The JC 3.0.4 API defines new getInstance() form for Signature, Cipher and few others.
I would like to use this Signature.getInstance(byte,byte,byte,boolean) to instantiate this kind of combination:
Signature.getInstance(MessageDigest.ALG_SHA_256, Signature.SIG_CIPHER_RSA, Cipher.PAD_PKCS1, false);
Signature.getInstance(MessageDigest.ALG_NULL, Signature.SIG_CIPHER_RSA, Cipher.PAD_PKCS1, false);
then using sig.signPreComputedHash(...) method to do signing.
The first form works, but puts ASN.1 DER wrapper with OID of SHA-256 around the supplied data.
I would like to use the second form supplying pre-wrapped data on a material using one of myriad digest algorithms that Java Card does not support.
Essentially I want to do with Signature API what I can do with Cipher API:
Cipher c = Cipher.getInstance(Cipger.ALG_RSA_PKCS1, false);
short len = c.doFinal(buffer, offset, length, buffer, offset);
The public specifications (JC 3.0.4/3.0.5) are not telling what parameter combinations should be supported in this Signature mode.
Can anybody identify which public document describes these modes in JC 3.0.4 ?