diff --git a/README.md b/README.md
index 11a9f72..a3250ac 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,9 @@ bunx i jsr install @li0ard/crapto1-ts
 
 ## Usage
 
+> [!TIP]
+> Ported mfkey64 and mfkey32 are placed [here](https://github.com/li0ard/crapto1_ts/tree/main/examples)
+
 ### Recovery by 2 sets of 32 bit auth
 ```ts
 import { recovery32 } from "@li0ard/crapto1_ts" // or @li0ard/crapto1-ts
diff --git a/examples/mfkey32.ts b/examples/mfkey32.ts
new file mode 100644
index 0000000..1e7d27d
--- /dev/null
+++ b/examples/mfkey32.ts
@@ -0,0 +1,66 @@
+/**
+ * mfkey32 for TypeScript
+ * 
+ * Ported from https://github.com/equipter/mfkey by li0ard
+ */
+
+import { crypto1_word, lfsr_recovery32, lfsr_rollback_word, prng_successor } from "../src";
+
+if (process.argv.length < 9) {
+    console.log('Usage: [bun/node] ' + process.argv[1] + ' <uid> <tag challenge> <reader challenge> <reader response> <tag challenge #2> <reader challenge #2> <reader response #2>')
+    process.exit(1)
+}
+
+const dec2hex = (dec: number, bits: number) => {
+    if (dec < 0) {
+        return (Math.pow(2, bits) + dec).toString(16).padStart(bits / 4, '0')
+    } else {
+        return dec.toString(16).padStart(bits / 4, '0');
+    }
+}
+
+const uid = parseInt(process.argv[2], 16)
+const chal = parseInt(process.argv[3], 16)
+const rchal = parseInt(process.argv[4], 16)
+const rresp = parseInt(process.argv[5], 16)
+const chal2 = parseInt(process.argv[6], 16)
+const rchal2 = parseInt(process.argv[7], 16)
+const rresp2 = parseInt(process.argv[8], 16)
+
+console.log(`MIFARE Classic key recovery - based 32 bits of keystream
+Recover key from two 32-bit reader authentication answers only
+
+Recovering key for:
+    uid: ${dec2hex(uid, 32)}
+   nt_0: ${dec2hex(chal, 32)}
+ {nr_0}: ${dec2hex(rchal, 32)}
+ {ar_0}: ${dec2hex(rresp, 32)}
+   nt_1: ${dec2hex(chal2, 32)}
+ {nr_1}: ${dec2hex(rchal2, 32)}
+ {ar_1}: ${dec2hex(rresp2, 32)}\n`)
+
+const p64 = prng_successor(chal, 64)
+const p64b = prng_successor(chal2, 64);
+
+console.log(`LFSR successors of the tag challenge:
+  nt': ${dec2hex(p64, 32)}
+ nt'': ${dec2hex(p64b, 32)}\n`)
+
+let ks2 = rresp ^ p64;
+
+console.log(`Keystream used to generate {ar} and {at}:
+  ks2: ${dec2hex(ks2, 32)}\n`)
+
+let s = lfsr_recovery32(rresp ^ p64, 0);
+for (let t = 0; (s[t].odd !== 0) || (s[t].even !== 0); ++t) {
+    lfsr_rollback_word(s[t], 0, false);
+    lfsr_rollback_word(s[t], rchal, true);
+    lfsr_rollback_word(s[t], uid ^ chal, false);
+    let key = s[t].lfsr
+    crypto1_word(s[t], uid ^ chal2, false);
+    crypto1_word(s[t], rchal2, true);
+    if (rresp2 === (crypto1_word(s[t], 0, false) ^ prng_successor(chal2, 64))) {
+        console.log(`Found Key: [${key.toString(16).padStart(12, "0")}]`)
+        break;
+    }
+}
\ No newline at end of file
diff --git a/examples/mfkey64.ts b/examples/mfkey64.ts
new file mode 100644
index 0000000..11c83b6
--- /dev/null
+++ b/examples/mfkey64.ts
@@ -0,0 +1,89 @@
+/**
+ * mfkey64 for TypeScript
+ * 
+ * Ported from https://github.com/equipter/mfkey by li0ard
+ */
+import { crypto1_byte, lfsr_recovery64, lfsr_rollback_byte, lfsr_rollback_word, prng_successor } from "../src"
+
+if (process.argv.length < 7) {
+    console.log('Usage: [bun/node] ' + process.argv[1] + ' <uid> <tag challenge> <reader challenge> <reader response> <tag response>')
+    process.exit(1)
+}
+
+const dec2hex = (dec: number, bits: number) => {
+    if (dec < 0) {
+        return (Math.pow(2, bits) + dec).toString(16).padStart(bits / 4, '0')
+    } else {
+        return dec.toString(16).padStart(bits / 4, '0');
+    }
+}
+
+const uid = parseInt(process.argv[2], 16)
+const chal = parseInt(process.argv[3], 16)
+const rchal = parseInt(process.argv[4], 16)
+const rresp = parseInt(process.argv[5], 16)
+const tresp = parseInt(process.argv[6], 16)
+
+let encc = process.argv.length - 7
+let enclen: number[] = Array(encc)
+let enc: number[][] = Array.from({ length: encc }, () => new Array(120));
+
+for (let i = 0; i < encc; i++) {
+    enclen[i] = (process.argv[i + 7].length) / 2;
+    for (let i2 = 0; i2 < enclen[i]; i2++) {
+        enc[i][i2] = parseInt(process.argv[i + 7].substring(i2 * 2, i2 * 2 + 2), 16)
+    }
+}
+
+console.log(`MIFARE Classic key recovery - based 64 bits of keystream
+Recovering key for:
+  uid: ${dec2hex(uid, 32)}
+   nt: ${dec2hex(chal, 32)}
+ {nr}: ${dec2hex(rchal, 32)}
+ {ar}: ${dec2hex(rresp, 32)}
+ {at}: ${dec2hex(tresp, 32)}\n`)
+
+for (let i = 0; i < encc; i++) {
+    process.stdout.write(`{enc${i}}: `)
+    for (let i2 = 0; i2 < enclen[i]; i2++) {
+        process.stdout.write(dec2hex(enc[i][i2], 8))
+    }
+    console.log("")
+}
+
+const p64 = prng_successor(chal, 64)
+console.log(`LFSR successors of the tag challenge:
+  nt': ${dec2hex(p64, 32)}
+ nt'': ${dec2hex(prng_successor(p64, 32), 32)}\n`)
+
+const ks2 = rresp ^ p64
+const ks3 = tresp ^ prng_successor(p64, 32)
+
+console.log(`Keystream used to generate {ar} and {at}:
+  ks2: ${dec2hex(ks2, 32)}
+  ks3: ${dec2hex(ks3, 32)}\n`)
+
+let s = lfsr_recovery64(ks2, ks3)[0]
+
+if(process.argv.length > 7) {
+    console.log("Decrypted communication:")
+    let ks4 = 0;
+    let rollb = 0;
+    for (let i = 0; i < encc; i++) {
+        process.stdout.write(`{dec${i}}: `)
+        for (let i2 = 0; i2 < enclen[i]; i2++) {
+            ks4 = crypto1_byte(s, 0, false);
+            process.stdout.write(dec2hex(ks4 ^ enc[i][i2], 8))
+            rollb += 1;
+        }
+        console.log("")
+    }
+    for (let i = 0; i < rollb; i++) lfsr_rollback_byte(s, 0, false)
+}
+
+lfsr_rollback_word(s, 0)
+lfsr_rollback_word(s, 0)
+lfsr_rollback_word(s, rchal, true)
+lfsr_rollback_word(s, uid^chal)
+
+console.log(`\nFound Key: [${s.lfsr.toString(16).padEnd(12, "0")}]\n`)
\ No newline at end of file
diff --git a/src/crapto1.ts b/src/crapto1.ts
index 2d3ce37..b3d407d 100644
--- a/src/crapto1.ts
+++ b/src/crapto1.ts
@@ -1,7 +1,7 @@
 import { prng_successor } from "./crypto1";
 import { LF_POLY_EVEN, LF_POLY_ODD, crypto1_word } from "./crypto1";
 import { Crypto1State } from "./state";
-import { bebit, binsearch, evenParity32, extend_table, extend_table_simple, filter, parity, quicksort } from "./utils";
+import { bebit, binsearch, bit, evenParity32, extend_table, extend_table_simple, filter, parity, quicksort } from "./utils";
 
 /**
  * Rollback the shift register in order to get previous states (for bits)
@@ -26,6 +26,21 @@ export const lfsr_rollback_bit = (s: Crypto1State, in_: number, isEncrypted: boo
     return ret;
 }
 
+/**
+ * Rollback the shift register in order to get previous states (for bytes)
+ * @param s State
+ * @param in_ Word
+ * @param isEncrypted Encrypted?
+ * @returns {number}
+ */
+export const lfsr_rollback_byte = (s: Crypto1State, in_: number, isEncrypted: boolean = false): number => {
+    let ret: number = 0;
+    for (let i = 7; i >= 0; --i) {
+        ret |= lfsr_rollback_bit(s, bit(in_, i), isEncrypted) << i;
+    }
+    return ret;
+}
+
 /**
  * Rollback the shift register in order to get previous states (for words (uint32))
  * @param s State
diff --git a/src/crypto1.ts b/src/crypto1.ts
index ce70873..40a8e1c 100644
--- a/src/crypto1.ts
+++ b/src/crypto1.ts
@@ -1,5 +1,5 @@
 import type { Crypto1State } from "./state";
-import { bebit, filter, parity, swapendian } from "./utils";
+import { bebit, bit, filter, parity, swapendian } from "./utils";
 
 export const LF_POLY_ODD: number = 0x29CE5C;
 export const LF_POLY_EVEN: number = 0x870804;
@@ -33,6 +33,21 @@ export const crypto1_word = (s: Crypto1State, in_: number, isEncrypted: boolean
     return ret;
 }
 
+/**
+ * Proceed Crypto1 encryption/decryption process (for bytes)
+ * @param s State
+ * @param in_ Word
+ * @param isEncrypted Encrypted?
+ * @returns {number}
+ */
+export const crypto1_byte = (s: Crypto1State, in_: number, isEncrypted: boolean = false): number => {
+    let i: number, ret: number = 0;
+    for (i = 0; i < 8; ++i) {
+        ret |= crypto1_bit(s, bit(in_, i), isEncrypted) << i;
+    }
+    return ret;
+}
+
 /**
  * Proceed Crypto1 encryption/decryption process (for bits)
  * @param s State
diff --git a/src/index.ts b/src/index.ts
index d9d6b8d..3ed7422 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,3 +1,3 @@
-export { recovery32, recovery64, lfsr_recovery32, lfsr_recovery64, lfsr_rollback_bit, lfsr_rollback_word } from "./crapto1"
+export { recovery32, recovery64, lfsr_recovery32, lfsr_recovery64, lfsr_rollback_bit, lfsr_rollback_byte, lfsr_rollback_word } from "./crapto1"
 export { Crypto1State } from "./state"
-export { prng_successor, crypto1_bit, crypto1_word } from "./crypto1"
\ No newline at end of file
+export { prng_successor, crypto1_bit, crypto1_byte, crypto1_word } from "./crypto1"
\ No newline at end of file