Add support for using external signing application and .pem private key files to vbutil_keyblock.

tests/run_vbutil_tests.sh

Index: tests/run_vbutil_tests.sh
diff --git a/tests/run_vbutil_tests.sh b/tests/run_vbutil_tests.sh
index b8811305717caaf0fb42400770f7880e1e62f8f7..b56f4c1259bcec35b9f66a150758c55dd03aa7ee 100755
--- a/tests/run_vbutil_tests.sh
+++ b/tests/run_vbutil_tests.sh
@@ -124,6 +124,46 @@ ${datahashalgo}${COL_STOP}"
             exit 1
           fi
 
+          echo -e "${COL_YELLOW}Testing keyblock creation using \
+external signer.${COL_STOP}"
+          # Pack using external signer
+          # Pack
+          ${UTIL_DIR}/vbutil_keyblock --pack ${keyblockfile} \
+            --datapubkey \
+              ${TESTKEY_SCRATCH_DIR}/key_alg${data_algorithmcounter}.vbpubk \
+            --signprivate_pem \
+              ${TESTKEY_DIR}/key_rsa${signing_keylen}.pem \
+            --pem_algorithm "${signing_algorithmcounter}" \
+            --externalsigner "${SCRIPT_DIR}/external_rsa_signer.sh"
+
+          if [ $? -ne 0 ]
+          then
+            echo -e "${COL_RED}Pack${COL_STOP}"
+            return_code=255
+          fi
+
+          # Unpack
+          ${UTIL_DIR}/vbutil_keyblock --unpack ${keyblockfile} \
+            --datapubkey \
+            ${TESTKEY_SCRATCH_DIR}/key_alg${data_algorithmcounter}.vbpubk2 \
+            --signpubkey \
+            ${TESTKEY_SCRATCH_DIR}/key_alg${signing_algorithmcounter}.vbpubk
+          if [ $? -ne 0 ]
+          then
+            echo -e "${COL_RED}Unpack${COL_STOP}"
+            return_code=255
+          fi
+
+          # Check
+          if ! cmp -s \
+            ${TESTKEY_SCRATCH_DIR}/key_alg${data_algorithmcounter}.vbpubk \
+            ${TESTKEY_SCRATCH_DIR}/key_alg${data_algorithmcounter}.vbpubk2
+          then
+            echo -e "${COL_RED}Check${COL_STOP}"
+            return_code=255
+            exit 1
+          fi
+
           let data_algorithmcounter=data_algorithmcounter+1
         done
       done