This question was originally posted in https://ethereum.stackexchange.com/questions/151471/ethereum-signature-as-xml . I post it here aswell because I rarely get any response there.
I am seeking to express an EIP 191 0x45 message signature according to the XML Signature Syntax.
I assume this curve is the correct one: https://en.bitcoin.it/wiki/Secp256k1
For a signature over sha256("foo") signed by eb3907ecad74a0013c259d5874ae7f22dcbcc95c (pubkey 049f6bb6a7e3f5b7ee71756a891233d1415658f8712bac740282e083dc9240f5368bdb3b256a5bf40a8f7f9753414cb447ee3f796c5f30f7eb40a7f5018fc7f02e), are the parameters applied to the structure given below:
- correct, and
- contain everything needed to verify the signature from scratch (except the data).
<?xml version="1.0"?>
<Signature Id="sig-a0f819f9-6813-4f14-a7c8-f33c12f0c846" xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
<SignatureMethod Algorithm="http://tools.ietf.org/html/rfc6931"/>
<Reference Type="http://www.w3.org/2000/09/xmldsig#SignatureProperties">
<Transforms>
<Transform Algorithm="https://eips.ethereum.org/EIPS/eip-191#version-0x45-e" />
<Transform Algorithm="https://csrc.nist.gov/glossary/term/sha_256" />
</Transforms>
<DigestMethod Algorithm="https://csrc.nist.gov/glossary/term/sha_256" />
<DigestValue>drLpZxTTtebrHRxQkmVDC5B7RPcrKiKwb81NljcrhWU=</DigestValue>
</Reference>
</SignedInfo>
<SignatureValue>r3d2ftvM30Y4D+1vBq9DyAfeS+3OLtoSmSM0DpV3yX52vFXVhxA6NnBXFn81GuHP1rjepuAoIlfeNZT749h4BwA=</SignatureValue>
<KeyInfo>
<KeyName>6zkH7K10oAE8JZ1YdK5/Ity8yVw=</KeyName>
<!-- public key: 049f6bb6a7e3f5b7ee71756a891233d1415658f8712bac740282e083dc9240f5368bdb3b256a5bf40a8f7f9753414cb447ee3f796c5f30f7eb40a7f5018fc7f02e -->
<ECKeyValue xmlns="http://www.w3.org/2009/xmldsig11">
<PublicKey>BJ9rtqfj9bfucXVqiRIz0UFWWPhxK6x0AoLgg9ySQPU2i9s7JWpb9AqPf5dTQUy0R+4/eWxfMPfrQKf1AY/H8C4=</PublicKey>
<ECParameters>
<FieldID>
<Prime>
<P>/////////////////////////////////////v///C8=</P>
</Prime>
</FieldID>
<Curve>
<A>AA==</A>
<B>Bw==</B>
</Curve>
<Base>BHm+Zn753LusVaBilc6HCwcCm/zbLc4o2VnygVsW+BeYSDradyajxGVdpPv8DhEIqP0XtEimhVQZnEfQj/sQ1Lg=</Base>
<Order>/////////////////////rqu3OavSKA7v9JejNA2QUE=</Order>
<CoFactor>1</CoFactor>
</ECParameters>
</ECKeyValue>
</KeyInfo>
<Object>
<SignatureProperties>
<SignatureProperty Id="ts-a0f819f9-6813-4f14-a7c8-f33c12f0c846" Target="sig-a0f819f9-6813-4f14-a7c8-f33c12f0c846">
<timestamp xmlns="https://www.epochconverter.com/">
<epochSeconds>1686900525</epochSeconds>
</timestamp>
</SignatureProperty>
</SignatureProperties>
</Object>
</Signature>
validated against:
