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     40 
     41 /*
     42 //
     43 //  Purpose:
     44 //     Cryptography Primitive.
     45 //     PRNG Functions
     46 //
     47 //  Contents:
     48 //     HW random generator
     49 //
     50 //
     51 */
     52 
     53 #include "owndefs.h"
     54 
     55 #include "owncp.h"
     56 #include "pcpbn.h"
     57 #include "pcptool.h"
     58 
     59 #if !defined (_PCP_PRN_GEN_HW_H)
     60 #define _PCP_PRN_GEN_HW_H
     61 
     62 #if ((_IPP>=_IPP_G9) || (_IPP32E>=_IPP32E_E9))
     63 __INLINE int cpRand_hw_sample(BNU_CHUNK_T* pSample)
     64 {
     65 #define LOCAL_COUNTER (8)
     66    int n;
     67    int success = 0;
     68    for(n=0; n<LOCAL_COUNTER && !success; n++)
     69       #if (_IPP_ARCH == _IPP_ARCH_IA32)
     70       success = _rdrand32_step(pSample);
     71       #elif (_IPP_ARCH == _IPP_ARCH_EM64T)
     72       success = _rdrand64_step(pSample);
     73       #else
     74       #error Unknown CPU arch
     75       #endif
     76    return success;
     77 #undef LOCAL_COUNTER
     78 }
     79 
     80 #if (_IPP32E>=_IPP32E_E9)
     81 __INLINE int cpRand_hw_sample32(Ipp32u* pSample)
     82 {
     83 #define LOCAL_COUNTER (8)
     84    int n;
     85    int success = 0;
     86    for(n=0; n<LOCAL_COUNTER && !success; n++)
     87       success = _rdrand32_step(pSample);
     88    return success;
     89 #undef LOCAL_COUNTER
     90 }
     91 #endif
     92 
     93 /*F*
     94 // Name: cpRandHW_buffer
     95 //
     96 // Purpose: Generates a pseudorandom bit sequence
     97 //          based on RDRAND instruction of the specified nBits length.
     98 //
     99 // Returns:                   Reason:
    100 //    1                        no errors
    101 //    0                        random bit sequence can't be generated
    102 //
    103 // Parameters:
    104 //    pBuffer  pointer to the buffer
    105 //    bufLen    buffer length
    106 *F*/
    107 
    108 __INLINE int cpRandHW_buffer(Ipp32u* pBuffer, int bufLen)
    109 {
    110    int nSamples = bufLen/(sizeof(BNU_CHUNK_T)/sizeof(Ipp32u));
    111 
    112    int n;
    113    /* collect nSamples randoms */
    114    for(n=0; n<nSamples; n++, pBuffer+=(sizeof(BNU_CHUNK_T)/sizeof(Ipp32u))) {
    115       if( !cpRand_hw_sample((BNU_CHUNK_T*)pBuffer))
    116          return 0;
    117    }
    118 
    119    #if (_IPP32E>=_IPP32E_E9)
    120    if( bufLen%(sizeof(BNU_CHUNK_T)/sizeof(Ipp32u)) ) {
    121       if( !cpRand_hw_sample32(pBuffer)) {
    122          return 0;
    123       }
    124    }
    125    #endif
    126    return 1;
    127 }
    128 #endif
    129 
    130 #endif /* #if !defined (_PCP_PRN_GEN_HW_H) */
    131