MD5 algorithm

Hi! How do I desencrypt using the dbms_obfuscation_toolkit with the MD5 algorithm?
This is my test of encryptation:
ora817 >> DECLARE
  2  --
  3  l_String      VARCHAR2(255) ;
  4  --
  5  BEGIN
  6      --
  7      dbms_obfuscation_toolkit.MD5 (
  8                                      input_string    => 'Oracle' ,
  9                                      checksum_string => l_String
10                                   ) ;
11      --
12      dbms_output.put_line('l_String: '||l_String) ;
13      --
14  END ;
15  /
l_String: 0▬.Î┐l►¸1A▼/─@┬O
PL/SQL procedure successfully completed.Thanks!

Hi,
As I understand it you can't "desencrypt" an MD5 checksum because it's just that -- a checksum.
ie. you can only check the MD5 checksum of a new value to your computed MD5 checksum of the original value to see if the new value is the same as the original value.
Cheers,
Colin

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  • DBMS_CRYPTO MD5 hash value does not match 3rd party MD5 free tool

    Hello,
    I am using Oracle Version: 11.2.4.
    I have a problem where the MD5 value from DBMS_CRYPTO does not match the hash value from 3rd party MD5 free tool (MD5 Checksum Calculator 0.0.5.58 or WinMD5Free v1.20) and also the MD5 hash value calculated by an ingestion tool where I am transferring files to. The MD5 hash value that the ingestion tool calculates is the same as the 3rd party MD5 free tools I have. This occurs only on some of the XML files that I generate using XSQL(xmlserialize, xmlagg, xmlelement, etc.) and DBMS_XSLPROCESSOR on a Linux OS. The XML files are transferred from the Unix OS to my Windows 7 OS via filezilla.
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    create or replace java source named "MD5_UTF_8" as
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    import java.sql.Clob;
    import java.sql.Blob;
    public class MD5_UTF_8 {
    private static final byte [] hexDigit = {
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    * Returns an empty string if the byte array is null
    public static final String toHexString(byte [] bytes) {
    if (bytes == null) return new String("");
    StringBuffer buf = new StringBuffer(bytes.length * 2);
    for (int i = 0; i < bytes.length; i++) {
    buf.append((char) hexDigit[((bytes >>> 4) & 0x0F)]);
    buf.append((char) hexDigit[(bytes & 0x0F)]);
    return buf.toString();
    // Convert Hex String to Byte Array
    public static final byte[] byteArrayFromHexString(String str) {
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    for (int i = 0; i < bytes.length; i++)
    bytes = (byte) Integer.parseInt(str.substring(2 * i, 2 * i + 2), 16);
    return bytes;
    public static String getMD5HashFromClob(Clob inhalt) throws Exception{
    MessageDigest algorithm;
    StringBuffer hexString;
    String s = null;
    String salida = null;
    int i;
    byte[] digest;
    String tepFordigest = inhalt.getSubString(1L, (int)inhalt.length());
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    algorithm = MessageDigest.getInstance("MD5_UTF_8");
    algorithm.reset();
    algorithm.update(tepFordigest.getBytes("UTF-8"));
    digest = algorithm.digest();
    s = toHexString(digest);
    } catch (java.security.NoSuchAlgorithmException nsae) {
    s = "No es posible cifrar MD5";
    return s;
    sho err
    alter java source "MD5_UTF_8" compile
    sho err
    CREATE OR REPLACE FUNCTION get_md5_UTF_8_CLOB(inhalt CLOB) RETURN VARCHAR2 DETERMINISTIC
    AS LANGUAGE JAVA
    name 'MD5_UTF_8.getMD5HashFromClob(java.sql.Clob) return java.lang.String';
    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 {
    private static final byte [] hexDigit = {
    '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
    /** Converts a byte array to a hex string
    * Returns an empty string if the byte array is null
    public static final String toHexString(byte [] bytes) {
    if (bytes == null) return new String("");
    StringBuffer buf = new StringBuffer(bytes.length * 2);
    for (int i = 0; i < bytes.length; i++) {
    buf.append((char) hexDigit[((bytes >>> 4) & 0x0F)]);
    buf.append((char) hexDigit[(bytes & 0x0F)]);
    return buf.toString();
    // Convert Hex String to Byte Array
    public static final byte[] byteArrayFromHexString(String str) {
    byte[] bytes = new byte[str.length() / 2];
    for (int i = 0; i < bytes.length; i++)
    bytes = (byte) Integer.parseInt(str.substring(2 * i, 2 * i + 2), 16);
    return bytes;
    public static String getMD5HashFromClob(Clob inhalt) throws Exception{
    MessageDigest algorithm;
    StringBuffer hexString;
    String s = null;
    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();
    s = toHexString(digest);
    } catch (java.security.NoSuchAlgorithmException nsae) {
    s = "No es posible cifrar MD5";
    return s;
    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';
    I created the above java functions and added the calls to them in my package to see what hash values they would produce but I am getting "ORA-29532: Java call terminated by uncaught Java exception: java.nio.BufferOverflowException " the XML is about 60mb.
    package code sniippets:
    declare
    l_hash raw(2000);
    l_checksum_md5 varchar2(2000);
    l_checksum_md5_utf_8 varchar2(2000);
    Begin
    t_checksum := lower(RAWTOHEX(dbms_crypto.hash(src=>l_clob,typ=>dbms_crypto.hash_md5)));
    l_hash := get_md5_CLOB (l_clob);
    l_checksum_md5 := lower(rawtohex(l_hash));
    l_hash := get_md5_UTF_8_CLOB (l_clob);
    l_checksum_md5_UTF_8 := lower(rawtohex(l_hash));Please help,
    Thank You in advance
    Don
    Edited by: 972551 on Nov 21, 2012 12:18 PM
    Edited by: sabre150 on Nov 21, 2012 11:06 PM
    Moderator action : added [code ] tags to format properly. In future please add them yourself.

    >
    I have a problem where the MD5 value from DBMS_CRYPTO does not match the hash value from 3rd party MD5 free tool (MD5 Checksum Calculator 0.0.5.58 or WinMD5Free v1.20) and also the MD5 hash value calculated by an ingestion tool where I am transferring files to. The MD5 hash value that the ingestion tool calculates is the same as the 3rd party MD5 free tools I have.
    I found a thread on this forum that also had a similar issue so I copy/paste the java functions.
    >
    And in that thread (Re: MD5 HASH computed from DBMS_CRYPTO does not match .NET MD5 I provided the reason why DBMS_CRYPTO may not match hashes produced by other methodologies.
    I have no idea why you copied and posted all of that Java code the other poster and I provided since code has NOTHING to do with the problem you say you are having. Thte other poster's question was how to write Java code that would produce the same result as DBMS_CRYPTO.
    You said your problem was understanding why DBMS_CRYPTO 'does not match the hash value from 3rd party MD5 free tool ...'. and I answered that in the other forum.
    >
    The Crypto package always converts everything to AL32UTF8 before hashing so if the .NET character set is different the hash will likely be different.
    See DBMS_CRYPTO in the PL/SQL Packages and Types doc
    http://docs.oracle.com/cd/B28359_01/appdev.111/b28419/d_crypto.htm
    If you look at the spec header for the DBMS_CRYPTO package it shows this note:
    -- Prior to encryption, hashing or keyed hashing, CLOB datatype is
    -- converted to AL32UTF8. This allows cryptographic data to be
    -- transferred and understood between databases with different
    -- character sets, across character set changes and between
    -- separate processes (for example, Java programs).
    -- If your 3rd party MD5 free tool (MD5 Checksum Calculator 0.0.5.58 or WinMD5Free v1.20) do not use the AL32UTF8 character set then the hashes will likely be different. You can't modify DBMS_CRYPTO so if the hashes need to match you need to use 3rd party tools that either use the correct character set or can be configured to use the correct character set.
    The problem in the other thread was how to WRITE Java code that uses the correct character set and I showed that OP how to do that.
    So unless you are writing your own Java code all of that code you copied and pasted is useless for your use case.

  • DBMS_CRYTPO MD5 value does NOT match 3rd party MD5 tools

    Hello,
    I am using Oracle Version: 11.2.4.
    I have a problem where the MD5 value from DBMS_CRYPTO does not match the hash value from 3rd party MD5 free tool (MD5 Checksum Calculator 0.0.5.58 or WinMD5Free v1.20) and also the MD5 hash value calculated by an ingestion tool where I am transferring files to. The MD5 hash value that the ingestion tool calculates is the same as the 3rd party MD5 free tools I have. This occurs only on some of the XML files that I generate using XSQL(xmlserialize, xmlagg, xmlelement, etc.) and DBMS_XSLPROCESSOR on a Linux OS. The XML files are transferred from the Unix OS to my Windows 7 OS via filezilla.
    I found a thread on this forum that also had a similar issue so I copy/paste the java functions. They are listed below(both are the same expect for the character set):
    create or replace java source named "MD5_UTF_8" as
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    import java.sql.Clob;
    import java.sql.Blob;
    public class MD5_UTF_8 {
    private static final byte [] hexDigit = {
         '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
    /** Converts a byte array to a hex string
    * Returns an empty string if the byte array is null
    public static final String toHexString(byte [] bytes) {
    if (bytes == null) return new String("");
    StringBuffer buf = new StringBuffer(bytes.length * 2);
    for (int i = 0; i < bytes.length; i++) {
    buf.append((char) hexDigit[((bytes[i] >>> 4) & 0x0F)]);
    buf.append((char) hexDigit[(bytes[i] & 0x0F)]);
    return buf.toString();
    // Convert Hex String to Byte Array
    public static final byte[] byteArrayFromHexString(String str) {
    byte[] bytes = new byte[str.length() / 2];
    for (int i = 0; i < bytes.length; i++)
    bytes[i] = (byte) Integer.parseInt(str.substring(2 * i, 2 * i + 2), 16);
    return bytes;
    public static String getMD5HashFromClob(Clob inhalt) throws Exception{
    MessageDigest algorithm;
    StringBuffer hexString;
    String s = null;
    String salida = null;
    int i;
    byte[] digest;
    String tepFordigest = inhalt.getSubString(1L, (int)inhalt.length());
    try {
    algorithm = MessageDigest.getInstance("MD5_UTF_8");
    algorithm.reset();
    algorithm.update(tepFordigest.getBytes("UTF-8"));
    digest = algorithm.digest();
    s = toHexString(digest);
    } catch (java.security.NoSuchAlgorithmException nsae) {
    s = "No es posible cifrar MD5";
    return s;
    sho err
    alter java source "MD5_UTF_8" compile
    sho err
    CREATE OR REPLACE FUNCTION get_md5_UTF_8_CLOB(inhalt CLOB) RETURN VARCHAR2 DETERMINISTIC
    AS LANGUAGE JAVA
    name 'MD5_UTF_8.getMD5HashFromClob(java.sql.Clob) return java.lang.String';
    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 {
    private static final byte [] hexDigit = {
         '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'
    /** Converts a byte array to a hex string
    * Returns an empty string if the byte array is null
    public static final String toHexString(byte [] bytes) {
    if (bytes == null) return new String("");
    StringBuffer buf = new StringBuffer(bytes.length * 2);
    for (int i = 0; i < bytes.length; i++) {
    buf.append((char) hexDigit[((bytes[i] >>> 4) & 0x0F)]);
    buf.append((char) hexDigit[(bytes[i] & 0x0F)]);
    return buf.toString();
    // Convert Hex String to Byte Array
    public static final byte[] byteArrayFromHexString(String str) {
    byte[] bytes = new byte[str.length() / 2];
    for (int i = 0; i < bytes.length; i++)
    bytes[i] = (byte) Integer.parseInt(str.substring(2 * i, 2 * i + 2), 16);
    return bytes;
    public static String getMD5HashFromClob(Clob inhalt) throws Exception{
    MessageDigest algorithm;
    StringBuffer hexString;
    String s = null;
    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();
    s = toHexString(digest);
    } catch (java.security.NoSuchAlgorithmException nsae) {
    s = "No es posible cifrar MD5";
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    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';
    I created the above java functions and added the calls to them in my package to see what hash values they would produce but I am getting "ORA-29532: Java call terminated by uncaught Java exception: java.nio.BufferOverflowException " the XML is about 60mb.
    package code sniippets:
    declare
    l_hash raw(2000);
    l_checksum_md5 varchar2(2000);
    l_checksum_md5_utf_8 varchar2(2000);
    Begin
    t_checksum := lower(RAWTOHEX(dbms_crypto.hash(src=>l_clob,typ=>dbms_crypto.hash_md5)));
    l_hash := get_md5_CLOB (l_clob);
    l_checksum_md5 := lower(rawtohex(l_hash));
    l_hash := get_md5_UTF_8_CLOB (l_clob);
    l_checksum_md5_UTF_8 := lower(rawtohex(l_hash));
    Please help,
    Thank You in advance
    Don
    Edited by: 972551 on Nov 21, 2012 12:45 PM

    Thanks for the reply but my syntax is correct.
    t_checksum := lower(RAWTOHEX(dbms_crypto.hash(src=>l_clob,typ=>dbms_crypto.hash_md5)));
    The typ argument tells dbms_crypto what type of hash value to produce.
    This is from the Oracle Docs:
    Table 24-3 DBMS_CRYPTO Cryptographic Hash Functions
    Name      Description
    HASH_MD4 Produces a 128-bit hash, or message digest of the input message
    HASH_MD5 Also produces a 128-bit hash, but is more complex than MD4
    HASH_SH1 Secure Hash Algorithm (SHA). Produces a 160-bit hash.
    for further details see: http://docs.oracle.com/cd/B19306_01/appdev.102/b14258/d_crypto.htm#i1002022
    Edited by: 972551 on Nov 21, 2012 12:46 PM

  • Problem using md5

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    The output of the digest is an array of bytes which in general will not convert to a String since, depending on the encoding, not all byte combinations are valid characters.
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  • How to decrypt MD5 data

    Hi,
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    Thanks In Advance,

    I'm making some assumptions based on the limited info you have provided...
    You are trying to log into a webapp, the user supplies a username/password so you have both in plaintext.
    You are getting the stored password from the webapp's storage and it is coming out in "MD5" format because it was digested when it was stored.
    What you need to do is digest (aka hash) the user-supplied password using the MD5 algorithm and compare the result with what was taken from storage. If they match, the password is correct and let the user in, if not, reject the login attempt.
    simplified steps:
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    - user foo tries to login and supplies "cat" as the password, webapp pulls the stored password for foo out (286755fad04869ca523320acce0dc6a4) and then digests what the user just passed in "cat" and gets 54b8617eca0e54c7d3c8e6732c6b687a
    does 54b8617eca0e54c7d3c8e6732c6b687a = 286755fad04869ca523320acce0dc6a4? NO, don't let user in.
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    does 286755fad04869ca523320acce0dc6a4 = 286755fad04869ca523320acce0dc6a4? YES, let user in.

  • MD5 - compare String doesn't work ???? I turn crazy !! Help Pleeeeaaaase :-

    Hi guys,
    cut and paste this piece of code, run it and the outcome will be false !!!
    // BEGIN ----------
    String binary = "PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4NCg==";               
    String md5sum = "�����;����V?v�";               
    MessageDigest algoMD5 = MessageDigest.getInstance( "MD5" );          
    algoMD5.update(binary.getBytes());
    byte b[] = algoMD5.digest();
    String tmp = new String(b);
    System.out.println("*"+md5sum+"*");
    System.out.println("*"+tmp+"*");
    // On the console, both Strings are exactly the same !!!!
    boolean ok = md5sum.equals(tmp);
    // ok is FALSE !!!
    // END ----------
    WHY ???
    WHY ???
    WHY ???
    WHY ???
    Help please ! Thank you !

    The example below (pulled from code that was checking streams, so probably errors in it) will show you why you are getting not equals.
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    public class MD5EqualsTest {
        public static void main(String[] args) {
            String binary = "PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4NCg==";
            String md5sum = "�����;����V?v�";
            MD5Checker checker = new MD5Checker();
            checker.verifyMD5Hash(binary, md5sum);
    class MD5Checker {
        /** Constant for the buffer size to use in the MD5 calculation. */
        private static final int BUFFER_SIZE = 250000;
        HexWriter hexDumper = new HexWriter();
        public void verifyMD5Hash(String str, String hashToTest) {
            // Setup the digest input to use the md5 algorithm
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            try {
                md5 = MessageDigest.getInstance("MD5");
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            System.out.println("mdString:" + mdString);
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            if (!mdString.equals(mdToTest)) {
                System.out.println("Not the same");
            } else {
                System.out.println("Hashes are the same");
        final class HexWriter {
            /** Character array containing all valid hex digits. */
            private final char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6',
                    '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', };
            public String dumpString(byte[] data) {
                if (data == null) { return "null"; }
                StringBuffer sb = new StringBuffer();
                int dataLen = data.length;
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  • MD5 Whats is this MD5 URGENT!!!!!!

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    Siva.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   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