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-rw-r--r--lib/snmp/src/misc/snmp_usm.erl23
1 files changed, 15 insertions, 8 deletions
diff --git a/lib/snmp/src/misc/snmp_usm.erl b/lib/snmp/src/misc/snmp_usm.erl
index 67e3476816..32198deb8b 100644
--- a/lib/snmp/src/misc/snmp_usm.erl
+++ b/lib/snmp/src/misc/snmp_usm.erl
@@ -16,6 +16,8 @@
%%
%% %CopyrightEnd%
%%
+%% AES: RFC 3826
+%%
-module(snmp_usm).
@@ -24,7 +26,7 @@
-export([passwd2localized_key/3, localize_key/3]).
-export([auth_in/4, auth_out/4, set_msg_auth_params/3]).
-export([des_encrypt/3, des_decrypt/3]).
--export([aes_encrypt/3, aes_decrypt/5]).
+-export([aes_encrypt/5, aes_decrypt/5]).
-define(SNMP_USE_V3, true).
@@ -42,6 +44,9 @@
-define(i32(Int), (Int bsr 24) band 255, (Int bsr 16) band 255, (Int bsr 8) band 255, Int band 255).
+-define(BLOCK_CIPHER_AES, aes_cfb128).
+-define(BLOCK_CIPHER_DES, des_cbc).
+
%%-----------------------------------------------------------------
%% Func: passwd2localized_key/3
@@ -210,7 +215,8 @@ des_encrypt(PrivKey, Data, SaltFun) ->
IV = list_to_binary(snmp_misc:str_xor(PreIV, Salt)),
TailLen = (8 - (length(Data) rem 8)) rem 8,
Tail = mk_tail(TailLen),
- EncData = crypto:block_encrypt(des_cbc, DesKey, IV, [Data,Tail]),
+ EncData = crypto:block_encrypt(?BLOCK_CIPHER_DES,
+ DesKey, IV, [Data,Tail]),
{ok, binary_to_list(EncData), Salt}.
des_decrypt(PrivKey, MsgPrivParams, EncData)
@@ -224,7 +230,8 @@ des_decrypt(PrivKey, MsgPrivParams, EncData)
Salt = MsgPrivParams,
IV = list_to_binary(snmp_misc:str_xor(PreIV, Salt)),
%% Whatabout errors here??? E.g. not a mulitple of 8!
- Data = binary_to_list(crypto:block_decrypt(des_cbc, DesKey, IV, EncData)),
+ Data = binary_to_list(crypto:block_decrypt(?BLOCK_CIPHER_DES,
+ DesKey, IV, EncData)),
Data2 = snmp_pdus:strip_encrypted_scoped_pdu_data(Data),
{ok, Data2};
des_decrypt(PrivKey, BadMsgPrivParams, EncData) ->
@@ -236,13 +243,12 @@ des_decrypt(PrivKey, BadMsgPrivParams, EncData) ->
throw({error, {bad_msgPrivParams, PrivKey, BadMsgPrivParams, EncData}}).
-aes_encrypt(PrivKey, Data, SaltFun) ->
+aes_encrypt(PrivKey, Data, SaltFun, EngineBoots, EngineTime) ->
AesKey = PrivKey,
Salt = SaltFun(),
- EngineBoots = snmp_framework_mib:get_engine_boots(),
- EngineTime = snmp_framework_mib:get_engine_time(),
IV = list_to_binary([?i32(EngineBoots), ?i32(EngineTime) | Salt]),
- EncData = crypto:block_encrypt(aes_cbf128, AesKey, IV, Data),
+ EncData = crypto:block_encrypt(?BLOCK_CIPHER_AES,
+ AesKey, IV, Data),
{ok, binary_to_list(EncData), Salt}.
aes_decrypt(PrivKey, MsgPrivParams, EncData, EngineBoots, EngineTime)
@@ -251,7 +257,8 @@ aes_decrypt(PrivKey, MsgPrivParams, EncData, EngineBoots, EngineTime)
Salt = MsgPrivParams,
IV = list_to_binary([?i32(EngineBoots), ?i32(EngineTime) | Salt]),
%% Whatabout errors here??? E.g. not a mulitple of 8!
- Data = binary_to_list(crypto:block_decrypt(aes_cbf128, AesKey, IV, EncData)),
+ Data = binary_to_list(crypto:block_decrypt(?BLOCK_CIPHER_AES,
+ AesKey, IV, EncData)),
Data2 = snmp_pdus:strip_encrypted_scoped_pdu_data(Data),
{ok, Data2}.