sendme: Do not poke at crypto.sendme_digest directly

As per review from nickm, keep as much as we can the relay_crypto_t object
opaque.

Part of #26288

Signed-off-by: David Goulet <dgoulet@torproject.org>

2 files changed, 9 insertions, 0 deletions

diff --git a/src/core/crypto/relay_crypto.c b/src/core/crypto/relay_crypto.c
index 5be45d6c7a..8931163161 100644
--- a/src/core/crypto/relay_crypto.c
+++ b/src/core/crypto/relay_crypto.c
@@ -91,6 +91,14 @@ relay_crypt_one_payload(crypto_cipher_t *cipher, uint8_t *in)
   crypto_cipher_crypt_inplace(cipher, (char*) in, CELL_PAYLOAD_SIZE);
 }
 
+/** Return the sendme_digest within the <b>crypto</b> object. */
+uint8_t *
+relay_crypto_get_sendme_digest(relay_crypto_t *crypto)
+{
+  tor_assert(crypto);
+  return crypto->sendme_digest;
+}
+
 /** Record the b_digest from <b>crypto</b> and put it in the sendme_digest. */
 void
 relay_crypto_record_sendme_digest(relay_crypto_t *crypto)
diff --git a/src/core/crypto/relay_crypto.h b/src/core/crypto/relay_crypto.h
index 1009f1841b..bcc1531838 100644
--- a/src/core/crypto/relay_crypto.h
+++ b/src/core/crypto/relay_crypto.h
@@ -27,6 +27,7 @@ void relay_crypto_clear(relay_crypto_t *crypto);
 
 void relay_crypto_assert_ok(const relay_crypto_t *crypto);
 
+uint8_t *relay_crypto_get_sendme_digest(relay_crypto_t *crypto);
 void relay_crypto_record_sendme_digest(relay_crypto_t *crypto);
 
 #endif /* !defined(TOR_RELAY_CRYPTO_H) */