diff --git a/native/expo-modules/aes-crypto/ios/AESCryptoModule.swift b/native/expo-modules/aes-crypto/ios/AESCryptoModule.swift
--- a/native/expo-modules/aes-crypto/ios/AESCryptoModule.swift
+++ b/native/expo-modules/aes-crypto/ios/AESCryptoModule.swift
@@ -10,6 +10,7 @@
 
     Function("generateKey", generateKey)
     Function("encrypt", encrypt)
+    Function("decrypt", decrypt)
   }
 }
 
@@ -48,6 +49,31 @@
   ciphertext.copyBytes(to: destination.rawBufferPtr())
 }
 
+private func decrypt(rawKey: Uint8Array,
+                     ciphertext: Uint8Array,
+                     destination: Uint8Array) throws {
+  guard ciphertext.byteLength > IV_LENGTH + TAG_LENGTH,
+        destination.byteLength >= ciphertext.byteLength - IV_LENGTH - TAG_LENGTH
+  else {
+    throw InvalidDataLengthException()
+  }
+  
+  let key = SymmetricKey(data: rawKey.data())
+  let ciphertextData = ciphertext.data()
+  
+  let iv = ciphertextData.prefix(IV_LENGTH)
+  let tag = ciphertextData.suffix(TAG_LENGTH)
+  let ciphertextContent = ciphertextData
+    .dropFirst(IV_LENGTH)
+    .dropLast(TAG_LENGTH)
+  
+  let sealedBox = try AES.GCM.SealedBox(nonce: AES.GCM.Nonce(data: iv),
+                                        ciphertext: ciphertextContent,
+                                        tag: tag)
+  let decryptedData = try AES.GCM.open(sealedBox, using: key)
+  decryptedData.copyBytes(to: destination.rawBufferPtr())
+}
+
 // MARK: - Utilities
 
 extension TypedArray {
diff --git a/native/utils/aes-crypto-module.js b/native/utils/aes-crypto-module.js
--- a/native/utils/aes-crypto-module.js
+++ b/native/utils/aes-crypto-module.js
@@ -14,6 +14,11 @@
     data: Uint8Array,
     destination: Uint8Array,
   ) => void,
+  +decrypt: (
+    key: Uint8Array,
+    data: Uint8Array,
+    destination: Uint8Array,
+  ) => void,
 } = requireNativeModule('AESCrypto');
 
 export function generateKey(): Uint8Array {
@@ -28,3 +33,10 @@
   AESCryptoModule.encrypt(key, data, ciphertext);
   return ciphertext;
 }
+
+export function decrypt(key: Uint8Array, data: Uint8Array): Uint8Array {
+  invariant(AESCryptoModule.decrypt, 'AESCrypto.decrypt is not implemented');
+  const plaintext = new Uint8Array(data.length - IV_LENGTH - TAG_LENGTH);
+  AESCryptoModule.decrypt(key, data, plaintext);
+  return plaintext;
+}