diff --git a/ipmi.cpp b/ipmi.cpp
index 00f027a..50208d3 100644
--- a/ipmi.cpp
+++ b/ipmi.cpp
@@ -26,6 +26,7 @@
         {FlashSubCmds::flashStartTransfer, sizeof(struct StartTx)},
         {FlashSubCmds::flashDataBlock, sizeof(struct ChunkHdr) + 1},
         {FlashSubCmds::flashStartHash, sizeof(struct StartTx)},
+        {FlashSubCmds::flashHashData, sizeof(struct ChunkHdr) + 1},
     };
 
     auto results = minimumLengths.find(command);
@@ -66,10 +67,10 @@
     struct ChunkHdr hdr;
     std::memcpy(&hdr, reqBuf, sizeof(hdr));
 
-    size_t requestLength = (*dataLen);
+    auto requestLength = *dataLen;
 
     /* Grab the bytes from the packet. */
-    size_t bytesLength = requestLength - sizeof(struct ChunkHdr);
+    auto bytesLength = requestLength - sizeof(struct ChunkHdr);
     std::vector<uint8_t> bytes(bytesLength);
     std::memcpy(bytes.data(), &reqBuf[sizeof(struct ChunkHdr)], bytesLength);
 
@@ -115,3 +116,29 @@
     (*dataLen) = 1;
     return IPMI_CC_OK;
 }
+
+ipmi_ret_t hashBlock(UpdateInterface* updater, const uint8_t* reqBuf,
+                     uint8_t* replyBuf, size_t* dataLen)
+{
+    struct ChunkHdr hdr;
+    std::memcpy(&hdr, reqBuf, sizeof(hdr));
+
+    auto requestLength = *dataLen;
+
+    /* Grab the bytes from the packet. */
+    auto bytesLength = requestLength - sizeof(struct ChunkHdr);
+    std::vector<uint8_t> bytes(bytesLength);
+    std::memcpy(bytes.data(), &reqBuf[sizeof(struct ChunkHdr)], bytesLength);
+
+    /* TODO: Refactor this and dataBlock for re-use. */
+
+    if (!updater->hashData(hdr.offset, bytes))
+    {
+        return IPMI_CC_INVALID;
+    }
+
+    /* We were successful and set the response byte to 0. */
+    replyBuf[0] = 0x00;
+    (*dataLen) = 1;
+    return IPMI_CC_OK;
+}