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/usr/include/wolfssl/openssl/crypto.h is in libwolfssl-dev 3.13.0+dfsg-1.

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/* crypto.h for openSSL */

#ifndef WOLFSSL_CRYPTO_H_
#define WOLFSSL_CRYPTO_H_

#include <wolfssl/openssl/opensslv.h>

#include <wolfssl/wolfcrypt/settings.h>

#ifdef WOLFSSL_PREFIX
#include "prefix_crypto.h"
#endif


WOLFSSL_API const char*   wolfSSLeay_version(int type);
WOLFSSL_API unsigned long wolfSSLeay(void);

#define CRYPTO_THREADID void

#define SSLeay_version wolfSSLeay_version
#define SSLeay wolfSSLeay


#define SSLEAY_VERSION 0x0090600fL
#define SSLEAY_VERSION_NUMBER SSLEAY_VERSION

#if defined(HAVE_STUNNEL) || defined(WOLFSSL_NGINX) || defined(WOLFSSL_HAPROXY)
#define CRYPTO_set_mem_ex_functions      wolfSSL_CRYPTO_set_mem_ex_functions
#define FIPS_mode                        wolfSSL_FIPS_mode
#define FIPS_mode_set                    wolfSSL_FIPS_mode_set
typedef struct CRYPTO_EX_DATA            CRYPTO_EX_DATA;
typedef void (CRYPTO_free_func)(void*parent, void*ptr, CRYPTO_EX_DATA *ad, int idx,
        long argl, void* argp);
#define CRYPTO_THREADID_set_callback wolfSSL_THREADID_set_callback
#define CRYPTO_THREADID_set_numeric wolfSSL_THREADID_set_numeric

#define CRYPTO_lock wc_LockMutex
#define CRYPTO_r_lock wc_LockMutex
#define CRYPTO_unlock wc_UnLockMutex

#define CRYPTO_THREAD_lock wc_LockMutex
#define CRYPTO_THREAD_r_lock wc_LockMutex
#define CRYPTO_THREAD_unlock wc_UnLockMutex

#define OPENSSL_malloc(a)  XMALLOC(a, NULL, DYNAMIC_TYPE_OPENSSL)

#endif /* HAVE_STUNNEL || WOLFSSL_NGINX || WOLFSSL_HAPROXY */

#endif /* header */