It always returns a VARCHAR2(16) regardless of the length of the input parameters. The GET_HASH function is used to hash the combination of the username and password. The overloads of VALID_USER allow the security check to be performed in a different manner. RAISE_APPLICATION_ERROR(-20000, 'Invalid username/password.') ĪND password = get_hash(p_username, p_password) SET password = get_hash(p_username, p_new_password) RETURN DBMS_CRYPTO.HASH(UTL_RAW.CAST_TO_RAW(UPPER(p_username) || l_salt || UPPER(p_password)),DBMS_CRYPTO.HASH_SH1) ĪND password = get_hash(p_username, p_old_password) Oracle 10g+ : Requires EXECUTE on DBMS_CRYPTO input_string => UPPER(p_username) || l_salt || UPPER(p_password)) L_salt VARCHAR2(30) := 'PutYourSaltHere' We then create the package body to define the actual operations.ĬREATE OR REPLACE PACKAGE BODY app_user_security AS PROCEDURE valid_user (p_username IN VARCHAR2,įUNCTION valid_user (p_username IN VARCHAR2, PROCEDURE change_password (p_username IN VARCHAR2, PROCEDURE add_user (p_username IN VARCHAR2, Next we create the package that contains the specification of the security code.ĬREATE OR REPLACE PACKAGE app_user_security ASįUNCTION get_hash (p_username IN VARCHAR2, Case Sensitive Passwords in Oracle Database 11g Release 1įirst we must build a table to hold the security information.ĬONSTRAINT app_users_uk UNIQUE (username)ĬREATE SEQUENCE app_users_seq Security Package.Data Encryption - DBMS_OBFUSCATION_TOOLKIT.In this article I'll present a simple example of this process using the DBMS_OBFUSCATION_TOOLKIT package, available in Oracle 8i and Oracle 9i, and the DBMS_CRYPTO package, available in Oracle 10g onward. A safer alternative is to store a hash of the username and password. The problem with encryption is that it implies a possible decryption mechanism that could expose a hole in your security. A common approach to solving this is to encrypt the password before storing it. This in itself can lead to security issues since people with appropriate privileges can read the contents of the security tables. When security is managed within applications there is often a need to store passwords in database tables. The maximum number of components in the DECODE function, including expr, searches, results, and default, is 255.Home » Articles » 9i » Here Storing Passwords in an Oracle Database If expr is null, then Oracle returns the result of the first search that is also null. In a DECODE function, Oracle considers two nulls to be equivalent. If the first result has the data type CHAR or if the first result is null, then Oracle converts the return value to the data type VARCHAR2. Oracle automatically converts the return value to the same data type as the first result. Oracle automatically converts expr and each search value to the data type of the first search value before comparing. Consequently, Oracle never evaluates a search if a previous search is equal to expr. The database evaluates each search value only before comparing it to expr, rather than evaluating all search values before comparing any of them with expr. Oracle Database uses short-circuit evaluation. The search, result, and default values can be derived from expressions. If the first search-result pair are numeric, then Oracle compares all search-result expressions and the first expr to determine the argument with the highest numeric precedence, implicitly converts the remaining arguments to that data type, and returns that data type. The string returned is of VARCHAR2 data type and is in the same character set as the first result parameter. expr, search, and result can be any of the data types CHAR, VARCHAR2, NCHAR, or NVARCHAR2. If expr and search are character data, then Oracle compares them using nonpadded comparison semantics. The arguments can be any of the numeric types ( NUMBER, BINARY_FLOAT, or BINARY_DOUBLE) or character types. If default is omitted, then Oracle returns null. If no match is found, then Oracle returns default. If expr is equal to a search, then Oracle Database returns the corresponding result. DECODE compares expr to each search value one by one.
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