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/** @file
PKCS#7 SignedData Sign Wrapper Implementation over OpenSSL.
Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "InternalCryptLib.h"
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/pkcs7.h>
/**
Creates a PKCS#7 signedData as described in "PKCS #7: Cryptographic Message
Syntax Standard, version 1.5". This interface is only intended to be used for
application to perform PKCS#7 functionality validation.
@param[in] PrivateKey Pointer to the PEM-formatted private key data for
data signing.
@param[in] PrivateKeySize Size of the PEM private key data in bytes.
@param[in] KeyPassword NULL-terminated passphrase used for encrypted PEM
key data.
@param[in] InData Pointer to the content to be signed.
@param[in] InDataSize Size of InData in bytes.
@param[in] SignCert Pointer to signer's DER-encoded certificate to sign with.
@param[in] OtherCerts Pointer to an optional additional set of certificates to
include in the PKCS#7 signedData (e.g. any intermediate
CAs in the chain).
@param[out] SignedData Pointer to output PKCS#7 signedData. It's caller's
responsibility to free the buffer with FreePool().
@param[out] SignedDataSize Size of SignedData in bytes.
@retval TRUE PKCS#7 data signing succeeded.
@retval FALSE PKCS#7 data signing failed.
**/
BOOLEAN
EFIAPI
Pkcs7Sign (
IN CONST UINT8 *PrivateKey,
IN UINTN PrivateKeySize,
IN CONST UINT8 *KeyPassword,
IN UINT8 *InData,
IN UINTN InDataSize,
IN UINT8 *SignCert,
IN UINT8 *OtherCerts OPTIONAL,
OUT UINT8 **SignedData,
OUT UINTN *SignedDataSize
)
{
BOOLEAN Status;
EVP_PKEY *Key;
BIO *DataBio;
PKCS7 *Pkcs7;
UINT8 *RsaContext;
UINT8 *P7Data;
UINTN P7DataSize;
UINT8 *Tmp;
//
// Check input parameters.
//
if ((PrivateKey == NULL) || (KeyPassword == NULL) || (InData == NULL) ||
(SignCert == NULL) || (SignedData == NULL) || (SignedDataSize == NULL) || (InDataSize > INT_MAX))
{
return FALSE;
}
RsaContext = NULL;
Key = NULL;
Pkcs7 = NULL;
DataBio = NULL;
Status = FALSE;
//
// Retrieve RSA private key from PEM data.
//
Status = RsaGetPrivateKeyFromPem (
PrivateKey,
PrivateKeySize,
(CONST CHAR8 *)KeyPassword,
(VOID **)&RsaContext
);
if (!Status) {
return Status;
}
Status = FALSE;
//
// Register & Initialize necessary digest algorithms and PRNG for PKCS#7 Handling
//
if (EVP_add_digest (EVP_md5 ()) == 0) {
goto _Exit;
}
if (EVP_add_digest (EVP_sha1 ()) == 0) {
goto _Exit;
}
if (EVP_add_digest (EVP_sha256 ()) == 0) {
goto _Exit;
}
RandomSeed (NULL, 0);
//
// Construct OpenSSL EVP_PKEY for private key.
//
Key = EVP_PKEY_new ();
if (Key == NULL) {
goto _Exit;
}
if (EVP_PKEY_assign_RSA (Key, (RSA *)RsaContext) == 0) {
goto _Exit;
}
//
// Convert the data to be signed to BIO format.
//
DataBio = BIO_new (BIO_s_mem ());
if (DataBio == NULL) {
goto _Exit;
}
if (BIO_write (DataBio, InData, (int)InDataSize) <= 0) {
goto _Exit;
}
//
// Create the PKCS#7 signedData structure.
//
Pkcs7 = PKCS7_sign (
(X509 *)SignCert,
Key,
(STACK_OF (X509) *) OtherCerts,
DataBio,
PKCS7_BINARY | PKCS7_NOATTR | PKCS7_DETACHED
);
if (Pkcs7 == NULL) {
goto _Exit;
}
//
// Convert PKCS#7 signedData structure into DER-encoded buffer.
//
P7DataSize = i2d_PKCS7 (Pkcs7, NULL);
if (P7DataSize <= 19) {
goto _Exit;
}
P7Data = malloc (P7DataSize);
if (P7Data == NULL) {
goto _Exit;
}
Tmp = P7Data;
P7DataSize = i2d_PKCS7 (Pkcs7, (unsigned char **)&Tmp);
ASSERT (P7DataSize > 19);
//
// Strip ContentInfo to content only for signeddata. The data be trimmed off
// is totally 19 bytes.
//
*SignedDataSize = P7DataSize - 19;
*SignedData = AllocatePool (*SignedDataSize);
if (*SignedData == NULL) {
OPENSSL_free (P7Data);
goto _Exit;
}
CopyMem (*SignedData, P7Data + 19, *SignedDataSize);
OPENSSL_free (P7Data);
Status = TRUE;
_Exit:
//
// Release Resources
//
if (Key != NULL) {
EVP_PKEY_free (Key);
}
if (DataBio != NULL) {
BIO_free (DataBio);
}
if (Pkcs7 != NULL) {
PKCS7_free (Pkcs7);
}
return Status;
}
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