NAME
MD4, MD5,
MD4_Init, MD4_Update,
MD4_Final, MD5_Init,
MD5_Update, MD5_Final
— MD4 and MD5 hash
functions
SYNOPSIS
#include
<openssl/md4.h>
unsigned char *
MD4(const unsigned char *d,
unsigned long n, unsigned char
*md);
int
MD4_Init(MD4_CTX *c);
int
MD4_Update(MD4_CTX *c,
const void *data, unsigned long
len);
int
MD4_Final(unsigned char *md,
MD4_CTX *c);
#include
<openssl/md5.h>
unsigned char *
MD5(const unsigned char *d,
unsigned long n, unsigned char
*md);
int
MD5_Init(MD5_CTX *c);
int
MD5_Update(MD5_CTX *c,
const void *data, unsigned long
len);
int
MD5_Final(unsigned char *md,
MD5_CTX *c);
DESCRIPTION
MD4 and MD5 are cryptographic hash functions with a 128-bit output.
MD4()
and
MD5()
compute the MD4 and MD5 message digest of the n bytes
at d and place it in md, which
must have space for MD4_DIGEST_LENGTH
== MD5_DIGEST_LENGTH
== 16 bytes of output. If md
is NULL, the digest is placed in a static array.
The following functions may be used if the message is not completely stored in memory:
MD5_Init()
initializes a MD5_CTX structure.
MD5_Update()
can be called repeatedly with chunks of the message to be hashed
(len bytes at
data).
MD5_Final()
places the message digest in md, which must have space
for MD5_DIGEST_LENGTH == 16
bytes of output, and erases the MD5_CTX.
MD4_Init(),
MD4_Update(),
and
MD4_Final()
are analogous using an MD4_CTX structure.
Applications should use the higher level functions EVP_DigestInit(3) etc. instead of calling these hash functions directly.
RETURN VALUES
MD4() and MD5()
return pointers to the hash value.
MD4_Init(),
MD4_Update(), MD4_Final(),
MD5_Init(), MD5_Update(),
and MD5_Final() return 1 for success or 0
otherwise.
SEE ALSO
STANDARDS
RFC 1320, RFC 1321
HISTORY
MD5(), MD5_Init(),
MD5_Update(), and
MD5_Final() appeared in SSLeay 0.4 or earlier and
have been available since OpenBSD 2.4.
MD4(), MD4_Init(),
MD4_Update(), and
MD4_Final() first appeared in OpenSSL 0.9.6 and have
been available since OpenBSD 2.9.