Automatically Verify File Integrity Using Hash Values

Getting Started#

Basic Concept#

Compare hash values before and after transfer to verify that the destination file matches the source

After transferring a file to another server or storage system, a completed transfer status alone may not be enough to confirm that the file contents were preserved correctly.

For example, even if a large dataset, backup file, or critical result file appears on the target system after transfer, you may still need to verify that the source and destination contents are identical and that the file was not changed or corrupted during transfer.

A hash value is calculated from file contents. The same file produces the same hash when calculated using the same method, so comparing the source and destination hash values can verify whether the two files are identical.

If hashes are calculated separately on the source and destination after every transfer, however, the transfer and verification jobs must be run separately, and each file may require its own verification result when multiple files are involved.

With INNORIX Flow, you can connect integrity verification to the transfer result and build an automated verification flow that calculates and compares hash values for the source and destination files.

Instead of checking only whether the file reached the Target, you can verify integrity through a complete flow of source file review → hash calculation → file transfer → destination file review → hash calculation → comparison result.

Original File
      │
      ▼
Hash Calculation
    SHA-256
      │
      ▼
 Original Hash
      │
      │ File Transfer
      ▼
Destination File
      │
      ▼
Hash Calculation
    SHA-256
      │
      ▼
Destination Hash
      │
      ▼
 Hash Comparison
      │
 ┌────┴─────┐
 ▼          ▼
Match    Mismatch
 │          │
 ▼          ▼
Verified    Review

Rather than treating hash verification as a separate manual check, you can configure it to continue automatically from the transfer result and verify integrity for each file.

This also applies to transfers with multiple files, allowing you to review each verification result and distinguish files that match successfully from files that require additional review.

This connects the full integrity-check process from file transfer → destination file review → hash calculation → source comparison → verification result within one Flow.

Verification Flow#

Continue automatically from transfer completion to integrity verification

Hash verification can be configured to check the file once before transfer and again after transfer.

Use the source-file hash as the reference value and compare it with the hash of the transferred destination file.

Source File
   │
   ▼
Generate Reference Hash
   │
   ▼
File Transfer
   │
   ▼
Destination File Applied
   │
   ▼
Generate Destination Hash
   │
   ▼
Compare Source ↔ Destination
   │
 ┌─┴────────────┐
 │              │
 ▼              ▼
Verification Complete       Mismatch Detected
                │
                ▼
             Review Cause

This flow verifies not only whether the transfer completed, but also whether the actual file contents are identical.

Application Scope#

Apply verification only where needed based on file importance and characteristics

Not every file requires the same level of verification.

For large datasets, database backups, media masters, deployment files, and other files where corruption could affect downstream work, hash verification can be connected to the transfer job.

Transfer Targets
    │
    ├── Standard Work Files
    │       └── Review Transfer Result
    │
    ├── DB Backup
    │       └── Transfer + Hash Verification
    │
    ├── Deployment Files
    │       └── Transfer + Hash Verification
    │
    └── Large Source Files
            └── Transfer + Hash Verification

For example, hash verification can be used in the following environments.

IT Engineers#

Verification Criteria#

Configure the hash method and verification scope based on file characteristics

First, define which files should be verified and how their hash values will be compared.

Depending on the transfer environment, you can verify every file or only files matching specific paths, extensions, or size thresholds.

For example, you can define the verification scope as follows.

Source Path
/data/backup
       │
       ▼
File Filter
*.sql
*.dump
*.tar
       │
       ▼
Hash Verification
       │
       ├── SHA-256
       │
       └── Selected Files

The verification criteria can include the following settings.

This makes integrity verification part of the transfer criteria for selected files rather than a separate task from standard file transfer.

Create Baseline#

Record the source-file hash as the verification baseline

When verification starts, first calculate the hash of the source file.

This value becomes the reference used to compare the destination file.

Source

/backup
   │
   ├── db_01.dump
   │       │
   │       ▼
   │   SHA-256
   │       │
   │       ▼
   │   8F3A...C21
   │
   └── db_02.dump
           │
           ▼
       SHA-256
           │
           ▼
       A71D...E09

When multiple files are transferred together, a separate baseline can be generated for each file and compared with its destination copy.

This lets you distinguish cases where the overall transfer completed but an individual file still requires review.

Connect Verification#

Connect file transfer completion and hash comparison in one Flow

After the source hash is ready, run the file transfer and continue with verification after the destination file is applied.

Hash verification can be configured as an independent check or as a follow-up stage that runs automatically after transfer completion.

┌───────────────┐
│ Source File   │
└───────┬───────┘
        │
        ▼
┌───────────────┐
│ Generate Hash │
└───────┬───────┘
        │
        ▼
┌───────────────┐
│ File Transfer │
└───────┬───────┘
        │
        ▼
┌───────────────┐
│ Target File   │
└───────┬───────┘
        │
        ▼
┌───────────────┐
│ Verify Hash   │
└───────────────┘

This structure can be used for the following scenarios.

• Verify remote backup integrity after file transfer

• Check integrity on each target after distributing deployment files to multiple servers

• Compare checksums per file after large-data transfer completes

• Confirm source and stored files are identical before long-term retention

Compare Results#

Review per-file hash values and the overall verification result together

After transfer and verification complete, review the overall execution result in Runs.

Verification should not be shown only as a transfer success result. Review it based on the per-file hash comparison result as well.

Verification Run

┌──────────────────────────────────┐
│ File             Verification    │
├──────────────────────────────────┤
│ db_01.dump       ✓ Match        │
│ db_02.dump       ✓ Match        │
│ archive_01.tar   ✓ Match        │
│ backup_03.dump   ! Mismatch     │
└──────────────────────────────────┘

Verification results can be categorized as follows.

This distinguishes a completed transfer from a transfer whose file verification is still pending.

Mismatch Response#

Review only files with mismatched hashes and rerun the required work

If the source and destination hash values differ, review the transfer status and the Source and Target environments for that file.

When only some files are affected, review the cause and rerun only the required work for failed verification files instead of rerunning the entire job.

Hash Mismatch
      │
      ▼
Review Per-File Results
      │
      ├── Source File
      │
      ├── Target File
      │
      ├── Transfer Result
      │
      └── Hash Value
              │
              ▼
        Review Cause
              │
              ▼
            Retry
              │
              ▼
         Hash Recheck
              │
         ┌────┴────┐
         ▼         ▼
       Match    Mismatch
         │
         ▼
     Verified

When a mismatch occurs, review the following items.

With this recipe, you can automate the entire flow from source file review → hash generation → file transfer → destination file review → checksum comparison → per-file verification result recording → mismatch review.

This verifies not only that the file reached the destination system, but also that it arrived in the same state as the source.