![]() It would be possible to create a correctly formatted input for rsautl, but it would be awkward and involve dealing with ASN.1 details. Obviously this doesn’t match what openssl dgst -verify is expecting, so the verification fails. These two things together mean that the data you are using looks like this: Secondly, rsautl is fairly “low level”, and when signing doesn’t add the metadata that openssl dgst -verify is expecting, although it does add the padding. However this is not what you create in your steps.įirst of all the default output of openssl dgst is the hex encoding of the resulting hash, not the raw bytes. This format is what openssl dgst -verify is looking for when you try to verify the signature. (The metadata specifies which hash function has been used.) Please correct me if I went wrong somewhere.Īccording to PKCS1.5, when signing the format of the data that goes into the RSA operation looks something like this: Verify the file (example.txt)and the digital signature (example.sha256) openssl dgst -sha256 -verify public.pem -signature example.sha256 example.txtĪfter doing all this, I get an error message saying " Verification Failure" Sign the hash using Private key to a file called example.sha256 openssl rsautl -sign -inkey private.pem -keyform PEM -in hash > example.sha256ĥ. openssl rsa -in private.pem -out public.pem -outform PEM -puboutģ. Please also explain why digital signatures are useful in general.ġ.Create private/public key pair openssl genrsa -out private.pem 1024Ģ. Describe what you observed and explain your observations. Please describe how you performed the above three operations (e.g., the exact commands that you used, etc.). Slightly modify example.txt, and verify the digital signature again.Verify the digital signature in example.sha256.Sign the SHA256 hash of example.txt save the output in example.sha256.Also prepare an RSA public/private key pair. ![]() Please prepare a file (example.txt) of any size. In this task, we will use OpenSSL to generate digital signatures. ![]()
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