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For the allocation, a bigNum structure is created // as is a local BIGNUM. The bigNum is initialized and then the BIGNUM is // set to reference the local value. #define BIG_VAR(name, bits) \ BN_VAR(name##Bn, (bits)); \ BIGNUM _##name; \ BIGNUM* name = BigInitialized( \ , BnInit(name##Bn, BYTES_TO_CRYPT_WORDS(sizeof(_##name##Bn.d)))) // Allocate a BIGNUM and initialize with the values in a bigNum initializer #define BIG_INITIALIZED(name, initializer) \ BIGNUM _##name; \ BIGNUM* name = BigInitialized(&_##name, initializer) typedef struct { const TPMBN_ECC_CURVE_CONSTANTS* C; // the TPM curve values EC_GROUP* G; // group parameters BN_CTX* CTX; // the context for the math (this might not be // the context in which the curve was created>; } OSSL_CURVE_DATA; // Define the curve data type expected by the TpmBigNum library: typedef OSSL_CURVE_DATA bigCurveData; TPM_INLINE const TPMBN_ECC_CURVE_CONSTANTS* AccessCurveConstants( const bigCurveData* E) { return E->C; } #include "TpmToOsslSupport_fp.h" // Start and end a context within which the OpenSSL memory management works #define OSSL_ENTER() BN_CTX* CTX = OsslContextEnter() #define OSSL_LEAVE() OsslContextLeave(CTX) // Start and end a local stack frame within the context of the curve frame #define ECC_ENTER() BN_CTX* CTX = OsslPushContext(E->CTX) #define ECC_LEAVE() OsslPopContext(CTX) #define BN_NEW() BnNewVariable(CTX) // This definition would change if there were something to report #define MathLibSimulationEnd() #endif // _BN_TO_OSSL_MATH_H_