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https://issues.apache.org/jira/browse/PDFBOX-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17921408#comment-17921408
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Michael Klink commented on PDFBOX-5940:
---------------------------------------
{quote}how would be know the correct algorithm{quote}
Well, usually there strictly speaking is not _*the* correct algorithm_. E.g. if
you have a RSA key, you may either sign using the old RSASSA-PKCS1-v1_5
(SHAxxxwithRSA) or the slightly newer RSASSA-PSS (SHAxxxwithMGF1andRSA); if you
have an EC key, you may either use DER (SHAxxxwithECDSA) or PLAIN
(SHAxxxwithPLAIN-ECDSA).
Concerning the digest algorithm, there often are multiple option. Usually one
chooses a digest algorithm with comparable strength, so it depends on the key
length or curve. E.g. SHA256withRSA/2048, SHA512withRSA/4096, SHA256withECDSA
on brainpoolP256r1 or secp256r1, SHA512withECDSA on brainpoolkP512r1 or
secp521r1.
> InvalidKeyException: Supplied key (sun.security.ec.ECPrivateKeyImpl) is not a
> RSAPrivateKey
> -------------------------------------------------------------------------------------------
>
> Key: PDFBOX-5940
> URL: https://issues.apache.org/jira/browse/PDFBOX-5940
> Project: PDFBox
> Issue Type: Bug
> Components: Crypto, Signing
> Affects Versions: 2.0.33, 3.0.4 PDFBox, 4.0.0
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Priority: Trivial
> Fix For: 2.0.34, 3.0.5 PDFBox, 4.0.0
>
>
> InvalidKeyException: Supplied key (sun.security.ec.ECPrivateKeyImpl) is not a
> RSAPrivateKey instance
> at
> org.bouncycastle.jcajce.provider.asymmetric.rsa.DigestSignatureSpi.engineInitSign(Unknown
> Source)
> at
> java.base/java.security.Signature$Delegate.tryOperation(Signature.java:1321)
> at
> java.base/java.security.Signature$Delegate.chooseProvider(Signature.java:1275)
> at
> java.base/java.security.Signature$Delegate.engineInitSign(Signature.java:1359)
> at java.base/java.security.Signature.initSign(Signature.java:635)
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