of password-based encryption from RFC2440 (OpenPGP). The goal of this code is to be more featureful encryption solution than current encrypt(), which only functionality is running cipher over data. Compared to encrypt(), pgp_encrypt() does following: * It uses the equvialent of random Inital Vector to get cipher into random state before it processes user data * Stores SHA-1 of the data into result so any modification will be detected. * Remembers if data was text or binary - thus it can decrypt to/from text data. This was a major nuisance for encrypt(). * Stores info about used algorithms with result, so user needs not remember them - more user friendly! * Uses String2Key algorithms (similar to crypt()) with random salt to generate full-length binary key to be used for encrypting. * Uses standard format for data - you can feed it to GnuPG, if needed. Optional features (off by default): * Can use separate session key - user data will be encrypted with totally random key, which will be encrypted with S2K generated key and attached to result. * Data compression with zlib. * Can convert between CRLF<->LF line-endings - to get fully RFC2440-compliant behaviour. This is off by default as pgcrypto does not know the line-endings of user data. Interface is simple: pgp_encrypt(data text, key text) returns bytea pgp_decrypt(data text, key text) returns text pgp_encrypt_bytea(data bytea, key text) returns bytea pgp_decrypt_bytea(data bytea, key text) returns bytea To change parameters (cipher, compression, mdc): pgp_encrypt(data text, key text, parms text) returns bytea pgp_decrypt(data text, key text, parms text) returns text pgp_encrypt_bytea(data bytea, key text, parms text) returns bytea pgp_decrypt_bytea(data bytea, key text, parms text) returns bytea Parameter names I lifted from gpg: pgp_encrypt('message', 'key', 'compress-algo=1,cipher-algo=aes256') For text data, pgp_encrypt simply encrypts the PostgreSQL internal data. This maps to RFC2440 data type 't' - 'extenally specified encoding'. But this may cause problems if data is dumped and reloaded into database which as different internal encoding. My next goal is to implement data type 'u' - which means data is in UTF-8 encoding by converting internal encoding to UTF-8 and back. And there wont be any compatibility problems with current code, I think its ok to submit this without UTF-8 encoding by converting internal encoding to UTF-8 and back. And there wont be any compatibility problems with current code, I think its ok to submit this without UTF-8 support. Here is v4 of PGP encrypt. This depends on previously sent Fortuna-patch, as it uses the px_add_entropy function. - New function: pgp_key_id() for finding key id's. - Add SHA1 of user data and key into RNG pools. We need to get randomness from somewhere, and it is in user best interests to contribute. - Regenerate pgp-armor test for SQL_ASCII database. - Cleanup the key handling so that the pubkey support is less hackish. Marko Kreen |
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contrib | ||
doc | ||
src | ||
COPYRIGHT | ||
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README | ||
README.CVS | ||
aclocal.m4 | ||
configure | ||
configure.in |
README
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. The JDBC, ODBC, C++, Python, and Tcl interfaces have been moved to the PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate maintenance. A Perl DBI/DBD driver is available from CPAN. See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.