MD5Init MD5Update MD5Pad MD5Final MD5End MD5File MD5FileChunk MD5Data - calculate the RSA Data Security, Inc., ``MD5'' 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 MD5Final ();
functions are the core functions. Allocate an Vt MD5_CTX , initialize it with MD5Init (,);
run over the data with MD5Update (,);
and finally extract the result using MD5Final (.);
function can be used to pad message data in same way as done by MD5Final ();
without terminating calculation.
function is a wrapper for MD5Final ();
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 MD5End ();
to return the result. If the file cannot be opened, a null pointer is returned. The MD5FileChunk ();
function is similar to MD5File (,);
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, MD5FileChunk ();
calculates the digest from Fa offset to the end of file. The MD5Data ();
function calculates the digest of a chunk of data in memory, and uses MD5End ();
to return the result.
or MD5Data (,);
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) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved.
License to copy and use this software is granted provided that it is identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing this software or this function.
License is also granted to make and use derivative works provided that such works are identified as "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" in all material mentioning or referencing the derived work.
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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