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Status Future consideration
Workspace DataPower Gateway
Created by Guest
Created on Jun 3, 2020

ecdsa-sha256 signature ASN.1 syntax

Please consider to make DataPower's cypto module "sign" API respect RFC5753 (Use of Elliptic Curve Cryptography (ECC) Algorithms in Cryptographic Message Syntax), which states that signature must contain the DER encoding.

crypto module is currently using ieee-p1363 signature format, that is not a DER encoding (as an octet string) of a value of the ASN.1 type ECDSA-Sig-Value.
It would be very useful to have an input parameter e.g. dsaEncoding to specify the format of the generated signature. Its value could be one of the following:

'der' : DER-encoded ASN.1 signature structure encoding (r, s).
'ieee-p1363' (default): Signature format r || s as proposed in IEEE-P1363.

Idea Priority Urgent
Use Case
signing of arbitrary content with sign API var payload = new Buffer.from(B64payload, 'base64'); var sign = crypto.createSign('ecdsa-sha256'); sign.update(payload).sign(key, 'base64', function(error, signature)
RFE ID 142828
RFE URL
RFE Product IBM DataPower Gateways