Authenticate with SessionSigs

Once you have obtained SessionSigs, you can replace where you provide an AuthSig with the SessionSigs object. Below are some examples using the Lit SDK.

Making Signing Requests

var unifiedAccessControlConditions = [
  {
    conditionType: "evmBasic",
    contractAddress: "",
    standardContractType: "",
    chain: "ethereum",
    method: "eth_getBalance",
    parameters: [":userAddress", "latest"],
    returnValueTest: {
      comparator: ">=",
      value: "10000000000000",
    },
  },
];

// Saving signing condition
await litNodeClient.saveSigningCondition({
  unifiedAccessControlConditions,
  sessionSigs,
  resourceId,
  chain: "litSessionSign",
});

// Retrieving a signature
let jwt = await litNodeClient.getSignedToken({
  unifiedAccessControlConditions,
  sessionSigs,
  resourceId,
});

Making Encryption Requests

var unifiedAccessControlConditions = [
  {
    conditionType: "evmBasic",
    contractAddress: "",
    standardContractType: "",
    chain: "ethereum",
    method: "eth_getBalance",
    parameters: [":userAddress", "latest"],
    returnValueTest: {
      comparator: ">=",
      value: "10000000000000",
    },
  },
];

// encrypt
const { encryptedZip, symmetricKey } =
  await LitJsSdk.zipAndEncryptString("this is a secret message");

// store the decryption conditions
const encryptedSymmetricKey = await litNodeClient.saveEncryptionKey({
  unifiedAccessControlConditions,
  symmetricKey,
  sessionSigs,
});

// retrieving the key:
const hashOfKey = await LitJsSdk.hashEncryptionKey({
  encryptedSymmetricKey,
});

// Create an access control condition resource
var litResource = new LitAccessControlConditionResource(hashOfKey);

sessionSigs = await LitJsSdk.getSessionSigs({
  chain: "ethereum",
  litNodeClient,
  resourceAbilityRequests: [
    resource: litResource,
    ability: LitAbility.AccessControlConditionDecryption
  ]
});

 const retrievedSymmKey = await litNodeClient.getEncryptionKey({
  unifiedAccessControlConditions,
  toDecrypt: LitJsSdk.uint8arrayToString(
    encryptedSymmetricKey,
    "base16"
  ),
  sessionSigs,
});

const decryptedFiles = await LitJsSdk.decryptZip(
  encryptedZip,
  retrievedSymmKey
);
const decryptedString = await decryptedFiles["string.txt"].async(
  "text"
);
console.log("decrypted string", decryptedString);