diff options
Diffstat (limited to 'challenge')
| -rw-r--r-- | challenge/c20.go | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/challenge/c20.go b/challenge/c20.go new file mode 100644 index 0000000..337e958 --- /dev/null +++ b/challenge/c20.go @@ -0,0 +1,207 @@ +// Copyright © 2021 rsiddharth <s@ricketyspace.net> +// SPDX-License-Identifier: ISC + +package challenge + +import ( + "fmt" + + "ricketyspace.net/cryptopals/lib" +) + +func C20() { + texts := []string{ + "SSdtIHJhdGVkICJSIi4uLnRoaXMgaXMgYSB3YXJuaW5nLCB5YSBiZXR0ZXIgdm9pZCAvIFBvZXRzIGFyZSBwYXJhbm9pZCwgREoncyBELXN0cm95ZWQ=", + "Q3V6IEkgY2FtZSBiYWNrIHRvIGF0dGFjayBvdGhlcnMgaW4gc3BpdGUtIC8gU3RyaWtlIGxpa2UgbGlnaHRuaW4nLCBJdCdzIHF1aXRlIGZyaWdodGVuaW4nIQ==", + "QnV0IGRvbid0IGJlIGFmcmFpZCBpbiB0aGUgZGFyaywgaW4gYSBwYXJrIC8gTm90IGEgc2NyZWFtIG9yIGEgY3J5LCBvciBhIGJhcmssIG1vcmUgbGlrZSBhIHNwYXJrOw==", + "WWEgdHJlbWJsZSBsaWtlIGEgYWxjb2hvbGljLCBtdXNjbGVzIHRpZ2h0ZW4gdXAgLyBXaGF0J3MgdGhhdCwgbGlnaHRlbiB1cCEgWW91IHNlZSBhIHNpZ2h0IGJ1dA==", + "U3VkZGVubHkgeW91IGZlZWwgbGlrZSB5b3VyIGluIGEgaG9ycm9yIGZsaWNrIC8gWW91IGdyYWIgeW91ciBoZWFydCB0aGVuIHdpc2ggZm9yIHRvbW9ycm93IHF1aWNrIQ==", + "TXVzaWMncyB0aGUgY2x1ZSwgd2hlbiBJIGNvbWUgeW91ciB3YXJuZWQgLyBBcG9jYWx5cHNlIE5vdywgd2hlbiBJJ20gZG9uZSwgeWEgZ29uZSE=", + "SGF2ZW4ndCB5b3UgZXZlciBoZWFyZCBvZiBhIE1DLW11cmRlcmVyPyAvIFRoaXMgaXMgdGhlIGRlYXRoIHBlbmFsdHksYW5kIEknbSBzZXJ2aW4nIGE=", + "RGVhdGggd2lzaCwgc28gY29tZSBvbiwgc3RlcCB0byB0aGlzIC8gSHlzdGVyaWNhbCBpZGVhIGZvciBhIGx5cmljYWwgcHJvZmVzc2lvbmlzdCE=", + "RnJpZGF5IHRoZSB0aGlydGVlbnRoLCB3YWxraW5nIGRvd24gRWxtIFN0cmVldCAvIFlvdSBjb21lIGluIG15IHJlYWxtIHlhIGdldCBiZWF0IQ==", + "VGhpcyBpcyBvZmYgbGltaXRzLCBzbyB5b3VyIHZpc2lvbnMgYXJlIGJsdXJyeSAvIEFsbCB5YSBzZWUgaXMgdGhlIG1ldGVycyBhdCBhIHZvbHVtZQ==", + "VGVycm9yIGluIHRoZSBzdHlsZXMsIG5ldmVyIGVycm9yLWZpbGVzIC8gSW5kZWVkIEknbSBrbm93bi15b3VyIGV4aWxlZCE=", + "Rm9yIHRob3NlIHRoYXQgb3Bwb3NlIHRvIGJlIGxldmVsIG9yIG5leHQgdG8gdGhpcyAvIEkgYWluJ3QgYSBkZXZpbCBhbmQgdGhpcyBhaW4ndCB0aGUgRXhvcmNpc3Qh", + "V29yc2UgdGhhbiBhIG5pZ2h0bWFyZSwgeW91IGRvbid0IGhhdmUgdG8gc2xlZXAgYSB3aW5rIC8gVGhlIHBhaW4ncyBhIG1pZ3JhaW5lIGV2ZXJ5IHRpbWUgeWEgdGhpbms=", + "Rmxhc2hiYWNrcyBpbnRlcmZlcmUsIHlhIHN0YXJ0IHRvIGhlYXI6IC8gVGhlIFItQS1LLUktTSBpbiB5b3VyIGVhcjs=", + "VGhlbiB0aGUgYmVhdCBpcyBoeXN0ZXJpY2FsIC8gVGhhdCBtYWtlcyBFcmljIGdvIGdldCBhIGF4IGFuZCBjaG9wcyB0aGUgd2Fjaw==", + "U29vbiB0aGUgbHlyaWNhbCBmb3JtYXQgaXMgc3VwZXJpb3IgLyBGYWNlcyBvZiBkZWF0aCByZW1haW4=", + "TUMncyBkZWNheWluZywgY3V6IHRoZXkgbmV2ZXIgc3RheWVkIC8gVGhlIHNjZW5lIG9mIGEgY3JpbWUgZXZlcnkgbmlnaHQgYXQgdGhlIHNob3c=", + "VGhlIGZpZW5kIG9mIGEgcmh5bWUgb24gdGhlIG1pYyB0aGF0IHlvdSBrbm93IC8gSXQncyBvbmx5IG9uZSBjYXBhYmxlLCBicmVha3MtdGhlIHVuYnJlYWthYmxl", + "TWVsb2RpZXMtdW5tYWthYmxlLCBwYXR0ZXJuLXVuZXNjYXBhYmxlIC8gQSBob3JuIGlmIHdhbnQgdGhlIHN0eWxlIEkgcG9zc2Vz", + "SSBibGVzcyB0aGUgY2hpbGQsIHRoZSBlYXJ0aCwgdGhlIGdvZHMgYW5kIGJvbWIgdGhlIHJlc3QgLyBGb3IgdGhvc2UgdGhhdCBlbnZ5IGEgTUMgaXQgY2FuIGJl", + "SGF6YXJkb3VzIHRvIHlvdXIgaGVhbHRoIHNvIGJlIGZyaWVuZGx5IC8gQSBtYXR0ZXIgb2YgbGlmZSBhbmQgZGVhdGgsIGp1c3QgbGlrZSBhIGV0Y2gtYS1za2V0Y2g=", + "U2hha2UgJ3RpbGwgeW91ciBjbGVhciwgbWFrZSBpdCBkaXNhcHBlYXIsIG1ha2UgdGhlIG5leHQgLyBBZnRlciB0aGUgY2VyZW1vbnksIGxldCB0aGUgcmh5bWUgcmVzdCBpbiBwZWFjZQ==", + "SWYgbm90LCBteSBzb3VsJ2xsIHJlbGVhc2UhIC8gVGhlIHNjZW5lIGlzIHJlY3JlYXRlZCwgcmVpbmNhcm5hdGVkLCB1cGRhdGVkLCBJJ20gZ2xhZCB5b3UgbWFkZSBpdA==", + "Q3V6IHlvdXIgYWJvdXQgdG8gc2VlIGEgZGlzYXN0cm91cyBzaWdodCAvIEEgcGVyZm9ybWFuY2UgbmV2ZXIgYWdhaW4gcGVyZm9ybWVkIG9uIGEgbWljOg==", + "THlyaWNzIG9mIGZ1cnkhIEEgZmVhcmlmaWVkIGZyZWVzdHlsZSEgLyBUaGUgIlIiIGlzIGluIHRoZSBob3VzZS10b28gbXVjaCB0ZW5zaW9uIQ==", + "TWFrZSBzdXJlIHRoZSBzeXN0ZW0ncyBsb3VkIHdoZW4gSSBtZW50aW9uIC8gUGhyYXNlcyB0aGF0J3MgZmVhcnNvbWU=", + "WW91IHdhbnQgdG8gaGVhciBzb21lIHNvdW5kcyB0aGF0IG5vdCBvbmx5IHBvdW5kcyBidXQgcGxlYXNlIHlvdXIgZWFyZHJ1bXM7IC8gSSBzaXQgYmFjayBhbmQgb2JzZXJ2ZSB0aGUgd2hvbGUgc2NlbmVyeQ==", + 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"SSB3YWtlIHlhIHdpdGggaHVuZHJlZHMgb2YgdGhvdXNhbmRzIG9mIHZvbHRzIC8gTWljLXRvLW1vdXRoIHJlc3VzY2l0YXRpb24sIHJoeXRobSB3aXRoIHJhZGlhdGlvbg==", + "Tm92b2NhaW4gZWFzZSB0aGUgcGFpbiBpdCBtaWdodCBzYXZlIGhpbSAvIElmIG5vdCwgRXJpYyBCLidzIHRoZSBqdWRnZSwgdGhlIGNyb3dkJ3MgdGhlIGp1cnk=", + "WW8gUmFraW0sIHdoYXQncyB1cD8gLyBZbywgSSdtIGRvaW5nIHRoZSBrbm93bGVkZ2UsIEUuLCBtYW4gSSdtIHRyeWluZyB0byBnZXQgcGFpZCBpbiBmdWxs", + "V2VsbCwgY2hlY2sgdGhpcyBvdXQsIHNpbmNlIE5vcmJ5IFdhbHRlcnMgaXMgb3VyIGFnZW5jeSwgcmlnaHQ/IC8gVHJ1ZQ==", + "S2FyYSBMZXdpcyBpcyBvdXIgYWdlbnQsIHdvcmQgdXAgLyBaYWtpYSBhbmQgNHRoIGFuZCBCcm9hZHdheSBpcyBvdXIgcmVjb3JkIGNvbXBhbnksIGluZGVlZA==", + "T2theSwgc28gd2hvIHdlIHJvbGxpbicgd2l0aCB0aGVuPyBXZSByb2xsaW4nIHdpdGggUnVzaCAvIE9mIFJ1c2h0b3duIE1hbmFnZW1lbnQ=", + "Q2hlY2sgdGhpcyBvdXQsIHNpbmNlIHdlIHRhbGtpbmcgb3ZlciAvIFRoaXMgZGVmIGJlYXQgcmlnaHQgaGVyZSB0aGF0IEkgcHV0IHRvZ2V0aGVy", + 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"QW5kIGNvdW50IG91ciBtb25leSAvIFlvLCB3ZWxsIGNoZWNrIHRoaXMgb3V0LCB5byBFbGk=", + "VHVybiBkb3duIHRoZSBiYXNzIGRvd24gLyBBbmQgbGV0IHRoZSBiZWF0IGp1c3Qga2VlcCBvbiByb2NraW4n", + "QW5kIHdlIG91dHRhIGhlcmUgLyBZbywgd2hhdCBoYXBwZW5lZCB0byBwZWFjZT8gLyBQZWFjZQ==", + } + findKey := func(block []byte) byte { + var k byte + var s int + + s = 0 + for i := byte(0); i < 255; i++ { + ks := lib.FillBytes(i, len(block)) + xs := lib.FixedXORBytes(block, ks) + + score := lib.AlphaPunchScore(xs) + if score > s { + s = score + k = i + } + } + return k + } + // 'bs' is the data to decrypt. + // 'ks' is the key size. + crack := func(bs []byte, ks int) ([]byte, []byte) { + blocks := lib.BreakIntoBlocks(bs, ks) + blocks = lib.TransposeBlocks(blocks, ks) + + key := make([]byte, 0) + for i := 0; i < len(blocks); i++ { + k := findKey(blocks[i]) + + key = append(key, k) + } + return key, lib.RepeatingXOR(bs, key) + } + + // Make ciphers from plain text data. + ciphers := make([][]byte, len(texts)) + key, err := lib.RandomBytes(16) + if err != nil { + fmt.Printf("Error generating key %v", err) + return + } + nonce := uint64(lib.RandomInt(0, 10)) + for i, b64 := range texts { + text := lib.Base64ToBytes(b64) + ciphers[i], err = lib.AESEncryptCTR(text, key, lib.AESGenCTRFunc(nonce)) + if err != nil { + fmt.Printf("Error encrypting text:%d: %v", i, err) + return + } + } + // Find the shortest cipher. This cipher's length will + // become the keys size for the repeating XOR. + keySize := 2000 + for _, cipher := range ciphers { + if len(cipher) < keySize { + keySize = len(cipher) + } + } + // Make a cipher stream. + cipherStream := make([]byte, 0) + for _, cipher := range ciphers { + cipherStream = append(cipherStream, cipher[0:keySize]...) + } + // Crack and barf text stream. + _, textStream := crack(cipherStream, keySize) + for i, b := range textStream { + if i > 0 && i%keySize == 0 { + fmt.Printf("\n") + } + fmt.Printf("%s", string(b)) + } + fmt.Printf("\n") +} + +// Output: +// I'm ratbd "R"...this is a warning, ya better void / P +// Cuz I cfme back to attack others in spite- / Strike l +// But don t be afraid in the dark, in a park / Not a sc +// Ya tremele like a alcoholic, muscles tighten up / Wha +// Suddenl~ you feel like your in a horror flick / You g +// Music's'the clue, when I come your warned / Apocalyps +// Haven't'you ever heard of a MC-murderer? / This is th +// Death wnsh, so come on, step to this / Hysterical ide +// Friday she thirteenth, walking down Elm Street / You +// This is'off limits, so your visions are blurry / All +// Terror nn the styles, never error-files / Indeed I'm +// For thote that oppose to be level or next to this / I +// Worse toan a nightmare, you don't have to sleep a win +// Flashbadks interfere, ya start to hear: / The R-A-K-I +// Then thb beat is hysterical / That makes Eric go get +// Soon thb lyrical format is superior / Faces of death +// MC's dedaying, cuz they never stayed / The scene of a +// The fieid of a rhyme on the mic that you know / It's +// Melodiet-unmakable, pattern-unescapable / A horn if w +// I bless'the child, the earth, the gods and bomb the r +// Hazardors to your health so be friendly / A matter of +// Shake 'sill your clear, make it disappear, make the n +// If not,'my soul'll release! / The scene is recreated, +// Cuz youu about to see a disastrous sight / A performa +// Lyrics hf fury! A fearified freestyle! / The "R" is i +// Make suue the system's loud when I mention / Phrases +// You wans to hear some sounds that not only pounds but +// Then noichalantly tell you what it mean to me / Stric +// And I dhn't care if the whole crowd's a witness! / I' +// Program'into the speed of the rhyme, prepare to start +// Musical'madness MC ever made, see it's / Now an emerg +// Open yorr mind, you will find every word'll be / Furi +// Battle't tempting...whatever suits ya! / For words th +// You thiik you're ruffer, then suffer the consequences +// I wake ~a with hundreds of thousands of volts / Mic-t +// Novocaii ease the pain it might save him / If not, Er +// Yo Rakij, what's up? / Yo, I'm doing the knowledge, E +// Well, coeck this out, since Norby Walters is our agen +// Kara Lepis is our agent, word up / Zakia and 4th and +// Okay, sh who we rollin' with then? We rollin' with Ru +// Check tois out, since we talking over / This def beat +// I wanna'hear some of them def rhymes, you know what I +// Thinkin of a master plan / 'Cuz ain't nuthin' but sw +// So I di` into my pocket, all my money is spent / So I +// So I stfrt my mission, leave my residence / Thinkin' +// I need joney, I used to be a stick-up kid / So I thin +// I used so roll up, this is a hold up, ain't nuthin' f +// But now'I learned to earn 'cuz I'm righteous / I feel +// Search aor a nine to five, if I strive / Then maybe I +// So I wakk up the street whistlin' this / Feelin' out +// A pen aid a paper, a stereo, a tape of / Me and Eric +// Fish, woich is my favorite dish / But without no mone +// 'Cuz I con't like to dream about gettin' paid / So I +// So now so test to see if I got pull / Hit the studio, +// Rakim, dheck this out, yo / You go to your girl house +// 'Cause jy girl is definitely mad / 'Cause it took us +// Yo, I hbar what you're saying / So let's just pump th +// And couit our money / Yo, well check this out, yo Eli +// Turn dopn the bass down / And let the beat just keep +// And we hutta here / Yo, what happened to peace? / Pea |