diff --git a/src/bignum.c b/src/bignum.c
index ef8de31f..e9b95194 100644
--- a/src/bignum.c
+++ b/src/bignum.c
@@ -86,7 +86,7 @@ void ssh_print_bignum(const char *name, const_bignum num)
     if (num != NULL) {
         bignum_bn2hex(num, &hex);
     }
-    fprintf(stderr, "%s value: %s\n", name, (hex == NULL) ? "(null)" : (char *) hex);
+    SSH_LOG(SSH_LOG_DEBUG, "%s value: %s\n", name, (hex == NULL) ? "(null)" : (char *) hex);
 #ifdef HAVE_LIBGCRYPT
     SAFE_FREE(hex);
 #elif defined HAVE_LIBCRYPTO
diff --git a/src/kex.c b/src/kex.c
index d2ee93ba..78a887dd 100644
--- a/src/kex.c
+++ b/src/kex.c
@@ -1235,7 +1235,7 @@ int ssh_make_sessionid(ssh_session session)
                 session->next_crypto->digest_len);
     }
 #ifdef DEBUG_CRYPTO
-    printf("Session hash: \n");
+    SSH_LOG(SSH_LOG_DEBUG, "Session hash: \n");
     ssh_log_hexdump("secret hash", session->next_crypto->secret_hash, session->next_crypto->digest_len);
     ssh_log_hexdump("session id", session->next_crypto->session_id, session->next_crypto->digest_len);
 #endif
diff --git a/src/pki_crypto.c b/src/pki_crypto.c
index 4c95286b..83bf4180 100644
--- a/src/pki_crypto.c
+++ b/src/pki_crypto.c
@@ -1625,7 +1625,7 @@ static int pki_signature_from_rsa_blob(const ssh_key pubkey,
     }
 
 #ifdef DEBUG_CRYPTO
-    SSH_LOG(SSH_LOG_WARN, "RSA signature len: %lu", (unsigned long)len);
+    SSH_LOG(SSH_LOG_DEBUG, "RSA signature len: %lu", (unsigned long)len);
     ssh_log_hexdump("RSA signature", ssh_string_data(sig_blob), len);
 #endif
 
diff --git a/src/pki_mbedcrypto.c b/src/pki_mbedcrypto.c
index 720fe1de..52b298ee 100644
--- a/src/pki_mbedcrypto.c
+++ b/src/pki_mbedcrypto.c
@@ -891,7 +891,7 @@ static ssh_signature pki_signature_from_rsa_blob(const ssh_key pubkey, const
         goto errout;
     }
 #ifdef DEBUG_CRYPTO
-    SSH_LOG(SSH_LOG_WARN, "RSA signature len: %lu", (unsigned long)len);
+    SSH_LOG(SSH_LOG_DEBUG, "RSA signature len: %lu", (unsigned long)len);
     ssh_log_hexdump("RSA signature", ssh_string_data(sig_blob), len);
 #endif