Access Violation при вызове CryptSignAndEncryptMessage

Подскажите, что я делаю неправильно?
Вот полностью код после получения pCertContext:
const
CERT_ENCODING_TYPE = X509_ASN_ENCODING or PKCS_7_ASN_ENCODING;
var
pCertContext: PCCERT_CONTEXT;
SignPara: CRYPT_SIGN_MESSAGE_PARA;
EncryptPara: CRYPT_ENCRYPT_MESSAGE_PARA;
pbSignedAndEncryptedBlob: PBYTE;
dwKeySpec: DWORD;
hCryptProv: HCRYPTPROV;
bToBeSignedAndEncrypted: array[0..1] of BYTE;
cbToBeSignedAndEncrypted: DWORD;
cbSignedAndEncryptedBlob: DWORD;
begin
CryptAcquireCertificatePrivateKey(
pCertContext,
0,
nil,
@hCryptProv,
@dwKeySpec,
nil);

FillChar(SignPara, SizeOf(CRYPT_SIGN_MESSAGE_PARA), 0);
SignPara.cbSize := SizeOf(CRYPT_SIGN_MESSAGE_PARA);
SignPara.dwMsgEncodingType := CERT_ENCODING_TYPE;
SignPara.pSigningCert := pCertContext;
SignPara.HashAlgorithm.pszObjId := szOID_RSA_MD2;
SignPara.cMsgCert := 1;
SignPara.rgpMsgCert := @pCertContext;

FillChar(EncryptPara, SizeOf(CRYPT_SIGN_MESSAGE_PARA), 0);
EncryptPara.cbSize := SizeOf(CRYPT_ENCRYPT_MESSAGE_PARA);
EncryptPara.dwMsgEncodingType := CERT_ENCODING_TYPE;
EncryptPara.ContentEncryptionAlgorithm.pszObjId := szOID_RSA_RC4;
EncryptPara.ContentEncryptionAlgorithm.Parameters.cbData := 0;
EncryptPara.pvEncryptionAuxInfo := nil;
EncryptPara.dwFlags := 0;
EncryptPara.dwInnerContentType := 0;

cbToBeSignedAndEncrypted := 1;
bToBeSignedAndEncrypted[0] := 33;
bToBeSignedAndEncrypted[1] := 44;
cbSignedAndEncryptedBlob := 0;
pbSignedAndEncryptedBlob := nil;

CryptSignAndEncryptMessage(
@SignPara,
@EncryptPara,
1,
pCertContext,
@bToBeSignedAndEncrypted,
cbToBeSignedAndEncrypted,
nil,
@cbSignedAndEncryptedBlob);
...

На этом вызове и вылетает.