crypto/evp/e_rc4_hmac_md5.c

235             unsigned char hmac_key[64];
237             memset(hmac_key, 0, sizeof(hmac_key));
239             if (arg > (int)sizeof(hmac_key)) {
242                 MD5_Final(hmac_key, &key->head);
244                 memcpy(hmac_key, ptr, arg);
247             for (i = 0; i < sizeof(hmac_key); i++)
248                 hmac_key[i] ^= 0x36; /* ipad */
250             MD5_Update(&key->head, hmac_key, sizeof(hmac_key));
252             for (i = 0; i < sizeof(hmac_key); i++)
253                 hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
255             MD5_Update(&key->tail, hmac_key, sizeof(hmac_key));
257             OPENSSL_cleanse(hmac_key, sizeof(hmac_key));