Remove dead callbacks in OMEMO plugin

The callbacks aren't used by libomemo-c. The callbacks passed appear to
be buggy because the return value of `gcry_md_read` is passed to `free`,
but it is supposed to be automatically freed on `gcry_md_reset`.
Additionally, `gcry_md_reset` is called before the return value of
`gcry_md_read` is used, which is also against the documentation:

https://www.gnupg.org/documentation/manuals/gcrypt-devel/Working-with-hash-algorithms.html

> `gcry_md_read` returns the message digest after finalizing the
> calculation. […] The returned message digest is allocated within the
> message context and therefore valid until the handle is released or
> reseted (using `gcry_md_close` or `gcry_md_reset`. […]

1 files changed, 0 insertions, 4 deletions

diff --git a/plugins/omemo/src/native/helper.h b/plugins/omemo/src/native/helper.h
index 98c96dfb..3cc21d8a 100644
--- a/plugins/omemo/src/native/helper.h
+++ b/plugins/omemo/src/native/helper.h
@@ -23,10 +23,6 @@ int signal_vala_hmac_sha256_init(void **hmac_context, const uint8_t *key, size_t
 int signal_vala_hmac_sha256_update(void *hmac_context, const uint8_t *data, size_t data_len, void *user_data);
 int signal_vala_hmac_sha256_final(void *hmac_context, signal_buffer **output, void *user_data);
 void signal_vala_hmac_sha256_cleanup(void *hmac_context, void *user_data);
-int signal_vala_sha512_digest_init(void **digest_context, void *user_data);
-int signal_vala_sha512_digest_update(void *digest_context, const uint8_t *data, size_t data_len, void *user_data);
-int signal_vala_sha512_digest_final(void *digest_context, signal_buffer **output, void *user_data);
-void signal_vala_sha512_digest_cleanup(void *digest_context, void *user_data);
 
 int signal_vala_encrypt(signal_buffer **output,
         int cipher,