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-rw-r--r--challenge/c08.go14
1 files changed, 9 insertions, 5 deletions
diff --git a/challenge/c08.go b/challenge/c08.go
index b8c9e10..c31024b 100644
--- a/challenge/c08.go
+++ b/challenge/c08.go
@@ -12,21 +12,25 @@ func C8() {
for i := 0; i < len(c08); i++ {
bs := lib.StrToBytes(c08[i])
- if isECB(bs) {
- fmt.Printf("Cipher at %d (%s) might be AES-ECB\n", i, c08[i])
+ block := isECB(bs)
+ if block != nil {
+ fmt.Printf("Cipher at line %d (%s)", i+1, c08[i])
+ fmt.Printf(" might be AES encrypted in ECB mode.\n")
+ fmt.Printf("16-byte block '%s'", block)
+ fmt.Printf(" occurs twice in this cipher.\n")
}
}
}
-func isECB(bs []byte) bool {
+func isECB(bs []byte) []byte {
blocks := lib.BreakIntoBlocks(bs, 16)
for i := 0; i < len(blocks); i++ {
if hasMatchingBlock(i, blocks) {
- return true
+ return blocks[i]
}
}
- return false
+ return nil
}
func hasMatchingBlock(id int, blocks [][]byte) bool {