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HMAC_Init int HMAC_Init( [ out ]HMAC_Context* pContext, int nAlgID, [ in, size_is( nKeyLength ) ] const void* pKey, [ in ]int nKeyLength ); Return value Nonzero if initialization is successful, otherwise 0. In particular, this function returns 0 when nAlgID is invalid. Parameters pContext [out] A memory buffer that will be used as a context. Note. All predefined types are specified in the Predefined Types List. nAlgID [in] The ID of the hash algorithm selected for calculations. For example, nAlgID has to be set to SHA1_ALGID when you need to calculate the HMAC using SHA-1 hash algorithm. Note. All supported hash algorithms with their corresponding IDs are specified in the Predefined Constants List. pKey [in] The key which represents a continuous memory block. nKeyLength [in] Length in bytes of the key. Remarks Initializes the context specified by pContext with the key specified by pKey. Note. Before the first call to HMAC_Update, HMAC_UpdateStr, HMAC_Final or HMAC_FinalHex functions, the context must be initialized with HMAC_Init or HMAC_InitKeyStr. VB Example See the example for HMAC_Final. Type Library Overview | Type Library Functions | Useful Links | HashCalc
See Also HMAC_InitKeyStr, HMAC_Final, HMAC_FinalHex, HMAC_Update, HMAC_UpdateStr
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