81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Koichiro Iwao 2017
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Base64 encoder / decoder
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*/
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#if defined(HAVE_CONFIG_H)
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#include <config_ac.h>
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#endif
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#include "string_calls.h"
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#include <openssl/bio.h>
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#include <openssl/evp.h>
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size_t
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base64_decoded_bytes(const char *src)
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{
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size_t len;
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size_t padding;
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len = g_strlen(src);
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padding = 0;
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if (src[len - 1] == '=')
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{
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padding++;
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if (src[len - 2] == '=')
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{
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padding++;
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}
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}
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return len * 3 / 4 - padding;
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}
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/*****************************************************************************/
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char *
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base64_decode(char *dst, const char *src, size_t len)
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{
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BIO *b64;
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BIO *bio;
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char *b64str;
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size_t estimated_decoded_bytes;
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size_t decoded_bytes;
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b64str = g_strdup(src);
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estimated_decoded_bytes = base64_decoded_bytes(b64str);
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dst[estimated_decoded_bytes] = '\0';
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b64 = BIO_new(BIO_f_base64());
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bio = BIO_new_mem_buf(b64str, len);
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bio = BIO_push(b64, bio);
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BIO_set_flags(bio, BIO_FLAGS_BASE64_NO_NL);
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decoded_bytes = BIO_read(bio, dst, len);
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BIO_free_all(bio);
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/* if input is corrupt, return empty string */
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if (estimated_decoded_bytes != decoded_bytes)
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{
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g_strncpy(dst, "", sizeof(""));
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}
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return dst;
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}
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