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VerifyFileSignature[{"file",sig},key]

verifies the digital signature sig for file using the specified public key.

VerifyFileSignature[{"file",range,sig},key]

verifies the digital signature sig for the specified range of bytes in the file.

VerifyFileSignature[{{"file1",range1,sig1},{"file2",range2,sig2},…},key]

verifies the digital signatures sigi for each of rangei of bytes in the filei, all using the specified public key.

VerifyFileSignature[key]

represents an operator form of VerifyFileSignature that can be applied to files.

Details
Details and Options Details and Options
Examples  
Basic Examples  
Scope  
File Types  
Byte Ranges  
Operator Form  
Multiple Files  
Properties & Relations  
See Also
Related Guides
History
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VerifyFileSignature

VerifyFileSignature[{"file",sig},key]

verifies the digital signature sig for file using the specified public key.

VerifyFileSignature[{"file",range,sig},key]

verifies the digital signature sig for the specified range of bytes in the file.

VerifyFileSignature[{{"file1",range1,sig1},{"file2",range2,sig2},…},key]

verifies the digital signatures sigi for each of rangei of bytes in the filei, all using the specified public key.

VerifyFileSignature[key]

represents an operator form of VerifyFileSignature that can be applied to files.

Details

Examples

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Basic Examples  (2)

Generate an RSA–based key pair:

Wolfram Language code: keys = GenerateAsymmetricKeyPair["RSA"]

Generate a digital signature of the file using your private key:

Wolfram Language code: file = FindFile["ExampleData/document.nb"];
Wolfram Language code: signature = GenerateFileSignature[file, keys["PrivateKey"]]

Verify a digital signature using your public key:

Wolfram Language code: VerifyFileSignature[{file, signature}, keys["PublicKey"]]

Sign a file using a hashing function of your choice:

Wolfram Language code: keys = GenerateAsymmetricKeyPair["EllipticCurve"];
Wolfram Language code: file = FindFile["ExampleData/ocelot.jpg"];
Wolfram Language code: signature = GenerateFileSignature[file, keys["PrivateKey"], Method -> <|"HashingMethod" -> "Keccak512"|>]

Verification will automatically consider the hashing function used for signing:

Wolfram Language code: VerifyFileSignature[{file, signature}, keys["PublicKey"]]

Scope  (5)

File Types  (2)

Digitally sign and verify a signed CloudObject:

Wolfram Language code: object = CloudPut[123, "test"];
Wolfram Language code: keys = GenerateAsymmetricKeyPair["RSA"];
Wolfram Language code: signature = GenerateFileSignature[object, keys["PrivateKey"]]
Wolfram Language code: VerifyFileSignature[{object, signature}, keys["PublicKey"]]

Create and verify a signature of the file specified by a File object:

Wolfram Language code: file = File[FindFile["ExampleData/spikey2.png"]];
Wolfram Language code: keys = GenerateAsymmetricKeyPair["EllipticCurve"];
Wolfram Language code: signature = GenerateFileSignature[file, keys["PrivateKey"]]
Wolfram Language code: VerifyFileSignature[{file, signature}, keys["PublicKey"]]

Byte Ranges  (1)

If the signature was created for a range of bytes in the file, VerifyFileSignature will need the same range specified:

Wolfram Language code: keys = GenerateAsymmetricKeyPair["EllipticCurve"];
Wolfram Language code: file = FindFile["ExampleData/spikey2.png"];

Compute a signature for the first 100 bytes of a file:

Wolfram Language code: signature = GenerateFileSignature[{file, 100}, keys["PrivateKey"]]

Verify the signature for the same range of bytes:

Wolfram Language code: VerifyFileSignature[{file, 100, signature}, keys["PublicKey"]]

The signature will not be valid for a different range of bytes or the whole file:

Wolfram Language code: VerifyFileSignature[{file, 300, signature}, keys["PublicKey"]]
Wolfram Language code: VerifyFileSignature[{file, signature}, keys["PublicKey"]]

Operator Form  (1)

Generate an elliptic curve–based key pair:

Wolfram Language code: keys = GenerateAsymmetricKeyPair["EllipticCurve"];

Apply the operator form of GenerateDigitalSignature to a file:

Wolfram Language code: file = FindFile["ExampleData/glasses.png"];
Wolfram Language code: signature = GenerateFileSignature[keys["PrivateKey"]][file]

Verify a digital signature using your public key:

Wolfram Language code: VerifyFileSignature[keys["PublicKey"]][{file, signature}]

Multiple Files  (1)

Sign several files with the same set of keys:

Wolfram Language code: keys = GenerateAsymmetricKeyPair["EllipticCurve"];
Wolfram Language code: files = {FindFile["ExampleData/ocelot.jpg"], FindFile["ExampleData/glasses.png"]};
Wolfram Language code: signatures = GenerateFileSignature[keys["PrivateKey"]][files]

Verify their signatures:

Wolfram Language code: VerifyFileSignature[keys["PublicKey"]][Transpose[{files, signatures}]]

Properties & Relations  (1)

Uploading a file to the Wolfram Cloud keeps the contents of the file intact. When verifying the digital signatures of the original file and the cloud copy, they are both valid:

Wolfram Language code: keys = GenerateAsymmetricKeyPair["EllipticCurve"];

Copy a file to the cloud:

Wolfram Language code: file = FindFile["ExampleData/document.nb"];
Wolfram Language code: cloud = CopyFile[file, CloudObject["document-copy.nb"]];

Create the signature for both the local and cloud copies of the file:

Wolfram Language code: {sig1, sig2} = GenerateFileSignature[keys["PrivateKey"]][{file, cloud}]

All possible combinations of files and signatures are valid:

Wolfram Language code: VerifyFileSignature[keys["PublicKey"]][ Tuples[{{file, cloud}, {sig1, sig2}}]]
Wolfram Research (2020), VerifyFileSignature, Wolfram Language function, https://reference.wolfram.com/language/ref/VerifyFileSignature.html.

Text

Wolfram Research (2020), VerifyFileSignature, Wolfram Language function, https://reference.wolfram.com/language/ref/VerifyFileSignature.html.

CMS

Wolfram Language. 2020. "VerifyFileSignature." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/VerifyFileSignature.html.

APA

Wolfram Language. (2020). VerifyFileSignature. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/VerifyFileSignature.html

BibTeX

@misc{reference.wolfram_2026_verifyfilesignature, author="Wolfram Research", title="{VerifyFileSignature}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/VerifyFileSignature.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_verifyfilesignature, organization={Wolfram Research}, title={VerifyFileSignature}, year={2020}, url={https://reference.wolfram.com/language/ref/VerifyFileSignature.html}, note=[Accessed: 13-June-2026]}