mirror of
https://github.com/guanzhi/GmSSL.git
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128 lines
2.4 KiB
C
128 lines
2.4 KiB
C
/*
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* Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <gmssl/pem.h>
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#include <gmssl/error.h>
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static int remove_newline(char *line)
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{
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size_t len;
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len = strlen(line);
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if (len >= 2) {
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if (line[len - 2] == '\r' && line[len - 1] == '\n') {
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line[len - 2] = line[len - 1] = 0;
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return 1;
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}
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}
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if (len) {
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if (line[len - 1] == '\n') {
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line[len - 1] = 0;
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return 1;
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}
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}
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return 0; // No newline found, might not be an error
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}
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int pem_write(FILE *fp, const char *name, const uint8_t *data, size_t datalen)
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{
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BASE64_CTX ctx;
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uint8_t out[168];
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int inlen, outlen;
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if (!datalen) {
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error_print();
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return -1;
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}
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if (datalen > INT_MAX) {
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error_print();
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return -1;
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}
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fprintf(fp, "-----BEGIN %s-----\n", name);
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base64_encode_init(&ctx);
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while (datalen) {
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inlen = datalen < 48 ? (int)datalen : 48;
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base64_encode_update(&ctx, data, inlen, out, &outlen);
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fwrite(out, 1, outlen, fp);
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data += inlen;
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datalen -= inlen;
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}
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base64_encode_finish(&ctx, out, &outlen);
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fwrite(out, 1, outlen, fp);
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fprintf(fp, "-----END %s-----\n", name);
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return 1;
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}
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int pem_read(FILE *fp, const char *name, uint8_t *data, size_t *datalen, size_t maxlen)
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{
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char line[80];
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char begin_line[80];
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char end_line[80];
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int len;
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BASE64_CTX ctx;
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snprintf(begin_line, sizeof(begin_line), "-----BEGIN %s-----", name);
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snprintf(end_line, sizeof(end_line), "-----END %s-----", name);
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if (feof(fp)) {
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error_print();
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return 0;
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}
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if (!fgets(line, sizeof(line), fp)) {
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if (feof(fp)) {
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error_print();
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return 0;
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} else {
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error_print();
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return -1;
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}
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}
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remove_newline(line);
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if (strcmp(line, begin_line) != 0) {
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fprintf(stderr, "%s %d: %s\n", __FILE__, __LINE__, line);
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fprintf(stderr, "%s %d: %s\n", __FILE__, __LINE__, begin_line);
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error_print();
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return -1;
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}
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*datalen = 0;
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base64_decode_init(&ctx);
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for (;;) {
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if (!fgets(line, sizeof(line), fp)) {
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error_print();
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return -1;
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}
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remove_newline(line);
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if (strcmp(line, end_line) == 0) {
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break;
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}
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base64_decode_update(&ctx, (uint8_t *)line, (int)strlen(line), data, &len);
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data += len;
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*datalen += len;
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}
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base64_decode_finish(&ctx, data, &len);
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*datalen += len;
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return 1;
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}
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