Init commit of gmssl-v3

src/pem.c

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2020 - 2021 The GmSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the GmSSL Project.
+ *    (http://gmssl.org/)"
+ *
+ * 4. The name "GmSSL Project" must not be used to endorse or promote
+ *    products derived from this software without prior written
+ *    permission. For written permission, please contact
+ *    guanzhi1980@gmail.com.
+ *
+ * 5. Products derived from this software may not be called "GmSSL"
+ *    nor may "GmSSL" appear in their names without prior written
+ *    permission of the GmSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the GmSSL Project
+ *    (http://gmssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE GmSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <gmssl/pem.h>
+#include <gmssl/error.h>
+
+
+int pem_write(FILE *fp, const char *name, const uint8_t *data, size_t datalen)
+{
+	int ret = 0;
+	BASE64_CTX ctx;
+	uint8_t b64[datalen * 2];
+	int len;
+
+	base64_encode_init(&ctx);
+	base64_encode_update(&ctx, data, (int)datalen, b64, &len);
+	base64_encode_finish(&ctx, b64 + len, &len);
+
+	ret += fprintf(fp, "-----BEGIN %s-----\n", name);
+	ret += fprintf(fp, "%s", (char *)b64);
+	ret += fprintf(fp, "-----END %s-----\n", name);
+	return ret;
+}
+
+int pem_read(FILE *fp, const char *name, uint8_t *data, size_t *datalen)
+{
+	char line[80];
+	char begin_line[80];
+	char end_line[80];
+	int len;
+	BASE64_CTX ctx;
+
+	snprintf(begin_line, sizeof(begin_line), "-----BEGIN %s-----\n", name);
+	snprintf(end_line, sizeof(end_line), "-----END %s-----\n", name);
+
+	if (!fgets(line, sizeof(line), fp)) {
+		//FIXME: feof 判断是不是文件结束了呢
+		return 0;
+	}
+
+	if (strcmp(line, begin_line) != 0) {
+		// FIXME: 这里是不是应该容忍一些错误呢？
+		error_print();
+		return -1;
+	}
+
+	*datalen = 0;
+
+	base64_decode_init(&ctx);
+
+	for (;;) {
+		if (!fgets(line, sizeof(line), fp)) {
+			error_print();
+			return -1;
+		}
+		if (strcmp(line, end_line) == 0) {
+			break;
+		}
+
+		base64_decode_update(&ctx, (uint8_t *)line, strlen(line), data, &len);
+		data += len;
+		*datalen += len;
+	}
+
+	base64_decode_finish(&ctx, data, &len);
+	*datalen += len;
+	return 1;
+}