MD4(3) | Library Functions Manual | MD4(3) |
MD4Init
, MD4Update
,
MD4Final
, MD4End
,
MD4File
, MD4Data
—
#include <sys/types.h>
#include <md4.h>
void
MD4Init
(MD4_CTX
*context);
void
MD4Update
(MD4_CTX
*context, const unsigned
char *data, unsigned int
len);
void
MD4Final
(unsigned
char digest[16], MD4_CTX
*context);
char *
MD4End
(MD4_CTX
*context, char
*buf);
char *
MD4File
(const
char *filename, char
*buf);
char *
MD4Data
(const
unsigned char *data,
unsigned int len,
char *buf);
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 been criticized for being too weak, so MD5 was developed in response as ``MD4 with safety-belts''. When in doubt, use MD5.
The MD4Init
(),
MD4Update
(), and MD4Final
()
functions are the core functions. Allocate an MD4_CTX, initialize it with
MD4Init
(), run over the data with
MD4Update
(), and finally extract the result using
MD4Final
().
MD4End
() is a wrapper for
MD4Final
() which converts the return value to a
33-character (including the terminating '\0') ASCII string which represents
the 128 bits in hexadecimal.
MD4File
() calculates the digest of a file,
and uses MD4End
() to return the result. If the file
cannot be opened, a null pointer is returned.
MD4Data
() calculates the digest of a chunk of data
in memory, and uses MD4End
() to return the
result.
When using MD4End
(),
MD4File
(), or MD4Data
(), the
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
buf argument is non-null it must point to at least 33
characters of buffer space.
B. Kaliski, The MD2 Message-Digest Algorithm, RFC 1319.
R. Rivest, The MD4 Message-Digest Algorithm, RFC 1186.
R. Rivest, The MD5 Message-Digest Algorithm, RFC 1321.
RSA Laboratories, Frequently Asked Questions About today's Cryptography.
Phk ristede runen.
License to copy and use this software is granted provided that it is identified as the "RSA Data Security, Inc. MD4 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. MD4 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.
May 22, 2018 | NetBSD 9.2 |