struct hash_alg

struct hash_alg_common
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struct hash_alg_common — define properties of message digest

struct hash_alg_common {
  unsigned int digestsize;
  unsigned int statesize;
  struct crypto_alg base;
};

digestsize: Size of the result of the transformation. A buffer of this size must be available to the final and finup calls, so they can store the resulting hash into it. For various predefined sizes, search include/crypto/ using git grep _DIGEST_SIZE include/crypto.
statesize: Size of the block for partial state of the transformation. A buffer of this size must be passed to the export function as it will save the partial state of the transformation into it. On the other side, the import function will load the state from a buffer of this size as well.
base: Start of data structure of cipher algorithm. The common data structure of crypto_alg contains information common to all ciphers. The hash_alg_common data structure now adds the hash-specific information.