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/* ====================================================================
 * Copyright (c) 2003 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.
 *
 */

#ifndef HEADER_FIPS_RAND_H
# define HEADER_FIPS_RAND_H

# include <openssl/aes.h>
# include <openssl/evp.h>
# include <openssl/hmac.h>
# include <openssl/rand.h>

# ifdef OPENSSL_FIPS

#  ifdef  __cplusplus
extern "C" {
#  endif

/*
 * IMPORTANT NOTE:
 * All functions in this header file are deprecated and should not be used
 * as they use the old FIPS_drbg implementation that is not FIPS validated
 * anymore.
 * To provide backwards compatibility for applications that need FIPS compliant
 * RNG number generation and use FIPS_drbg_generate, this function was
 * re-wired to call the FIPS validated DRBG instance instead through
 * the RAND_bytes() call.
 *
 * All these functions will be removed in future.
 */

    typedef struct drbg_ctx_st DRBG_CTX;
/* DRBG external flags */
/* Flag for CTR mode only: use derivation function ctr_df */
#  define DRBG_FLAG_CTR_USE_DF            0x1
/* PRNG is in test state */
#  define DRBG_FLAG_TEST                  0x2

    DRBG_CTX *FIPS_drbg_new(int type, unsigned int flags);
    int FIPS_drbg_init(DRBG_CTX *dctx, int type, unsigned int flags);
    int FIPS_drbg_instantiate(DRBG_CTX *dctx,
                              const unsigned char *pers, size_t perslen);
    int FIPS_drbg_reseed(DRBG_CTX *dctx, const unsigned char *adin,
                         size_t adinlen);
    int FIPS_drbg_generate(DRBG_CTX *dctx, unsigned char *out, size_t outlen,
                           int prediction_resistance,
                           const unsigned char *adin, size_t adinlen);

    int FIPS_drbg_uninstantiate(DRBG_CTX *dctx);
    void FIPS_drbg_free(DRBG_CTX *dctx);

    int FIPS_drbg_set_callbacks(DRBG_CTX *dctx,
                                size_t (*get_entropy) (DRBG_CTX *ctx,
                                                       unsigned char **pout,
                                                       int entropy,
                                                       size_t min_len,
                                                       size_t max_len),
                                void (*cleanup_entropy) (DRBG_CTX *ctx,
                                                         unsigned char *out,
                                                         size_t olen),
                                size_t entropy_blocklen,
                                size_t (*get_nonce) (DRBG_CTX *ctx,
                                                     unsigned char **pout,
                                                     int entropy,
                                                     size_t min_len,
                                                     size_t max_len),
                                void (*cleanup_nonce) (DRBG_CTX *ctx,
                                                       unsigned char *out,
                                                       size_t olen));

    int FIPS_drbg_set_rand_callbacks(DRBG_CTX *dctx,
                                     size_t (*get_adin) (DRBG_CTX *ctx,
                                                         unsigned char
                                                         **pout),
                                     void (*cleanup_adin) (DRBG_CTX *ctx,
                                                           unsigned char *out,
                                                           size_t olen),
                                     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));

    void *FIPS_drbg_get_app_data(DRBG_CTX *ctx);
    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);
    void FIPS_drbg_set_check_interval(DRBG_CTX *dctx, int interval);
    void FIPS_drbg_set_reseed_interval(DRBG_CTX *dctx, int interval);

    int FIPS_drbg_health_check(DRBG_CTX *dctx);

    DRBG_CTX *FIPS_get_default_drbg(void);
    const RAND_METHOD *FIPS_drbg_method(void);

    int FIPS_rand_set_method(const RAND_METHOD *meth);
    const RAND_METHOD *FIPS_rand_get_method(void);

    void FIPS_rand_set_bits(int nbits);

    int FIPS_rand_strength(void);

/* 1.0.0 compat functions */
    int FIPS_rand_seed(const void *buf, int num);
    int FIPS_rand_bytes(unsigned char *out, int outlen);
    void FIPS_rand_reset(void);
    int FIPS_rand_status(void);
#  ifdef  __cplusplus
}
#  endif
# endif
#endif
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