Fix wrong ccm key size

Author: ymtdzzz

dtls/src/crypto/crypto_ccm.rs

@@ -19,7 +19,7 @@ use crate::content::*;
 use crate::errors::*;
 use crate::record_layer::record_layer_header::*;
 
-use aes::Aes256;
+use aes::Aes128;
 use ccm::aead::{generic_array::GenericArray, AeadInPlace, NewAead};
 use ccm::{
     consts::{U12, U16, U8},
@@ -30,8 +30,8 @@ const CRYPTO_CCM_8_TAG_LENGTH: usize = 8;
 const CRYPTO_CCM_TAG_LENGTH: usize = 16;
 const CRYPTO_CCM_NONCE_LENGTH: usize = 12;
 
-type AesCcm8 = Ccm<Aes256, U8, U12>;
-type AesCcm = Ccm<Aes256, U16, U12>;
+type AesCcm8 = Ccm<Aes128, U8, U12>;
+type AesCcm = Ccm<Aes128, U16, U12>;
 
 #[derive(Clone)]
 pub enum CryptoCcmTagLen {

dtls/src/crypto/crypto_test.rs

@@ -107,8 +107,7 @@ fn test_generate_key_signature() -> Result<(), Error> {
 fn test_ccm_encryption_and_decryption() -> Result<(), Error> {
     let key = vec![
         0x18, 0x78, 0xac, 0xc2, 0x2a, 0xd8, 0xbd, 0xd8, 0xc6, 0x01, 0xa6, 0x17, 0x12, 0x6f, 0x63,
-        0x54, 0x18, 0x78, 0xac, 0xc2, 0x2a, 0xd8, 0xbd, 0xd8, 0xc6, 0x01, 0xa6, 0x17, 0x12, 0x6f,
-        0x63, 0x54,
+        0x54,
     ];
     let iv = vec![0x0e, 0xb2, 0x09, 0x06];