func main() {
encoded := util.ReadFile("25.txt")
bytes, err := base64.StdEncoding.DecodeString(string(encoded))
if err != nil {
log.Fatal(err)
}
oldAes, err := aes.NewCipher([]byte("YELLOW SUBMARINE"))
if err != nil {
log.Fatal(err)
}
util.ECBDecrypt(oldAes, bytes, bytes)
// we have plaintext in bytes
// encrypt it in CTR mode
block, err := aes.NewCipher(key)
if err != nil {
log.Fatal(err)
}
util.CTREncrypt(block, nonce, bytes, bytes)
// save the copy
ct := make([]byte, len(bytes))
copy(ct, bytes)
// let's prepare sequence of 0 bytes and replace the text with it
zeroes := make([]byte, len(bytes))
edit(bytes, 0, zeroes)
// result in bytes contains the key
// let's recover the original plain text:
for i := 0; i < len(ct); i++ {
bytes[i] = ct[i] ^ bytes[i]
}
fmt.Println(string(bytes))
}
func main() {
encoded := util.ReadFile("6.txt")
bytes, _ := base64.StdEncoding.DecodeString(string(encoded))
fmt.Println("bytes:", len(bytes))
fmt.Println("test: ", hammingDistance([]byte("this is a test"), []byte("wokka wokka!!!")))
size := findSizeRepeatXor(bytes)
key := breakRepeatXor(bytes, size)
fmt.Printf("key:\n%s\n", string(key))
decoded := encodeKeyXor(bytes, key)
fmt.Printf("decoded:\n%s\n", string(decoded))
}
func main() {
encoded := util.ReadFile("10.txt")
src, _ := base64.StdEncoding.DecodeString(string(encoded))
key := []byte("YELLOW SUBMARINE")
iv := make([]byte, 16)
block, _ := aes.NewCipher(key)
util.CBCDecrypt(block, iv, src, src)
util.CBCEncrypt(block, iv, src, src)
util.CBCDecrypt(block, iv, src, src)
fmt.Println(string(src))
}
func main() {
key := []byte("YELLOW SUBMARINE")
encoded := util.ReadFile("7.txt")
bytes, _ := base64.StdEncoding.DecodeString(string(encoded))
fmt.Println(len(bytes))
block, err := aes.NewCipher(key)
if err != nil {
fmt.Println(err)
}
// dst := make([]byte, 16)
for i := 0; i < len(bytes); i += 16 {
block.Decrypt(bytes[i:i+16], bytes[i:i+16])
}
fmt.Println(string(bytes))
}