md4.h

All headers

MD4.

MD4 is not a secure hash function. There are very efficient attacks for finding collisions, and its preimage resistance is also broken. It is implemented purely for compatibility with legacy systems.

Use a secure hash function, such as SHA-256, instead.

  1. MD4_CBLOCK
  2. MD4_DIGEST_LENGTH
  3. MD4_Init
  4. MD4_Update
  5. MD4_Final
  6. MD4
  7. MD4_Transform
  8. md4_state_st

MD4_CBLOCK is the block size of MD4.

#define MD4_CBLOCK 64

MD4_DIGEST_LENGTH is the length of an MD4 digest.

#define MD4_DIGEST_LENGTH 16

MD4_Init initialises md4 and returns one.

OPENSSL_EXPORT int MD4_Init(MD4_CTX *md4);

MD4_Update adds len bytes from data to md4 and returns one.

OPENSSL_EXPORT int MD4_Update(MD4_CTX *md4, const void *data, size_t len);

MD4_Final adds the final padding to md4 and writes the resulting digest to out, which must have at least MD4_DIGEST_LENGTH bytes of space. It returns one.

OPENSSL_EXPORT int MD4_Final(uint8_t out[MD4_DIGEST_LENGTH], MD4_CTX *md4);

MD4 writes the digest of len bytes from data to out and returns out. There must be at least MD4_DIGEST_LENGTH bytes of space in out.

OPENSSL_EXPORT uint8_t *MD4(const uint8_t *data, size_t len,
                            uint8_t out[MD4_DIGEST_LENGTH]);

MD4_Transform is a low-level function that performs a single, MD4 block transformation using the state from md4 and 64 bytes from block.

OPENSSL_EXPORT void MD4_Transform(MD4_CTX *md4,
                                  const uint8_t block[MD4_CBLOCK]);
struct md4_state_st {
  uint32_t h[4];
  uint32_t Nl, Nh;
  uint8_t data[MD4_CBLOCK];
  unsigned num;
};