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MD5

MD5

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);

void MD2_Init(MD2_CTX *c);
void MD2_Update(MD2_CTX *c, const unsigned char *data,
unsigned long len);
void 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);

void MD4_Init(MD4_CTX *c);
void MD4_Update(MD4_CTX *c, const void *data,
unsigned long len);
void 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);

void MD5_Init(MD5_CTX *c);
void MD5_Update(MD5_CTX *c, const void *data,
unsigned long len);
void MD5_Final(unsigned char *md, MD5_CTX *c);

DESCRIPTION

MD2, MD4, and MD5 are cryptographic hash functions with a 128 bit out-
put.

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 the hash functions directly.

NOTE

MD2, MD4, and MD5 are recommended only for compatibility with existing
applications. In new applications, SHA-1 or RIPEMD-160 should be pre-
ferred.

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() do not return
values.

CONFORMING TO

RFC 1319, RFC 1320, RFC 1321

EOF

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