refactor(sdk): Code Organization Improvements

packages/fhevm-sdk/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@fhevm-sdk",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "private": true,
   "type": "module",
   "main": "dist/index.js",
@@ -15,18 +15,63 @@
       "types": "./src/core/index.ts",
       "default": "./dist/core/index.js"
     },
+    "./core/config": {
+      "types": "./src/core/config.ts",
+      "default": "./dist/core/config.js"
+    },
+    "./core/client": {
+      "types": "./src/core/FhevmClient.ts",
+      "default": "./dist/core/FhevmClient.js"
+    },
     "./storage": {
       "types": "./src/storage/index.ts",
       "default": "./dist/storage/index.js"
     },
     "./types": {
-      "types": "./src/fhevmTypes.ts",
-      "default": "./dist/fhevmTypes.js"
+      "types": "./src/types/index.ts",
+      "default": "./dist/types/index.js"
+    },
+    "./utils": {
+      "types": "./src/utils/index.ts",
+      "default": "./dist/utils/index.js"
+    },
+    "./utils/errors": {
+      "types": "./src/utils/errors.ts",
+      "default": "./dist/utils/errors.js"
+    },
+    "./utils/encryption": {
+      "types": "./src/utils/encryption.ts",
+      "default": "./dist/utils/encryption.js"
+    },
+    "./utils/decryption": {
+      "types": "./src/utils/decryption.ts",
+      "default": "./dist/utils/decryption.js"
     },
     "./react": {
       "types": "./src/react/index.ts",
       "default": "./dist/react/index.js"
-    }
+    },
+    "./react/useFhevm": {
+      "types": "./src/react/useFhevm.tsx",
+      "default": "./dist/react/useFhevm.js"
+    },
+    "./react/useFHEEncryption": {
+      "types": "./src/react/useFHEEncryption.ts",
+      "default": "./dist/react/useFHEEncryption.js"
+    },
+    "./react/useFHEDecrypt": {
+      "types": "./src/react/useFHEDecrypt.ts",
+      "default": "./dist/react/useFHEDecrypt.js"
+    },
+    "./version": {
+      "types": "./src/version.ts",
+      "default": "./dist/version.js"
+    },
+    "./constants": {
+      "types": "./src/internal/constants.ts",
+      "default": "./dist/internal/constants.js"
+    },
+    "./package.json": "./package.json"
   },
   "scripts": {
     "build": "tsc -p tsconfig.json",

packages/fhevm-sdk/src/FhevmDecryptionSignature.ts

@@ -1,5 +1,7 @@
 import { GenericStringStorage } from "./storage/GenericStringStorage";
 import { EIP712Type, FhevmDecryptionSignatureType, FhevmInstance } from "./fhevmTypes";
+import { DEFAULT_SIGNATURE_DURATION_DAYS } from "./internal/constants";
+import { FhevmSignatureError } from "./utils/errors";
 import { ethers } from "ethers";
 
 function _timestampNow(): number {
@@ -236,7 +238,7 @@ export class FhevmDecryptionSignature {
     try {
       const userAddress = (await signer.getAddress()) as `0x${string}`;
       const startTimestamp = _timestampNow();
-      const durationDays = 365;
+      const durationDays = DEFAULT_SIGNATURE_DURATION_DAYS;
       const eip712 = (instance as any).createEIP712(publicKey, contractAddresses, startTimestamp, durationDays);
       const signature = await (signer as any).signTypedData(
         eip712.domain,