MD5. DBMS_CRYPTO. Hash vs java.security.MessageDigest
HelloI have xml in a CLOB column.
I want to get MD5 with DBMS_CRYPTO. Hash:
(Oracle Database 10g Enterprise Edition Release 10.2.0.5.0)
SET SERVEROUTPUT ON
DECLARE
vXml_ CLOB;
tam NUMBER;
l_hash raw(2000);
l_hashCa varchar2(2000);
BEGIN
SELECT COL, dbms_lob.getlength(COL) AS TAMA
INTO vXml_, tam
FROM BORRAME
WHERE ID = 1;
l_hash := DBMS_CRYPTO.Hash (
vXml_,
DBMS_CRYPTO.HASH_MD5);
l_hashCa := lower(rawtohex(l_hash));
dbms_output.put_line('Size: ' || tam);
dbms_output.put_line('Hash: ' || l_hash);
dbms_output.put_line('Hash-1: ' || l_hashCa);
END;
/
Size: 9902
Hash: 36D0C059092B450C0598EBFECC015FF5
Hash-1: 36d0c059092b450c0598ebfecc015ff5Create
SET def off
create or replace java source named "MD5" as
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.sql.Clob;
import java.sql.Blob;
public class MD5 {
public static String getMD5HashFromClob(Clob inhalt) throws Exception{
MessageDigest algorithm;
StringBuffer hexString;
String s;
String salida = null;
int i;
byte[] digest;
String tepFordigest = inhalt.getSubString(1L, (int)inhalt.length());
try {
algorithm = MessageDigest.getInstance("MD5");
algorithm.reset();
algorithm.update(tepFordigest.getBytes());
digest = algorithm.digest();
hexString = new StringBuffer();
for (i = 0; i < digest.length; i++) {
s = "0" + Integer.toHexString(0xFF & digest);
hexString.append(s.substring(s.length() - 2));
}
salida = hexString.toString();
} catch (java.security.NoSuchAlgorithmException nsae) {
salida = "No es posible cifrar MD5";
}
return salida;
}
}
/
sho err
alter java source "MD5" compile
/
sho err
CREATE OR REPLACE FUNCTION get_md5_CLOB(inhalt CLOB) RETURN VARCHAR2 DETERMINISTIC
AS LANGUAGE JAVA
name 'MD5.getMD5HashFromClob(java.sql.Clob) return java.lang.String';
/
Now, i use:
SET SERVEROUTPUT ON
DECLARE
vXml_ CLOB.
TAM NUMBER;
l_hash raw (2000);
l_hashCa varchar2 (2000);
BEGIN
SELECT COL, dbms_lob.getlength (COL) AS TAMA
IN vXml_, tam
OF BORRAME
WHERE ID = 1;
l_hash: = get_md5_CLOB (vXml_);
l_hashCa: = lower (rawtohex (l_hash));
dbms_output.put_line (' size: ': tam);
dbms_output.put_line ('Hash: ' | l_hash);
dbms_output.put_line ('Hash-1: ' | l_hashCa);
END;
/
Size: 9902
Hash: 77E252BC18244BEDDE13072BC3918DBF
Hash-1: 77e252bc18244bedde13072bc3918dbfWhy are they different???:
36d0c059092b450c0598ebfecc015ff5
77e252bc18244bedde13072bc3918dbf
>
Can you think of another mistake?
>
Not an error but the character set used by Java (UTF-16) may be different. The Crypto package always converts all AL32UTF8 before you chop it up, so if the Java character set is different the hash may be different.
If you look at the technical header for DBMS_CRYPTO package it shows it's not:
>
-Front of encryption, hashing or hashing key, the CLOB data type is
-AL32UTF8 converted. This allows cryptographic data
-transferred and between different databases
-Character between the character set change sets, and
-separate processes (for example, Java programs).
--
Tags: Database
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Hi all
SE 12.1
I'm using dbms_crypto. Hash to encrypt the values. But encrypted the returned string is at the top of the case. Calling WebService Im externally requires the proper case... I've seen other ciphers (java-based) hash functions that seem to properly encrypt with a mixture of cases, what I need.
Is it possible to return the string that is encrypted in the proper case.
DECLARE
l_ccn_raw RAW (128);
BEGIN
l_ccn_raw: = utl_raw.cast_to_raw('1234');
l_ccn_raw: = dbms_crypto.hash (l_ccn_raw, dbms_crypto.hash_sh256);
dbms_output.put_line (' TOKEN: ' |) ( l_ccn_raw) ;
END;
You can always try dbms_output.put_line (' TOKEN: ': bass (l_ccn_raw));
But are you sure that you don't need a hashvalue base64-coded?
dbms_output.put_line (' TOKEN: ' | utl_raw.cast_to_varchar2 (utl_encode.base64_encode (l_ccn_raw)));
-
ATG 10.1.2 - Changig AES128-SHA of MD5 hash password
Hi all
We currently use md5 password hash. For some security issues, we need to change it to use AES128-SHA.
Any body can help me what are the need for steps to follow. Thank you
You must write a utility that will do this job for you.
-Remove overlay MD5 and let the user enter their password, then the utility will compare the MD5 hash with code in Pb, if the hash matches then encrypt their password with encryption AES128 and save in the comic book. Mark a flag in the BD so this activity not be made once for each customer.
-Another workaround possible that would be easy, it is that you remove the group all users to do a password reset and superposition of MD5.
Thank you
Adnane
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