mirror of https://github.com/acidanthera/audk.git
481 lines
13 KiB
C
481 lines
13 KiB
C
/** @file
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PKCS#7 SignedData Verification Wrapper Implementation over OpenSSL.
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Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "InternalCryptLib.h"
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#include <openssl/objects.h>
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#include <openssl/x509.h>
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#include <openssl/pkcs7.h>
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UINT8 mOidValue[9] = { 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01, 0x07, 0x02 };
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/**
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Verification callback function to override any existing callbacks in OpenSSL
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for intermediate certificate supports.
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@param[in] Status Original status before calling this callback.
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@param[in] Context X509 store context.
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@retval 1 Current X509 certificate is verified successfully.
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@retval 0 Verification failed.
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**/
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int
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X509VerifyCb (
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IN int Status,
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IN X509_STORE_CTX *Context
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)
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{
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X509_OBJECT *Obj;
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INTN Error;
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INTN Index;
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INTN Count;
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Obj = NULL;
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Error = (INTN) X509_STORE_CTX_get_error (Context);
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//
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// X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT and X509_V_ERR_UNABLE_TO_GET_ISSUER_
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// CERT_LOCALLY mean a X509 certificate is not self signed and its issuer
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// can not be found in X509_verify_cert of X509_vfy.c.
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// In order to support intermediate certificate node, we override the
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// errors if the certification is obtained from X509 store, i.e. it is
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// a trusted ceritifcate node that is enrolled by user.
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// Besides,X509_V_ERR_CERT_UNTRUSTED and X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE
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// are also ignored to enable such feature.
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//
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if ((Error == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT) ||
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(Error == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY)) {
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Obj = (X509_OBJECT *) OPENSSL_malloc (sizeof (X509_OBJECT));
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if (Obj == NULL) {
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return 0;
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}
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Obj->type = X509_LU_X509;
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Obj->data.x509 = Context->current_cert;
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CRYPTO_w_lock (CRYPTO_LOCK_X509_STORE);
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if (X509_OBJECT_retrieve_match (Context->ctx->objs, Obj)) {
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Status = 1;
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} else {
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//
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// If any certificate in the chain is enrolled as trusted certificate,
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// pass the certificate verification.
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//
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if (Error == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY) {
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Count = (INTN) sk_X509_num (Context->chain);
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for (Index = 0; Index < Count; Index++) {
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Obj->data.x509 = sk_X509_value (Context->chain, (int) Index);
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if (X509_OBJECT_retrieve_match (Context->ctx->objs, Obj)) {
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Status = 1;
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break;
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}
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}
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}
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}
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CRYPTO_w_unlock (CRYPTO_LOCK_X509_STORE);
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}
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if ((Error == X509_V_ERR_CERT_UNTRUSTED) ||
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(Error == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE)) {
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Status = 1;
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}
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if (Obj != NULL) {
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OPENSSL_free (Obj);
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}
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return Status;
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}
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/**
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Creates a PKCS#7 signedData as described in "PKCS #7: Cryptographic Message
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Syntax Standard, version 1.5". This interface is only intended to be used for
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application to perform PKCS#7 functionality validation.
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@param[in] PrivateKey Pointer to the PEM-formatted private key data for
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data signing.
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@param[in] PrivateKeySize Size of the PEM private key data in bytes.
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@param[in] KeyPassword NULL-terminated passphrase used for encrypted PEM
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key data.
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@param[in] InData Pointer to the content to be signed.
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@param[in] InDataSize Size of InData in bytes.
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@param[in] SignCert Pointer to signer's DER-encoded certificate to sign with.
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@param[in] OtherCerts Pointer to an optional additional set of certificates to
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include in the PKCS#7 signedData (e.g. any intermediate
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CAs in the chain).
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@param[out] SignedData Pointer to output PKCS#7 signedData.
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@param[out] SignedDataSize Size of SignedData in bytes.
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@retval TRUE PKCS#7 data signing succeeded.
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@retval FALSE PKCS#7 data signing failed.
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**/
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BOOLEAN
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EFIAPI
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Pkcs7Sign (
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IN CONST UINT8 *PrivateKey,
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IN UINTN PrivateKeySize,
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IN CONST UINT8 *KeyPassword,
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IN UINT8 *InData,
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IN UINTN InDataSize,
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IN UINT8 *SignCert,
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IN UINT8 *OtherCerts OPTIONAL,
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OUT UINT8 **SignedData,
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OUT UINTN *SignedDataSize
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)
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{
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BOOLEAN Status;
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EVP_PKEY *Key;
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BIO *DataBio;
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PKCS7 *Pkcs7;
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UINT8 *RsaContext;
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UINT8 *P7Data;
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UINTN P7DataSize;
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UINT8 *Tmp;
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//
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// Check input parameters.
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//
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if ((PrivateKey == NULL) || (KeyPassword == NULL) || (InData == NULL)) {
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return FALSE;
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}
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if ((SignCert == NULL) || (SignedData == NULL) || (SignedDataSize == NULL)) {
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return FALSE;
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}
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if (InDataSize > INT_MAX) {
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return FALSE;
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}
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RsaContext = NULL;
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Key = NULL;
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Pkcs7 = NULL;
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DataBio = NULL;
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Status = FALSE;
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//
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// Retrieve RSA private key from PEM data.
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//
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Status = RsaGetPrivateKeyFromPem (
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PrivateKey,
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PrivateKeySize,
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(CONST CHAR8 *) KeyPassword,
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(VOID **) &RsaContext
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);
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if (!Status) {
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return Status;
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}
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//
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// Register & Initialize necessary digest algorithms and PRNG for PKCS#7 Handling
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//
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EVP_add_digest (EVP_md5());
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EVP_add_digest (EVP_sha1());
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EVP_add_digest (EVP_sha256());
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RandomSeed (NULL, 0);
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//
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// Construct OpenSSL EVP_PKEY for private key.
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//
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Key = EVP_PKEY_new ();
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if (Key == NULL) {
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goto _Exit;
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}
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Key->save_type = EVP_PKEY_RSA;
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Key->type = EVP_PKEY_type (EVP_PKEY_RSA);
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Key->pkey.rsa = (RSA *) RsaContext;
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//
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// Convert the data to be signed to BIO format.
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//
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DataBio = BIO_new (BIO_s_mem ());
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BIO_write (DataBio, InData, (int) InDataSize);
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//
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// Create the PKCS#7 signedData structure.
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//
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Pkcs7 = PKCS7_sign (
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(X509 *) SignCert,
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Key,
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(STACK_OF(X509) *) OtherCerts,
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DataBio,
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PKCS7_BINARY | PKCS7_NOATTR | PKCS7_DETACHED
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);
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if (Pkcs7 == NULL) {
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goto _Exit;
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}
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//
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// Convert PKCS#7 signedData structure into DER-encoded buffer.
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//
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P7DataSize = i2d_PKCS7 (Pkcs7, NULL);
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if (P7DataSize <= 19) {
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goto _Exit;
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}
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P7Data = OPENSSL_malloc (P7DataSize);
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Tmp = P7Data;
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P7DataSize = i2d_PKCS7 (Pkcs7, (unsigned char **) &Tmp);
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//
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// Strip ContentInfo to content only for signeddata. The data be trimmed off
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// is totally 19 bytes.
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//
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*SignedDataSize = P7DataSize - 19;
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*SignedData = OPENSSL_malloc (*SignedDataSize);
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CopyMem (*SignedData, P7Data + 19, *SignedDataSize);
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OPENSSL_free (P7Data);
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Status = TRUE;
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_Exit:
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//
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// Release Resources
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//
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if (RsaContext != NULL) {
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RsaFree (RsaContext);
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if (Key != NULL) {
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Key->pkey.rsa = NULL;
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}
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}
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if (Key != NULL) {
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EVP_PKEY_free (Key);
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}
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if (DataBio != NULL) {
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BIO_free (DataBio);
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}
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if (Pkcs7 != NULL) {
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PKCS7_free (Pkcs7);
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}
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return Status;
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}
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/**
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Verifies the validility of a PKCS#7 signed data as described in "PKCS #7:
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Cryptographic Message Syntax Standard". The input signed data could be wrapped
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in a ContentInfo structure.
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If P7Data is NULL, then ASSERT().
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@param[in] P7Data Pointer to the PKCS#7 message to verify.
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@param[in] P7Length Length of the PKCS#7 message in bytes.
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@param[in] TrustedCert Pointer to a trusted/root certificate encoded in DER, which
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is used for certificate chain verification.
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@param[in] CertLength Length of the trusted certificate in bytes.
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@param[in] InData Pointer to the content to be verified.
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@param[in] DataLength Length of InData in bytes.
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@retval TRUE The specified PKCS#7 signed data is valid.
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@retval FALSE Invalid PKCS#7 signed data.
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**/
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BOOLEAN
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EFIAPI
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Pkcs7Verify (
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IN CONST UINT8 *P7Data,
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IN UINTN P7Length,
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IN CONST UINT8 *TrustedCert,
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IN UINTN CertLength,
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IN CONST UINT8 *InData,
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IN UINTN DataLength
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)
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{
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PKCS7 *Pkcs7;
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BIO *CertBio;
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BIO *DataBio;
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BOOLEAN Status;
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X509 *Cert;
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X509_STORE *CertStore;
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UINT8 *SignedData;
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UINT8 *Temp;
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UINTN SignedDataSize;
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BOOLEAN Wrapped;
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//
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// ASSERT if P7Data is NULL or P7Length is not larger than 19 bytes.
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//
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ASSERT ((P7Data != NULL) || (P7Length <= 19));
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if ((CertLength > INT_MAX) || (DataLength > INT_MAX)) {
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return FALSE;
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}
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Status = FALSE;
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Pkcs7 = NULL;
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CertBio = NULL;
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DataBio = NULL;
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Cert = NULL;
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CertStore = NULL;
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//
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// Register & Initialize necessary digest algorithms for PKCS#7 Handling
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//
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EVP_add_digest (EVP_md5());
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EVP_add_digest (EVP_sha1());
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EVP_add_digest_alias (SN_sha1WithRSAEncryption, SN_sha1WithRSA);
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EVP_add_digest (EVP_sha256());
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//
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// Check whether input P7Data is a wrapped ContentInfo structure or not.
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//
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Wrapped = FALSE;
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if ((P7Data[4] == 0x06) && (P7Data[5] == 0x09)) {
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if (CompareMem (P7Data + 6, mOidValue, sizeof (mOidValue)) == 0) {
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if ((P7Data[15] == 0xA0) && (P7Data[16] == 0x82)) {
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Wrapped = TRUE;
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}
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}
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}
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if (Wrapped) {
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SignedData = (UINT8 *) P7Data;
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SignedDataSize = P7Length;
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} else {
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//
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// Wrap PKCS#7 signeddata to a ContentInfo structure - add a header in 19 bytes.
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//
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SignedDataSize = P7Length + 19;
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SignedData = OPENSSL_malloc (SignedDataSize);
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if (SignedData == NULL) {
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return FALSE;
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}
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//
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// Part1: 0x30, 0x82.
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//
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SignedData[0] = 0x30;
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SignedData[1] = 0x82;
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//
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// Part2: Length1 = P7Length + 19 - 4, in big endian.
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//
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SignedData[2] = (UINT8) (((UINT16) (SignedDataSize - 4)) >> 8);
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SignedData[3] = (UINT8) (((UINT16) (SignedDataSize - 4)) & 0xff);
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//
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// Part3: 0x06, 0x09.
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//
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SignedData[4] = 0x06;
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SignedData[5] = 0x09;
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//
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// Part4: OID value -- 0x2A 0x86 0x48 0x86 0xF7 0x0D 0x01 0x07 0x02.
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//
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CopyMem (SignedData + 6, mOidValue, sizeof (mOidValue));
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//
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// Part5: 0xA0, 0x82.
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//
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SignedData[15] = 0xA0;
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SignedData[16] = 0x82;
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//
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// Part6: Length2 = P7Length, in big endian.
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//
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SignedData[17] = (UINT8) (((UINT16) P7Length) >> 8);
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SignedData[18] = (UINT8) (((UINT16) P7Length) & 0xff);
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//
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// Part7: P7Data.
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//
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CopyMem (SignedData + 19, P7Data, P7Length);
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}
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//
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// Retrieve PKCS#7 Data (DER encoding)
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//
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if (SignedDataSize > INT_MAX) {
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goto _Exit;
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}
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Temp = SignedData;
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Pkcs7 = d2i_PKCS7 (NULL, (const unsigned char **) &Temp, (int) SignedDataSize);
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if (Pkcs7 == NULL) {
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goto _Exit;
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}
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//
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// Check if it's PKCS#7 Signed Data (for Authenticode Scenario)
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//
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if (!PKCS7_type_is_signed (Pkcs7)) {
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goto _Exit;
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}
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//
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// Read DER-encoded root certificate and Construct X509 Certificate
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//
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CertBio = BIO_new (BIO_s_mem ());
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BIO_write (CertBio, TrustedCert, (int)CertLength);
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if (CertBio == NULL) {
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goto _Exit;
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}
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Cert = d2i_X509_bio (CertBio, NULL);
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if (Cert == NULL) {
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goto _Exit;
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}
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//
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// Setup X509 Store for trusted certificate
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//
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CertStore = X509_STORE_new ();
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if (CertStore == NULL) {
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goto _Exit;
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}
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if (!(X509_STORE_add_cert (CertStore, Cert))) {
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goto _Exit;
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}
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//
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// Register customized X509 verification callback function to support
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// trusted intermediate certificate anchor.
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//
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CertStore->verify_cb = X509VerifyCb;
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//
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// For generic PKCS#7 handling, InData may be NULL if the content is present
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// in PKCS#7 structure. So ignore NULL checking here.
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//
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DataBio = BIO_new (BIO_s_mem ());
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BIO_write (DataBio, InData, (int)DataLength);
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//
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// Verifies the PKCS#7 signedData structure
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//
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Status = (BOOLEAN) PKCS7_verify (Pkcs7, NULL, CertStore, DataBio, NULL, PKCS7_BINARY);
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_Exit:
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//
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// Release Resources
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//
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BIO_free (DataBio);
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BIO_free (CertBio);
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X509_free (Cert);
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X509_STORE_free (CertStore);
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PKCS7_free (Pkcs7);
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if (!Wrapped) {
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OPENSSL_free (SignedData);
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}
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return Status;
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}
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