Fix cipher property NIDs for SSL_get_current_cipher and add PSK kx mapping

src/internal.c

@@ -28749,6 +28749,20 @@ const char* GetCipherSegment(const WOLFSSL_CIPHER* cipher, char n[][MAX_SEGMENT_
 
     offset = cipher->offset;
 
+    /* offset is not set via wolfSSL_get_current_cipher(), so resolve it from
+     * the always-populated suite bytes. */
+    for (i = 0; i < GetCipherNamesSize(); i++) {
+        if (cipher_names[i].cipherSuite0 == cipher->cipherSuite0 &&
+            cipher_names[i].cipherSuite  == cipher->cipherSuite
+        #ifndef NO_CIPHER_SUITE_ALIASES
+            && (!(cipher_names[i].flags & WOLFSSL_CIPHER_SUITE_FLAG_NAMEALIAS))
+        #endif
+            ) {
+            offset = (unsigned long)i;
+            break;
+        }
+    }
+
     if (offset >= (unsigned long)GetCipherNamesSize())
         return NULL;
 

src/ssl.c

@@ -11321,6 +11321,7 @@ int wolfSSL_CIPHER_get_kx_nid(const WOLFSSL_CIPHER* cipher)
         {"RSAPSK",    WC_NID_kx_rsa_psk},
         {"SRP",       WC_NID_kx_srp},
         {"EDH",       WC_NID_kx_dhe},
+        {"PSK",       WC_NID_kx_psk},
         {"RSA",       WC_NID_kx_rsa},
         {NULL,        WC_NID_undef}
     };

tests/api.c

@@ -28172,6 +28172,46 @@ static int test_SSL_CIPHER_get_xxx(void)
     return EXPECT_RESULT();
 }
 
+/* Cipher property helpers must report the negotiated cipher when it is
+ * obtained via SSL_get_current_cipher(), which does not populate
+ * cipher->offset. */
+static int test_SSL_CIPHER_get_current_kx(void)
+{
+    EXPECT_DECLS;
+#if defined(OPENSSL_ALL) && !defined(NO_TLS) && \
+    defined(BUILD_TLS_PSK_WITH_AES_128_GCM_SHA256)
+    SSL_CTX* ctx = NULL;
+    SSL*     ssl = NULL;
+    const SSL_CIPHER* cipher = NULL;
+
+#ifndef NO_WOLFSSL_CLIENT
+    ExpectNotNull(ctx = wolfSSL_CTX_new(wolfSSLv23_client_method()));
+#else
+    ExpectNotNull(ctx = wolfSSL_CTX_new(wolfSSLv23_server_method()));
+#endif
+    ExpectNotNull(ssl = SSL_new(ctx));
+
+    /* Set a negotiated plain-PSK suite without a full handshake. */
+    if (ssl != NULL) {
+        ssl->options.cipherSuite0 = CIPHER_BYTE;
+        ssl->options.cipherSuite  = TLS_PSK_WITH_AES_128_GCM_SHA256;
+    }
+
+    ExpectNotNull(cipher = SSL_get_current_cipher(ssl));
+    ExpectStrEQ(SSL_CIPHER_get_name(cipher), "TLS_PSK_WITH_AES_128_GCM_SHA256");
+    ExpectIntEQ(wolfSSL_CIPHER_get_kx_nid(cipher), NID_kx_psk);
+    ExpectIntEQ(wolfSSL_CIPHER_get_auth_nid(cipher), NID_auth_psk);
+    ExpectIntEQ(wolfSSL_CIPHER_get_cipher_nid(cipher), NID_aes_128_gcm);
+    ExpectIntEQ(wolfSSL_CIPHER_get_digest_nid(cipher), NID_sha256);
+    ExpectIntEQ(wolfSSL_CIPHER_is_aead(cipher), 1);
+
+    SSL_free(ssl);
+    SSL_CTX_free(ctx);
+#endif
+
+    return EXPECT_RESULT();
+}
+
 #if defined(WOLF_CRYPTO_CB) && defined(HAVE_IO_TESTS_DEPENDENCIES) && \
     (!defined(WOLF_CRYPTO_CB_ONLY_SHA256) && !defined(WOLF_CRYPTO_CB_ONLY_AES) && \
      !defined(WOLF_CRYPTO_CB_ONLY_ECC) && !defined(WOLF_CRYPTO_CB_ONLY_RSA))
@@ -34955,6 +34995,7 @@ TEST_CASE testCases[] = {
     TEST_DECL(test_wolfSSL_get_peer_finished_overrun),
 #endif
     TEST_DECL(test_SSL_CIPHER_get_xxx),
+    TEST_DECL(test_SSL_CIPHER_get_current_kx),
     TEST_DECL(test_wolfSSL_ERR_strings),
     TEST_DECL(test_wolfSSL_CTX_set_cipher_list_bytes),
     TEST_DECL(test_wolfSSL_set_cipher_list_tls12_keeps_tls13),