diff --git a/NDecrypt.Core/DecryptArgs.cs b/NDecrypt.Core/DecryptArgs.cs
index 160d712..a1e69e1 100644
--- a/NDecrypt.Core/DecryptArgs.cs
+++ b/NDecrypt.Core/DecryptArgs.cs
@@ -2,6 +2,7 @@ using System;
 using System.IO;
 using SabreTools.IO.Extensions;
 using SabreTools.IO.Readers;
+using SabreTools.Matching;
 
 namespace NDecrypt.Core
 {
@@ -300,47 +301,41 @@ namespace NDecrypt.Core
         /// </summary>
         public byte[] AESHardwareConstant { get; private set; } = [];
 
-        #region Retail Keys
-
         /// <summary>
         /// KeyX 0x18 (New 3DS 9.3)
         /// </summary>
         public byte[] KeyX0x18 { get; private set; } = [];
 
-        /// <summary>
-        /// KeyX 0x1B (New 3DS 9.6)
-        /// </summary>
-        public byte[] KeyX0x1B { get; private set; } = [];
-
-        /// <summary>
-        /// KeyX 0x25 (> 7.x)
-        /// </summary>
-        public byte[] KeyX0x25 { get; private set; } = [];
-
-        /// <summary>
-        /// KeyX 0x2C (< 6.x)
-        /// </summary>
-        public byte[] KeyX0x2C { get; private set; } = [];
-
-        #endregion
-
-        #region Development Keys
-
         /// <summary>
         /// Dev KeyX 0x18 (New 3DS 9.3)
         /// </summary>
         public byte[] DevKeyX0x18 { get; private set; } = [];
 
+        /// <summary>
+        /// KeyX 0x1B (New 3DS 9.6)
+        /// </summary>
+        public byte[] KeyX0x1B { get; private set; } = [];
+
         /// <summary>
         /// Dev KeyX 0x1B New 3DS 9.6)
         /// </summary>
         public byte[] DevKeyX0x1B { get; private set; } = [];
 
+        /// <summary>
+        /// KeyX 0x25 (> 7.x)
+        /// </summary>
+        public byte[] KeyX0x25 { get; private set; } = [];
+
         /// <summary>
         /// Dev KeyX 0x25 (> 7.x)
         /// </summary>
         public byte[] DevKeyX0x25 { get; private set; } = [];
 
+        /// <summary>
+        /// KeyX 0x2C (< 6.x)
+        /// </summary>
+        public byte[] KeyX0x2C { get; private set; } = [];
+
         /// <summary>
         /// Dev KeyX 0x2C (< 6.x)
         /// </summary>
@@ -348,6 +343,152 @@ namespace NDecrypt.Core
 
         #endregion
 
+        #region Internal Test Values
+
+        /// <summary>
+        /// Initial value for key validation tests
+        /// </summary>
+        private static readonly byte[] TestIV =
+        [
+            0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+            0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
+        ];
+
+        /// <summary>
+        /// Pattern to use for key validation tests
+        /// </summary>
+        private static readonly byte[] TestPattern =
+        [
+            0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
+            0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
+            0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
+            0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
+            0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
+            0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
+            0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
+            0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
+        ];
+
+        /// <summary>
+        /// Expected output value for KeyX0x18
+        /// </summary>
+        private static readonly byte[] ExpectedKeyX0x18 =
+        [
+            0x06, 0xF1, 0xB2, 0x3B, 0x12, 0xAD, 0x80, 0xC1,
+            0x13, 0xC6, 0x18, 0x3D, 0x27, 0xB8, 0xB9, 0x95,
+            0x49, 0x73, 0x59, 0x82, 0xEF, 0xFE, 0x16, 0x48,
+            0x91, 0x2A, 0x89, 0x55, 0x9A, 0xDC, 0x3C, 0xA0,
+            0x84, 0x46, 0x14, 0xE0, 0x16, 0x59, 0x8E, 0x4F,
+            0xC2, 0x6C, 0x52, 0xA4, 0x7D, 0xAD, 0x4F, 0x23,
+            0xF1, 0xC6, 0x99, 0x44, 0x39, 0xB7, 0x42, 0xF0,
+            0x1F, 0xBB, 0x02, 0xF6, 0x0A, 0x8A, 0xC2, 0x9A,
+        ];
+
+        /// <summary>
+        /// Expected output value for DevKeyX0x18
+        /// </summary>
+        private static readonly byte[] ExpectedDevKeyX0x18 =
+        [
+            0x99, 0x6E, 0x3C, 0x54, 0x97, 0x3C, 0xEA, 0xE8,
+            0xBA, 0xAE, 0x18, 0x5C, 0x93, 0x27, 0x65, 0x50,
+            0xF6, 0x6D, 0x67, 0xD7, 0xEF, 0xBD, 0x7C, 0xCB,
+            0x8A, 0xC1, 0x1A, 0x54, 0xFC, 0x3B, 0x8B, 0x3A,
+            0x0E, 0xE5, 0xEF, 0x27, 0x4A, 0x73, 0x7E, 0x0A,
+            0x2E, 0x2E, 0x9D, 0xAF, 0x6C, 0x03, 0xF2, 0x91,
+            0xC4, 0xFA, 0x73, 0xFD, 0x6B, 0xA0, 0x07, 0xD4,
+            0x75, 0x5B, 0x6F, 0x2E, 0x8B, 0x68, 0x4C, 0xD1,
+        ];
+
+        /// <summary>
+        /// Expected output value for KeyX0x1B
+        /// </summary>
+        private static readonly byte[] ExpectedKeyX0x1B =
+        [
+            0x0A, 0xE4, 0x79, 0x02, 0x1B, 0xFA, 0x25, 0x4B,
+            0x2D, 0x92, 0x4F, 0xA8, 0x41, 0x59, 0xCE, 0x10,
+            0x09, 0xE6, 0x08, 0x61, 0x23, 0xC7, 0xD2, 0x30,
+            0x84, 0x37, 0xD5, 0x49, 0x42, 0x94, 0xB2, 0x70,
+            0x6A, 0xF3, 0x75, 0xB0, 0x1F, 0x4F, 0xA1, 0xCE,
+            0x03, 0xA2, 0x6A, 0x19, 0x5D, 0x32, 0x0D, 0xB5,
+            0x79, 0xCD, 0xFD, 0xF0, 0xDE, 0x49, 0x26, 0x2D,
+            0x29, 0x36, 0x30, 0x69, 0x8B, 0x45, 0xE1, 0xFC,
+        ];
+
+        /// <summary>
+        /// Expected output value for DevKeyX0x1B
+        /// </summary>
+        private static readonly byte[] ExpectedDevKeyX0x1B =
+        [
+            0x16, 0x4F, 0xD9, 0x58, 0xC9, 0x20, 0xB3, 0xED,
+            0xC4, 0xEB, 0x57, 0x39, 0x10, 0xEF, 0xA8, 0xCC,
+            0xE5, 0x49, 0xBF, 0x52, 0x10, 0xA9, 0xCC, 0xE1,
+            0x65, 0x3B, 0x2D, 0x51, 0x45, 0xFB, 0x60, 0x52,
+            0x3E, 0x29, 0xEB, 0xEB, 0x3F, 0xF2, 0x76, 0x08,
+            0x00, 0x05, 0x7F, 0x64, 0x29, 0x4A, 0x17, 0x22,
+            0x56, 0x7F, 0x49, 0x94, 0x1A, 0x8C, 0x56, 0x35,
+            0x38, 0xBE, 0xA4, 0x2E, 0x58, 0xD3, 0x81, 0x8C,
+        ];
+
+        /// <summary>
+        /// Expected output value for KeyX0x25
+        /// </summary>
+        private static readonly byte[] ExpectedKeyX0x25 =
+        [
+            0x37, 0xBC, 0x73, 0xD6, 0xEE, 0x73, 0xE0, 0x94,
+            0x42, 0x84, 0x74, 0xE5, 0xD8, 0xFB, 0x5F, 0x65,
+            0xF4, 0xCF, 0x2E, 0xC1, 0x43, 0x48, 0x6C, 0xAA,
+            0xC8, 0xF9, 0x96, 0xE6, 0x33, 0xDD, 0xE7, 0xBF,
+            0xD2, 0x21, 0x89, 0x39, 0x13, 0xD1, 0xEC, 0xCA,
+            0x1D, 0x5D, 0x1F, 0x77, 0x95, 0xD2, 0x8B, 0x27,
+            0x92, 0x79, 0xC5, 0x1D, 0x72, 0xA7, 0x28, 0x57,
+            0x41, 0x0E, 0x46, 0xB8, 0x80, 0x7B, 0x7C, 0x0D,
+        ];
+
+        /// <summary>
+        /// Expected output value for DevKeyX0x25
+        /// </summary>
+        private static readonly byte[] ExpectedDevKeyX0x25 =
+        [
+            0x71, 0x65, 0x30, 0xF2, 0x68, 0xEC, 0x65, 0x0A,
+            0x8C, 0x9E, 0xC5, 0x5A, 0xFA, 0x37, 0x8E, 0xDA,
+            0x7B, 0x58, 0x3B, 0x66, 0x7C, 0x9D, 0x16, 0xD9,
+            0x2D, 0x8F, 0xCF, 0x04, 0x66, 0x7F, 0x27, 0x41,
+            0xBF, 0x5F, 0x1E, 0x11, 0x4C, 0xD6, 0xB9, 0x0A,
+            0xC5, 0x42, 0xCF, 0x2B, 0x87, 0x6B, 0xD4, 0x72,
+            0x4D, 0x9C, 0x29, 0x2E, 0xF8, 0xB0, 0x6F, 0x22,
+            0x35, 0x5B, 0x96, 0x83, 0xD1, 0xE4, 0x5E, 0xDB,
+        ];
+
+        /// <summary>
+        /// Expected output value for KeyX0x2C
+        /// </summary>
+        private static readonly byte[] ExpectedKeyX0x2C =
+        [
+            0xAE, 0x44, 0x20, 0xDB, 0xA5, 0x96, 0xDC, 0xF3,
+            0xD8, 0x23, 0x9E, 0x3C, 0x44, 0x73, 0x3D, 0xCD,
+            0x07, 0xD5, 0xF8, 0xD0, 0xC6, 0xB3, 0x5A, 0x80,
+            0xB5, 0x5A, 0x55, 0x30, 0x5D, 0x4A, 0xBE, 0x61,
+            0xBF, 0xEF, 0x64, 0x17, 0x28, 0xD6, 0x26, 0x52,
+            0x42, 0x4D, 0x8F, 0x1C, 0xBC, 0x63, 0xD3, 0x91,
+            0x7D, 0xA6, 0x4F, 0xAF, 0x26, 0x38, 0x60, 0xEE,
+            0x79, 0x92, 0x2F, 0xD8, 0xCA, 0x4E, 0xE7, 0xEC,
+        ];
+
+        /// <summary>
+        /// Expected output value for DevKeyX0x2C
+        /// </summary>
+        private static readonly byte[] ExpectedDevKeyX0x2C =
+        [
+            0x5F, 0x73, 0xD5, 0x9A, 0x67, 0xFF, 0x8C, 0x12,
+            0x31, 0x58, 0x0B, 0x58, 0x46, 0xFE, 0x05, 0x16,
+            0x92, 0xE4, 0x84, 0x06, 0x18, 0x9B, 0x58, 0x91,
+            0xE7, 0xF8, 0xCD, 0xA9, 0x95, 0xAC, 0x07, 0xCD,
+            0x43, 0x20, 0x7A, 0x8C, 0xCC, 0xAB, 0x48, 0x50,
+            0x29, 0x2F, 0x96, 0x73, 0xB0, 0xD9, 0xE5, 0xCB,
+            0xE6, 0x9A, 0x0D, 0xF7, 0xD0, 0x1E, 0xC2, 0xEC,
+            0xC1, 0xE2, 0x8E, 0xEE, 0x89, 0xB9, 0xB1, 0x97,
+        ];
+
         #endregion
 
         /// <summary>
@@ -371,6 +512,9 @@ namespace NDecrypt.Core
                 InitAesKeysTxt(keyfile);
             else
                 InitKeysBin(keyfile);
+
+            // Perform validation tests
+            ValidateKeys();
         }
 
         /// <summary>
@@ -571,6 +715,88 @@ namespace NDecrypt.Core
             IsReady = true;
         }
 
+        /// <summary>
+        /// Validate that all keys provided are going to be valid
+        /// </summary>
+        /// <remarks>Does not know what the keys are, just the result</remarks>
+        /// TODO: Do something with these results?
+        private void ValidateKeys()
+        {
+            Console.WriteLine("DEBUG: Validating provided keys");
+
+            // KeyX0x18
+            if (KeyX0x18.Length > 0)
+            {
+                var cipher = CommonOperations.CreateAESEncryptionCipher(KeyX0x18, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                bool match = Extensions.EqualsExactly(ExpectedKeyX0x18, actual);
+                Console.WriteLine($"KeyX0x18 match: {match}");
+            }
+
+            // DevKeyX0x18
+            if (DevKeyX0x18.Length > 0)
+            {
+                var cipher = CommonOperations.CreateAESEncryptionCipher(DevKeyX0x18, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                bool match = Extensions.EqualsExactly(ExpectedDevKeyX0x18, actual);
+                Console.WriteLine($"DevKeyX0x18 match: {match}");
+            }
+
+            // KeyX0x1B
+            if (KeyX0x1B.Length > 0)
+            {
+                var cipher = CommonOperations.CreateAESEncryptionCipher(KeyX0x1B, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                bool match = Extensions.EqualsExactly(ExpectedKeyX0x1B, actual);
+                Console.WriteLine($"KeyX0x1B match: {match}");
+            }
+
+            // DevKeyX0x1B
+            if (DevKeyX0x1B.Length > 0)
+            {
+                var cipher = CommonOperations.CreateAESEncryptionCipher(DevKeyX0x1B, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                bool match = Extensions.EqualsExactly(ExpectedDevKeyX0x1B, actual);
+                Console.WriteLine($"DevKeyX0x1B match: {match}");
+            }
+
+            // KeyX0x25
+            if (KeyX0x25.Length > 0)
+            {
+                var cipher = CommonOperations.CreateAESEncryptionCipher(KeyX0x25, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                bool match = Extensions.EqualsExactly(ExpectedKeyX0x25, actual);
+                Console.WriteLine($"KeyX0x25 match: {match}");
+            }
+
+            // DevKeyX0x25
+            if (DevKeyX0x25.Length > 0)
+            {
+                var cipher = CommonOperations.CreateAESEncryptionCipher(DevKeyX0x25, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                bool match = Extensions.EqualsExactly(ExpectedDevKeyX0x25, actual);
+                Console.WriteLine($"DevKeyX0x25 match: {match}");
+            }
+
+            // KeyX0x2C
+            if (KeyX0x2C.Length > 0)
+            {
+                var cipher = CommonOperations.CreateAESEncryptionCipher(KeyX0x2C, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                bool match = Extensions.EqualsExactly(ExpectedKeyX0x2C, actual);
+                Console.WriteLine($"KeyX0x2C match: {match}");
+            }
+
+            // DevKeyX0x2C
+            if (DevKeyX0x2C.Length > 0)
+            {
+                var cipher = CommonOperations.CreateAESEncryptionCipher(DevKeyX0x2C, TestIV);
+                byte[] actual = cipher.ProcessBytes(TestPattern);
+                bool match = Extensions.EqualsExactly(ExpectedDevKeyX0x2C, actual);
+                Console.WriteLine($"DevKeyX0x2C match: {match}");
+            }
+        }
+
         // https://stackoverflow.com/questions/311165/how-do-you-convert-a-byte-array-to-a-hexadecimal-string-and-vice-versa
         private static byte[] StringToByteArray(string? hex)
         {