apps.c

openssl加密例子

	int res = 0;
	const char *prompt_info = NULL;
	const char *password = NULL;
	PW_CB_DATA *cb_data = (PW_CB_DATA *)cb_tmp;

	if (cb_data)
	{
		if (cb_data->password)
			password = cb_data->password;
		if (cb_data->prompt_info)
			prompt_info = cb_data->prompt_info;
	}

	if (password)
	{
		res = strlen(password);
		if (res > bufsiz)
			res = bufsiz;
		memcpy(buf, password, res);
		return res;
	}

	ui = UI_new_method(ui_method);
	if (ui)
	{
		int ok = 0;
		char *buff = NULL;
		int ui_flags = 0;
		char *prompt = NULL;

		prompt = UI_construct_prompt(ui, "pass phrase",
			prompt_info);

		ui_flags |= UI_INPUT_FLAG_DEFAULT_PWD;
		UI_ctrl(ui, UI_CTRL_PRINT_ERRORS, 1, 0, 0);

		if (ok >= 0)
			ok = UI_add_input_string(ui,prompt,ui_flags,buf,
				PW_MIN_LENGTH,BUFSIZ-1);
		if (ok >= 0 && verify)
			{
			buff = (char *)OPENSSL_malloc(bufsiz);
			ok = UI_add_verify_string(ui,prompt,ui_flags,buff,
				PW_MIN_LENGTH,BUFSIZ-1, buf);
			}
		if (ok >= 0)
			do
				{
				ok = UI_process(ui);
				}
			while (ok < 0 && UI_ctrl(ui, UI_CTRL_IS_REDOABLE, 0, 0, 0));

		if (buff)
			{
			OPENSSL_cleanse(buff,(unsigned int)bufsiz);
			OPENSSL_free(buff);
			}

		if (ok >= 0)
			res = strlen(buf);
		if (ok == -1)
			{
			BIO_printf(bio_err, "User interface error\n");
			ERR_print_errors(bio_err);
			OPENSSL_cleanse(buf,(unsigned int)bufsiz);
			res = 0;
			}
		if (ok == -2)
			{
			BIO_printf(bio_err,"aborted!\n");
			OPENSSL_cleanse(buf,(unsigned int)bufsiz);
			res = 0;
			}
		UI_free(ui);
		OPENSSL_free(prompt);
	}
	return res;
}

static char *app_get_pass(BIO *err, char *arg, int keepbio);

int app_passwd(BIO *err, char *arg1, char *arg2, char **pass1, char **pass2)
{
	int same;
	if(!arg2 || !arg1 || strcmp(arg1, arg2)) same = 0;
	else same = 1;
	if(arg1) {
		*pass1 = app_get_pass(err, arg1, same);
		if(!*pass1) return 0;
	} else if(pass1) *pass1 = NULL;
	if(arg2) {
		*pass2 = app_get_pass(err, arg2, same ? 2 : 0);
		if(!*pass2) return 0;
	} else if(pass2) *pass2 = NULL;
	return 1;
}

static char *app_get_pass(BIO *err, char *arg, int keepbio)
{
	char *tmp, tpass[APP_PASS_LEN];
	static BIO *pwdbio = NULL;
	int i;
	if(!strncmp(arg, "pass:", 5)) return BUF_strdup(arg + 5);
	if(!strncmp(arg, "env:", 4)) {
		tmp = getenv(arg + 4);
		if(!tmp) {
			BIO_printf(err, "Can't read environment variable %s\n", arg + 4);
			return NULL;
		}
		return BUF_strdup(tmp);
	}
	if(!keepbio || !pwdbio) {
		if(!strncmp(arg, "file:", 5)) {
			pwdbio = BIO_new_file(arg + 5, "r");
			if(!pwdbio) {
				BIO_printf(err, "Can't open file %s\n", arg + 5);
				return NULL;
			}
		} else if(!strncmp(arg, "fd:", 3)) {
			BIO *btmp;
			i = atoi(arg + 3);
			if(i >= 0) pwdbio = BIO_new_fd(i, BIO_NOCLOSE);
			if((i < 0) || !pwdbio) {
				BIO_printf(err, "Can't access file descriptor %s\n", arg + 3);
				return NULL;
			}
			/* Can't do BIO_gets on an fd BIO so add a buffering BIO */
			btmp = BIO_new(BIO_f_buffer());
			pwdbio = BIO_push(btmp, pwdbio);
		} else if(!strcmp(arg, "stdin")) {
			pwdbio = BIO_new_fp(stdin, BIO_NOCLOSE);
			if(!pwdbio) {
				BIO_printf(err, "Can't open BIO for stdin\n");
				return NULL;
			}
		} else {
			BIO_printf(err, "Invalid password argument \"%s\"\n", arg);
			return NULL;
		}
	}
	i = BIO_gets(pwdbio, tpass, APP_PASS_LEN);
	if(keepbio != 1) {
		BIO_free_all(pwdbio);
		pwdbio = NULL;
	}
	if(i <= 0) {
		BIO_printf(err, "Error reading password from BIO\n");
		return NULL;
	}
	tmp = strchr(tpass, '\n');
	if(tmp) *tmp = 0;
	return BUF_strdup(tpass);
}

int add_oid_section(BIO *err, CONF *conf)
{	
	char *p;
	STACK_OF(CONF_VALUE) *sktmp;
	CONF_VALUE *cnf;
	int i;
	if(!(p=NCONF_get_string(conf,NULL,"oid_section")))
		{
		ERR_clear_error();
		return 1;
		}
	if(!(sktmp = NCONF_get_section(conf, p))) {
		BIO_printf(err, "problem loading oid section %s\n", p);
		return 0;
	}
	for(i = 0; i < sk_CONF_VALUE_num(sktmp); i++) {
		cnf = sk_CONF_VALUE_value(sktmp, i);
		if(OBJ_create(cnf->value, cnf->name, cnf->name) == NID_undef) {
			BIO_printf(err, "problem creating object %s=%s\n",
							 cnf->name, cnf->value);
			return 0;
		}
	}
	return 1;
}

static int load_pkcs12(BIO *err, BIO *in, const char *desc,
		pem_password_cb *pem_cb,  void *cb_data,
		EVP_PKEY **pkey, X509 **cert, STACK_OF(X509) **ca)
{
 	const char *pass;
	char tpass[PEM_BUFSIZE];
	int len, ret = 0;
	PKCS12 *p12;
	p12 = d2i_PKCS12_bio(in, NULL);
	if (p12 == NULL)
	{
		BIO_printf(err, "Error loading PKCS12 file for %s\n", desc);	
		goto die;
	}
	/* See if an empty password will do */
	if (PKCS12_verify_mac(p12, "", 0) || PKCS12_verify_mac(p12, NULL, 0))
		pass = "";
	else
	{
		if (!pem_cb)
			pem_cb = (pem_password_cb *)password_callback;
		len = pem_cb(tpass, PEM_BUFSIZE, 0, cb_data);
		if (len < 0) 
		{
			BIO_printf(err, "Passpharse callback error for %s\n",
					desc);
			goto die;
		}
		if (len < PEM_BUFSIZE)
			tpass[len] = 0;
		if (!PKCS12_verify_mac(p12, tpass, len))
		{
			BIO_printf(err,
	"Mac verify error (wrong password?) in PKCS12 file for %s\n", desc);	
			goto die;
		}
		pass = tpass;
	}
	ret = PKCS12_parse(p12, pass, pkey, cert, ca);
	die:
	if (p12)
		PKCS12_free(p12);
	return ret;
}

X509 *load_cert(BIO *err, const char *file, int format,
	const char *pass, ENGINE *e, const char *cert_descrip)
{
	ASN1_HEADER *ah=NULL;
	BUF_MEM *buf=NULL;
	X509 *x=NULL;
	BIO *cert;

	if ((cert=BIO_new(BIO_s_file())) == NULL)
	{
		ERR_print_errors(err);
		goto end;
	}

	if (file == NULL)
	{
		setvbuf(stdin, NULL, _IONBF, 0);
		BIO_set_fp(cert,stdin,BIO_NOCLOSE);
	}
	else
	{
		if (BIO_read_filename(cert,file) <= 0)
			{
			BIO_printf(err, "Error opening %s %s\n",
				cert_descrip, file);
			ERR_print_errors(err);
			goto end;
			}
	}

	if 	(format == FORMAT_ASN1)
		x=d2i_X509_bio(cert,NULL);
	else if (format == FORMAT_NETSCAPE)
	{
		unsigned char *p,*op;
		int size=0,i;

		/* We sort of have to do it this way because it is sort of nice
		 * to read the header first and check it, then
		 * try to read the certificate */
		buf=BUF_MEM_new();
		for (;;)
		{
			if ((buf == NULL) || (!BUF_MEM_grow(buf,size+1024*10)))
				goto end;
			i=BIO_read(cert,&(buf->data[size]),1024*10);
			size+=i;
			if (i == 0) break;
			if (i < 0)
				{
				perror("reading certificate");
				goto end;
				}
		}
		p=(unsigned char *)buf->data;
		op=p;

		/* First load the header */
		if ((ah=d2i_ASN1_HEADER(NULL,&p,(long)size)) == NULL)
			goto end;
		if ((ah->header == NULL) || (ah->header->data == NULL) ||
			(strncmp(NETSCAPE_CERT_HDR,(char *)ah->header->data,
			ah->header->length) != 0))
		{
			BIO_printf(err,"Error reading header on certificate\n");
			goto end;
		}
		/* header is ok, so now read the object */
		p=op;
		ah->meth=X509_asn1_meth();
		if ((ah=d2i_ASN1_HEADER(&ah,&p,(long)size)) == NULL)
			goto end;
		x=(X509 *)ah->data;
		ah->data=NULL;
	}
	else if (format == FORMAT_PEM)
		x=PEM_read_bio_X509_AUX(cert,NULL,
			(pem_password_cb *)password_callback, NULL);
	else if (format == FORMAT_PKCS12)
	{
		if (!load_pkcs12(err, cert,cert_descrip, NULL, NULL,
					NULL, &x, NULL))
			goto end;
	}
	else {
		BIO_printf(err,"bad input format specified for %s\n",
			cert_descrip);
		goto end;
	}
end:
	if (x == NULL)
	{
		BIO_printf(err,"unable to load certificate\n");
		ERR_print_errors(err);
	}
	if (ah != NULL) ASN1_HEADER_free(ah);
	if (cert != NULL) BIO_free(cert);
	if (buf != NULL) BUF_MEM_free(buf);
	return(x);
}

EVP_PKEY *load_key(BIO *err, const char *file, int format, int maybe_stdin,
	const char *pass, ENGINE *e, const char *key_descrip)
{
	BIO *key=NULL;
	EVP_PKEY *pkey=NULL;
	PW_CB_DATA cb_data;

	cb_data.password = pass;
	cb_data.prompt_info = file;

	if (file == NULL && (!maybe_stdin || format == FORMAT_ENGINE))
	{
		BIO_printf(err,"no keyfile specified\n");
		goto end;
	}
#ifndef OPENSSL_NO_ENGINE
	if (format == FORMAT_ENGINE)
	{
		if (!e)
			BIO_printf(bio_err,"no engine specified\n");
		else
			pkey = ENGINE_load_private_key(e, file,
				ui_method, &cb_data);
		goto end;
	}
#endif
	key=BIO_new(BIO_s_file());
	if (key == NULL)
	{
		ERR_print_errors(err);
		goto end;
	}
	if (file == NULL && maybe_stdin)
	{
		setvbuf(stdin, NULL, _IONBF, 0);
		BIO_set_fp(key,stdin,BIO_NOCLOSE);
	}
	else
		if (BIO_read_filename(key,file) <= 0)
		{
			BIO_printf(err, "Error opening %s %s\n",
				key_descrip, file);
			ERR_print_errors(err);
			goto end;
		}
	if (format == FORMAT_ASN1)
	{
		pkey=d2i_PrivateKey_bio(key, NULL);
	}
	else if (format == FORMAT_PEM)
	{
		pkey=PEM_read_bio_PrivateKey(key,NULL,
			(pem_password_cb *)password_callback, &cb_data);
	}
#if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_RSA)
	else if (format == FORMAT_NETSCAPE || format == FORMAT_IISSGC)
		pkey = load_netscape_key(err, key, file, key_descrip, format);
#endif
	else if (format == FORMAT_PKCS12)
	{
		if (!load_pkcs12(err, key, key_descrip,
				(pem_password_cb *)password_callback, &cb_data,
				&pkey, NULL, NULL))
			goto end;
	}
	else
	{
		BIO_printf(err,"bad input format specified for key file\n");
		goto end;
	}
 end:
	if (key != NULL) BIO_free(key);
	if (pkey == NULL)
		BIO_printf(err,"unable to load %s\n", key_descrip);
	return(pkey);
}

EVP_PKEY *load_pubkey(BIO *err, const char *file, int format, int maybe_stdin,
	const char *pass, ENGINE *e, const char *key_descrip)
{
	BIO *key=NULL;
	EVP_PKEY *pkey=NULL;
	PW_CB_DATA cb_data;

	cb_data.password = pass;
	cb_data.prompt_info = file;

	if (file == NULL && (!maybe_stdin || format == FORMAT_ENGINE))
	{
		BIO_printf(err,"no keyfile specified\n");
		goto end;
	}
#ifndef OPENSSL_NO_ENGINE
	if (format == FORMAT_ENGINE)
	{
		if (!e)
			BIO_printf(bio_err,"no engine specified\n");
		else
			pkey = ENGINE_load_public_key(e, file,
				ui_method, &cb_data);
		goto end;
	}
#endif
	key=BIO_new(BIO_s_file());
	if (key == NULL)
	{
		ERR_print_errors(err);
		goto end;
	}
	if (file == NULL && maybe_stdin)
	{
		setvbuf(stdin, NULL, _IONBF, 0);
		BIO_set_fp(key,stdin,BIO_NOCLOSE);
	}
	else if (BIO_read_filename(key,file) <= 0)
	{
		BIO_printf(err, "Error opening %s %s\n",
			key_descrip, file);
		ERR_print_errors(err);
		goto end;
	}

	if (format == FORMAT_ASN1)
	{
		pkey=d2i_PUBKEY_bio(key, NULL);
	}
	else if (format == FORMAT_PEM)
	{
		pkey=PEM_read_bio_PUBKEY(key,NULL,
			(pem_password_cb *)password_callback, &cb_data);
	}
#if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_RSA)
	else if (format == FORMAT_NETSCAPE || format == FORMAT_IISSGC)
		pkey = load_netscape_key(err, key, file, key_descrip, format);
#endif
	else
	{
		BIO_printf(err,"bad input format specified for key file\n");
		goto end;
	}
 end:
	if (key != NULL) BIO_free(key);
	if (pkey == NULL)
		BIO_printf(err,"unable to load %s\n", key_descrip);
	return(pkey);
}

#if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_RSA)
static EVP_PKEY *
load_netscape_key(BIO *err, BIO *key, const char *file,
		const char *key_descrip, int format)
{
	EVP_PKEY *pkey;
	BUF_MEM *buf;
	RSA	*rsa;
	const unsigned char *p;
	int size, i;

	buf=BUF_MEM_new();
	pkey = EVP_PKEY_new();
	size = 0;
	if (buf == NULL || pkey == NULL)
		goto error;
	for (;;)
	{
		if (!BUF_MEM_grow_clean(buf,size+1024*10))
			goto error;
		i = BIO_read(key, &(buf->data[size]), 1024*10);
		size += i;
		if (i == 0)
			break;
		if (i < 0)
		{
				BIO_printf(err, "Error reading %s %s",
					key_descrip, file);
				goto error;
		}
	}
	p=(unsigned char *)buf->data;
	rsa = d2i_RSA_NET(NULL,&p,(long)size,NULL,
		(format == FORMAT_IISSGC ? 1 : 0));
	if (rsa == NULL)
		goto error;