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wangyu- 2018-07-21 07:45:10 -05:00
parent fabe2b3558
commit 1e98ae10c2
1 changed files with 2 additions and 2 deletions
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4
encrypt.cpp
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@ -19,7 +19,7 @@ static int8_t zero_iv[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0};//this prog
****/
char normal_key[16 + 100];//generated from key_string by md5. reserved for compatiblity
const int hmac_key_len=64;//generate 512bit long keys, but its necessary to use the full length
const int hmac_key_len=64;//generate 512bit long keys, use first n chars when needed
const int cipher_key_len=64;
unsigned char hmac_key_encrypt[hmac_key_len + 100]; //key for hmac
unsigned char hmac_key_decrypt[hmac_key_len + 100]; //key for hmac
@ -161,7 +161,7 @@ int auth_hmac_sha1_cal(const char *data,char * output,int &len)
mylog(log_trace,"auth_hmac_sha1_cal() is called\n");
memcpy(output,data,len);//TODO inefficient code
sha1_hmac(hmac_key_encrypt, 20, (const unsigned char *)data, len,(unsigned char *)(output+len));
//use key len of 20 instead of hmac_key_len, key_len >sha1_block_size doesnt provide extra strength
//use key len of 20 instead of hmac_key_len, "extra length would not significantly increase the function strength" (rfc2104)
len+=20;
return 0;
}