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I use JcaContentSignerBuilder to sign a self-signed certificate but I don't know what the default padding is. My requirement is that I must NOT use PKCS#1.5 padding. The code I use is below - can someone tell me what padding this is going to generate?

KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA", "BC");

ContentSigner sigGen = new JcaContentSignerBuilder("SHA256WithRSAEncryption").setProvider("BC").build(keyPair.getPrivate());

X509Certificate certificate = new JcaX509CertificateConverter().setProvider("BC").getCertificate(builder.build(sigGen));

Best regards, Gianpaolo

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It seems that SHA256WithRSA "implies the PKCS#1 v1.5 padding algorithm [RFC3447]"

See RFC4051, 2.3.2.

Sources : bouncycastle , crypto.stackexchange

  • Thanks, u r right. Any idea on what algorithms could I use? – Gianpaolo Rossi Oct 29 '15 at 16:17
  • After more research, I found a "SHA256withRSA/PSS", which, as its name says, uses PSS in place of PKCS#1 v1.5. I can't tell you much more about it. Good luck! – zr_ifrit Oct 29 '15 at 16:44

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