1 files changed, 16 insertions, 0 deletions
diff --git a/users/wpcarro/scratch/cryptopals/set1/c5.py b/users/wpcarro/scratch/cryptopals/set1/c5.py
new file mode 100644
index 000000000000..a098dfe74afa
--- /dev/null
+++ b/users/wpcarro/scratch/cryptopals/set1/c5.py
@@ -0,0 +1,16 @@
+def encrypt_repeating_key(x, key):
+    result = b""
+    for i in range(len(x)):
+        b = ord(x[i]) ^ ord(key[i % len(key)])
+        result += b.to_bytes(1, 'big')
+    return result.hex()
+
+cleartext = "Burning 'em, if you ain't quick and nimble\nI go crazy when I hear a cymbal"
+expected = "0b3637272a2b2e63622c2e69692a23693a2a3c6324202d623d63343c2a26226324272765272a282b2f20430a652e2c652a3124333a653e2b2027630c692b20283165286326302e27282f"
+
+run_tests = False
+if run_tests:
+    ciphertext = encrypt_repeating_key(cleartext, "ICE")
+    print(ciphertext)
+    assert ciphertext == expected
+    print("Success!")