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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"


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