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-rw-r--r--challenge/ch13.go30
1 files changed, 30 insertions, 0 deletions
diff --git a/challenge/ch13.go b/challenge/ch13.go
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+++ b/challenge/ch13.go
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+// Copyright © 2020 rsiddharth <s@ricketyspace.net>
+// SPDX-License-Identifier: ISC
+
+package challenge
+
+import (
+ "fmt"
+ "ricketyspace.net/cryptopals/lib"
+)
+
+func C13() {
+ adminBlock := lib.BytesToStr(lib.Pkcs7Padding(lib.StrToBytes("admin"), 16))
+ ep := lib.WebProfileFor("foo@abacus" + adminBlock)
+ encryptedEP := lib.WebEncryptProfile(ep)
+ adminBlockCipher := encryptedEP[16:32] // Second block in the cipher
+
+ ep = lib.WebProfileFor("foo@abacus")
+ encryptedEP = lib.WebEncryptProfile(ep)
+ for i := 0; i < 16; i++ { // Replace last block with the admin cipher block.
+ encryptedEP[32+i] = adminBlockCipher[i]
+ }
+ adminEP := lib.WebDecryptProfile(encryptedEP)
+ adminProfile := lib.WebDecodeProfile(adminEP)
+ fmt.Printf("Admin Encoded Profile: %v\n", adminEP)
+ fmt.Printf("Admin Profile: %v\n", adminProfile)
+}
+
+// Output:
+// Admin Encoded Profile: email=foo@abacus&uid=10001&role=admin
+// Admin Profile: map[email:foo@abacus role:admin uid:10001]