Add ECDSA #125
Add ECDSA #125
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ghost
assigned 
| @@ -67,6 +67,7 @@ decred-tx, ipld, 0xe1, Decred Tx | |||
| ipld-ns, namespace, 0xe2, IPLD path | |||
| ipfs-ns, namespace, 0xe3, IPFS path | |||
| swarm-ns, namespace, 0xe4, Swarm path | |||
| ECDSA, multihash, 0xec, ECDSA signature | |||
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This wouldn't be a multihash, it would be a signature. So we're on the same page, how are you planning on using this codec to identify ECDSA signatures?
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do we have plans on doing a “multisign” at some point?
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We do but it's unclear how this should look. The signature algorithm is usually a property of the key, not the signature, and libp2p actually has an ECDSA key type.
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I'm working on clojure implementation of multisig and multikey.
Multikey is for expressing public keys and would look like this: algo+length+x509encodedKey
Where algo is ecdsa, rsa, or other, length is length of x509encodedKey.
Multisig is for expressing signatures and would look like this: algo+length+signatureBytes
Where algo could be sha256-with-ecdsa.
Unlike with multihashes, it would not be possible to compare payloads for equality (as signature may be different for the same data each time the signature is calculated), but having a public key it would still be possible to verify the signature.
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IMO, ECDSA is a bit too generic. For example, how do you distinguish between secp256k1 and r1?
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Do you still need curve params if you have x509encodedKey as part of multikey?
Elliptic Curve Digital Signature Algorithm or ECDSA is a cryptographic algorithm used by many most?) blockchains to sign data.
Would love to use multicodec for my work with the BSV blockchain so please have a look at toe one line PR.