void
RMD160Init(RMD160_CTX *context)
void
RMD160Update(RMD160_CTX *context, const u_char *data, u_int nbytes)
void
RMD160Final(u_char digest[20], RMD160_CTX *context)
void
RMD160Transform(uint32_t state[5], const uint32_t block[16])
char *
RMD160End(RMD160_CTX *context, char *buf)
char *
RMD160File(char *filename, char *buf)
char *
RMD160Data(u_char *data, size_t len, char *buf)
The RMD160 functions are considered to be more secure than the md4(3) and md5(3) functions and at least as secure as the sha1(3) function. All share a similar interface.
The
RMD160Init()
function initializes a RMD160_CTX
context
for use with
RMD160Update(),
and
RMD160Final().
The
RMD160Update()
function adds
data
of length
nbytes
to the RMD160_CTX specified by
context.
RMD160Final()
is called when all data has been added via
RMD160Update()
and stores a message digest in the
digest
parameter.
When a null pointer is passed to
RMD160Final()
as first argument only the final padding will be applied and the
current context can still be used with
RMD160Update().
The
RMD160Transform()
function is used by
RMD160Update()
to hash 512-bit blocks and forms the core of the algorithm.
Most programs should use the interface provided by
RMD160Init(),
RMD160Update()
and
RMD160Final()
instead of calling
RMD160Transform()
directly.
The
RMD160End()
function is a front end for
RMD160Final()
which converts the digest into an
ASCII
representation of the 160 bit digest in hexadecimal.
The
RMD160File()
function calculates the digest for a file and returns the result via
RMD160End().
If
RMD160File()
is unable to open the file a NULL pointer is returned.
The
RMD160Data()
function
calculates the digest of an arbitrary string and returns the result via
RMD160End().
For each of the
RMD160End(),
RMD160File(),
and
RMD160Data()
functions the
buf
parameter should either be a string of at least 41 characters in
size or a NULL pointer.
In the latter case, space will be dynamically allocated via
malloc(3)
and should be freed using
free(3)
when it is no longer needed.
RMD160_CTX rmd;
u_char results[20];
char *buf;
int n;
buf = "abc";
n = strlen(buf);
RMD160Init(&rmd);
RMD160Update(&rmd, (u_char *)buf, n);
RMD160Final(results, &rmd);
/* Print the digest as one long hex value */
printf("0x");
for (n = 0; n < 20; n++)
printf("%02x", results[n]);
putchar('\n');
Alternately, the helper functions could be used in the following way:
RMD160_CTX rmd;
u_char output[41];
char *buf = "abc";
printf("0x%s\n", RMD160Data(buf, strlen(buf), output));
The
RMD160End(),
RMD160File(),
and
RMD160Data()
helper functions are derived from code written by Poul-Henning Kamp.