feat(wpcarro/scratch): Upload my solutions to cryptopals r/3501

More beginner problems/solutions for CTF-style challenges.

Change-Id: Ide229e99e3ccc1ede5a5ca1c2ad039498e49ea4c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4740
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI

6 files changed, 409 insertions, 0 deletions

diff --git a/users/wpcarro/scratch/cryptopals/README.md b/users/wpcarro/scratch/cryptopals/README.md
new file mode 100644
index 000000000000..f4f5719f9f6b
--- /dev/null
+++ b/users/wpcarro/scratch/cryptopals/README.md
@@ -0,0 +1,3 @@
+# cryptopals
+
+My solutions for some of the questions at https://cryptopals.com.
diff --git a/users/wpcarro/scratch/cryptopals/set1/4.txt b/users/wpcarro/scratch/cryptopals/set1/4.txt
new file mode 100644
index 000000000000..d172b6cff724
--- /dev/null
+++ b/users/wpcarro/scratch/cryptopals/set1/4.txt
@@ -0,0 +1,327 @@
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diff --git a/users/wpcarro/scratch/cryptopals/set1/c1.py b/users/wpcarro/scratch/cryptopals/set1/c1.py
new file mode 100644
index 000000000000..0dfd6bb6d059
--- /dev/null
+++ b/users/wpcarro/scratch/cryptopals/set1/c1.py
@@ -0,0 +1,19 @@
+from base64 import b64encode
+
+################################################################################
+# Challenge 1
+################################################################################
+
+def hex_to_base64(x):
+    parsed = bytearray.fromhex(x)
+    print(parsed.decode()) # easter egg
+    return b64encode(parsed).decode()
+
+run_tests = False
+if run_tests:
+    actual = hex_to_base64("49276d206b696c6c696e6720796f757220627261696e206c696b65206120706f69736f6e6f7573206d757368726f6f6d")
+    expect = "SSdtIGtpbGxpbmcgeW91ciBicmFpbiBsaWtlIGEgcG9pc29ub3VzIG11c2hyb29t"
+
+    print(actual)
+    assert actual == expect
+    print("Success!")
diff --git a/users/wpcarro/scratch/cryptopals/set1/c2.py b/users/wpcarro/scratch/cryptopals/set1/c2.py
new file mode 100644
index 000000000000..badd60503d90
--- /dev/null
+++ b/users/wpcarro/scratch/cryptopals/set1/c2.py
@@ -0,0 +1,20 @@
+def fixed_xor(x, y, decode_hex=True, encode_hex=True):
+    if decode_hex:
+        x = bytearray.fromhex(x)
+        y = bytearray.fromhex(y)
+
+    result = bytearray(len(x))
+
+    for i in range(len(x)):
+        result[i] = x[i] ^ y[i]
+
+    return result.hex() if encode_hex else result
+
+run_tests = False
+if run_tests:
+    actual = fixed_xor("1c0111001f010100061a024b53535009181c", "686974207468652062756c6c277320657965")
+    expect = "746865206b696420646f6e277420706c6179"
+
+    print(actual)
+    assert actual == expect
+    print("Success!")
diff --git a/users/wpcarro/scratch/cryptopals/set1/c3.py b/users/wpcarro/scratch/cryptopals/set1/c3.py
new file mode 100644
index 000000000000..187b58c1c70a
--- /dev/null
+++ b/users/wpcarro/scratch/cryptopals/set1/c3.py
@@ -0,0 +1,28 @@
+from c2 import fixed_xor
+from collections import Counter
+import string
+
+alphabet = string.ascii_lowercase + string.ascii_uppercase
+
+def score(bs):
+    chars = [b for b in bs if b in alphabet]
+    return sum(Counter(chars).values())
+
+def decode_cipher(x):
+    x = bytearray.fromhex(x)
+    num_bytes = len(x)
+
+    mx, result, key = 0, None, None
+    for c in alphabet:
+        mask = bytearray(bytes(c, 'ascii') * num_bytes)
+        y = fixed_xor(x, mask, decode_hex=False, encode_hex=False).decode('ascii')
+        test = score(y)
+        if test > mx:
+            result = y
+            mx = test
+            key = mask.decode('ascii')
+    return result
+
+run_tests = False
+if run_tests:
+    print(decode_cipher("1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736"))
diff --git a/users/wpcarro/scratch/cryptopals/set1/c4.py b/users/wpcarro/scratch/cryptopals/set1/c4.py
new file mode 100644
index 000000000000..6775d73ec8cd
--- /dev/null
+++ b/users/wpcarro/scratch/cryptopals/set1/c4.py
@@ -0,0 +1,12 @@
+import c3
+
+content = None
+with open('4.txt', 'r') as f:
+    c3.decode_cipher
+    content = f.read().splitlines()
+
+for line in content:
+    try:
+        print(c3.decode_cipher(line))
+    except:
+        continue