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Tony Northrup Many years ago, I was a developer creating a database that indexed thousands of files for one of the first major Internet download services. A single file was often submitted using multiple file names, so avoiding duplicate files required more than simply checking to see whether the file name already existed. Initially, I sorted through the files to verify that each was unique by examining the size and contents of the files. However, this was an extremely slow process. I decided to create an index of files by using an MD5 hash of each file. Then my application could check whether a file already existed simply by looking up the
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MD5 hash. I was surprised when my application found a duplicate file. After checking into it further, I discovered that it had found two unique files that produced the same hash! This was supposed to be mathematically impossible; however, because the size of the MD5 was a reasonably small 128 bits and the size of the files was much larger, the possibility existed that multiple files would produce the same hash. In my case, I had stumbled across such an unlikely occurrence. Using a longer hash, such as SHA512, further reduces the likelihood of such an occurrence.
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How to Compute a Nonkeyed Hash
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To compute a nonkeyed hash, perform the following steps in your code: 1. Create the hash algorithm object. 2. Store the data to be hashed in a byte array. 3. Call the HashAlgorithm.ComputeHash method. 4. Retrieve the HashAlgorithm.Hash byte array, which contains the hash value. The following console application demonstrates how to create a hash by calculating the hash of the file specified in args[0], and displaying the hash using Base64 text encoding:
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' VB Sub Main(ByVal args As String()) ' Step 1: Create the hash algorithm object Dim myHash As MD5 = New MD5CryptoServiceProvider ' Step 2: Store the data to be hashed in a byte array Dim file As FileStream = New FileStream (args(0), _ FileMode.Open, FileAccess.Read) Dim reader As BinaryReader = New BinaryReader (file) ' Step 3: Call the HashAlgorithm.ComputeHash method myHash.ComputeHash(reader.ReadBytes(CType(file.Length, Integer))) ' Step 4: Retrieve the HashAlgorithm.Hash byte array Console.WriteLine(Convert.ToBase64String(myHash.Hash)) End Sub // C# // Step 1: Create the hash algorithm object MD5 myHash = new MD5CryptoServiceProvider();
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// Step 2: Store the data to be hashed in a byte array FileStream file = new FileStream(args[0], FileMode.Open, FileAccess.Read); BinaryReader reader = new BinaryReader(file); // Step 3: Call the HashAlgorithm.ComputeHash method myHash.ComputeHash(reader.ReadBytes((int)file.Length)); // Step 4: Retrieve the HashAlgorithm.Hash byte array Console.WriteLine(Convert.ToBase64String(myHash.Hash));
Repeatedly running that console application to calculate the hash of a single file will always produce the same hash result until the file is modified. After the file is modified, the hash result also changes. Consider the following console output, which creates a new text file, computes the hash repeatedly, and then modifies the file. After the file is modified, the hash also changes:
C:\>echo Hello, World! > HashThis.txt C:\>HashExample HashThis.txt h7GTmgvuZdN0SGR0A6qdBA== C:\>HashExample HashThis.txt h7GTmgvuZdN0SGR0A6qdBA== C:\>echo Hello, again. >> HashThis.txt C:\>HashExample HashThis.txt F1QQWOeK/Yc2EwNR2BxCuw==
Because all nonkeyed hash algorithms are derived from a single class, you can change the hash algorithm used simply by changing the algorithm declaration. The more bits used in the hash, the longer the hash that will be displayed. To later verify that the data has not been modified, simply recalculate the hash using the same algorithm and compare the two values.
How to Compute a Keyed Hash
To compute a keyed hash, perform the following steps in your code: 1. Create a secret key that is shared among all parties who will compute or verify the hash. 2. Create the hash algorithm object using the secret key. If you do not provide a secret key, one will be automatically generated for you. 3. Store the data to be hashed in a byte array. 4. Call the KeyedHashAlgorithm.ComputeHash method.
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