Name

MD2, MD5, MD2_Init
MD2_Update, MD2_Final, MD5_Init
MD5_Update, MD5_Final

Cryptographic hash functions with a 128 bit output

Library

libcrypto.lib

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);

Detailed Description

MD2 and MD5 are cryptographic hash functions with a 128 bit output.

MD2() and MD5() compute the MD2, 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 MD5_CTX structure.

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

Notes

MD2 and MD5 are recommended only for compatibility with existing applications. In new applications, SHA-1 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 1320, RFC 1321

See Also

sha(), EVP_DigestInit()

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.

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