/* * QEMU Crypto XTS cipher mode * * Copyright (c) 2015-2016 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see <http://www.gnu.org/licenses/>. * * This code is originally derived from public domain / WTFPL code in * LibTomCrypt crytographic library http://libtom.org. The XTS code * was donated by Elliptic Semiconductor Inc (www.ellipticsemi.com) * to the LibTom Projects * */ #ifndef QCRYPTO_XTS_H #define QCRYPTO_XTS_H #define XTS_BLOCK_SIZE 16 typedef void xts_cipher_func(const void *ctx, size_t length, uint8_t *dst, const uint8_t *src); /** * xts_decrypt: * @datactx: the cipher context for data decryption * @tweakctx: the cipher context for tweak decryption * @encfunc: the cipher function for encryption * @decfunc: the cipher function for decryption * @iv: the initialization vector tweak of XTS_BLOCK_SIZE bytes * @length: the length of @dst and @src * @dst: buffer to hold the decrypted plaintext * @src: buffer providing the ciphertext * * Decrypts @src into @dst */ void xts_decrypt(const void *datactx, const void *tweakctx, xts_cipher_func *encfunc, xts_cipher_func *decfunc, uint8_t *iv, size_t length, uint8_t *dst, const uint8_t *src); /** * xts_decrypt: * @datactx: the cipher context for data encryption * @tweakctx: the cipher context for tweak encryption * @encfunc: the cipher function for encryption * @decfunc: the cipher function for decryption * @iv: the initialization vector tweak of XTS_BLOCK_SIZE bytes * @length: the length of @dst and @src * @dst: buffer to hold the encrypted ciphertext * @src: buffer providing the plaintext * * Decrypts @src into @dst */ void xts_encrypt(const void *datactx, const void *tweakctx, xts_cipher_func *encfunc, xts_cipher_func *decfunc, uint8_t *iv, size_t length, uint8_t *dst, const uint8_t *src); #endif /* QCRYPTO_XTS_H */