set 1 ex 3

exercises/set1/set_1.cpp

@@ -102,4 +102,12 @@ std::string XorHex(absl::string_view hex1, absl::string_view hex2) {
   return ConvertBytesToHex(result_bytes);
 }
 
+/*
+std::string ByteToAscii(absl::string_view hex) {
+  std::string result;
+  for (int i = 0; i < hex.size(); ++i) {
+    result.push_back
+  }
+}
+*/
 }  // namespace cryptopals

exercises/set1/set_1_test.cpp

@@ -38,4 +38,9 @@ TEST(Set1Test, Exercise2_FixedXor) {
             "746865206b696420646f6e277420706c6179");
 }
 
+TEST(Set1Test, Exercise2_SingleByteXorCipher) {
+  EXPECT_EQ(ConvertHexToBytes(XorHex("1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736",
+                                     "58585858585858585858585858585858585858585858585858585858585858585858")),
+            "Cooking MC's like a pound of bacon");
+}
 }  // namespace

exercises/set1/single_byte_xor_cipher.txt

@@ -0,0 +1,36 @@
+1b 37 37 33 31 36 3f 78 15 1b 7f 2b 78 34 31 33 3d 78 39 78 28 37 2d 36 3c 78 37 3e 78 3a 39 3b 37 36
+C  o  o  k  i  n  _     M  C  _  _     _  i  k  _     a     _  o  _  n  _     o  _     _  a  _  o  n
+
+space hex 20
+78 ^ 20 = 58
+36 ^ 58 = 6e
+
+15 ^ 58 = 4d M
+1b ^ 58 = 43 C
+78 ^ 58 = 20 space
+31 ^ 58 = 69 i 
+33 ^ 58 = 6b k
+36 ^ 58 = 6e n
+37 ^ 58 = 6f o
+39 ^ 58 = 61 a
+
+byte  freq  likely
+15    1
+1b    2
+28    1
+2b    1
+2d    1
+31    2
+33    2
+34    1
+36    3
+37    5		E,T,A,O,I,
+39    2
+3a    1
+3b    1
+3c    1
+3d    1
+3e    1
+3f    1
+78    6		E,T,A,O,I,N,S,R,H
+7f    1