| -rw-r--r-- | lib/consumer.cc | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/lib/consumer.cc b/lib/consumer.cc index 12866f0..282f0cc 100644 --- a/lib/consumer.cc +++ b/lib/consumer.cc @@ -100,13 +100,14 @@ namespace opkele { }else{ util::bignum_t s_pub = util::base64_to_bignum(p.get_param("dh_server_public")); - vector<unsigned char> ck(DH_size(dh)); - int cklen = DH_compute_key(&(ck.front()),s_pub,dh); + vector<unsigned char> ck(DH_size(dh)+1); + unsigned char *ckptr = &(ck.front())+1; + int cklen = DH_compute_key(ckptr,s_pub,dh); if(cklen<0) throw exception_openssl(OPKELE_CP_ "failed to DH_compute_key()"); - ck.resize(cklen); - // OpenID algorithm requires extra zero in case of set bit here - if(ck[0]&0x80) ck.insert(ck.begin(),1,0); + if(cklen && (*ckptr)&0x80) { + (*(--ckptr)) = 0; ++cklen; + } unsigned char key_sha1[SHA_DIGEST_LENGTH]; - SHA1(&(ck.front()),ck.size(),key_sha1); + SHA1(ckptr,cklen,key_sha1); secret.enxor_from_base64(key_sha1,p.get_param("enc_mac_key")); } |