70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
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/*
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Copyright (c) 2020 <bakasura@protonmail.ch>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include "utils.h"
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/**
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* Calculate the length of Base64-encoded string
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*
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* @param plaintext_len Size of clear text to encode
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* @return Size of encoded string
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*/
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unsigned long base64_len(size_t plaintext_len) {
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int length_unpadded = (4 * plaintext_len) / 3;
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/* Add padding */
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return length_unpadded % 4 != 0 ? length_unpadded + (4 - length_unpadded % 4) : length_unpadded;
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}
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/**
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* Calculate the length of BlowcryptBase64-encoded string
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*
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* @param plaintext_len Size of clear text to encode
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* @return Size of encoded string
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*/
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unsigned long base64_fish_len(size_t plaintext_len) {
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int length_unpadded = (12 * plaintext_len) / 8;
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/* Add padding */
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return length_unpadded % 12 != 0 ? length_unpadded + (12 - length_unpadded % 12) : length_unpadded;
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}
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/**
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* Calculate the length of fish-encrypted string in CBC mode
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*
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* @param plaintext_len Size of clear text to encode
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* @return Size of encoded string
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*/
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unsigned long cbc_len(size_t plaintext_len) {
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/*IV + DATA + Zero Padding */
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return base64_len(8 + (plaintext_len % 8 != 0 ? plaintext_len + 8 - (plaintext_len % 8) : plaintext_len));
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}
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/**
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* Calculate the length of fish-encrypted string in ECB mode
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*
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* @param plaintext_len Size of clear text to encode
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* @return Size of encoded string
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*/
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unsigned long ecb_len(size_t plaintext_len) {
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return base64_fish_len(plaintext_len);
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}
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