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  • Committer: Bazaar Package Importer
  • Author(s): Daniel Baumann
  • Date: 2008-01-23 22:03:00 UTC
  • mfrom: (1.1.1 upstream)
  • Revision ID: james.westby@ubuntu.com-20080123220300-fhtqja3c0oq0gp6z
Tags: 0.3.1-4
http://bugs.debian.org/457400
http://bugs.debian.org/459682
* Added patch from Aaron M. Ucko <ucko@debian.org> to allow trousers to
  build successfully on amd64, and presumably also other 64-bit
  architectures (Closes: #457400).
* Including udev rule for /dev/tpm from William Lima
  <wlima.amadeus@gmail.com> as suggested by David Smith <dds@google.com>
  (Closes: #459682).
* Added lintian overrides.

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src/tcs/tcsi_random.c
 
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/*
 
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 * Licensed Materials - Property of IBM
 
4
 *
 
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 * trousers - An open source TCG Software Stack
 
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 *
 
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 * (C) Copyright International Business Machines Corp. 2004
 
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 *
 
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 */
 
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11
 
 
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#include <stdlib.h>
 
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#include <stdio.h>
 
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#include <string.h>
 
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#include <inttypes.h>
 
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#include "trousers/tss.h"
 
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#include "trousers_types.h"
 
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#include "tcs_tsp.h"
 
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#include "tcsps.h"
 
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#include "tcs_utils.h"
 
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#include "tcs_int_literals.h"
 
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#include "capabilities.h"
 
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#include "tcslog.h"
 
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#include "req_mgr.h"
 
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#include "tcsd_wrap.h"
 
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#include "tcsd.h"
 
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/*
 
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 * Get a random number generated by the TPM.  Most (all?) TPMs return a maximum number of random
 
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 * bytes that's less than the max allowed to be returned at the TSP level, which is 4K bytes.
 
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 * According to the TPM compliance work posted here: http://www.prosec.rub.de/tpmcompliance.html,
 
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 * some TPMs return as little as 132 bytes per query, which would require about 30 loops to get 4K.
 
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 * We'll be extremely conservative here and loop 50 times, since it won't affect performance on
 
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 * TPMs that return more bytes.
 
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 */
 
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TSS_RESULT
 
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TCSP_GetRandom_Internal(TCS_CONTEXT_HANDLE hContext,    /* in */
 
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                        UINT32 * bytesRequested,        /* in, out */
 
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                        BYTE ** randomBytes)    /* out */
 
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{
 
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        UINT64 offset = 0;
 
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        TSS_RESULT result;
 
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        UINT32 paramSize, totalReturned = 0, bytesReturned, retries = 50;
 
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        BYTE txBlob[TSS_TPM_TXBLOB_SIZE], *rnd_tmp = NULL;
 
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        LogDebugFn("%u bytes", *bytesRequested);
 
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        if ((result = ctx_verify_context(hContext)))
 
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                return result;
 
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        do {
 
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                if ((result = tpm_rqu_build(TPM_ORD_GetRandom, &offset, txBlob,
 
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                                            *bytesRequested - totalReturned, NULL)))
 
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                        break;
 
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                if ((result = req_mgr_submit_req(txBlob)))
 
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                        break;;
 
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                result = UnloadBlob_Header(txBlob, &paramSize);
 
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                if (!result) {
 
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#if 0
 
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                        offset = 10;
 
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                        UnloadBlob_UINT32(&offset, &bytesReturned, txBlob);
 
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                        LogDebugFn("received %u bytes from the TPM", bytesReturned);
 
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                        rnd_tmp = realloc(rnd_tmp, totalReturned + bytesReturned);
 
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                        if (rnd_tmp == NULL) {
 
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                                LogError("malloc of %u bytes failed.", bytesReturned);
 
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                                return TCSERR(TSS_E_OUTOFMEMORY);
 
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                        }
 
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                        UnloadBlob(&offset, bytesReturned, txBlob, &rnd_tmp[totalReturned]);
 
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#else
 
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                        /* XXX */
 
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                        if ((result = tpm_rsp_parse(TPM_ORD_GetRandom, txBlob, paramSize,
 
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                                                    &bytesReturned, &rnd_tmp, NULL, NULL)))
 
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                                break;
 
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                        *randomBytes = realloc(*randomBytes, totalReturned + bytesReturned);
 
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                        if (*randomBytes == NULL) {
 
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                                free(rnd_tmp);
 
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                                rnd_tmp = NULL;
 
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                                LogError("malloc of %u bytes failed.", bytesReturned);
 
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                                result = TCSERR(TSS_E_OUTOFMEMORY);
 
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                                break;
 
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                        }
 
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                        memcpy(*randomBytes, rnd_tmp, bytesReturned);
 
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                        free(rnd_tmp);
 
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                        rnd_tmp = NULL;
 
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#endif
 
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                        totalReturned += bytesReturned;
 
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                } else {
 
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                        free(rnd_tmp);
 
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                        return result;
 
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                }
 
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        } while (totalReturned < *bytesRequested && retries--);
 
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        if (totalReturned != *bytesRequested) {
 
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                LogDebugFn("Only %u random bytes recieved from TPM.", totalReturned);
 
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                free(rnd_tmp);
 
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                result = TCSERR(TSS_E_FAIL);
 
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#if 0
 
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        } else
 
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                *randomBytes = rnd_tmp;
 
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#else
 
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        }
 
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#endif
 
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        return result;
 
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}
 
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TSS_RESULT
 
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TCSP_StirRandom_Internal(TCS_CONTEXT_HANDLE hContext,   /* in */
 
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                         UINT32 inDataSize,     /* in */
 
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                         BYTE * inData) /* in */
 
118
{
 
119
        UINT64 offset = 0;
 
120
        UINT32 paramSize;
 
121
        TSS_RESULT result;
 
122
        BYTE txBlob[TSS_TPM_TXBLOB_SIZE];
 
123
 
 
124
        LogDebug("Entering stir random");
 
125
 
 
126
        if (inDataSize > 255) {
 
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                LogDebugFn("inData is too large! (%u bytes)", inDataSize);
 
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                return TCSERR(TSS_E_BAD_PARAMETER);
 
129
        }
 
130
 
 
131
        if ((result = ctx_verify_context(hContext)))
 
132
                return result;
 
133
 
 
134
        if ((result = tpm_rqu_build(TPM_ORD_StirRandom, &offset, txBlob, inDataSize, inDataSize,
 
135
                                    inData, NULL, NULL)))
 
136
                return result;
 
137
 
 
138
        if ((result = req_mgr_submit_req(txBlob)))
 
139
                return result;
 
140
 
 
141
        result = UnloadBlob_Header(txBlob, &paramSize);
 
142
        LogResult("Stir random", result);
 
143
        return result;
 
144
}
 
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