Add XOF output support for internal _gcry_md_hash_buffers

* cipher/ecc-eddsa.c (_gcry_ecc_eddsa_compute_h_d, _gcry_ecc_eddsa_sign)
(_gcry_ecc_eddsa_verify): Use same _gcry_md_hash_buffers_extract code
path for SHA512 and SHAKE256.
* cipher/md.c (_gcry_md_hash_buffers): Rename to ...
(_gcry_md_hash_buffers_extract): ... this; Add digestlen and handling
for XOF algorithms (SHAKE128, SHAKE256).
(_gcry_md_hash_buffers): New.
* src/gcrypt-int.h (_gcry_md_hash_buffers_extract): New.
--

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/gcrypt-int.h b/src/gcrypt-int.h
index 858b92ce..9193ebcd 100644
--- a/src/gcrypt-int.h
+++ b/src/gcrypt-int.h
@@ -128,6 +128,10 @@ gpg_err_code_t _gcry_md_extract (gcry_md_hd_t hd, int algo, void *buffer,
                                  size_t length);
 void _gcry_md_hash_buffer (int algo, void *digest,
                            const void *buffer, size_t length);
+gpg_err_code_t _gcry_md_hash_buffers_extract (int algo, unsigned int flags,
+					      void *digest, int digestlen,
+					      const gcry_buffer_t *iov,
+					      int iovcnt);
 gpg_err_code_t _gcry_md_hash_buffers (int algo, unsigned int flags,
                                       void *digest,
                                       const gcry_buffer_t *iov, int iovcnt);