diff options
Diffstat (limited to 'challenge/c15.go')
| -rw-r--r-- | challenge/c15.go | 28 |
1 files changed, 19 insertions, 9 deletions
diff --git a/challenge/c15.go b/challenge/c15.go index 40892ec..e974d64 100644 --- a/challenge/c15.go +++ b/challenge/c15.go @@ -15,7 +15,7 @@ func C15() { padded_ice := lib.Pkcs7Padding(ice, 16) fmt.Printf("ice padded: %v\n", padded_ice) - unpadded_ice := lib.Pkcs7PaddingUndo(padded_ice) + unpadded_ice, _ := lib.Pkcs7PaddingUndo(padded_ice) for i := 0; i < len(ice); i++ { if ice[i] != unpadded_ice[i] { panic("padding undo failed!") @@ -23,18 +23,28 @@ func C15() { } fmt.Printf("unpadded ice: %v\n", unpadded_ice) - // Will fail and panic - // bad_ice := append(ice, []byte{5, 5, 5, 5}...) - // fmt.Printf("bad ice: %v\n", bad_ice) - // lib.Pkcs7PaddingUndo(bad_ice) + // Will fail. + bad_ice := append(ice, []byte{5, 5, 5, 5}...) + fmt.Printf("bad ice: %v\n", bad_ice) + _, err := lib.Pkcs7PaddingUndo(bad_ice) + if err != nil { + fmt.Printf("bad ice upadding failed: %s\n", err.Error()) + } - // Will fail and panic - // evil_ice := append(ice, []byte{1, 2, 3, 4}...) - // fmt.Printf("evil ice: %v\n", evil_ice) - // lib.Pkcs7PaddingUndo(evil_ice) + // Will fail. + evil_ice := append(ice, []byte{1, 2, 3, 4}...) + fmt.Printf("evil ice: %v\n", evil_ice) + _, err = lib.Pkcs7PaddingUndo(evil_ice) + if err != nil { + fmt.Printf("evil ice upadding failed: %s\n", err.Error()) + } } // Output: // ice: [73 67 69 32 73 67 69 32 66 65 66 89] // ice padded: [73 67 69 32 73 67 69 32 66 65 66 89 4 4 4 4] // unpadded ice: [73 67 69 32 73 67 69 32 66 65 66 89] +// bad ice: [73 67 69 32 73 67 69 32 66 65 66 89 5 5 5 5] +// bad ice upadding failed: input is not pkcs#7 padded +// evil ice: [73 67 69 32 73 67 69 32 66 65 66 89 1 2 3 4] +// evil ice upadding failed: input is not pkcs#7 padded |