1 files changed, 131 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/crypto/x509-verify.cpp b/src/VBox/Runtime/common/crypto/x509-verify.cpp
new file mode 100644
index 00000000..e2b42c08
--- /dev/null
+++ b/src/VBox/Runtime/common/crypto/x509-verify.cpp
@@ -0,0 +1,131 @@
+/* $Id: x509-verify.cpp $ */
+/** @file
+ * IPRT - Crypto - X.509, Signature verification.
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "internal/iprt.h"
+#include <iprt/crypto/x509.h>
+#include <iprt/crypto/pkix.h>
+#include <iprt/crypto/key.h>
+
+#include <iprt/err.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+
+
+RTDECL(int) RTCrX509Certificate_VerifySignature(PCRTCRX509CERTIFICATE pThis, PCRTASN1OBJID pAlgorithm,
+                                                PCRTASN1DYNTYPE pParameters, PCRTASN1BITSTRING pPublicKey,
+                                                PRTERRINFO pErrInfo)
+{
+    /*
+     * Validate the input a little.
+     */
+    AssertPtrReturn(pThis, VERR_INVALID_POINTER);
+    AssertReturn(RTCrX509Certificate_IsPresent(pThis), VERR_INVALID_PARAMETER);
+
+    AssertPtrReturn(pAlgorithm, VERR_INVALID_POINTER);
+    AssertReturn(RTAsn1ObjId_IsPresent(pAlgorithm), VERR_INVALID_POINTER);
+
+    AssertPtrReturn(pPublicKey, VERR_INVALID_POINTER);
+    AssertReturn(RTAsn1BitString_IsPresent(pPublicKey), VERR_INVALID_POINTER);
+
+    /*
+     * Check if the algorithm matches.
+     */
+    const char * const pszCipherOid = RTCrX509AlgorithmIdentifier_GetEncryptionOid(&pThis->SignatureAlgorithm,
+                                                                                   true /*fMustIncludeHash*/);
+    if (!pszCipherOid)
+        return RTErrInfoSetF(pErrInfo, VERR_CR_X509_UNKNOWN_CERT_SIGN_ALGO,
+                             "Certificate signature algorithm not known: %s",
+                             pThis->SignatureAlgorithm.Algorithm.szObjId);
+
+    if (RTAsn1ObjId_CompareWithString(pAlgorithm, pszCipherOid) != 0)
+        return RTErrInfoSetF(pErrInfo, VERR_CR_X509_CERT_SIGN_ALGO_MISMATCH,
+                             "Certificate signature cipher algorithm mismatch: cert uses %s (%s) while key uses %s",
+                             pszCipherOid, pThis->SignatureAlgorithm.Algorithm.szObjId, pAlgorithm->szObjId);
+
+    /*
+     * Wrap up the public key.
+     */
+    RTCRKEY hPubKey;
+    int rc = RTCrKeyCreateFromPublicAlgorithmAndBits(&hPubKey, pAlgorithm, pParameters, pPublicKey, pErrInfo, NULL);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    /*
+     * Here we should recode the to-be-signed part as DER, but we'll ASSUME
+     * that it's already in DER encoding and only does this if there the
+     * encoded bits are missing.
+     */
+    const uint8_t  *pbRaw;
+    uint32_t        cbRaw;
+    void           *pvFree = NULL;
+    rc = RTAsn1EncodeQueryRawBits(RTCrX509TbsCertificate_GetAsn1Core(&pThis->TbsCertificate), &pbRaw, &cbRaw, &pvFree, pErrInfo);
+    if (RT_SUCCESS(rc))
+    {
+        rc = RTCrPkixPubKeyVerifySignature(&pThis->SignatureAlgorithm.Algorithm, hPubKey, &pThis->SignatureAlgorithm.Parameters,
+                                           &pThis->SignatureValue, pbRaw, cbRaw, pErrInfo);
+        RTMemTmpFree(pvFree);
+    }
+
+    /* Free the public key. */
+    uint32_t cRefs = RTCrKeyRelease(hPubKey);
+    Assert(cRefs == 0); NOREF(cRefs);
+
+    return rc;
+}
+
+
+RTDECL(int) RTCrX509Certificate_VerifySignatureSelfSigned(PCRTCRX509CERTIFICATE pThis, PRTERRINFO pErrInfo)
+{
+    /*
+     * Validate the input a little.
+     */
+    AssertPtrReturn(pThis, VERR_INVALID_POINTER);
+    AssertReturn(RTCrX509Certificate_IsPresent(pThis), VERR_INVALID_PARAMETER);
+
+    /*
+     * Call generic verification function.
+     */
+    PCRTCRX509TBSCERTIFICATE const pTbsCert = &pThis->TbsCertificate;
+    return RTCrX509Certificate_VerifySignature(pThis,
+                                               &pTbsCert->SubjectPublicKeyInfo.Algorithm.Algorithm,
+                                               &pTbsCert->SubjectPublicKeyInfo.Algorithm.Parameters,
+                                               &pTbsCert->SubjectPublicKeyInfo.SubjectPublicKey, pErrInfo);
+}
+