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b3a68ed095
DirtySDK (EA's Dirty Sockets library) will be used for the LiveAPI implementation, and depends on: EABase, EAThread.
82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
/*H********************************************************************************/
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/*!
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\File cryptgcm.h
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\Description
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An implementation of the GCM-128 and GCM-256 cipher, based on the NIST
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standard, intended for use in implementation of TLS1.1 GCM cipher suites.
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This implementation uses Shoup's method utilizing 4-bit tables as described
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in the GCM specifications. While not particularly fast, table generation
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is quick and memory usage required small. This implementation is restricted
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to a feature set suitable for implementation of TLS1.1 GCM cipher suites.
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\Copyright
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Copyright (c) 2014 Electronic Arts
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\Version 07/01/2014 (jbrookes) First Version
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*/
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/********************************************************************************H*/
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#ifndef _cryptgcm_h
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#define _cryptgcm_h
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/*!
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\Moduledef CryptGcm CryptGcm
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\Modulemember Crypt
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*/
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//@{
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/*** Include files ****************************************************************/
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#include "DirtySDK/platform.h"
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#include "DirtySDK/crypt/cryptaes.h"
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/*** Defines **********************************************************************/
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/*** Macros ***********************************************************************/
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/*** Type Definitions *************************************************************/
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// opaque module state
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typedef struct CryptGcmT CryptGcmT;
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//! all fields are PRIVATE
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struct CryptGcmT
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{
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uint64_t HL[16]; //!< precalculated htable, low
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uint64_t HH[16]; //!< precalculated htable, high
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uint64_t uLen; //!< data length
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uint64_t uAddLen; //!< additional data length
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uint8_t aBaseEctr[16]; //!< first ECTR for tag
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uint8_t aY[16]; //!< y scratch buffer
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uint8_t aBuf[16]; //!< I/O scratch buffer
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uint32_t uMode; //!< CRYPTAES_KETYPE_ENCRYPT or CRYPTAES_KEYTYPE_DECRYPT
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CryptAesKeyScheduleT KeySchedule; //!< AES key schedule
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};
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/*** Variables ********************************************************************/
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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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// initialize state for GCM encryption/decryption module
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DIRTYCODE_API void CryptGcmInit(CryptGcmT *pGcm, const uint8_t *pKeyBuf, int32_t iKeyLen);
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// encrypt data with the GCM cipher
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DIRTYCODE_API int32_t CryptGcmEncrypt(CryptGcmT *pGcm, uint8_t *pBuffer, int32_t iLength, const uint8_t *pInitVec, int32_t iIvLen, const uint8_t *pAddData, int32_t iAddLen, uint8_t *pTag, int32_t iTagLen);
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// decrypt data with the GCM cipher
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DIRTYCODE_API int32_t CryptGcmDecrypt(CryptGcmT *pGcm, uint8_t *pBuffer, int32_t iLength, const uint8_t *pInitVec, int32_t iIvLen, const uint8_t *pAddData, int32_t iAddLen, uint8_t *pTag, int32_t iTagLen);
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#ifdef __cplusplus
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}
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#endif
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//@}
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#endif // _cryptgcm_h
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