MD2 (3)

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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

and are cryptographic hash functions with a 128 bit output.

(), (), and () compute the and message digest of the n bytes at d and place it in md (which must have space for == == == 16 bytes of output). If md is 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

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

== 16 bytes of output, and erases the .

MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() are analogous using an

and structure.

Applications should use the higher level functions EVP_DigestInit(3) etc. instead of calling the hash functions directly.

NOTE

and are recommended only for compatibility with existing applications. In new applications, or should be preferred.

RETURN VALUES

(), (), and () 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, 0 otherwise.

CONFORMING TO

SEE ALSO

sha(3), ripemd(3), EVP_DigestInit(3)

HISTORY

(), MD2_Init(), MD2_Update() MD2_Final(), (), MD5_Init(), MD5_Update() and MD5_Final() are available in all versions of SSLeay and OpenSSL.

(), MD4_Init(), and MD4_Update() are available in OpenSSL 0.9.6 and above.