void
MD5Init(
MD5_CTX *context
)
void
MD5Update(
MD5_CTX *context
, const unsigned char *data
, unsigned int len
)
void
MD5Final(
unsigned char digest[16]
, MD5_CTX *context
)
char *
MD5End(
MD5_CTX *context
, char *buf
)
char *
MD5File(
const char *filename
, char *buf
)
char *
MD5Data(
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
MD5Init(),
MD5Update(
),
and
MD5Final(
)
functions are the core functions.
Allocate an MD5_CTX, initialize it with
MD5Init(
),
run over the data with
MD5Update(
),
and finally extract the result using
MD5Final(
).
MD5End()
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.
MD5File()
calculates the digest of a file, and uses
MD5End(
)
to return the result.
If the file cannot be opened, a null pointer is returned.
MD5Data(
)
calculates the digest of a chunk of data in memory, and uses
MD5End(
)
to return the result.
When using
MD5End(),
MD5File(
),
or
MD5Data(
),
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.
phk@login.dkuug.dk
>
Phk ristede runen.
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.