From fd3d404c297d5e20bf318904ba9cb1128f626fb1 Mon Sep 17 00:00:00 2001 From: siddharth Date: Sat, 19 Jun 2021 12:00:04 -0400 Subject: challenge: do challenge 20 --- challenge/c20.go | 207 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ cryptopals.go | 2 + 2 files changed, 209 insertions(+) create mode 100644 challenge/c20.go 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 +// SPDX-License-Identifier: ISC + +package challenge + +import ( + "fmt" + + "ricketyspace.net/cryptopals/lib" +) + +func C20() { + texts := []string{ + "SSdtIHJhdGVkICJSIi4uLnRoaXMgaXMgYSB3YXJuaW5nLCB5YSBiZXR0ZXIgdm9pZCAvIFBvZXRzIGFyZSBwYXJhbm9pZCwgREoncyBELXN0cm95ZWQ=", + "Q3V6IEkgY2FtZSBiYWNrIHRvIGF0dGFjayBvdGhlcnMgaW4gc3BpdGUtIC8gU3RyaWtlIGxpa2UgbGlnaHRuaW4nLCBJdCdzIHF1aXRlIGZyaWdodGVuaW4nIQ==", + 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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 diff --git a/cryptopals.go b/cryptopals.go index 4448d7e..103bfbb 100644 --- a/cryptopals.go +++ b/cryptopals.go @@ -57,5 +57,7 @@ func main() { challenge.C18() case 19: challenge.C19() + case 20: + challenge.C20() } } -- cgit v1.2.3