自学教程：C++ ASN1_item_d2i_bio函数代码示例

/** * Reads and parses the ASN.1 BootSignature block from the given offset * @param fd File descriptor to the boot image * @param offset Offset from the beginning of file to the signature * @param bs Pointer to receive the BootImage structure */static int read_signature(int fd, off64_t offset, BootSignature **bs){    BIO *in = NULL;    if (!bs) {        return -1;    }    if (lseek64(fd, offset, SEEK_SET) == -1) {        return -1;    }    if ((in = BIO_new_fd(fd, BIO_NOCLOSE)) == NULL) {        ERR_print_errors(g_error);        return -1;    }    if ((*bs = ASN1_item_d2i_bio(ASN1_ITEM_rptr(BootSignature), in, bs)) == NULL) {        ERR_print_errors(g_error);        BIO_free(in);        return -1;    }    BIO_free(in);    return 0;}

void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x){    BIO *b;    char *ret;    if ((b = BIO_new(BIO_s_file())) == NULL) {        ASN1err(ASN1_F_ASN1_ITEM_D2I_FP, ERR_R_BUF_LIB);        return (NULL);    }    BIO_set_fp(b, in, BIO_NOCLOSE);    ret = ASN1_item_d2i_bio(it, b, x);    BIO_free(b);    return (ret);}

void *ASN1_item_d2i_fp(const ASN1_ITEM *it, FILE *in, void *x)        {        BIO *b;        char *ret;        if ((b=BIO_new(BIO_s_file())) == NULL)		{		OPENSSL_PUT_ERROR(ASN1, ASN1_item_d2i_fp, ERR_R_BUF_LIB);                return(NULL);		}        BIO_set_fp(b,in,BIO_NOCLOSE);        ret=ASN1_item_d2i_bio(it,b,x);        BIO_free(b);        return(ret);        }

PKCS12 *d2i_PKCS12_bio(BIO *bp, PKCS12 **p12){    return ASN1_item_d2i_bio(ASN1_ITEM_rptr(PKCS12), bp, p12);}

DVT_STATUS CERTIFICATE_FILE_CLASS::importDer(const char* filename, bool certificatesOnly, const char*)//  DESCRIPTION     : Import certificates from a PEM formated file.//  PRECONDITIONS   ://  POSTCONDITIONS  ://  EXCEPTIONS      : //  NOTES           : Returns MSG_OK, MSG_ERROR, MSG_FILE_NOT_EXIST, MSG_NO_VALUE//					: DER does not support encryption, so MSG_INVALID_PASSWORD will never be returned//<<==========================================================================={	DVT_STATUS status = MSG_ERROR;	DVT_STATUS* status_ptr;	BIO* bio_ptr;	// clear the error queue	ERR_clear_error();	// open the file	bio_ptr = BIO_new(BIO_s_file_internal());	if (bio_ptr == NULL)	{		openSslM_ptr->printError(loggerM_ptr, LOG_ERROR, "setting up to read DER file");		status = MSG_ERROR;		goto end;	}	if (BIO_read_filename(bio_ptr, filename) <= 0)	{		unsigned long err;		err = ERR_peek_error();		if ((ERR_GET_LIB(err) == ERR_LIB_SYS) && (ERR_GET_REASON(err) == ERROR_FILE_NOT_FOUND))		{			// file does not exist			ERR_clear_error(); // eat any errors			status = MSG_FILE_NOT_EXIST;		}		else		{			openSslM_ptr->printError(loggerM_ptr, LOG_ERROR, "opening DER file for reading");			status = MSG_ERROR;		}		goto end;	}	// read the file and convert the data	if (certificatesOnly)	{		X509* cert_ptr;		cert_ptr = (X509*)ASN1_item_d2i_bio(ASN1_ITEM_rptr(X509), bio_ptr, NULL);		if (cert_ptr == NULL)		{			unsigned long err;			err = ERR_peek_error();			if ((ERR_GET_LIB(err) == ERR_LIB_ASN1) && (ERR_GET_REASON(err) == ASN1_R_WRONG_TAG))			{				// probably not a certificate				ERR_clear_error(); // eat any errors				status = MSG_NO_VALUE;			}			else			{				openSslM_ptr->printError(loggerM_ptr, LOG_ERROR, "decoding certificate in DER file");				status = MSG_ERROR;			}		}		else		{			// save the certificate			if (!push(cert_ptr))			{				status = MSG_ERROR;			}			else			{				status = MSG_OK;			}		}	}	else	{		// this calls derDecode()		status_ptr = (DVT_STATUS*)ASN1_d2i_bio(NULL, (char* (*)(void))derCallback, bio_ptr, (unsigned char**)this);		status = *status_ptr;		delete status_ptr;	}end:	if (bio_ptr != NULL) BIO_free(bio_ptr);	return status;}

RSA *d2i_RSAPublicKey_bio(BIO *bp, RSA **rsa){    return ASN1_item_d2i_bio(ASN1_ITEM_rptr(RSAPublicKey), bp, rsa);}

RSA *d2i_RSAPrivateKey_bio(BIO *bp, RSA **rsa)	{	return (RSA*)ASN1_item_d2i_bio(ASN1_ITEM_rptr(RSAPrivateKey), bp, rsa);	}

CPK_PUBLIC_PARAMS *d2i_CPK_PUBLIC_PARAMS_bio(BIO *bp, CPK_PUBLIC_PARAMS **params) {	return ASN1_item_d2i_bio(ASN1_ITEM_rptr(CPK_PUBLIC_PARAMS), bp, params);}

OCSP_RESPONSE *d2i_OCSP_RESPONSE_bio(BIO *bp, OCSP_RESPONSE **a){	return ASN1_item_d2i_bio(&OCSP_RESPONSE_it, bp, a);}

OCSP_REQUEST *d2i_OCSP_REQUEST_bio(BIO *bp, OCSP_REQUEST **a){	return ASN1_item_d2i_bio(&OCSP_REQUEST_it, bp, a);}

DSA *d2i_DSAparams_bio(BIO *bp, DSA **a){	return ASN1_item_d2i_bio(&DSAparams_it, bp, a);}

CMS_ContentInfo *d2i_CMS_bio(BIO *bp, CMS_ContentInfo **cms){    return ASN1_item_d2i_bio(ASN1_ITEM_rptr(CMS_ContentInfo), bp, cms);}

static int execute_test(D2I_TEST_FIXTURE fixture){    BIO *bio = NULL;    ASN1_VALUE *value = NULL;    int ret = 0;    unsigned char buf[2048];    const unsigned char *buf_ptr = buf;    unsigned char *der = NULL;    int derlen;    int len;    if ((bio = BIO_new_file(test_file, "r")) == NULL)        return 0;    if (expected_error == ASN1_BIO) {        value = ASN1_item_d2i_bio(item_type, bio, NULL);        if (value == NULL)            ret = 1;        goto err;    }    /*     * Unless we are testing it we don't use ASN1_item_d2i_bio because it     * performs sanity checks on the input and can reject it before the     * decoder is called.     */    len = BIO_read(bio, buf, sizeof(buf));    if (len < 0)        goto err;    value = ASN1_item_d2i(NULL, &buf_ptr, len, item_type);    if (value == NULL) {        if (expected_error == ASN1_DECODE)            ret = 1;        goto err;    }    derlen = ASN1_item_i2d(value, &der, item_type);    if (der == NULL || derlen < 0) {        if (expected_error == ASN1_ENCODE)            ret = 1;        goto err;    }    if (derlen != len || memcmp(der, buf, derlen) != 0) {        if (expected_error == ASN1_COMPARE)            ret = 1;        goto err;    }    if (expected_error == ASN1_OK)        ret = 1; err:    /* Don't indicate success for memory allocation errors */    if (ret == 1 && ERR_GET_REASON(ERR_peek_error()) == ERR_R_MALLOC_FAILURE)        ret = 0;    BIO_free(bio);    OPENSSL_free(der);    ASN1_item_free(value, item_type);    return ret;}