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diff --git a/roms/skiboot/libstb/tss2/ibmtpm20tss/utils/hmacstart.c b/roms/skiboot/libstb/tss2/ibmtpm20tss/utils/hmacstart.c
new file mode 100644
index 000000000..3fdd0f9fa
--- /dev/null
+++ b/roms/skiboot/libstb/tss2/ibmtpm20tss/utils/hmacstart.c
@@ -0,0 +1,278 @@
+/********************************************************************************/
+/* */
+/* HmacStart */
+/* 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>
+
+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;
+ HMAC_Start_In in;
+ HMAC_Start_Out out;
+ TPMI_DH_OBJECT keyHandle = 0;
+ const char *keyPassword = NULL;
+ const char *authPassword = NULL;
+ TPMI_ALG_HASH halg = TPM_ALG_SHA256;
+ TPMI_SH_AUTH_SESSION sessionHandle0 = TPM_RS_PW;
+ 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;
+
+ for (i=1 ; (i<argc) && (rc == 0) ; i++) {
+ if (strcmp(argv[i],"-hk") == 0) {
+ i++;
+ if (i < argc) {
+ sscanf(argv[i],"%x",&keyHandle);
+ }
+ else {
+ printf("Missing parameter for -hk\n");
+ printUsage();
+ }
+ }
+ else if (strcmp(argv[i],"-pwdk") == 0) {
+ i++;
+ if (i < argc) {
+ keyPassword = argv[i];
+ }
+ else {
+ printf("-pwdk option needs a value\n");
+ printUsage();
+ }
+ }
+ else if (strcmp(argv[i],"-pwda") == 0) {
+ i++;
+ if (i < argc) {
+ authPassword = argv[i];
+ }
+ else {
+ printf("-pwda option needs a value\n");
+ printUsage();
+ }
+ }
+ else if (strcmp(argv[i],"-halg") == 0) {
+ i++;
+ if (i < argc) {
+ if (strcmp(argv[i],"sha1") == 0) {
+ halg = TPM_ALG_SHA1;
+ }
+ else if (strcmp(argv[i],"sha256") == 0) {
+ halg = TPM_ALG_SHA256;
+ }
+ else if (strcmp(argv[i],"sha384") == 0) {
+ halg = TPM_ALG_SHA384;
+ }
+ else if (strcmp(argv[i],"sha512") == 0) {
+ halg = TPM_ALG_SHA512;
+ }
+ else {
+ printf("Bad parameter %s for -halg\n", argv[i]);
+ printUsage();
+ }
+ }
+ else {
+ printf("-halg option needs a value\n");
+ printUsage();
+ }
+ }
+ 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 (keyHandle == 0) {
+ printf("Missing handle parameter -hk\n");
+ printUsage();
+ }
+ if (rc == 0) {
+ /* Handle of key that will perform hmac */
+ in.handle = keyHandle;
+ /* auth value for sequence */
+ rc = TSS_TPM2B_StringCopy(&in.auth.b, authPassword, sizeof(in.auth.t.buffer));
+ }
+ if (rc == 0) {
+ in.hashAlg = halg;
+ }
+ /* Start a TSS context */
+ if (rc == 0) {
+ rc = TSS_Create(&tssContext);
+ }
+ /* call TSS to execute the command */
+ if (rc == 0) {
+ rc = TSS_Execute(tssContext,
+ (RESPONSE_PARAMETERS *)&out,
+ (COMMAND_PARAMETERS *)&in,
+ NULL,
+ TPM_CC_HMAC_Start,
+ sessionHandle0, keyPassword, sessionAttributes0,
+ sessionHandle1, NULL, sessionAttributes1,
+ sessionHandle2, NULL, sessionAttributes2,
+ TPM_RH_NULL, NULL, 0);
+ }
+ {
+ TPM_RC rc1 = TSS_Delete(tssContext);
+ if (rc == 0) {
+ rc = rc1;
+ }
+ }
+ if (rc == 0) {
+ printf("hmacstart: handle %08x\n", out.sequenceHandle);
+ if (tssUtilsVerbose) printf("hmacstart: success\n");
+ }
+ else {
+ const char *msg;
+ const char *submsg;
+ const char *num;
+ printf("hmacstart: failed, rc %08x\n", rc);
+ TSS_ResponseCode_toString(&msg, &submsg, &num, rc);
+ printf("%s%s%s\n", msg, submsg, num);
+ rc = EXIT_FAILURE;
+ }
+ return rc;
+}
+
+static void printUsage(void)
+{
+ printf("\n");
+ printf("hmacstart\n");
+ printf("\n");
+ printf("Runs TPM2_Hmac_Start\n");
+ printf("\n");
+ printf("\t-hk\tkey handle\n");
+ printf("\t-pwdk\tpassword for key (default empty)\n");
+ printf("\t-pwda\tpassword for sequence (default empty)\n");
+ printf("\t[-halg\t(sha1, sha256, sha384, sha512) (default sha256)]\n");
+ printf("\n");
+ printf("\t-se[0-2] session handle / attributes (default PWAP)\n");
+ printf("\t01\tcontinue\n");
+ exit(1);
+}