);
+    if (rng_status != SECSuccess) {
+        PRNGTEST_Uninstantiate();
+        /* Error set by PRNG_Reseed */
+        return SECFailure;
+    }
+    /* This generate should now reseed */
+    rng_status = PRNGTEST_Generate(result, sizeof rng_reseed_result, NULL, 0);
+    if ((rng_status != SECSuccess) ||
+        /* NOTE we fail if the result is equal to the no_reseed_result.
+         * no_reseed_result is the value we would have gotten if we didn't
+         * do an automatic reseed in PRNGTEST_Generate */
+        (PORT_Memcmp(result, rng_no_reseed_result,
+                     sizeof rng_no_reseed_result) == 0)) {
+        PRNGTEST_Uninstantiate();
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    /* make sure reseed fails when we don't supply enough entropy */
+    rng_status = PRNGTEST_Reseed(reseed_entropy, 4, NULL, 0);
+    if (rng_status == SECSuccess) {
+        PRNGTEST_Uninstantiate();
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    if (PORT_GetError() != SEC_ERROR_NEED_RANDOM) {
+        PRNGTEST_Uninstantiate();
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    rng_status = PRNGTEST_Uninstantiate();
+    if (rng_status != SECSuccess) {
+        /* Error set by PRNG_Uninstantiate */
+        return rng_status;
+    }
+    /* make sure uninstantiate fails if the contest is not initiated (also tests
+     * if the context was cleared in the previous Uninstantiate) */
+    rng_status = PRNGTEST_Uninstantiate();
+    if (rng_status == SECSuccess) {
+        PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
+        return SECFailure;
+    }
+    if (PORT_GetError() != SEC_ERROR_LIBRARY_FAILURE) {
+        return rng_status;
+    }
+
+    return SECSuccess;
+}