1 files changed, 108 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/crypto/pkix-util.cpp b/src/VBox/Runtime/common/crypto/pkix-util.cpp
new file mode 100644
index 00000000..1198d0e0
--- /dev/null
+++ b/src/VBox/Runtime/common/crypto/pkix-util.cpp
@@ -0,0 +1,108 @@
+/* $Id: pkix-util.cpp $ */
+/** @file
+ * IPRT - Crypto - Public Key Infrastructure API, Utilities.
+ */
+
+/*
+ * 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/pkix.h>
+
+#include <iprt/asn1.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/crypto/rsa.h>
+
+
+RTDECL(const char *) RTCrPkixGetCiperOidFromSignatureAlgorithmOid(const char *pszSignatureOid)
+{
+    return RTCrX509AlgorithmIdentifier_GetEncryptionOidFromOid(pszSignatureOid, true /*fMustIncludeHash*/);
+}
+
+
+RTDECL(const char *) RTCrPkixGetCiperOidFromSignatureAlgorithm(PCRTASN1OBJID pAlgorithm)
+{
+    return RTCrX509AlgorithmIdentifier_GetEncryptionOidFromOid(pAlgorithm->szObjId, true /*fMustIncludeHash*/);
+}
+
+
+RTDECL(bool) RTCrPkixPubKeyCanHandleDigestType(PCRTCRX509SUBJECTPUBLICKEYINFO pPublicKeyInfo, RTDIGESTTYPE enmDigestType,
+                                               PRTERRINFO pErrInfo)
+{
+    bool fRc = false;
+    if (RTCrX509SubjectPublicKeyInfo_IsPresent(pPublicKeyInfo))
+    {
+        void const * const  pvKeyBits = RTASN1BITSTRING_GET_BIT0_PTR(&pPublicKeyInfo->SubjectPublicKey);
+        uint32_t const      cbKeyBits = RTASN1BITSTRING_GET_BYTE_SIZE(&pPublicKeyInfo->SubjectPublicKey);
+        RTASN1CURSORPRIMARY PrimaryCursor;
+        union
+        {
+            RTCRRSAPUBLICKEY    RsaPublicKey;
+        } u;
+
+        if (RTAsn1ObjId_CompareWithString(&pPublicKeyInfo->Algorithm.Algorithm, RTCR_PKCS1_RSA_OID) == 0)
+        {
+            /*
+             * RSA.
+             */
+            RTAsn1CursorInitPrimary(&PrimaryCursor, pvKeyBits, cbKeyBits, pErrInfo, &g_RTAsn1DefaultAllocator,
+                                    RTASN1CURSOR_FLAGS_DER, "rsa");
+
+            RT_ZERO(u.RsaPublicKey);
+            int rc = RTCrRsaPublicKey_DecodeAsn1(&PrimaryCursor.Cursor, 0, &u.RsaPublicKey, "PublicKey");
+            if (RT_SUCCESS(rc))
+                fRc = RTCrRsaPublicKey_CanHandleDigestType(&u.RsaPublicKey, enmDigestType, pErrInfo);
+            RTCrRsaPublicKey_Delete(&u.RsaPublicKey);
+        }
+        else
+        {
+            /** @todo ECDSA when adding signing support.  */
+            RTErrInfoSetF(pErrInfo, VERR_CR_PKIX_CIPHER_ALGO_NOT_KNOWN, "%s", pPublicKeyInfo->Algorithm.Algorithm.szObjId);
+            AssertMsgFailed(("unknown key algorithm: %s\n", pPublicKeyInfo->Algorithm.Algorithm.szObjId));
+            fRc = true;
+        }
+    }
+    return fRc;
+}
+
+
+RTDECL(bool) RTCrPkixCanCertHandleDigestType(PCRTCRX509CERTIFICATE pCertificate, RTDIGESTTYPE enmDigestType, PRTERRINFO pErrInfo)
+{
+    if (RTCrX509Certificate_IsPresent(pCertificate))
+        return RTCrPkixPubKeyCanHandleDigestType(&pCertificate->TbsCertificate.SubjectPublicKeyInfo, enmDigestType, pErrInfo);
+    return false;
+}
+