TPMCmd/tpm/src/command/DA/DictionaryAttackParameters.c

/* Microsoft Reference Implementation for TPM 2.0
 *
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 *  are permitted provided that the following conditions are met:
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 *  of conditions and the following disclaimer.
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#include "Tpm.h"
#include "DictionaryAttackParameters_fp.h"

#ifdef TPM_CC_DictionaryAttackParameters  // Conditional expansion of this file

/*(See part 3 specification)
// change the lockout parameters
*/
TPM_RC
TPM2_DictionaryAttackParameters(
    DictionaryAttackParameters_In   *in             // IN: input parameter list
    )
{
    // The command needs NV update.
    RETURN_IF_NV_IS_NOT_AVAILABLE;

// Internal Data Update

    // Set dictionary attack parameters
    gp.maxTries = in->newMaxTries;
    gp.recoveryTime = in->newRecoveryTime;
    gp.lockoutRecovery = in->lockoutRecovery;

#if 0   // Errata eliminates this code
    // This functionality has been disabled. The preferred implementation is now
    // to leave failedTries unchanged when the parameters are changed. This could
    // have the effect of putting the TPM into DA lockout if in->newMaxTries is
    // not greater than the current value of gp.failedTries.
    // Set failed tries to 0
    gp.failedTries = 0;
#endif

    // Record the changes to NV
    NV_SYNC_PERSISTENT(failedTries);
    NV_SYNC_PERSISTENT(maxTries);
    NV_SYNC_PERSISTENT(recoveryTime);
    NV_SYNC_PERSISTENT(lockoutRecovery);

    return TPM_RC_SUCCESS;
}

#endif // CC_DictionaryAttackParameters