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-rw-r--r--challenge/c17.go13
1 files changed, 10 insertions, 3 deletions
diff --git a/challenge/c17.go b/challenge/c17.go
index 45c53bd..78c949c 100644
--- a/challenge/c17.go
+++ b/challenge/c17.go
@@ -11,6 +11,10 @@ import (
// Cryptopals #17 - CBC padding oracle attack
func C17() {
+ key, err := lib.RandomKey(16)
+ if err != nil {
+ fmt.Printf("key generation: error: %v\n", err)
+ }
cookies := []string{
"MDAwMDAwTm93IHRoYXQgdGhlIHBhcnR5IGlzIGp1bXBpbmc=",
"MDAwMDAxV2l0aCB0aGUgYmFzcyBraWNrZWQgaW4gYW5kIHRoZSBWZWdhJ3MgYXJlIHB1bXBpbic=",
@@ -26,14 +30,17 @@ func C17() {
encrypt := func() ([]byte, []byte) {
r := lib.RandomInt(0, int64(len(cookies)-1))
p := lib.Base64ToBytes(cookies[r])
- k := lib.OracleKey
- iv := lib.OracleIV
+ k := key
+ iv, err := lib.RandomKey(16)
+ if err != nil {
+ fmt.Printf("iv generation: error: %v\n", err)
+ }
c := lib.AESEncryptCBC(p, k, iv)
return c, iv
}
decrypt := func(c, iv []byte) bool {
- k := lib.OracleKey
+ k := key
_, err := lib.AESDecryptCBC(c, k, iv)
if err != nil {
return false