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72 lines
1.7 KiB
C++
72 lines
1.7 KiB
C++
#ifndef libhis_getrandombytes_hpp
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#define libhis_getrandombytes_hpp
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#ifdef WINDOWS
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#include "tspi.h"
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#include "tss_error.h"
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#include "tss_defines.h"
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#endif
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#ifdef LINUX
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#include <tss/tspi.h>
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#include <tss/tss_error.h>
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#include <tss/tss_defines.h>
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#endif
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#include "libhis_exception.hpp"
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class libhis_getrandombytes
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{
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public:
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libhis_getrandombytes()
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{
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//create a context object
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result = Tspi_Context_Create(&hcontext);
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if(result != TSS_SUCCESS) throw libhis_exception("Create Conntext", result);
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}
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void getrandombytes(
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unsigned long bytes_size,
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unsigned char *&output_value)
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{
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//establish a session
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result = Tspi_Context_Connect(hcontext, 0);
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if(result != TSS_SUCCESS) throw libhis_exception("Connect Context", result);
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//get the TPM object
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result = Tspi_Context_GetTpmObject(hcontext, &htpm);
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if(result != TSS_SUCCESS) throw libhis_exception("Get TPM Object", result);
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//get random bytes
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BYTE *bytes_value;
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result = Tspi_TPM_GetRandom(htpm, bytes_size, &bytes_value);
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if(result != TSS_SUCCESS) throw libhis_exception("Get Random Bytes", result);
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//copy C-style output into C++ format
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output_value = new unsigned char[bytes_size];
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for(unsigned long i = 0; i < bytes_size; i++)
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{
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output_value[i] = bytes_value[i];
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}
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//clean up random bytes
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result = Tspi_Context_FreeMemory(hcontext, bytes_value);
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if(result != TSS_SUCCESS) throw libhis_exception("Cleanup bytes", result);
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return;
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}
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~libhis_getrandombytes()
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{
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//close context
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result = Tspi_Context_Close(hcontext);
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if(result != TSS_SUCCESS) throw libhis_exception("Close Context", result);
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}
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private:
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TSS_RESULT result;
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TSS_HCONTEXT hcontext;
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TSS_HTPM htpm;
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};
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#endif
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