MD5

Name

MD5 -- Message Digest-5 algorithm.

Types and Values

Includes

#include <md5.h>

Description

The MD5 algorithm calculates a 128-bit digest of an arbitrary length stream of data. The digest is a fingerprint that can be used to verify the integrity of a transmitted message. The sender and receiver of the message independently calculate the message digest and compare values to ascertain the integrity of the message. The probability of two messages having the same digest is miniscule.

The MD5 algorithm is the intellectual property of RSA Data Security, Inc.

Functions

MD5Init ()

void
MD5Init (MD5_CTX *context);

Initializes MD5 context for the start of message digest computation.

Parameters

context

MD5 context to be initialized.

MD5Update ()

void
MD5Update (MD5_CTX *context,
           unsigned char *input,
           unsigned int inputLen);

MD5 block update operation. Continues an MD5 message-digest operation, processing another message block, and updating the context.

Parameters

context	MD5 context to be updated.
input	pointer to data to be fed into MD5 algorithm.
inputLen	size of `input` data in bytes.

MD5Final ()

void
MD5Final (unsigned char digest[16],
          MD5_CTX *context);

Ends an MD5 message-digest operation, writing the the message digest and zeroing the context. The context must be initialized with MD5Init() before being used for other MD5 checksum calculations.

Parameters

digest	16-byte buffer to write MD5 checksum.
context	MD5 context to be finalized.

Types and Values

MD5_CTX

typedef struct {
  uint32_t state[4];            /* state (ABCD) */
  uint32_t count[2];        	/* number of bits, modulo 2^64 (lsb first) */
  unsigned char buffer[64];     /* input buffer */
} MD5_CTX;

The state for the MD5 calculation.

MD5

Name

Functions

Types and Values

Includes

Description

Functions

MD5Init ()

Parameters

MD5Update ()

Parameters

MD5Final ()

Parameters

Types and Values

MD5_CTX

See Also