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The Java™ Tutorials
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Generating and Verifying Signatures
Generating a Digital Signature
Prepare Initial Program Structure
Generate Public and Private Keys
Sign the Data
Save the Signature and the Public Key in Files
Compile and Run the Program
Verifying a Digital Signature
Prepare Initial Program Structure
Input and Convert the Encoded Public Key Bytes
Input the Signature Bytes
Verify the Signature
Compile and Run the Program
Weaknesses and Alternatives
Trail: Security Features in Java SE
Lesson: Generating and Verifying Signatures
Section: Verifying a Digital Signature
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Input the Signature Bytes

Next, input the signature bytes from the file specified as the second command line argument.

FileInputStream sigfis = new FileInputStream(args[1]);
byte[] sigToVerify = new byte[sigfis.available()]; 
sigfis.read(sigToVerify);
sigfis.close();

Now the byte array sigToVerify contains the signature bytes.

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