NAME
MD2, MD4,
MD5, MD2_Init,
MD2_Update, MD2_Final,
MD4_Init, MD4_Update,
MD4_Final, MD5_Init,
MD5_Update, MD5_Final
— MD2, MD4, and MD5 hash
functions
SYNOPSIS
#include
<openssl/md2.h>
unsigned char *
MD2(const unsigned char *d,
unsigned long n, unsigned char
*md);
int
MD2_Init(MD2_CTX *c);
int
MD2_Update(MD2_CTX *c,
const unsigned char *data, unsigned
long len);
int
MD2_Final(unsigned char *md,
MD2_CTX *c);
#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
MD2, MD4, and MD5 are cryptographic hash functions with a 128-bit output.
MD2(),
MD4(),
and
MD5()
compute the MD2, MD4, and MD5 message digest of the n
bytes at d and place it in md,
which must have space for MD2_DIGEST_LENGTH
== 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:
MD2_Init()
initializes a MD2_CTX structure.
MD2_Update()
can be called repeatedly with chunks of the message to be hashed
(len bytes at
data).
MD2_Final()
places the message digest in md, which must have space
for MD2_DIGEST_LENGTH == 16
bytes of output, and erases the MD2_CTX.
MD4_Init(),
MD4_Update(),
MD4_Final(),
MD5_Init(),
MD5_Update(),
and
MD5_Final()
are analogous using an MD4_CTX and
MD5_CTX structure.
Applications should use the higher level functions EVP_DigestInit(3) etc. instead of calling these hash functions directly.
RETURN VALUES
MD2(), MD4(), and
MD5() return pointers to the hash value.
MD2_Init(),
MD2_Update(), MD2_Final(),
MD4_Init(), MD4_Update(),
MD4_Final(), MD5_Init(),
MD5_Update(), and
MD5_Final() return 1 for success or 0 otherwise.
SEE ALSO
STANDARDS
RFC 1319, RFC 1320, RFC 1321
HISTORY
MD2(), MD2_Init(),
MD2_Update(), MD2_Final(),
MD5(), MD5_Init(),
MD5_Update(), and
MD5_Final() are available in all versions of SSLeay
and OpenSSL.
MD4(), MD4_Init(),
and MD4_Update() are available in OpenSSL 0.9.6 and
above.