md5

NAME
SYNOPSIS
DESCRIPTION
NOTE
RETURN VALUES
CONFORMING TO
SEE ALSO
HISTORY

NAME

MD2, MD5, MD2_Init, MD2_Update, MD2_Final, MD5_Init, MD5_Update, MD5_Final − MD2 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/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 and MD5 are cryptographic hash functions with a 128 bit output.

MD2() and MD5() compute the MD2 and MD5 message digest of the n bytes at d and place it in md (which must have space for MD2_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.

MD5_Init(), MD5_Update() and MD5_Final() are analogous using an MD5_CTX structure.

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

NOTE

MD2 and MD5 are recommended only for compatibility with existing applications. In new applications, SHA−1 or RIPEMD−160 should be preferred.

RETURN VALUES

MD2() and MD5() return pointers to the hash value.

MD2_Init(), MD2_Update() MD2_Final(), MD5_Init(), MD5_Update() and MD5_Final() do not return values.

CONFORMING TO

RFC 1319, RFC 1321

SEE ALSO

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

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.

MD5_Final - MD2 and MD5 hash functions"