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53 lines
2.0 KiB
C
53 lines
2.0 KiB
C
/**
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Copyright © 2017 Odzhan. All Rights Reserved.
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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 are
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met:
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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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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY AUTHORS "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; 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) ARISING IN
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ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE. */
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#define R(v,n)(((v)>>(n))|((v)<<(64-(n))))
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#define F(n)for(i=0;i<n;i++)
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typedef unsigned long long W;
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void speck128a(void *mk, void *data) {
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W k[2],*x=data,i;
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// copy 128-bit master key to local memory
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k[0]=((W*)mk)[0]; k[1]=((W*)mk)[1];
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// apply 32 rounds
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F(32) {
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// encrypt plaintext
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// linear/nonlinear layers, add key
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x[1] = (R(x[1], 8) + x[0]) ^ k[0];
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x[0] = R(x[0], 61) ^ x[1];
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// create next subkey
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// linear/nonlinear layers, add round counter
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k[1] = (R(k[1], 8) + k[0]) ^ i;
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k[0] = R(k[0], 61) ^ k[1];
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}
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}
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