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Ruby implementation of the Arcfour Cipher
# Ruby implementation of the Alleged RC4 Cipher
class ArcFourCipher
def initialize(key)
@s = (0..255).to_a
s2 = []
key_arr = key.bytes.to_a
0.upto(255) do |i|
s2 << key_arr[i % key.bytesize]
end
j = 0
0.upto(255) do |i|
j = (j + @s[i] + s2[i]) % 256
tmp = @s[i]
@s[i] = @s[j]
@s[j] = tmp
end
s2 = nil
@i = @j = 0
end
def get_byte
@i = (@i + 1) % 256
@j = (@j + @s[@i]) % 256
tmp = @s[@i]
@s[@i] = @s[@j]
@s[@j] = tmp
t = (@s[@i] + @s[@j]) % 256
return @s[t]
end
def crypt(str)
result = ''
str.bytes.each do |b|
result << (b ^ self.get_byte)
end
return result
end
end
# encoding: ASCII-8BIT
require 'minitest/autorun'
require_relative 'arc_four_cipher'
# Test vectors from RFC6229
TEST_VECTORS = {
"0102030405" => [
[ 0, "b2 39 63 05 f0 3d c0 27 cc c3 52 4a 0a 11 18 a8"],
[ 16, "69 82 94 4f 18 fc 82 d5 89 c4 03 a4 7a 0d 09 19"],
[ 240, "28 cb 11 32 c9 6c e2 86 42 1d ca ad b8 b6 9e ae"],
[ 256, "1c fc f6 2b 03 ed db 64 1d 77 df cf 7f 8d 8c 93"],
[ 496, "42 b7 d0 cd d9 18 a8 a3 3d d5 17 81 c8 1f 40 41"],
[ 512, "64 59 84 44 32 a7 da 92 3c fb 3e b4 98 06 61 f6"],
[ 752, "ec 10 32 7b de 2b ee fd 18 f9 27 76 80 45 7e 22"],
[ 768, "eb 62 63 8d 4f 0b a1 fe 9f ca 20 e0 5b f8 ff 2b"],
[1008, "45 12 90 48 e6 a0 ed 0b 56 b4 90 33 8f 07 8d a5"],
[1024, "30 ab bc c7 c2 0b 01 60 9f 23 ee 2d 5f 6b b7 df"],
[1520, "32 94 f7 44 d8 f9 79 05 07 e7 0f 62 e5 bb ce ea"],
[1536, "d8 72 9d b4 18 82 25 9b ee 4f 82 53 25 f5 a1 30"],
[2032, "1e b1 4a 0c 13 b3 bf 47 fa 2a 0b a9 3a d4 5b 8b"],
[2048, "cc 58 2f 8b a9 f2 65 e2 b1 be 91 12 e9 75 d2 d7"],
[3056, "f2 e3 0f 9b d1 02 ec bf 75 aa ad e9 bc 35 c4 3c"],
[3072, "ec 0e 11 c4 79 dc 32 9d c8 da 79 68 fe 96 56 81"],
[4080, "06 83 26 a2 11 84 16 d2 1f 9d 04 b2 cd 1c a0 50"],
[4096, "ff 25 b5 89 95 99 67 07 e5 1f bd f0 8b 34 d8 75"]],
"01020304050607" => [
[ 0, "29 3f 02 d4 7f 37 c9 b6 33 f2 af 52 85 fe b4 6b"],
[ 16, "e6 20 f1 39 0d 19 bd 84 e2 e0 fd 75 20 31 af c1"],
[ 240, "91 4f 02 53 1c 92 18 81 0d f6 0f 67 e3 38 15 4c"],
[ 256, "d0 fd b5 83 07 3c e8 5a b8 39 17 74 0e c0 11 d5"],
[ 496, "75 f8 14 11 e8 71 cf fa 70 b9 0c 74 c5 92 e4 54"],
[ 512, "0b b8 72 02 93 8d ad 60 9e 87 a5 a1 b0 79 e5 e4"],
[ 752, "c2 91 12 46 b6 12 e7 e7 b9 03 df ed a1 da d8 66"],
[ 768, "32 82 8f 91 50 2b 62 91 36 8d e8 08 1d e3 6f c2"],
[1008, "f3 b9 a7 e3 b2 97 bf 9a d8 04 51 2f 90 63 ef f1"],
[1024, "8e cb 67 a9 ba 1f 55 a5 a0 67 e2 b0 26 a3 67 6f"],
[1520, "d2 aa 90 2b d4 2d 0d 7c fd 34 0c d4 58 10 52 9f"],
[1536, "78 b2 72 c9 6e 42 ea b4 c6 0b d9 14 e3 9d 06 e3"],
[2032, "f4 33 2f d3 1a 07 93 96 ee 3c ee 3f 2a 4f f0 49"],
[2048, "05 45 97 81 d4 1f da 7f 30 c1 be 7e 12 46 c6 23"],
[3056, "ad fd 38 68 b8 e5 14 85 d5 e6 10 01 7e 3d d6 09"],
[3072, "ad 26 58 1c 0c 5b e4 5f 4c ea 01 db 2f 38 05 d5"],
[4080, "f3 17 2c ef fc 3b 3d 99 7c 85 cc d5 af 1a 95 0c"],
[4096, "e7 4b 0b 97 31 22 7f d3 7c 0e c0 8a 47 dd d8 b8"]],
"0102030405060708" => [
[ 0, "97 ab 8a 1b f0 af b9 61 32 f2 f6 72 58 da 15 a8"],
[ 16, "82 63 ef db 45 c4 a1 86 84 ef 87 e6 b1 9e 5b 09"],
[ 240, "96 36 eb c9 84 19 26 f4 f7 d1 f3 62 bd df 6e 18"],
[ 256, "d0 a9 90 ff 2c 05 fe f5 b9 03 73 c9 ff 4b 87 0a"],
[ 496, "73 23 9f 1d b7 f4 1d 80 b6 43 c0 c5 25 18 ec 63"],
[ 512, "16 3b 31 99 23 a6 bd b4 52 7c 62 61 26 70 3c 0f"],
[ 752, "49 d6 c8 af 0f 97 14 4a 87 df 21 d9 14 72 f9 66"],
[ 768, "44 17 3a 10 3b 66 16 c5 d5 ad 1c ee 40 c8 63 d0"],
[1008, "27 3c 9c 4b 27 f3 22 e4 e7 16 ef 53 a4 7d e7 a4"],
[1024, "c6 d0 e7 b2 26 25 9f a9 02 34 90 b2 61 67 ad 1d"],
[1520, "1f e8 98 67 13 f0 7c 3d 9a e1 c1 63 ff 8c f9 d3"],
[1536, "83 69 e1 a9 65 61 0b e8 87 fb d0 c7 91 62 aa fb"],
[2032, "0a 01 27 ab b4 44 84 b9 fb ef 5a bc ae 1b 57 9f"],
[2048, "c2 cd ad c6 40 2e 8e e8 66 e1 f3 7b db 47 e4 2c"],
[3056, "26 b5 1e a3 7d f8 e1 d6 f7 6f c3 b6 6a 74 29 b3"],
[3072, "bc 76 83 20 5d 4f 44 3d c1 f2 9d da 33 15 c8 7b"],
[4080, "d5 fa 5a 34 69 d2 9a aa f8 3d 23 58 9d b8 c8 5b"],
[4096, "3f b4 6e 2c 8f 0f 06 8e dc e8 cd cd 7d fc 58 62"]],
"0102030405060708090a" => [
[ 0, "ed e3 b0 46 43 e5 86 cc 90 7d c2 18 51 70 99 02"],
[ 16, "03 51 6b a7 8f 41 3b eb 22 3a a5 d4 d2 df 67 11"],
[ 240, "3c fd 6c b5 8e e0 fd de 64 01 76 ad 00 00 04 4d"],
[ 256, "48 53 2b 21 fb 60 79 c9 11 4c 0f fd 9c 04 a1 ad"],
[ 496, "3e 8c ea 98 01 71 09 97 90 84 b1 ef 92 f9 9d 86"],
[ 512, "e2 0f b4 9b db 33 7e e4 8b 8d 8d c0 f4 af ef fe"],
[ 752, "5c 25 21 ea cd 79 66 f1 5e 05 65 44 be a0 d3 15"],
[ 768, "e0 67 a7 03 19 31 a2 46 a6 c3 87 5d 2f 67 8a cb"],
[1008, "a6 4f 70 af 88 ae 56 b6 f8 75 81 c0 e2 3e 6b 08"],
[1024, "f4 49 03 1d e3 12 81 4e c6 f3 19 29 1f 4a 05 16"],
[1520, "bd ae 85 92 4b 3c b1 d0 a2 e3 3a 30 c6 d7 95 99"],
[1536, "8a 0f ed db ac 86 5a 09 bc d1 27 fb 56 2e d6 0a"],
[2032, "b5 5a 0a 5b 51 a1 2a 8b e3 48 99 c3 e0 47 51 1a"],
[2048, "d9 a0 9c ea 3c e7 5f e3 96 98 07 03 17 a7 13 39"],
[3056, "55 22 25 ed 11 77 f4 45 84 ac 8c fa 6c 4e b5 fc"],
[3072, "7e 82 cb ab fc 95 38 1b 08 09 98 44 21 29 c2 f8"],
[4080, "1f 13 5e d1 4c e6 0a 91 36 9d 23 22 be f2 5e 3c"],
[4096, "08 b6 be 45 12 4a 43 e2 eb 77 95 3f 84 dc 85 53"]],
"0102030405060708090a0b0c0d0e0f10" => [
[ 0, "9a c7 cc 9a 60 9d 1e f7 b2 93 28 99 cd e4 1b 97"],
[ 16, "52 48 c4 95 90 14 12 6a 6e 8a 84 f1 1d 1a 9e 1c"],
[ 240, "06 59 02 e4 b6 20 f6 cc 36 c8 58 9f 66 43 2f 2b"],
[ 256, "d3 9d 56 6b c6 bc e3 01 07 68 15 15 49 f3 87 3f"],
[ 496, "b6 d1 e6 c4 a5 e4 77 1c ad 79 53 8d f2 95 fb 11"],
[ 512, "c6 8c 1d 5c 55 9a 97 41 23 df 1d bc 52 a4 3b 89"],
[ 752, "c5 ec f8 8d e8 97 fd 57 fe d3 01 70 1b 82 a2 59"],
[ 768, "ec cb e1 3d e1 fc c9 1c 11 a0 b2 6c 0b c8 fa 4d"],
[1008, "e7 a7 25 74 f8 78 2a e2 6a ab cf 9e bc d6 60 65"],
[1024, "bd f0 32 4e 60 83 dc c6 d3 ce dd 3c a8 c5 3c 16"],
[1520, "b4 01 10 c4 19 0b 56 22 a9 61 16 b0 01 7e d2 97"],
[1536, "ff a0 b5 14 64 7e c0 4f 63 06 b8 92 ae 66 11 81"],
[2032, "d0 3d 1b c0 3c d3 3d 70 df f9 fa 5d 71 96 3e bd"],
[2048, "8a 44 12 64 11 ea a7 8b d5 1e 8d 87 a8 87 9b f5"],
[3056, "fa be b7 60 28 ad e2 d0 e4 87 22 e4 6c 46 15 a3"],
[3072, "c0 5d 88 ab d5 03 57 f9 35 a6 3c 59 ee 53 76 23"],
[4080, "ff 38 26 5c 16 42 c1 ab e8 d3 c2 fe 5e 57 2b f8"],
[4096, "a3 6a 4c 30 1a e8 ac 13 61 0c cb c1 22 56 ca cc"]],
"0102030405060708090a0b0c0d0e0f101112131415161718" => [
[ 0, "05 95 e5 7f e5 f0 bb 3c 70 6e da c8 a4 b2 db 11"],
[ 16, "df de 31 34 4a 1a f7 69 c7 4f 07 0a ee 9e 23 26"],
[ 240, "b0 6b 9b 1e 19 5d 13 d8 f4 a7 99 5c 45 53 ac 05"],
[ 256, "6b d2 37 8e c3 41 c9 a4 2f 37 ba 79 f8 8a 32 ff"],
[ 496, "e7 0b ce 1d f7 64 5a db 5d 2c 41 30 21 5c 35 22"],
[ 512, "9a 57 30 c7 fc b4 c9 af 51 ff da 89 c7 f1 ad 22"],
[ 752, "04 85 05 5f d4 f6 f0 d9 63 ef 5a b9 a5 47 69 82"],
[ 768, "59 1f c6 6b cd a1 0e 45 2b 03 d4 55 1f 6b 62 ac"],
[1008, "27 53 cc 83 98 8a fa 3e 16 88 a1 d3 b4 2c 9a 02"],
[1024, "93 61 0d 52 3d 1d 3f 00 62 b3 c2 a3 bb c7 c7 f0"],
[1520, "96 c2 48 61 0a ad ed fe af 89 78 c0 3d e8 20 5a"],
[1536, "0e 31 7b 3d 1c 73 b9 e9 a4 68 8f 29 6d 13 3a 19"],
[2032, "bd f0 e6 c3 cc a5 b5 b9 d5 33 b6 9c 56 ad a1 20"],
[2048, "88 a2 18 b6 e2 ec e1 e6 24 6d 44 c7 59 d1 9b 10"],
[3056, "68 66 39 7e 95 c1 40 53 4f 94 26 34 21 00 6e 40"],
[3072, "32 cb 0a 1e 95 42 c6 b3 b8 b3 98 ab c3 b0 f1 d5"],
[4080, "29 a0 b8 ae d5 4a 13 23 24 c6 2e 42 3f 54 b4 c8"],
[4096, "3c b0 f3 b5 02 0a 98 b8 2a f9 fe 15 44 84 a1 68"]],
"0102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20" => [
[ 0, "ea a6 bd 25 88 0b f9 3d 3f 5d 1e 4c a2 61 1d 91"],
[ 16, "cf a4 5c 9f 7e 71 4b 54 bd fa 80 02 7c b1 43 80"],
[ 240, "11 4a e3 44 de d7 1b 35 f2 e6 0f eb ad 72 7f d8"],
[ 256, "02 e1 e7 05 6b 0f 62 39 00 49 64 22 94 3e 97 b6"],
[ 496, "91 cb 93 c7 87 96 4e 10 d9 52 7d 99 9c 6f 93 6b"],
[ 512, "49 b1 8b 42 f8 e8 36 7c be b5 ef 10 4b a1 c7 cd"],
[ 752, "87 08 4b 3b a7 00 ba de 95 56 10 67 27 45 b3 74"],
[ 768, "e7 a7 b9 e9 ec 54 0d 5f f4 3b db 12 79 2d 1b 35"],
[1008, "c7 99 b5 96 73 8f 6b 01 8c 76 c7 4b 17 59 bd 90"],
[1024, "7f ec 5b fd 9f 9b 89 ce 65 48 30 90 92 d7 e9 58"],
[1520, "40 f2 50 b2 6d 1f 09 6a 4a fd 4c 34 0a 58 88 15"],
[1536, "3e 34 13 5c 79 db 01 02 00 76 76 51 cf 26 30 73"],
[2032, "f6 56 ab cc f8 8d d8 27 02 7b 2c e9 17 d4 64 ec"],
[2048, "18 b6 25 03 bf bc 07 7f ba bb 98 f2 0d 98 ab 34"],
[3056, "8a ed 95 ee 5b 0d cb fb ef 4e b2 1d 3a 3f 52 f9"],
[3072, "62 5a 1a b0 0e e3 9a 53 27 34 6b dd b0 1a 9c 18"],
[4080, "a1 3a 7c 79 c7 e1 19 b5 ab 02 96 ab 28 c3 00 b9"],
[4096, "f3 e4 c0 a2 e0 2d 1d 01 f7 f0 a7 46 18 af 2b 48"]],
"833222772a" => [
[ 0, "80 ad 97 bd c9 73 df 8a 2e 87 9e 92 a4 97 ef da"],
[ 16, "20 f0 60 c2 f2 e5 12 65 01 d3 d4 fe a1 0d 5f c0"],
[ 240, "fa a1 48 e9 90 46 18 1f ec 6b 20 85 f3 b2 0e d9"],
[ 256, "f0 da f5 ba b3 d5 96 83 98 57 84 6f 73 fb fe 5a"],
[ 496, "1c 7e 2f c4 63 92 32 fe 29 75 84 b2 96 99 6b c8"],
[ 512, "3d b9 b2 49 40 6c c8 ed ff ac 55 cc d3 22 ba 12"],
[ 752, "e4 f9 f7 e0 06 61 54 bb d1 25 b7 45 56 9b c8 97"],
[ 768, "75 d5 ef 26 2b 44 c4 1a 9c f6 3a e1 45 68 e1 b9"],
[1008, "6d a4 53 db f8 1e 82 33 4a 3d 88 66 cb 50 a1 e3"],
[1024, "78 28 d0 74 11 9c ab 5c 22 b2 94 d7 a9 bf a0 bb"],
[1520, "ad b8 9c ea 9a 15 fb e6 17 29 5b d0 4b 8c a0 5c"],
[1536, "62 51 d8 7f d4 aa ae 9a 7e 4a d5 c2 17 d3 f3 00"],
[2032, "e7 11 9b d6 dd 9b 22 af e8 f8 95 85 43 28 81 e2"],
[2048, "78 5b 60 fd 7e c4 e9 fc b6 54 5f 35 0d 66 0f ab"],
[3056, "af ec c0 37 fd b7 b0 83 8e b3 d7 0b cd 26 83 82"],
[3072, "db c1 a7 b4 9d 57 35 8c c9 fa 6d 61 d7 3b 7c f0"],
[4080, "63 49 d1 26 a3 7a fc ba 89 79 4f 98 04 91 4f dc"],
[4096, "bf 42 c3 01 8c 2f 7c 66 bf de 52 49 75 76 81 15"]],
"1910833222772a" => [
[ 0, "bc 92 22 db d3 27 4d 8f c6 6d 14 cc bd a6 69 0b"],
[ 16, "7a e6 27 41 0c 9a 2b e6 93 df 5b b7 48 5a 63 e3"],
[ 240, "3f 09 31 aa 03 de fb 30 0f 06 01 03 82 6f 2a 64"],
[ 256, "be aa 9e c8 d5 9b b6 81 29 f3 02 7c 96 36 11 81"],
[ 496, "74 e0 4d b4 6d 28 64 8d 7d ee 8a 00 64 b0 6c fe"],
[ 512, "9b 5e 81 c6 2f e0 23 c5 5b e4 2f 87 bb f9 32 b8"],
[ 752, "ce 17 8f c1 82 6e fe cb c1 82 f5 79 99 a4 61 40"],
[ 768, "8b df 55 cd 55 06 1c 06 db a6 be 11 de 4a 57 8a"],
[1008, "62 6f 5f 4d ce 65 25 01 f3 08 7d 39 c9 2c c3 49"],
[1024, "42 da ac 6a 8f 9a b9 a7 fd 13 7c 60 37 82 56 82"],
[1520, "cc 03 fd b7 91 92 a2 07 31 2f 53 f5 d4 dc 33 d9"],
[1536, "f7 0f 14 12 2a 1c 98 a3 15 5d 28 b8 a0 a8 a4 1d"],
[2032, "2a 3a 30 7a b2 70 8a 9c 00 fe 0b 42 f9 c2 d6 a1"],
[2048, "86 26 17 62 7d 22 61 ea b0 b1 24 65 97 ca 0a e9"],
[3056, "55 f8 77 ce 4f 2e 1d db bf 8e 13 e2 cd e0 fd c8"],
[3072, "1b 15 56 cb 93 5f 17 33 37 70 5f bb 5d 50 1f c1"],
[4080, "ec d0 e9 66 02 be 7f 8d 50 92 81 6c cc f2 c2 e9"],
[4096, "02 78 81 fa b4 99 3a 1c 26 20 24 a9 4f ff 3f 61"]],
"641910833222772a" => [
[ 0, "bb f6 09 de 94 13 17 2d 07 66 0c b6 80 71 69 26"],
[ 16, "46 10 1a 6d ab 43 11 5d 6c 52 2b 4f e9 36 04 a9"],
[ 240, "cb e1 ff f2 1c 96 f3 ee f6 1e 8f e0 54 2c bd f0"],
[ 256, "34 79 38 bf fa 40 09 c5 12 cf b4 03 4b 0d d1 a7"],
[ 496, "78 67 a7 86 d0 0a 71 47 90 4d 76 dd f1 e5 20 e3"],
[ 512, "8d 3e 9e 1c ae fc cc b3 fb f8 d1 8f 64 12 0b 32"],
[ 752, "94 23 37 f8 fd 76 f0 fa e8 c5 2d 79 54 81 06 72"],
[ 768, "b8 54 8c 10 f5 16 67 f6 e6 0e 18 2f a1 9b 30 f7"],
[1008, "02 11 c7 c6 19 0c 9e fd 12 37 c3 4c 8f 2e 06 c4"],
[1024, "bd a6 4f 65 27 6d 2a ac b8 f9 02 12 20 3a 80 8e"],
[1520, "bd 38 20 f7 32 ff b5 3e c1 93 e7 9d 33 e2 7c 73"],
[1536, "d0 16 86 16 86 19 07 d4 82 e3 6c da c8 cf 57 49"],
[2032, "97 b0 f0 f2 24 b2 d2 31 71 14 80 8f b0 3a f7 a0"],
[2048, "e5 96 16 e4 69 78 79 39 a0 63 ce ea 9a f9 56 d1"],
[3056, "c4 7e 0d c1 66 09 19 c1 11 01 20 8f 9e 69 aa 1f"],
[3072, "5a e4 f1 28 96 b8 37 9a 2a ad 89 b5 b5 53 d6 b0"],
[4080, "6b 6b 09 8d 0c 29 3b c2 99 3d 80 bf 05 18 b6 d9"],
[4096, "81 70 cc 3c cd 92 a6 98 62 1b 93 9d d3 8f e7 b9"]],
"8b37641910833222772a" => [
[ 0, "ab 65 c2 6e dd b2 87 60 0d b2 fd a1 0d 1e 60 5c"],
[ 16, "bb 75 90 10 c2 96 58 f2 c7 2d 93 a2 d1 6d 29 30"],
[ 240, "b9 01 e8 03 6e d1 c3 83 cd 3c 4c 4d d0 a6 ab 05"],
[ 256, "3d 25 ce 49 22 92 4c 55 f0 64 94 33 53 d7 8a 6c"],
[ 496, "12 c1 aa 44 bb f8 7e 75 e6 11 f6 9b 2c 38 f4 9b"],
[ 512, "28 f2 b3 43 4b 65 c0 98 77 47 00 44 c6 ea 17 0d"],
[ 752, "bd 9e f8 22 de 52 88 19 61 34 cf 8a f7 83 93 04"],
[ 768, "67 55 9c 23 f0 52 15 84 70 a2 96 f7 25 73 5a 32"],
[1008, "8b ab 26 fb c2 c1 2b 0f 13 e2 ab 18 5e ab f2 41"],
[1024, "31 18 5a 6d 69 6f 0c fa 9b 42 80 8b 38 e1 32 a2"],
[1520, "56 4d 3d ae 18 3c 52 34 c8 af 1e 51 06 1c 44 b5"],
[1536, "3c 07 78 a7 b5 f7 2d 3c 23 a3 13 5c 7d 67 b9 f4"],
[2032, "f3 43 69 89 0f cf 16 fb 51 7d ca ae 44 63 b2 dd"],
[2048, "02 f3 1c 81 e8 20 07 31 b8 99 b0 28 e7 91 bf a7"],
[3056, "72 da 64 62 83 22 8c 14 30 08 53 70 17 95 61 6f"],
[3072, "4e 0a 8c 6f 79 34 a7 88 e2 26 5e 81 d6 d0 c8 f4"],
[4080, "43 8d d5 ea fe a0 11 1b 6f 36 b4 b9 38 da 2a 68"],
[4096, "5f 6b fc 73 81 58 74 d9 71 00 f0 86 97 93 57 d8"]],
"ebb46227c6cc8b37641910833222772a" => [
[ 0, "72 0c 94 b6 3e df 44 e1 31 d9 50 ca 21 1a 5a 30"],
[ 16, "c3 66 fd ea cf 9c a8 04 36 be 7c 35 84 24 d2 0b"],
[ 240, "b3 39 4a 40 aa bf 75 cb a4 22 82 ef 25 a0 05 9f"],
[ 256, "48 47 d8 1d a4 94 2d bc 24 9d ef c4 8c 92 2b 9f"],
[ 496, "08 12 8c 46 9f 27 53 42 ad da 20 2b 2b 58 da 95"],
[ 512, "97 0d ac ef 40 ad 98 72 3b ac 5d 69 55 b8 17 61"],
[ 752, "3c b8 99 93 b0 7b 0c ed 93 de 13 d2 a1 10 13 ac"],
[ 768, "ef 2d 67 6f 15 45 c2 c1 3d c6 80 a0 2f 4a db fe"],
[1008, "b6 05 95 51 4f 24 bc 9f e5 22 a6 ca d7 39 36 44"],
[1024, "b5 15 a8 c5 01 17 54 f5 90 03 05 8b db 81 51 4e"],
[1520, "3c 70 04 7e 8c bc 03 8e 3b 98 20 db 60 1d a4 95"],
[1536, "11 75 da 6e e7 56 de 46 a5 3e 2b 07 56 60 b7 70"],
[2032, "00 a5 42 bb a0 21 11 cc 2c 65 b3 8e bd ba 58 7e"],
[2048, "58 65 fd bb 5b 48 06 41 04 e8 30 b3 80 f2 ae de"],
[3056, "34 b2 1a d2 ad 44 e9 99 db 2d 7f 08 63 f0 d9 b6"],
[3072, "84 a9 21 8f c3 6e 8a 5f 2c cf be ae 53 a2 7d 25"],
[4080, "a2 22 1a 11 b8 33 cc b4 98 a5 95 40 f0 54 5f 4a"],
[4096, "5b be b4 78 7d 59 e5 37 3f db ea 6c 6f 75 c2 9b"]],
"c109163908ebe51debb46227c6cc8b37641910833222772a" => [
[ 0, "54 b6 4e 6b 5a 20 b5 e2 ec 84 59 3d c7 98 9d a7"],
[ 16, "c1 35 ee e2 37 a8 54 65 ff 97 dc 03 92 4f 45 ce"],
[ 240, "cf cc 92 2f b4 a1 4a b4 5d 61 75 aa bb f2 d2 01"],
[ 256, "83 7b 87 e2 a4 46 ad 0e f7 98 ac d0 2b 94 12 4f"],
[ 496, "17 a6 db d6 64 92 6a 06 36 b3 f4 c3 7a 4f 46 94"],
[ 512, "4a 5f 9f 26 ae ee d4 d4 a2 5f 63 2d 30 52 33 d9"],
[ 752, "80 a3 d0 1e f0 0c 8e 9a 42 09 c1 7f 4e eb 35 8c"],
[ 768, "d1 5e 7d 5f fa aa bc 02 07 bf 20 0a 11 77 93 a2"],
[1008, "34 96 82 bf 58 8e aa 52 d0 aa 15 60 34 6a ea fa"],
[1024, "f5 85 4c db 76 c8 89 e3 ad 63 35 4e 5f 72 75 e3"],
[1520, "53 2c 7c ec cb 39 df 32 36 31 84 05 a4 b1 27 9c"],
[1536, "ba ef e6 d9 ce b6 51 84 22 60 e0 d1 e0 5e 3b 90"],
[2032, "e8 2d 8c 6d b5 4e 3c 63 3f 58 1c 95 2b a0 42 07"],
[2048, "4b 16 e5 0a bd 38 1b d7 09 00 a9 cd 9a 62 cb 23"],
[3056, "36 82 ee 33 bd 14 8b d9 f5 86 56 cd 8f 30 d9 fb"],
[3072, "1e 5a 0b 84 75 04 5d 9b 20 b2 62 86 24 ed fd 9e"],
[4080, "63 ed d6 84 fb 82 62 82 fe 52 8f 9c 0e 92 37 bc"],
[4096, "e4 dd 2e 98 d6 96 0f ae 0b 43 54 54 56 74 33 91"]],
"1ada31d5cf688221c109163908ebe51debb46227c6cc8b37641910833222772a" => [
[ 0, "dd 5b cb 00 18 e9 22 d4 94 75 9d 7c 39 5d 02 d3"],
[ 16, "c8 44 6f 8f 77 ab f7 37 68 53 53 eb 89 a1 c9 eb"],
[ 240, "af 3e 30 f9 c0 95 04 59 38 15 15 75 c3 fb 90 98"],
[ 256, "f8 cb 62 74 db 99 b8 0b 1d 20 12 a9 8e d4 8f 0e"],
[ 496, "25 c3 00 5a 1c b8 5d e0 76 25 98 39 ab 71 98 ab"],
[ 512, "9d cb c1 83 e8 cb 99 4b 72 7b 75 be 31 80 76 9c"],
[ 752, "a1 d3 07 8d fa 91 69 50 3e d9 d4 49 1d ee 4e b2"],
[ 768, "85 14 a5 49 58 58 09 6f 59 6e 4b cd 66 b1 06 65"],
[1008, "5f 40 d5 9e c1 b0 3b 33 73 8e fa 60 b2 25 5d 31"],
[1024, "34 77 c7 f7 64 a4 1b ac ef f9 0b f1 4f 92 b7 cc"],
[1520, "ac 4e 95 36 8d 99 b9 eb 78 b8 da 8f 81 ff a7 95"],
[1536, "8c 3c 13 f8 c2 38 8b b7 3f 38 57 6e 65 b7 c4 46"],
[2032, "13 c4 b9 c1 df b6 65 79 ed dd 8a 28 0b 9f 73 16"],
[2048, "dd d2 78 20 55 01 26 69 8e fa ad c6 4b 64 f6 6e"],
[3056, "f0 8f 2e 66 d2 8e d1 43 f3 a2 37 cf 9d e7 35 59"],
[3072, "9e a3 6c 52 55 31 b8 80 ba 12 43 34 f5 7b 0b 70"],
[4080, "d5 a3 9e 3d fc c5 02 80 ba c4 a6 b5 aa 0d ca 7d"],
[4096, "37 0b 1c 1f e6 55 91 6d 97 fd 0d 47 ca 1d 72 b8"]]
}
# Helper function to convert from hex encoding to actual bytes
def hexdecode(str)
bytes = []
clean_str = str.tr(' ', '')
n = clean_str.hex
(clean_str.length / 2).times do
bytes << (n & 0xff)
n >>= 8
end
str = ""
until bytes.empty?
str << bytes.pop
end
str
end
class TestArcFourCipher < MiniTest::Unit::TestCase
def test_rfc6229_vectors
TEST_VECTORS.each_key do |key|
# Convert from hex encoding to actual bytes
bkey = hexdecode(key)
# Generate the keystream
rc4 = ArcFourCipher.new(bkey)
ks = ""
4112.times do
ks << rc4.get_byte
end
TEST_VECTORS[key].each do |offset, expected|
assert_equal(ks[offset, 16], hexdecode(expected))
end
end
end
end
require_relative 'arc_four_cipher'
WIKIPEDIA_EXAMPLES = [
["Key", "Plaintext"],
["Wiki", "pedia"],
["Secret", "Attack at dawn"]
]
WIKIPEDIA_EXAMPLES.each do |key, plaintext|
rc4ks = ArcFourCipher.new(key)
rc4crypt = ArcFourCipher.new(key)
ks = []
16.times { ks << rc4ks.get_byte.to_s(16).rjust(2, '0') }
ct = rc4crypt.crypt(plaintext)
puts "Key: #{key.dump}"
puts "Keystream: #{ks.join}"
puts "Plaintext: #{plaintext.dump}"
puts "Ciphertext: #{ct.bytes.map { |x| x.to_s(16).rjust(2, '0') }.join}"
puts
end
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