Sqlite Hashing Functions Library

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I have found a way to quite easily use the existing digest functions provided by OpenSSL. I have successfully been able to compile and run this on Solaris 10×86 and I think that as long as you have a current ssl implementation, this should work quite well. I have not thoroughly tested everything however, but have repeated the EVP_ function code pattern found here. This pattern is very simple and easy to use. I have also used a code pattern for a sample Sqlite3 Extension from here. As it is, the documentation is good enough to perform the simple task a few times and at a minimum for my implementation include these algorithms: md2, md5, sha, sha1, ripemd160.

Code Pattern for the Sqlite Extension

static void [function_name](
    sqlite3_context *context,
    int argc,
    sqlite3_value **argv
){
        unsigned char md_value[EVP_MAX_MD_SIZE];
        int md_len,i;
        if ( argc != 1 ){
                sqlite3_result_null(context);
                return ;
        }
        EVP_MD_CTX ctx  ;
        EVP_MD_CTX_init(&amp;ctx);
        if(EVP_DigestInit_ex(&amp;ctx,EVP_[function_name](),NULL)){
                char * input = 0 ;
                char * output = 0 ;
                input = ( char * ) sqlite3_value_text(argv[0]);
                EVP_DigestUpdate(&amp;ctx, input, strlen(input));
                EVP_DigestFinal_ex(&amp;ctx,md_value,&amp;md_len);
                output = ( char * ) malloc ( md_len * 2 + 1 );
                if ( !output ){
                        sqlite3_result_null(context);
                        EVP_MD_CTX_cleanup(&amp;ctx);
                        return ;
                }
                for (i = 0; i &lt; md_len; i++){
                        sprintf (&amp;output[i*2],"%02x", (unsigned char)md_value[i]);
                }
                sqlite3_result_text(context,output,strlen(output),(void*)-1);
                free(output);
                output=0;
        }else{
                sqlite3_result_null(context);
        }
        EVP_MD_CTX_cleanup(&amp;ctx);
}

Sqlite Init Function

int sqlite3_extension_init(
  sqlite3 *db,
  char **pzErrMsg,
  const sqlite3_api_routines *pApi
){
  SQLITE_EXTENSION_INIT2(pApi)
  sqlite3_create_function(db, "md2", 1, SQLITE_ANY, 0, md2, 0, 0);
  sqlite3_create_function(db, "md5", 1, SQLITE_ANY, 0, md5, 0, 0);
  sqlite3_create_function(db, "sha", 1, SQLITE_ANY, 0, sha, 0, 0);
  sqlite3_create_function(db, "sha1", 1, SQLITE_ANY, 0, sha1, 0, 0);
// ** Not Used as it didn't seem to be available in my OpenSSL
//  sqlite3_create_function(db, "mdc2", 1, SQLITE_ANY, 0, mdc2, 0, 0);
  sqlite3_create_function(db, "ripemd160", 1, SQLITE_ANY, 0, ripemd160, 0, 0);
  return 0;
}

Command Line Used for Compilation

The command line I used to compile was quite simple and just needed to include the -lssl .

gcc -shared -fPIC -Isqlite3 -lssl -o sqlite_digest.ext sqlite_digest.c

My set up includes sqlite and openssl in my include path so there may be issues if this is not your set up.

Loading the library in Sqlite

To load the library in Sqlite, you simply need to run the command line version as follows:

sqlite3 [optional database name]
sqlite>SELECT load_extension('./sqlite_digest.ext');
sqlite>SELECT md2('test');
dd34716876364a02d0195e2fb9ae2d1b
sqlite>SELECT md5('test');
098f6bcd4621d373cade4e832627b4f6
sqlite>SELECT sha('test');
f8d3b312442a67706057aeb45b983221afb4f035
sqlite>SELECT sha1('test');
a94a8fe5ccb19ba61c4c0873d391e987982fbbd3
sqlite>SELECT ripemd160('test');
5e52fee47e6b070565f74372468cdc699de89107