MD2Init MD2Update MD2Pad MD2Final MD2End MD2File MD2FileChunk MD2Data - calculate the RSA Data Security, Inc., ``MD2'' message digest
MD2 is the slowest, MD4 is the fastest and MD5 is somewhere in the middle. MD2 can only be used for Privacy-Enhanced Mail. MD4 has now been broken; it should only be used where necessary for backward compatibility. MD5 has not yet (1999-02-11) been broken, but sufficient attacks have been made that its security is in some doubt. The attacks on both MD4 and MD5 are both in the nature of finding ``collisions'' [en] that is, multiple inputs which hash to the same value; it is still unlikely for an attacker to be able to determine the exact original input given a hash value.
and MD2Final ();
functions are the core functions. Allocate an Vt MD2_CTX , initialize it with MD2Init (,);
run over the data with MD2Update (,);
and finally extract the result using MD2Final (.);
function can be used to pad message data in same way as done by MD2Final ();
without terminating calculation.
function is a wrapper for MD2Final ();
which converts the return value to a 33-character (including the terminating '\0') ASCII string which represents the 128 bits in hexadecimal.
function calculates the digest of a file, and uses MD2End ();
to return the result. If the file cannot be opened, a null pointer is returned. The MD2FileChunk ();
function is similar to MD2File (,);
but it only calculates the digest over a byte-range of the file specified, starting at Fa offset and spanning Fa length bytes. If the Fa length parameter is specified as 0, or more than the length of the remaining part of the file, MD2FileChunk ();
calculates the digest from Fa offset to the end of file. The MD2Data ();
function calculates the digest of a chunk of data in memory, and uses MD2End ();
to return the result.
or MD2Data (,);
the Fa buf argument can be a null pointer, in which case the returned string is allocated with malloc(3) and subsequently must be explicitly deallocated using free(3) after use. If the Fa buf argument is non-null it must point to at least 33 characters of buffer space.
Phk ristede runen.
MD2 has only been licensed for use in Privacy Enhanced Mail. Use MD4 or MD5 if that is not what you are doing. Copyright (C) 1990-2, RSA Data Security, Inc. Created 1990. All rights reserved.
License to copy and use this software is granted for non-commercial Internet Privacy-Enhanced Mail provided that it is identified as the "RSA Data Security, Inc. MD2 Message Digest Algorithm" in all material mentioning or referencing this software or this function.
RSA Data Security, Inc. makes no representations concerning either the merchantability of this software or the suitability of this software for any particular purpose. It is provided "as is" without express or implied warranty of any kind.
These notices must be retained in any copies of any part of this documentation and/or software.
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Created 1996-2021 by Maxim Chirkov
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