diff --git a/ipmi.cpp b/ipmi.cpp
index d8e9f89..00f027a 100644
--- a/ipmi.cpp
+++ b/ipmi.cpp
@@ -25,6 +25,7 @@
     static const std::unordered_map<FlashSubCmds, size_t> minimumLengths = {
         {FlashSubCmds::flashStartTransfer, sizeof(struct StartTx)},
         {FlashSubCmds::flashDataBlock, sizeof(struct ChunkHdr) + 1},
+        {FlashSubCmds::flashStartHash, sizeof(struct StartTx)},
     };
 
     auto results = minimumLengths.find(command);
@@ -98,3 +99,19 @@
     (*dataLen) = 1;
     return IPMI_CC_OK;
 }
+
+ipmi_ret_t startHash(UpdateInterface* updater, const uint8_t* reqBuf,
+                     uint8_t* replyBuf, size_t* dataLen)
+{
+    auto request = reinterpret_cast<const struct StartTx*>(reqBuf);
+
+    if (!updater->startHash(request->length))
+    {
+        return IPMI_CC_INVALID;
+    }
+
+    /* We were successful and set the response byte to 0. */
+    replyBuf[0] = 0x00;
+    (*dataLen) = 1;
+    return IPMI_CC_OK;
+}