public static async Task <RequestDidPowerUp> fromWallet(Wallet senderWallet, String pairwiseDid, List <StdCoin> amount, RSAPrivateKey privateKey)
{
// Get the timestamp
String timestamp = GenericUtils.getTimeStampEpoch(); // RC 20200913: Be careful, the Dart version uses a different timestamp format non ISO-8601 - Why?
String senderDid = senderWallet.bech32Address;
// Build and sign the signature
byte[] signedSignatureHash = SignHelper.signPowerUpSignature(
senderDid: senderDid,
pairwiseDid: pairwiseDid,
timestamp: timestamp,
rsaPrivateKey: privateKey);
// Build the payload -*
DidPowerUpRequestPayload payload = new DidPowerUpRequestPayload(
senderDid: senderDid,
pairwiseDid: pairwiseDid,
timeStamp: timestamp,
signature: Convert.ToBase64String(signedSignatureHash)
);
// =============
// Encrypt proof
// =============
// Generate an AES-256 key
KeyParameter aesKey = KeysHelper.generateAesKey(); // await ?
// Encrypt the payload
byte[] encryptedProof = EncryptionHelper.encryptStringWithAesGCM(JsonConvert.SerializeObject(payload), aesKey);
// =================
// Encrypt proof key
// =================
// Encrypt the key using the Tumbler public RSA key
RSAPublicKey rsaPubTkKey = await EncryptionHelper.getGovernmentRsaPubKey(senderWallet.networkInfo.lcdUrl);
byte[] encryptedProofKey = EncryptionHelper.encryptBytesWithRsa(aesKey.GetKey(), rsaPubTkKey);
// Build the message
RequestDidPowerUp request = new RequestDidPowerUp(
claimantDid: senderDid,
amount: amount,
powerUpProof: Convert.ToBase64String(encryptedProof),
uuid: Guid.NewGuid().ToString(),
encryptionKey: Convert.ToBase64String(encryptedProofKey)
);
return(request);
}
/// Computes the [DidDocumentProof] based on the given [controller], [verificationMethod] and [proofSignatureContent]
static DidDocumentProof _computeProof(
String controller,
String verificationMethod,
DidDocumentProofSignatureContent proofSignatureContent,
Wallet wallet,
String proofPurpose = "authentication")
{
return(new DidDocumentProof(
type: "EcdsaSecp256k1VerificationKey2019",
timestamp: GenericUtils.getTimeStamp(),
proofPurpose: proofPurpose,
controller: controller,
verificationMethod: verificationMethod,
signatureValue: Convert.ToBase64String(SignHelper.signSorted(proofSignatureContent.toJson(), wallet))
));
}
