1 files changed, 56 insertions, 11 deletions

diff --git a/lib/util.cc b/lib/util.cc
index d78b5e0..d9abca7 100644
--- a/lib/util.cc
+++ b/lib/util.cc
@@ -2,7 +2,8 @@
 #include <cassert>
 #include <vector>
 #include <string>
-#include <mimetic/mimetic.h>
+#include <openssl/bio.h>
+#include <openssl/evp.h>
 #include <curl/curl.h>
 #include "opkele/util.h"
 #include "opkele/exception.h"
@@ -13,15 +14,64 @@ namespace opkele {
     namespace util {
 
         /*
+         * base64
+         */
+        string encode_base64(const void *data,size_t length) {
+            BIO *b64 = 0, *bmem = 0;
+            try {
+                b64 = BIO_new(BIO_f_base64());
+                if(!b64)
+                    throw exception_openssl(OPKELE_CP_ "failed to BIO_new() base64 encoder");
+                BIO_set_flags(b64,BIO_FLAGS_BASE64_NO_NL);
+                bmem = BIO_new(BIO_s_mem());
+                BIO_set_flags(b64,BIO_CLOSE);
+                if(!bmem)
+                    throw exception_openssl(OPKELE_CP_ "failed to BIO_new() memory buffer");
+                BIO_push(b64,bmem);
+                if(BIO_write(b64,data,length)!=length)
+                    throw exception_openssl(OPKELE_CP_ "failed to BIO_write()");
+                BIO_flush(b64);
+                char *rvd;
+                long rvl = BIO_get_mem_data(bmem,&rvd);
+                string rv(rvd,rvl);
+                BIO_free_all(b64);
+                return rv;
+            }catch(...) {
+                if(b64) BIO_free_all(b64);
+                throw;
+            }
+        }
+
+        void decode_base64(const string& data,vector<unsigned char>& rv) {
+            BIO *b64 = 0, *bmem = 0;
+            rv.clear();
+            try {
+                bmem = BIO_new_mem_buf((void*)data.data(),data.size());
+                if(!bmem)
+                    throw exception_openssl(OPKELE_CP_ "failed to BIO_new_mem_buf()");
+                b64 = BIO_new(BIO_f_base64());
+                if(!b64)
+                    throw exception_openssl(OPKELE_CP_ "failed to BIO_new() base64 decoder");
+                BIO_set_flags(b64,BIO_FLAGS_BASE64_NO_NL);
+                BIO_push(b64,bmem);
+                unsigned char tmp[512];
+                size_t rb = 0;
+                while((rb=BIO_read(b64,tmp,sizeof(tmp)))>0)
+                    rv.insert(rv.end(),tmp,&tmp[rb]);
+                BIO_free_all(b64);
+            }catch(...) {
+                if(b64) BIO_free_all(b64);
+                throw;
+            }
+        }
+
+        /*
          * big numerics
          */
 
         BIGNUM *base64_to_bignum(const string& b64) {
             vector<unsigned char> bin;
-            mimetic::Base64::Decoder b;
-            mimetic::decode(
-                    b64.begin(),b64.end(), b,
-                    back_insert_iterator<vector<unsigned char> >(bin) );
+            decode_base64(b64,bin);
             BIGNUM *rv = BN_bin2bn(&(bin.front()),bin.size(),0);
             if(!rv)
                 throw failed_conversion(OPKELE_CP_ "failed to BN_bin2bn()");
@@ -38,12 +88,7 @@ namespace opkele {
         string bignum_to_base64(const BIGNUM *bn) {
             vector<unsigned char> bin(BN_num_bytes(bn));
             int l = BN_bn2bin(bn,&(bin.front()));
-            string rv;
-            mimetic::Base64::Encoder b(0);
-            mimetic::encode(
-                    bin.begin(),bin.begin()+l, b,
-                    back_insert_iterator<string>(rv) );
-            return rv;
+            return encode_base64(&(bin.front()),l);
         }
 
         /*