MDC2 is a method to construct hash functions with 128 bit output from
block ciphers. These functions are an implementation of MDC2 with
MDC2() computes the MDC2 message digest of the n
bytes at d and places it in md (which must have space for
MDC2_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:
MDC2_Init() initializes a MDC2_CTX structure.
MDC2_Update() can be called repeatedly with chunks of the message to
be hashed (len bytes at data).
MDC2_Final() places the message digest in md, which must have space
for MDC2_DIGEST_LENGTH == 16 bytes of output, and erases the MDC2_CTX.
Applications should use the higher level functions
EVP_DigestInit(3) etc. instead of calling the
hash functions directly.