crash.nim

import nimcrypto
import winim/clr

# SharpKatz below
let
    desiredResult: array[11, byte] = [byte 0x48,0x65,0x6c,0x6c,0x6f,0x20,0x77,0x6f,0x72,0x6c,0x64]
    cryptedInput: array[11, byte] = [byte 0x50,0x9d,0xaa,0xd5,0xdb,0xfc,0xc1,0x53,0xac,0xe2,0x27]
    cryptIV: array[16, byte] = [byte 0x11,0x65,0xde,0x9f,0xfe,0xc9,0x15,0x33,0x6e,0x0a,0x8a,0x2e,0x4a,0x2d,0xff,0xb7]
    cryptKey: array[16, byte] = [byte 0x50,0x61,0x4e,0x63,0x41,0x6b,0x33,0x73,0x5f,0x52,0x5f,0x54,0x34,0x73,0x54,0x79]


func toByteSeq*(str: string): seq[byte] {.inline.} =
  @(str.toOpenArrayByte(0, str.high))

var
    dctx: CTR[aes128]
    key : array[aes128.sizeKey, byte]
    iv : array[aes128.sizeBlock, byte]
    enctext = newSeq[byte](len(cryptedInput))
    dectext = newSeq[byte](len(cryptedInput))

key = cryptKey
iv = cryptIV

copyMem(unsafeAddr enctext[0], unsafeAddr cryptedInput[0], len(cryptedInput))

dctx.init(key, iv)
dctx.decrypt(enctext, dectext)
dctx.clear()

doAssert dectext == desiredResult
echo "DEBUG: Decryption success."