Can I sign all files using digital signature or is there any file type that I cannot sign?
I can get public key of my certificate but how can I sign .iso or .zip files with that ?
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Can I sign all files using digital signature or is there any file type that I cannot sign?
I can get public key of my certificate but how can I sign .iso or .zip files with that ?
The answer depends on format you wish to sign in. PKCS#7 / CMS / CAdES signing is a binary format that lets you sign any data and make both wrapping and detached signatures. XMLDSIG / XAdES (XML signing) can be used for the same purpose as well. There exist also format-specific signature mechanisms (eg. for signing Office documents, PDF documents etc).
For signing you must have a certificate with a corresponding private key. It’s a private key that enables signing.
In Java you can do signing using BouncyCastle or our SecureBlackbox (Java edition). BouncyCastle supports PKCS7 / CMS signing, our SecureBlackbox supports all signature formats and mechanisms I mentioned above.