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/* $Id: x509-verify.cpp $ */
/** @file
* IPRT - Crypto - X.509, Signature verficiation.
*/
/*
* Copyright (C) 2006-2020 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE 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.
*/
/*********************************************************************************************************************************
* 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);
if (pParameters)
{
AssertPtrReturn(pParameters, VERR_INVALID_POINTER);
if (pParameters->enmType == RTASN1TYPE_NULL)
pParameters = NULL;
}
AssertPtrReturn(pPublicKey, VERR_INVALID_POINTER);
AssertReturn(RTAsn1BitString_IsPresent(pPublicKey), VERR_INVALID_POINTER);
/*
* Check if the algorithm matches.
*/
const char *pszCipherOid = RTCrPkixGetCiperOidFromSignatureAlgorithm(&pThis->SignatureAlgorithm.Algorithm);
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, 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.
*/
if ( pThis->TbsCertificate.SeqCore.Asn1Core.uData.pu8
&& pThis->TbsCertificate.SeqCore.Asn1Core.cb > 0)
rc = RTCrPkixPubKeyVerifySignature(&pThis->SignatureAlgorithm.Algorithm, hPubKey, pParameters, &pThis->SignatureValue,
RTASN1CORE_GET_RAW_ASN1_PTR(&pThis->TbsCertificate.SeqCore.Asn1Core),
RTASN1CORE_GET_RAW_ASN1_SIZE(&pThis->TbsCertificate.SeqCore.Asn1Core),
pErrInfo);
else
{
uint32_t cbEncoded;
rc = RTAsn1EncodePrepare((PRTASN1CORE)&pThis->TbsCertificate.SeqCore.Asn1Core, RTASN1ENCODE_F_DER, &cbEncoded, pErrInfo);
if (RT_SUCCESS(rc))
{
void *pvTbsBits = RTMemTmpAlloc(cbEncoded);
if (pvTbsBits)
{
rc = RTAsn1EncodeToBuffer(&pThis->TbsCertificate.SeqCore.Asn1Core, RTASN1ENCODE_F_DER,
pvTbsBits, cbEncoded, pErrInfo);
if (RT_SUCCESS(rc))
rc = RTCrPkixPubKeyVerifySignature(&pThis->SignatureAlgorithm.Algorithm, hPubKey, pParameters,
&pThis->SignatureValue, pvTbsBits, cbEncoded, pErrInfo);
else
AssertRC(rc);
RTMemTmpFree(pvTbsBits);
}
else
rc = VERR_NO_TMP_MEMORY;
}
}
/* 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);
/*
* Assemble parameters for the generic verification call.
*/
PCRTCRX509TBSCERTIFICATE const pTbsCert = &pThis->TbsCertificate;
PCRTASN1DYNTYPE pParameters = NULL;
if ( RTASN1CORE_IS_PRESENT(&pTbsCert->SubjectPublicKeyInfo.Algorithm.Parameters.u.Core)
&& pTbsCert->SubjectPublicKeyInfo.Algorithm.Parameters.enmType != RTASN1TYPE_NULL)
pParameters = &pTbsCert->SubjectPublicKeyInfo.Algorithm.Parameters;
return RTCrX509Certificate_VerifySignature(pThis, &pTbsCert->SubjectPublicKeyInfo.Algorithm.Algorithm, pParameters,
&pTbsCert->SubjectPublicKeyInfo.SubjectPublicKey, pErrInfo);
}
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