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83 lines
3.1 KiB
C
83 lines
3.1 KiB
C
/* ====================================================================
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* Copyright (c) 2015 - 2019 The GmSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the GmSSL Project.
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* (http://gmssl.org/)"
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*
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* 4. The name "GmSSL Project" must not be used to endorse or promote
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* products derived from this software without prior written
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* permission. For written permission, please contact
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* guanzhi1980@gmail.com.
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*
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* 5. Products derived from this software may not be called "GmSSL"
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* nor may "GmSSL" appear in their names without prior written
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* permission of the GmSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the GmSSL Project
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* (http://gmssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE GmSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*/
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#include <stdlib.h>
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#include <gmssl/zuc.h>
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static void zuc_set_eea_key(ZUC_STATE *key, const uint8_t user_key[16],
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ZUC_UINT32 count, ZUC_UINT5 bearer, ZUC_BIT direction)
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{
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uint8_t iv[16] = {0};
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iv[0] = iv[8] = count >> 24;
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iv[1] = iv[9] = count >> 16;
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iv[2] = iv[10] = count >> 8;
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iv[3] = iv[11] = count;
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iv[4] = iv[12] = ((bearer << 1) | (direction & 1)) << 2;
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zuc_init(key, user_key, iv);
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}
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void zuc_eea_encrypt(const ZUC_UINT32 *in, ZUC_UINT32 *out, size_t nbits,
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const uint8_t key[16], ZUC_UINT32 count, ZUC_UINT5 bearer,
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ZUC_BIT direction)
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{
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ZUC_STATE zuc_key;
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size_t nwords = (nbits + 31)/32;
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size_t i;
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zuc_set_eea_key(&zuc_key, key, count, bearer, direction);
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zuc_generate_keystream(&zuc_key, nwords, out);
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for (i = 0; i < nwords; i++) {
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out[i] ^= in[i];
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}
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if (nbits % 32 != 0) {
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out[nwords - 1] |= (0xffffffff << (32 - (nbits%32)));
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}
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}
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