Hi all,
I've a problem and i think it's related with the external digest array size. I
have had this code working until today:
tSignatureAppearance.setExternalDigest(new byte[128], new byte[20], "RSA");
I've just tested this with a new certificate (from a new CA, which i think
generates bigger keys (4 Kb?)) and it doesn't work; the acrobat reader says the
signature is not valid.
I have read in previous posts that the size of the buffer depends on the
signature size and the hash. Is there a way i could make the array big enought
so i don't have this problem? I have to work with keys of both sizes (2Kb and 4
Kb) and would like to know:
a) If is there a way i can calculate the size necessary from the certificate.
b) If i can use a size (lets say 1Kb) for the array so it should work with
every certificate, independently of it's size (i don't know if you MUST use a
128 bytes lenght array when singing with a 2 Kb key, o if you CAN use a 128
bytes (or bigger, this must be the minimum) length array.
Regards.
Eneko González Benito.
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