Import libsodium-wrappers-sumo via the default export

Fixes Node module resolution.

Partially based on #11 by @lgarron.

Fixes #9

lib/format.ts

@@ -1,4 +1,5 @@
-import { base64_variants, from_base64, from_string, to_base64, to_string } from "libsodium-wrappers-sumo"
+import sodium from "libsodium-wrappers-sumo"
+const { base64_variants, from_base64, from_string, to_base64, to_string } = sodium
 
 export const decodeBase64 = (s: string) => from_base64(s, base64_variants.ORIGINAL_NO_PADDING)
 export const encodeBase64 = (s: Uint8Array) => to_base64(s, base64_variants.ORIGINAL_NO_PADDING)

lib/hkdf.ts

@@ -1,5 +1,4 @@
-import * as sodium from "libsodium-wrappers-sumo"
-import { from_string } from "libsodium-wrappers-sumo"
+import sodium from "libsodium-wrappers-sumo"
 
 // @types/libsodium-wrappers-sumo is missing these definitions.
 declare module "libsodium-wrappers-sumo" {
@@ -17,7 +16,7 @@ export function HKDF(ikm: Uint8Array, salt: Uint8Array | null, info: string): Ui
     const prk = sodium.crypto_auth_hmacsha256_final(h)
 
     const infoAndCounter = new Uint8Array(info.length + 1)
-    infoAndCounter.set(from_string(info))
+    infoAndCounter.set(sodium.from_string(info))
     infoAndCounter[info.length] = 1
 
     return sodium.crypto_auth_hmacsha256(infoAndCounter, prk)

lib/index.ts

@@ -1,5 +1,4 @@
-import * as sodium from "libsodium-wrappers-sumo"
-import { from_string, to_string } from "libsodium-wrappers-sumo"
+import sodium from "libsodium-wrappers-sumo"
 import { decode as decodeBech32, encode as encodeBech32 } from "bech32-buffer"
 import { scryptUnwrap, scryptWrap, x25519Identity, x25519Unwrap, x25519Wrap } from "./recipients.js"
 import { encodeHeader, encodeHeaderNoMAC, parseHeader, Stanza } from "./format.js"
@@ -74,7 +73,7 @@ class Encrypter {
 
   encrypt(file: Uint8Array | string): Uint8Array {
     if (typeof file === "string") {
-      file = from_string(file)
+      file = sodium.from_string(file)
     }
 
     const fileKey = sodium.randombytes_buf(16)
@@ -142,7 +141,7 @@ class Decrypter {
     const payload = h.rest.subarray(16)
 
     const out = decryptSTREAM(streamKey, payload)
-    if (outputFormat === "text") return to_string(out)
+    if (outputFormat === "text") return sodium.to_string(out)
     return out
   }
 

lib/recipients.ts

@@ -1,4 +1,4 @@
-import * as sodium from "libsodium-wrappers-sumo"
+import sodium from "libsodium-wrappers-sumo"
 import { decodeBase64, encodeBase64, Stanza } from "./format.js"
 import { HKDF } from "./hkdf.js"
 

lib/stream.ts

@@ -1,4 +1,4 @@
-import * as sodium from "libsodium-wrappers-sumo"
+import sodium from "libsodium-wrappers-sumo"
 
 // We can't use sodium.crypto_aead_chacha20poly1305_IETF_ABYTES here before
 // sodium.ready, or it will make the constant be silently NaN, and nothing will