bcrypt: Fix RSA public key export when we don't have a private key handle.

dlls/bcrypt/gnutls.c

@@ -107,6 +107,7 @@ static int (*pgnutls_pubkey_import_dsa_raw)(gnutls_pubkey_t, const gnutls_datum_
 static int (*pgnutls_pubkey_import_privkey)(gnutls_pubkey_t, gnutls_privkey_t, unsigned int, unsigned int);
 
 /* Not present in gnutls version < 3.3.0 */
+static int (*pgnutls_pubkey_export_rsa_raw)(gnutls_pubkey_t, gnutls_datum_t *, gnutls_datum_t *);
 static int (*pgnutls_privkey_export_ecc_raw)(gnutls_privkey_t, gnutls_ecc_curve_t *,
                                              gnutls_datum_t *, gnutls_datum_t *, gnutls_datum_t *);
 static int (*pgnutls_privkey_export_rsa_raw)(gnutls_privkey_t, gnutls_datum_t *, gnutls_datum_t *, gnutls_datum_t *,
@@ -166,6 +167,11 @@ static int compat_gnutls_pubkey_export_ecc_raw(gnutls_pubkey_t key, gnutls_ecc_c
     return GNUTLS_E_UNKNOWN_PK_ALGORITHM;
 }
 
+static int compat_gnutls_pubkey_export_rsa_raw(gnutls_pubkey_t key, gnutls_datum_t *m, gnutls_datum_t *e)
+{
+    return GNUTLS_E_UNKNOWN_PK_ALGORITHM;
+}
+
 static int compat_gnutls_privkey_export_rsa_raw(gnutls_privkey_t key, gnutls_datum_t *m, gnutls_datum_t *e,
                                                 gnutls_datum_t *d, gnutls_datum_t *p, gnutls_datum_t *q,
                                                 gnutls_datum_t *u, gnutls_datum_t *e1, gnutls_datum_t *e2)
@@ -299,8 +305,9 @@ static NTSTATUS gnutls_process_attach( void *args )
 
     LOAD_FUNCPTR_OPT(gnutls_cipher_tag)
     LOAD_FUNCPTR_OPT(gnutls_cipher_add_auth)
-    LOAD_FUNCPTR_OPT(gnutls_pubkey_import_ecc_raw)
     LOAD_FUNCPTR_OPT(gnutls_pubkey_export_ecc_raw)
+    LOAD_FUNCPTR_OPT(gnutls_pubkey_export_rsa_raw)
+    LOAD_FUNCPTR_OPT(gnutls_pubkey_import_ecc_raw)
     LOAD_FUNCPTR_OPT(gnutls_privkey_export_rsa_raw)
     LOAD_FUNCPTR_OPT(gnutls_privkey_export_ecc_raw)
     LOAD_FUNCPTR_OPT(gnutls_privkey_import_ecc_raw)
@@ -633,7 +640,14 @@ static NTSTATUS key_export_rsa_public( struct key *key, UCHAR *buf, ULONG len, U
     UCHAR *dst;
     int ret;
 
-    if ((ret = pgnutls_privkey_export_rsa_raw( key_data(key)->a.privkey, &m, &e, NULL, NULL, NULL, NULL, NULL, NULL )))
+    if (key_data(key)->a.pubkey)
+        ret = pgnutls_pubkey_export_rsa_raw( key_data(key)->a.pubkey, &m, &e );
+    else if (key_data(key)->a.privkey)
+        ret = pgnutls_privkey_export_rsa_raw( key_data(key)->a.privkey, &m, &e, NULL, NULL, NULL, NULL, NULL, NULL );
+    else
+        return STATUS_INVALID_PARAMETER;
+
+    if (ret)
     {
         pgnutls_perror( ret );
         return STATUS_INTERNAL_ERROR;
@@ -1017,6 +1031,8 @@ static NTSTATUS key_export_rsa( struct key *key, ULONG flags, UCHAR *buf, ULONG
     UCHAR *dst;
     int ret;
 
+    if (!key_data(key)->a.privkey) return STATUS_INVALID_PARAMETER;
+
     if ((ret = pgnutls_privkey_export_rsa_raw( key_data(key)->a.privkey, &m, &e, &d, &p, &q, &u, &e1, &e2 )))
     {
         pgnutls_perror( ret );

dlls/bcrypt/tests/bcrypt.c

@@ -2212,7 +2212,7 @@ static void test_RSA_SIGN(void)
     BCRYPT_RSAKEY_BLOB *rsablob;
     NTSTATUS ret;
     ULONG size, size2;
-    BYTE *buf;
+    BYTE *buf, buf2[sizeof(BCRYPT_RSAKEY_BLOB) + sizeof(rsaPublicBlob)];
 
     ret = BCryptOpenAlgorithmProvider(&alg, BCRYPT_RSA_SIGN_ALGORITHM, NULL, 0);
     if (ret)
@@ -2224,6 +2224,22 @@ static void test_RSA_SIGN(void)
     ret = BCryptImportKeyPair(alg, NULL, BCRYPT_RSAPUBLIC_BLOB, &key, rsaPublicBlob, sizeof(rsaPublicBlob), 0);
     ok(!ret, "BCryptImportKeyPair failed: %#lx\n", ret);
 
+    memset(buf2, 0xcc, sizeof(buf2));
+    ret = BCryptExportKey(key, NULL, BCRYPT_RSAPUBLIC_BLOB, buf2, sizeof(buf2), &size, 0);
+    ok(!ret, "got %#lx\n", ret);
+    rsablob = (BCRYPT_RSAKEY_BLOB *)buf2;
+    ok(rsablob->Magic == BCRYPT_RSAPUBLIC_MAGIC, "got %#lx\n", rsablob->Magic);
+    ok(rsablob->BitLength == 2048, "got %lu\n", rsablob->BitLength);
+    ok(rsablob->cbPublicExp == 3, "got %lu\n", rsablob->cbPublicExp);
+    ok(rsablob->cbModulus == 256, "got %lu\n", rsablob->cbModulus);
+    ok(rsablob->cbPrime1 == 0, "got %lu\n", rsablob->cbPrime1);
+    ok(rsablob->cbPrime2 == 0, "got %lu\n", rsablob->cbPrime2);
+    size2 = sizeof(*rsablob) + rsablob->cbPublicExp + rsablob->cbModulus + rsablob->cbPrime1 + rsablob->cbPrime2;
+    ok(size == size2, "got %lu expected %lu\n", size2, size);
+
+    ret = BCryptExportKey(key, NULL, BCRYPT_RSAPRIVATE_BLOB, buf2, sizeof(buf2), &size, 0);
+    ok(ret == STATUS_INVALID_PARAMETER, "got %#lx\n", ret);
+
     pad.pszAlgId = BCRYPT_SHA1_ALGORITHM;
     ret = BCryptVerifySignature(key, &pad, rsaHash, sizeof(rsaHash), rsaSignature, sizeof(rsaSignature), BCRYPT_PAD_PKCS1);
     ok(!ret, "BCryptVerifySignature failed: %#lx\n", ret);