SYNOPSIS

          bool
          mongoc_client_encryption_encrypt_expression (
             mongoc_client_encryption_t *client_encryption,
             const bson_t *expr,
             mongoc_client_encryption_encrypt_opts_t *opts,
             bson_t *expr_out,
             bson_error_t *error);

       Added in version 1.24.0.

       Encrypts a Match Expression or Aggregate Expression to query a range index.

       To   query   with   a   Range   encrypted   payload,   use   a   mongoc_client_t   <>   configured   with
       mongoc_auto_encryption_opts_t <>. The mongoc_auto_encryption_opts_t <> may be configured to bypass  query
       analysis        with        mongoc_auto_encryption_opts_set_bypass_query_analysis()        <>.        The
       mongoc_auto_encryption_opts_t  <>  must  not  be  configured  to   bypass   automatic   encryption   with
       mongoc_auto_encryption_opts_set_bypass_auto_encryption() <>.

       To query with a Range payload, expr must be one of the following forms:

       1. A Match Expression of the following form:

             // $gt may also be $gte. $lt may also be $lte.
             // Can include one of $gt/$gte/$lt/$lte. It is not required to include both.
             {"$and": [{"<field>": {"$gt": "<value1>"}}, {"<field>": {"$lt": "<value2>" }}]}

       2. An Aggregation Expression of this form:

             // $gt may also be $gte. $lt may also be $lte
             // Can include one of $gt/$gte/$lt/$lte. It is not required to include both.
             {"$and": [{"$gt": ["<fieldpath>", "<value1>"]}, {"$lt": ["<fieldpath>", "<value2>"]}]

PARAMETERS

       • client_encryption: A mongoc_client_encryption_t <>

       • expr: The expression to encrypt.

       • opts: A mongoc_client_encryption_encrypt_opts_t <>.

       • expr_out:  A  bson_t  <https://www.mongoc.org/libbson/current/bson_t.html>  for the resulting encrypted
         expression. expr_out is always initialized (even on failure). Caller must call bson_destroy() <https://
         www.mongoc.org/libbson/current/bson_destroy.html> to free.

       • error: A bson_error_t <https://www.mongoc.org/libbson/current/bson_error_t.html> set on failure.

RETURNS

       Returns true if successful. Returns false and sets error otherwise.

       See also:
          mongoc_client_encryption_encrypt_opts_t <>

          mongoc_client_enable_auto_encryption() <>

          mongoc_client_decryption_decrypt() <>

Author

       MongoDB, Inc

Copyright

       2009-present, MongoDB, Inc.

2.2.0                                             Nov 26, 2025    MONGOC_CLIENT_ENCRYPTION_ENCRYPT_EXPRESSION(3)