@zk-kit/poseidon-cipher - npm Package Compare versions

Comparing version 0.1.1 to 0.2.0

dist/types/poseidonCipher.d.ts

@@ -19,1 +19,11 @@ import { CipherText, EncryptionKey, Nonce, PlainText } from "./types";
 export declare const poseidonDecrypt: (ciphertext: CipherText<bigint>, key: EncryptionKey<bigint>, nonce: Nonce<bigint>, length: number) => PlainText<bigint>;
+/**
+ * Decrypt some ciphertext using poseidon encryption
+ * @dev Do not throw if the plaintext is invalid
+ * @param ciphertext the ciphertext to decrypt
+ * @param key the key to decrypt with
+ * @param nonce the nonce used to encrypt
+ * @param length the length of the plaintext
+ * @returns the plaintext
+ */
+export declare const poseidonDecryptWithoutCheck: (ciphertext: CipherText<bigint>, key: EncryptionKey<bigint>, nonce: Nonce<bigint>, length: number) => PlainText<bigint>;

package.json

 {
     "name": "@zk-kit/poseidon-cipher",
-    "version": "0.1.1",
+    "version": "0.2.0",
     "description": "Poseidon encryption and decryption in TypeScript.",
@@ -50,4 +50,5 @@ "license": "MIT",
     "dependencies": {
-        "@zk-kit/baby-jubjub": "0.1.0"
+        "@zk-kit/baby-jubjub": "0.1.1",
+        "@zk-kit/utils": "0.1.0"
     }
 }

src/poseidonCipher.ts

@@ -128,1 +128,42 @@ // https://github.com/weijiekoh/circomlib/blob/feat/poseidon-encryption/
 }
+
+/**
+ * Decrypt some ciphertext using poseidon encryption
+ * @dev Do not throw if the plaintext is invalid
+ * @param ciphertext the ciphertext to decrypt
+ * @param key the key to decrypt with
+ * @param nonce the nonce used to encrypt
+ * @param length the length of the plaintext
+ * @returns the plaintext
+ */
+export const poseidonDecryptWithoutCheck = (
+    ciphertext: CipherText<bigint>,
+    key: EncryptionKey<bigint>,
+    nonce: Nonce<bigint>,
+    length: number
+): PlainText<bigint> => {
+    // Create the initial state
+    // S = (0, kS[0], kS[1], N + l ∗ 2^128).
+    let state = [Fr.zero, Fr.e(key[0]), Fr.e(key[1]), Fr.add(Fr.e(nonce), Fr.mul(Fr.e(BigInt(length)), two128))]
+
+    const message = []
+
+    const n = Math.floor(ciphertext.length / 3)
+
+    for (let i = 0; i < n; i += 1) {
+        // Iterate Poseidon on the state
+        state = poseidonPerm(state)
+
+        // Release three elements of the message
+        message.push(Fr.sub(ciphertext[i * 3], state[1]))
+        message.push(Fr.sub(ciphertext[i * 3 + 1], state[2]))
+        message.push(Fr.sub(ciphertext[i * 3 + 2], state[3]))
+
+        // Modify the state
+        state[1] = ciphertext[i * 3]
+        state[2] = ciphertext[i * 3 + 1]
+        state[3] = ciphertext[i * 3 + 2]
+    }
+
+    return message.slice(0, length)
+}

No alert changes

Improved metrics

Total package byte prevSize

5010775

increased by0.04%

Lines of code

56703

increased by0.08%

Worsened metrics

Dependency count

2

increased by100%

Dependency changes

• + Added@zk-kit/utils@0.1.0

• + Added@zk-kit/baby-jubjub@0.1.1(transitive)

• - Removed@zk-kit/baby-jubjub@0.1.0(transitive)

• Updated@zk-kit/baby-jubjub@0.1.1