* cipher/mac-hmac.c (map_mac_algo_to_md): Add mapping for SHA512/224
and SHA512/256.
(_gcry_mac_type_spec_hmac_sha512_256)
(_gcry_mac_type_spec_hmac_sha512_224): New.
* cipher/mac-internal.h (_gcry_mac_type_spec_hmac_sha512_256)
(_gcry_mac_type_spec_hmac_sha512_224): New.
* cipher/mac.c (mac_list, mac_list_algo101): Add SHA512/224 and
SHA512/256.
* cipher/md.c (digest_list, digest_list_algo301)
(prepare_macpads): Ditto.
* cipher/sha512.c (run_selftests): Ditto.
(sha512_init_common): Move common initialization here.
(sha512_init, sha384_init): Use common initialization function.
(sha512_224_init, sha512_256_init, _gcry_sha512_224_hash_buffer)
(_gcry_sha512_224_hash_buffers, _gcry_sha512_256_hash_buffer)
(_gcry_sha512_256_hash_buffers, selftests_sha512_224)
(selftests_sha512_256, sha512_224_asn, oid_spec_sha512_224)
(_gcry_digest_spec_sha512_224, sha512_256_asn, oid_spec_sha512_256)
(_gcry_digest_spec_sha512_256): New.
* doc/gcrypt.texi: Add SHA512/224 and SHA512/256; Add missing
HMAC-BLAKE2s and HMAC-BLAKE2b.
* src/cipher.h (_gcry_digest_spec_sha512_224)
(_gcry_digest_spec_sha512_256): New.
* src/gcrypt.h.in (GCRY_MD_SHA512_256, GCRY_MD_SHA512_224): New.
(GCRY_MAC_HMAC_SHA512_256, GCRY_MAC_HMAC_SHA512_224): New.
* tests/basic.c (check_digests): Add SHA512/224 and SHA512/256
test vectors.