| /********************************************************************************/ |
| /* */ |
| /* GetRandom */ |
| /* Written by Ken Goldman */ |
| /* IBM Thomas J. Watson Research Center */ |
| /* */ |
| /* (c) Copyright IBM Corporation 2015 - 2019. */ |
| /* */ |
| /* All rights reserved. */ |
| /* */ |
| /* Redistribution and use in source and binary forms, with or without */ |
| /* modification, are permitted provided that the following conditions are */ |
| /* met: */ |
| /* */ |
| /* Redistributions of source code must retain the above copyright notice, */ |
| /* this list of conditions and the following disclaimer. */ |
| /* */ |
| /* Redistributions in binary form must reproduce the above copyright */ |
| /* notice, this list of conditions and the following disclaimer in the */ |
| /* documentation and/or other materials provided with the distribution. */ |
| /* */ |
| /* Neither the names of the IBM Corporation nor the names of its */ |
| /* contributors may be used to endorse or promote products derived from */ |
| /* this software without specific prior written permission. */ |
| /* */ |
| /* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */ |
| /* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */ |
| /* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR */ |
| /* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */ |
| /* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */ |
| /* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */ |
| /* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, */ |
| /* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY */ |
| /* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */ |
| /* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE */ |
| /* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ |
| /********************************************************************************/ |
| |
| /* |
| |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <stdint.h> |
| |
| #include <ibmtss/tss.h> |
| #include <ibmtss/tssutils.h> |
| #include <ibmtss/tssresponsecode.h> |
| #include <ibmtss/Unmarshal_fp.h> |
| |
| static void printUsage(void); |
| |
| extern int tssUtilsVerbose; |
| |
| int main(int argc, char *argv[]) |
| { |
| TPM_RC rc = 0; |
| int i; /* argc iterator */ |
| TSS_CONTEXT *tssContext = NULL; |
| GetRandom_In in; |
| GetRandom_Out out; |
| uint32_t bytesRequested = 0; |
| uint32_t bytesCopied; |
| const char *outFilename = NULL; |
| unsigned char *randomBuffer = NULL; |
| int noZeros = FALSE; |
| int noSpace = FALSE; |
| TPMI_SH_AUTH_SESSION sessionHandle0 = TPM_RH_NULL; |
| unsigned int sessionAttributes0 = 0; |
| TPMI_SH_AUTH_SESSION sessionHandle1 = TPM_RH_NULL; |
| unsigned int sessionAttributes1 = 0; |
| TPMI_SH_AUTH_SESSION sessionHandle2 = TPM_RH_NULL; |
| unsigned int sessionAttributes2 = 0; |
| |
| setvbuf(stdout, 0, _IONBF, 0); /* output may be going through pipe to log file */ |
| TSS_SetProperty(NULL, TPM_TRACE_LEVEL, "1"); |
| tssUtilsVerbose = FALSE; |
| |
| /* command line argument defaults */ |
| for (i=1 ; (i<argc) && (rc == 0) ; i++) { |
| if (strcmp(argv[i],"-by") == 0) { |
| i++; |
| if (i < argc) { |
| sscanf(argv[i],"%u", &bytesRequested); |
| } |
| else { |
| printf("Missing parameter for -by\n"); |
| printUsage(); |
| } |
| } |
| else if (strcmp(argv[i],"-of") == 0) { |
| i++; |
| if (i < argc) { |
| outFilename = argv[i]; |
| } |
| else { |
| printf("-of option needs a value\n"); |
| printUsage(); |
| } |
| } |
| else if (strcmp(argv[i],"-nz") == 0) { |
| noZeros = TRUE; |
| } |
| else if (strcmp(argv[i],"-ns") == 0) { |
| noSpace = TRUE; |
| } |
| else if (strcmp(argv[i],"-se0") == 0) { |
| i++; |
| if (i < argc) { |
| sscanf(argv[i],"%x", &sessionHandle0); |
| } |
| else { |
| printf("Missing parameter for -se0\n"); |
| printUsage(); |
| } |
| i++; |
| if (i < argc) { |
| sscanf(argv[i],"%x", &sessionAttributes0); |
| if (sessionAttributes0 > 0xff) { |
| printf("Out of range session attributes for -se0\n"); |
| printUsage(); |
| } |
| } |
| else { |
| printf("Missing parameter for -se0\n"); |
| printUsage(); |
| } |
| } |
| else if (strcmp(argv[i],"-se1") == 0) { |
| i++; |
| if (i < argc) { |
| sscanf(argv[i],"%x", &sessionHandle1); |
| } |
| else { |
| printf("Missing parameter for -se1\n"); |
| printUsage(); |
| } |
| i++; |
| if (i < argc) { |
| sscanf(argv[i],"%x", &sessionAttributes1); |
| if (sessionAttributes1 > 0xff) { |
| printf("Out of range session attributes for -se1\n"); |
| printUsage(); |
| } |
| } |
| else { |
| printf("Missing parameter for -se1\n"); |
| printUsage(); |
| } |
| } |
| else if (strcmp(argv[i],"-se2") == 0) { |
| i++; |
| if (i < argc) { |
| sscanf(argv[i],"%x", &sessionHandle2); |
| } |
| else { |
| printf("Missing parameter for -se2\n"); |
| printUsage(); |
| } |
| i++; |
| if (i < argc) { |
| sscanf(argv[i],"%x", &sessionAttributes2); |
| if (sessionAttributes2 > 0xff) { |
| printf("Out of range session attributes for -se2\n"); |
| printUsage(); |
| } |
| } |
| else { |
| printf("Missing parameter for -se2\n"); |
| printUsage(); |
| } |
| } |
| else if (strcmp(argv[i],"-h") == 0) { |
| printUsage(); |
| } |
| else if (strcmp(argv[i],"-v") == 0) { |
| tssUtilsVerbose = TRUE; |
| TSS_SetProperty(NULL, TPM_TRACE_LEVEL, "2"); |
| } |
| else { |
| printf("\n%s is not a valid option\n", argv[i]); |
| printUsage(); |
| } |
| } |
| if ((bytesRequested == 0) || |
| (bytesRequested > 0xffff)) { |
| printf("Missing or bad parameter -by\n"); |
| printUsage(); |
| } |
| /* allocate a buffer for the bytes requested, add 1 for optional nul terminator */ |
| if (rc == 0) { |
| rc = TSS_Malloc(&randomBuffer, bytesRequested + 1); /* freed @1 */ |
| } |
| /* Start a TSS context */ |
| if (rc == 0) { |
| rc = TSS_Create(&tssContext); |
| } |
| /* This is somewhat optimized, but if a zero byte is obtained in the last pass, an extra pass is |
| needed. The trade-off is that, in general, asking for more random numbers than needed may slow |
| down the TPM. In any case, needing non-zero values for random auth should not happen very |
| often. |
| */ |
| for (bytesCopied = 0 ; (rc == 0) && (bytesCopied < bytesRequested) ; ) { |
| /* Request whatever is left */ |
| if (rc == 0) { |
| in.bytesRequested = bytesRequested - bytesCopied; |
| } |
| /* call TSS to execute the command */ |
| if (rc == 0) { |
| rc = TSS_Execute(tssContext, |
| (RESPONSE_PARAMETERS *)&out, |
| (COMMAND_PARAMETERS *)&in, |
| NULL, |
| TPM_CC_GetRandom, |
| sessionHandle0, NULL, sessionAttributes0, |
| sessionHandle1, NULL, sessionAttributes1, |
| sessionHandle2, NULL, sessionAttributes2, |
| TPM_RH_NULL, NULL, 0); |
| } |
| if (rc == 0) { |
| size_t br; |
| if (tssUtilsVerbose) TSS_PrintAll("randomBytes in pass", |
| out.randomBytes.t.buffer, out.randomBytes.t.size); |
| /* copy as many bytes as were received or until bytes requested */ |
| for (br = 0 ; (br < out.randomBytes.t.size) && (bytesCopied < bytesRequested) ; br++) { |
| |
| if (!noZeros || (out.randomBytes.t.buffer[br] != 0)) { |
| randomBuffer[bytesCopied] = out.randomBytes.t.buffer[br]; |
| bytesCopied++; |
| } |
| } |
| } |
| if (rc == 0) { |
| if (noZeros) { |
| randomBuffer[bytesCopied] = 0x00; |
| } |
| } |
| } |
| { |
| TPM_RC rc1 = TSS_Delete(tssContext); |
| if (rc == 0) { |
| rc = rc1; |
| } |
| } |
| if ((rc == 0) && (outFilename != NULL)) { |
| rc = TSS_File_WriteBinaryFile(randomBuffer, bytesRequested + (noZeros ? 1 : 0), |
| outFilename); |
| } |
| if (rc == 0) { |
| /* machine readable format */ |
| if (noSpace) { |
| uint32_t bp; |
| for (bp = 0 ; bp < bytesRequested ; bp++) { |
| printf("%02x", randomBuffer[bp]); |
| } |
| printf("\n"); |
| } |
| /* human readable format */ |
| else { |
| TSS_PrintAll("randomBytes", randomBuffer, bytesRequested); |
| } |
| } |
| else { |
| const char *msg; |
| const char *submsg; |
| const char *num; |
| printf("getrandom: failed, rc %08x\n", rc); |
| TSS_ResponseCode_toString(&msg, &submsg, &num, rc); |
| printf("%s%s%s\n", msg, submsg, num); |
| rc = EXIT_FAILURE; |
| } |
| free(randomBuffer); /* @1 */ |
| return rc; |
| } |
| |
| static void printUsage(void) |
| { |
| printf("\n"); |
| printf("getrandom\n"); |
| printf("\n"); |
| printf("Runs TPM2_GetRandom\n"); |
| printf("\n"); |
| printf("\t-by\tbytes requested\n"); |
| printf("\t[-of\toutput file, with -nz, appends nul terminator (default do not save)]\n"); |
| printf("\t[-nz\tget random number with no zero bytes (for authorization value)]\n"); |
| printf("\t[-ns\tno space, no text, no newlines]\n"); |
| printf("\t\tjust a string of hexascii suitable for a symmetric key\n"); |
| printf("\n"); |
| printf("\t-se[0-2] session handle / attributes (default NULL)\n"); |
| printf("\t01\tcontinue\n"); |
| printf("\t40\tresponse encrypt\n"); |
| exit(1); |
| } |