diff --git a/native/expo-modules/aes-crypto/android/src/main/java/app/comm/android/aescrypto/AESCryptoModule.kt b/native/expo-modules/aes-crypto/android/src/main/java/app/comm/android/aescrypto/AESCryptoModule.kt
--- a/native/expo-modules/aes-crypto/android/src/main/java/app/comm/android/aescrypto/AESCryptoModule.kt
+++ b/native/expo-modules/aes-crypto/android/src/main/java/app/comm/android/aescrypto/AESCryptoModule.kt
@@ -8,6 +8,7 @@
 import javax.crypto.Cipher
 import javax.crypto.KeyGenerator
 import javax.crypto.SecretKey
+import javax.crypto.spec.GCMParameterSpec
 import javax.crypto.spec.SecretKeySpec
 
 private const val ALGORITHM_AES = "AES"
@@ -24,6 +25,7 @@
 
     Function("generateKey", this@AESCryptoModule::generateKey)
     Function("encrypt", this@AESCryptoModule::encrypt)
+    Function("decrypt", this@AESCryptoModule::decrypt)
   }
 
   // region Function implementations
@@ -75,6 +77,33 @@
     destination.write(ciphertext, position = IV_LENGTH, size = ciphertext.size)
   }
 
+  /**
+   * Decrypts given [ciphertext] using provided key and stores decrypted
+   * plaintext in the [destination] array.
+   *
+   * @param rawKey AES-256 key bytes. Must be of length [KEY_SIZE]
+   * @param ciphertext Typed array consisting of 12-byte IV, followed by
+   * actual ciphertext content and ending with 16-byte GCM tag.
+   * @param destination should be of ciphertext content length
+   */
+  private fun decrypt(
+    rawKey: Uint8Array,
+    ciphertext: Uint8Array,
+    destination: Uint8Array
+  ) {
+    if (ciphertext.byteLength <= IV_LENGTH + TAG_LENGTH ||
+      destination.byteLength < ciphertext.byteLength - IV_LENGTH - TAG_LENGTH) {
+      throw InvalidDataLengthException()
+    }
+    val key = rawKey.toAESSecretKey()
+    val input = ciphertext.toDirectBuffer()
+    val iv = ByteArray(IV_LENGTH).also(input::get)
+    val ciphertextBytes = ByteArray(input.remaining()).also(input::get)
+    val plaintext = decryptAES(ciphertextBytes, key, iv)
+
+    destination.write(plaintext, position = 0, size = plaintext.size)
+  }
+
   // endregion
 }
 
@@ -99,6 +128,22 @@
   return Pair(iv, ciphertext)
 }
 
+/**
+ * Does the reverse of the [encryptAES] function.
+ * Decrypts the [ciphertext] with given [key] and [iv]
+ */
+private fun decryptAES(
+  ciphertext: ByteArray,
+  key: SecretKey,
+  iv: ByteArray
+): ByteArray {
+  val spec = GCMParameterSpec(TAG_LENGTH * 8, iv)
+  val cipher = Cipher.getInstance(CIPHER_TRANSFORMATION_NAME).apply {
+    init(Cipher.DECRYPT_MODE, key, spec)
+  }
+  return cipher.doFinal(ciphertext)
+}
+
 // endregion
 
 // region Utility extension functions
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
@@ -1,7 +1,6 @@
 // @flow
 
 import { requireNativeModule } from 'expo-modules-core';
-import invariant from 'invariant';
 
 const KEY_SIZE = 32;
 const IV_LENGTH = 12;
@@ -34,7 +33,6 @@
 }
 
 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;