From 4cf86f2e53881e473d881072e55b21179e4dd593 Mon Sep 17 00:00:00 2001 From: William Carroll Date: Wed, 29 Dec 2021 12:11:42 -0400 Subject: feat(wpcarro/scratch): Upload my solutions to cryptopals More beginner problems/solutions for CTF-style challenges. Change-Id: Ide229e99e3ccc1ede5a5ca1c2ad039498e49ea4c Reviewed-on: https://cl.tvl.fyi/c/depot/+/4740 Reviewed-by: wpcarro Autosubmit: wpcarro Tested-by: BuildkiteCI --- users/wpcarro/scratch/cryptopals/README.md | 3 + users/wpcarro/scratch/cryptopals/set1/4.txt | 327 ++++++++++++++++++++++++++++ users/wpcarro/scratch/cryptopals/set1/c1.py | 19 ++ users/wpcarro/scratch/cryptopals/set1/c2.py | 20 ++ users/wpcarro/scratch/cryptopals/set1/c3.py | 28 +++ users/wpcarro/scratch/cryptopals/set1/c4.py | 12 + 6 files changed, 409 insertions(+) create mode 100644 users/wpcarro/scratch/cryptopals/README.md create mode 100644 users/wpcarro/scratch/cryptopals/set1/4.txt create mode 100644 users/wpcarro/scratch/cryptopals/set1/c1.py create mode 100644 users/wpcarro/scratch/cryptopals/set1/c2.py create mode 100644 users/wpcarro/scratch/cryptopals/set1/c3.py create mode 100644 users/wpcarro/scratch/cryptopals/set1/c4.py (limited to 'users/wpcarro/scratch') 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 @@ +0e3647e8592d35514a081243582536ed3de6734059001e3f535ce6271032 +334b041de124f73c18011a50e608097ac308ecee501337ec3e100854201d +40e127f51c10031d0133590b1e490f3514e05a54143d08222c2a4071e351 +45440b171d5c1b21342e021c3a0eee7373215c4024f0eb733cf006e2040c +22015e420b07ef21164d5935e82338452f42282c1836e42536284c450de3 +043b452e0268e7eb005a080b360f0642e6e342005217ef04a42f3e43113d +581e0829214202063d70030845e5301f5a5212ed0818e22f120b211b171b 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newline at end of file 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 -- cgit 1.4.1