Hello,
I'm trying to understand or create an efficient procedure for using
ECDSA for authentication of a file. As far as I can see, one sends the
file, and sends the signature as a DER encoded pair or integers, in a
separate file. The receiver does need the public key point to verify
the signature, though, as well as knowledge of the EC curve parameters
or curve name, and the receiver also needs to know which digest was used
for the signature.
I am wondering if there is a standard for ASN.1 / DER file packaging of
the curve, public point, digest, and signature as a single DER encoded
file? If so,
1. Can OpenSSL generate that packaged file? If so, where is this
documented?
2. Where is such a format standard itself documented?
I suppose I could make up such a format, such a as an ASN.1 sequence of
curve oid, Q point octet, and signature, but I hope that somewhere,
someone has already standardized this?
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