98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
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/////////////////////////////////////////////////////////////////////////////
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// FILE : csp.c //
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// DESCRIPTION : Crypto API interface //
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// Global Stuff for CSP
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// AUTHOR : Amit Kapoor //
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/////////////////////////////////////////////////////////////////////////////
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#undef UNICODE
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#include <windows.h>
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#include <fxupbn.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Needed for DLL
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BOOLEAN DllInitialize (IN PVOID hmod,IN ULONG Reason,IN PCONTEXT Context)
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{
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LoadLibrary("offload.dll");
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return( TRUE );
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}
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BOOL WINAPI OffloadModExpo(
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IN BYTE *pbBase,
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IN BYTE *pbExpo,
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IN DWORD cbExpo,
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IN BYTE *pbMod,
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IN DWORD cbMod,
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IN BYTE *pbResult,
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IN void *pReserved,
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IN DWORD dwFlags
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)
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{
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mp_modulus_t *pModularMod = NULL;
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digit_t *pbModularBase = NULL;
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digit_t *pbModularResult = NULL;
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DWORD dwModularLen = (cbMod + (RADIX_BYTES - 1)) / RADIX_BYTES; // dwLen is length in bytes
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BYTE *pbTmpExpo = NULL;
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BOOL fAlloc = FALSE;
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BOOL fRet = FALSE;
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if (cbExpo < cbMod)
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{
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if (NULL == (pbTmpExpo = (BYTE*)LocalAlloc(LMEM_ZEROINIT, dwModularLen * RADIX_BYTES)))
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{
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SetLastError(ERROR_NOT_ENOUGH_MEMORY);
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goto Ret;
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}
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fAlloc = TRUE;
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memcpy(pbTmpExpo, pbExpo, cbExpo);
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}
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else
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{
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pbTmpExpo = pbExpo;
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}
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if (NULL == (pModularMod = (mp_modulus_t*)LocalAlloc(LMEM_ZEROINIT,
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sizeof(mp_modulus_t))))
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{
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goto Ret;
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}
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if (NULL == (pbModularBase = (digit_t*)LocalAlloc(LMEM_ZEROINIT,
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MP_LONGEST * sizeof(digit_t))))
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{
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goto Ret;
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}
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if (NULL == (pbModularResult = (digit_t*)LocalAlloc(LMEM_ZEROINIT,
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MP_LONGEST * sizeof(digit_t))))
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{
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goto Ret;
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}
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// change values into modular form
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create_modulus((digit_tc*)pbMod, dwModularLen, FROM_RIGHT, pModularMod);
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to_modular((digit_tc*)pbBase, dwModularLen, pbModularBase, pModularMod);
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mod_exp(pbModularBase, (digit_tc*)pbTmpExpo, dwModularLen,
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pbModularResult, pModularMod);
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from_modular(pbModularResult, (digit_t*)pbResult, pModularMod);
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fRet = TRUE;
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Ret:
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if (pModularMod)
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LocalFree(pModularMod);
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if (pbModularBase)
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LocalFree(pbModularBase);
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if (pbModularResult)
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LocalFree(pbModularResult);
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if (fAlloc && pbTmpExpo)
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LocalFree(pbTmpExpo);
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return fRet;
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}
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#ifdef __cplusplus
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}
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#endif
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