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HP Open Source Security for OpenVMS Volume 2:... |
CRYPTO Application Programming Interface (API)... |
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| Description Return Values See Also | Note Conforming To History |
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 output. 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 preferred. 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 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. MD4(), MD4_Init(), and MD4_Update() are available in OpenSSL 0.9.6 and above.
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