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b3a68ed095
DirtySDK (EA's Dirty Sockets library) will be used for the LiveAPI implementation, and depends on: EABase, EAThread.
92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/*H********************************************************************************/
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/*!
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\File cryptmont.h
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\Description
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This module implements the math for elliptic curve cryptography
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using montgomery curves
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\Copyright
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Copyright (c) Electronic Arts 2018. ALL RIGHTS RESERVED.
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*/
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/********************************************************************************H*/
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#ifndef _cryptmont_h
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#define _cryptmont_h
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/*!
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\Moduledef CryptMont CryptMont
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\Modulemember Crypt
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*/
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//@{
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#include "DirtySDK/platform.h"
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#include "DirtySDK/crypt/cryptbn.h"
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#include "DirtySDK/crypt/cryptdef.h"
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/*** Type Definitions **************************************************************/
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typedef struct CryptMontT
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{
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CryptBnT Prime; //!< curve prime
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CryptBnT PrimeMin2; //!< curve prime - 2 used for exponentiation
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CryptBnT BasePoint; //!< curve base point (only u)
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CryptBnT A24; //!< constant used for calculations
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CryptBnT PrivateKey; //!< private key
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//! working state
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CryptBnT X_2;
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CryptBnT X_3;
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CryptEccPointT Result; //!< cached result and z_2/z_3 during the point state
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int32_t iMemGroup; //!< memgroup id
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void *pMemGroupUserdata; //!< memgroup userdata
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CryptBnT *pTable; //!< table used for sliding window in exponentiation
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enum
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{
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CRYPTMONT_COMPUTE_POINT,//!< calculate the point
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CRYPTMONT_COMPUTE_EXP //!< calculate the final result
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} eState; //!< current state of the calculation
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int16_t iBitIndex; //!< bit index for the calculation (private key or exponent)
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uint8_t bAccumulOne; //!< used to skip the first multiply
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uint8_t uSwap; //!< current swap state
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uint32_t uCryptUsecs; //!< total number of usecs the operation took
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int32_t iCurveType; //!< what curve were we initialized with
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} CryptMontT;
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/*** Functions ********************************************************************/
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#ifdef __cplusplus
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extern "C" {
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#endif
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// init the curve state
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DIRTYCODE_API int32_t CryptMontInit(CryptMontT *pState, int32_t iCurveType);
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// for testing-purposes; set the private key
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DIRTYCODE_API void CryptMontSetPrivateKey(CryptMontT *pState, const uint8_t *pKey);
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// generates a public key based on the curve parameters: BasePoint * Secret
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DIRTYCODE_API int32_t CryptMontPublic(CryptMontT *pState, CryptEccPointT *pResult, uint32_t *pCryptUsecs);
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// generate a shared secret based on the curve parameters and other parties public key: PublicKey * Secret
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DIRTYCODE_API int32_t CryptMontSecret(CryptMontT *pState, CryptEccPointT *pPublicKey, CryptEccPointT *pResult, uint32_t *pCryptUsecs);
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// initialize a point on the curve from a buffer
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DIRTYCODE_API int32_t CryptMontPointInitFrom(CryptEccPointT *pPoint, const uint8_t *pBuffer, int32_t iBufSize);
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// output a point to a buffer
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DIRTYCODE_API int32_t CryptMontPointFinal(const CryptMontT *pState, const CryptEccPointT *pPoint, uint8_t bSecret, uint8_t *pBuffer, int32_t iBufSize);
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#ifdef __cplusplus
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}
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#endif
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//@}
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#endif // _cryptmont_h
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