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3.3-chapter.md

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3.3 Create a Ddo

Use cases

Perform a transaction to set the specified DidDocument as being associated with the address present inside the specified wallet.

Tools

The Commercio SDK, our own open source tool to format transactions to Commercio.network

Functions and APIs

  • DidDocumentHelper fromWallet;
  • IdHelper setDidDocument;
  • KeysHelper generateRsaKeyPair;

Background

From Wikipedia:

RSA (Rivest–Shamir–Adleman) is one of the first public-key cryptosystems and is widely used for secure data transmission. Elliptic-curve cryptography (ECC) is an approach to public-key cryptography based on the algebraic structure of elliptic curves over finite fields. ECC requires smaller keys compared to non-EC cryptography (based on plain Galois fields) to provide equivalent security.

Step by step sequence

  1. Generate the Verification RSA key;
  2. Generate the Signature RSA key;
  3. Call the DidDocumentHelper fromWallet function to create the Did Document;
  4. Finally, execute IdHelper setDidDocument function to set the Did Document.

Code Examples

Here's an example of the implemetation in all the available languages.

Dart

final rsaVerificationKeyPair = await KeysHelper.generateRsaKeyPair();
final rsaVerificationPubKey = rsaVerificationKeyPair.publicKey;
final rsaSignatureKeyPair =
    await KeysHelper.generateRsaKeyPair(type: 'RsaSignatureKey2018');
final rsaSignaturePubKey = rsaSignatureKeyPair.publicKey;
final didDocument =  DidDocumentHelper.fromWallet(
  wallet,
  [rsaVerificationPubKey, rsaSignaturePubKey],
);
await IdHelper.setDidDocument(didDocument, wallet);

Kotlin

val rsaVerificationKeyPair = KeysHelper.generateRsaKeyPair()
val rsaSignatureKeyPair = KeysHelper.generateRsaKeyPair(type = "RsaSignatureKey2018")
val fee = StdFee(gas = "200000", amount = listOf(StdCoin(denom = "ucommercio", amount = "10000"))) // optional
val mode = TxHelper.BroadcastingMode.BLOCK // optional

val didDocument = DidDocumentHelper.fromWallet(
    wallet = wallet,
    pubKeys = listOf(rsaVerificationKeyPair.publicWrapper, rsaSignatureKeyPair.publicWrapper)
)

val response = IdHelper.setDidDocument(
    didDocument = didDocument,
    wallet = wallet,
    fee = fee,
    mode = mode
)

C#

var rsaKeyPair = commercio.sdk.KeysHelper.generateRsaKeyPair();
var ecKeyPair = commercio.sdk.KeysHelper.generateEcKeyPair();

var pubKeys = new List<commercio.sdk.PublicKey>();
pubKeys.Add(rsaKeyPair.publicKey);
pubKeys.Add(ecKeyPair.publicKey);

var didDocument = commercio.sdk.DidDocumentHelper.fromWallet(wallet, pubKeys);
var res = commercio.sdk.IdHelper.setDidDocument(didDocument, wallet);