399 lines
8.8 KiB
C
399 lines
8.8 KiB
C
/*
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* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "inner.h"
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/* see inner.h */
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void
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br_aes_ct64_bitslice_Sbox(uint64_t *q)
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{
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/*
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* This S-box implementation is a straightforward translation of
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* the circuit described by Boyar and Peralta in "A new
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* combinational logic minimization technique with applications
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* to cryptology" (https://eprint.iacr.org/2009/191.pdf).
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*
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* Note that variables x* (input) and s* (output) are numbered
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* in "reverse" order (x0 is the high bit, x7 is the low bit).
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*/
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uint64_t x0, x1, x2, x3, x4, x5, x6, x7;
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uint64_t y1, y2, y3, y4, y5, y6, y7, y8, y9;
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uint64_t y10, y11, y12, y13, y14, y15, y16, y17, y18, y19;
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uint64_t y20, y21;
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uint64_t z0, z1, z2, z3, z4, z5, z6, z7, z8, z9;
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uint64_t z10, z11, z12, z13, z14, z15, z16, z17;
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uint64_t t0, t1, t2, t3, t4, t5, t6, t7, t8, t9;
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uint64_t t10, t11, t12, t13, t14, t15, t16, t17, t18, t19;
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uint64_t t20, t21, t22, t23, t24, t25, t26, t27, t28, t29;
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uint64_t t30, t31, t32, t33, t34, t35, t36, t37, t38, t39;
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uint64_t t40, t41, t42, t43, t44, t45, t46, t47, t48, t49;
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uint64_t t50, t51, t52, t53, t54, t55, t56, t57, t58, t59;
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uint64_t t60, t61, t62, t63, t64, t65, t66, t67;
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uint64_t s0, s1, s2, s3, s4, s5, s6, s7;
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x0 = q[7];
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x1 = q[6];
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x2 = q[5];
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x3 = q[4];
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x4 = q[3];
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x5 = q[2];
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x6 = q[1];
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x7 = q[0];
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/*
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* Top linear transformation.
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*/
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y14 = x3 ^ x5;
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y13 = x0 ^ x6;
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y9 = x0 ^ x3;
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y8 = x0 ^ x5;
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t0 = x1 ^ x2;
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y1 = t0 ^ x7;
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y4 = y1 ^ x3;
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y12 = y13 ^ y14;
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y2 = y1 ^ x0;
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y5 = y1 ^ x6;
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y3 = y5 ^ y8;
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t1 = x4 ^ y12;
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y15 = t1 ^ x5;
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y20 = t1 ^ x1;
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y6 = y15 ^ x7;
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y10 = y15 ^ t0;
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y11 = y20 ^ y9;
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y7 = x7 ^ y11;
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y17 = y10 ^ y11;
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y19 = y10 ^ y8;
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y16 = t0 ^ y11;
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y21 = y13 ^ y16;
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y18 = x0 ^ y16;
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/*
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* Non-linear section.
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*/
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t2 = y12 & y15;
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t3 = y3 & y6;
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t4 = t3 ^ t2;
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t5 = y4 & x7;
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t6 = t5 ^ t2;
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t7 = y13 & y16;
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t8 = y5 & y1;
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t9 = t8 ^ t7;
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t10 = y2 & y7;
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t11 = t10 ^ t7;
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t12 = y9 & y11;
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t13 = y14 & y17;
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t14 = t13 ^ t12;
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t15 = y8 & y10;
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t16 = t15 ^ t12;
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t17 = t4 ^ t14;
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t18 = t6 ^ t16;
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t19 = t9 ^ t14;
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t20 = t11 ^ t16;
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t21 = t17 ^ y20;
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t22 = t18 ^ y19;
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t23 = t19 ^ y21;
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t24 = t20 ^ y18;
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t25 = t21 ^ t22;
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t26 = t21 & t23;
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t27 = t24 ^ t26;
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t28 = t25 & t27;
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t29 = t28 ^ t22;
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t30 = t23 ^ t24;
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t31 = t22 ^ t26;
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t32 = t31 & t30;
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t33 = t32 ^ t24;
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t34 = t23 ^ t33;
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t35 = t27 ^ t33;
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t36 = t24 & t35;
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t37 = t36 ^ t34;
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t38 = t27 ^ t36;
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t39 = t29 & t38;
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t40 = t25 ^ t39;
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t41 = t40 ^ t37;
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t42 = t29 ^ t33;
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t43 = t29 ^ t40;
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t44 = t33 ^ t37;
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t45 = t42 ^ t41;
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z0 = t44 & y15;
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z1 = t37 & y6;
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z2 = t33 & x7;
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z3 = t43 & y16;
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z4 = t40 & y1;
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z5 = t29 & y7;
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z6 = t42 & y11;
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z7 = t45 & y17;
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z8 = t41 & y10;
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z9 = t44 & y12;
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z10 = t37 & y3;
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z11 = t33 & y4;
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z12 = t43 & y13;
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z13 = t40 & y5;
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z14 = t29 & y2;
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z15 = t42 & y9;
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z16 = t45 & y14;
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z17 = t41 & y8;
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/*
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* Bottom linear transformation.
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*/
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t46 = z15 ^ z16;
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t47 = z10 ^ z11;
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t48 = z5 ^ z13;
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t49 = z9 ^ z10;
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t50 = z2 ^ z12;
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t51 = z2 ^ z5;
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t52 = z7 ^ z8;
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t53 = z0 ^ z3;
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t54 = z6 ^ z7;
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t55 = z16 ^ z17;
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t56 = z12 ^ t48;
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t57 = t50 ^ t53;
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t58 = z4 ^ t46;
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t59 = z3 ^ t54;
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t60 = t46 ^ t57;
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t61 = z14 ^ t57;
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t62 = t52 ^ t58;
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t63 = t49 ^ t58;
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t64 = z4 ^ t59;
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t65 = t61 ^ t62;
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t66 = z1 ^ t63;
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s0 = t59 ^ t63;
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s6 = t56 ^ ~t62;
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s7 = t48 ^ ~t60;
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t67 = t64 ^ t65;
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s3 = t53 ^ t66;
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s4 = t51 ^ t66;
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s5 = t47 ^ t65;
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s1 = t64 ^ ~s3;
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s2 = t55 ^ ~t67;
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q[7] = s0;
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q[6] = s1;
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q[5] = s2;
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q[4] = s3;
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q[3] = s4;
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q[2] = s5;
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q[1] = s6;
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q[0] = s7;
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}
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/* see inner.h */
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void
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br_aes_ct64_ortho(uint64_t *q)
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{
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#define SWAPN(cl, ch, s, x, y) do { \
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uint64_t a, b; \
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a = (x); \
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b = (y); \
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(x) = (a & (uint64_t)cl) | ((b & (uint64_t)cl) << (s)); \
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(y) = ((a & (uint64_t)ch) >> (s)) | (b & (uint64_t)ch); \
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} while (0)
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#define SWAP2(x, y) SWAPN(0x5555555555555555, 0xAAAAAAAAAAAAAAAA, 1, x, y)
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#define SWAP4(x, y) SWAPN(0x3333333333333333, 0xCCCCCCCCCCCCCCCC, 2, x, y)
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#define SWAP8(x, y) SWAPN(0x0F0F0F0F0F0F0F0F, 0xF0F0F0F0F0F0F0F0, 4, x, y)
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SWAP2(q[0], q[1]);
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SWAP2(q[2], q[3]);
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SWAP2(q[4], q[5]);
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SWAP2(q[6], q[7]);
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SWAP4(q[0], q[2]);
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SWAP4(q[1], q[3]);
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SWAP4(q[4], q[6]);
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SWAP4(q[5], q[7]);
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SWAP8(q[0], q[4]);
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SWAP8(q[1], q[5]);
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SWAP8(q[2], q[6]);
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SWAP8(q[3], q[7]);
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}
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/* see inner.h */
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void
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br_aes_ct64_interleave_in(uint64_t *q0, uint64_t *q1, const uint32_t *w)
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{
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uint64_t x0, x1, x2, x3;
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x0 = w[0];
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x1 = w[1];
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x2 = w[2];
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x3 = w[3];
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x0 |= (x0 << 16);
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x1 |= (x1 << 16);
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x2 |= (x2 << 16);
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x3 |= (x3 << 16);
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x0 &= (uint64_t)0x0000FFFF0000FFFF;
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x1 &= (uint64_t)0x0000FFFF0000FFFF;
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x2 &= (uint64_t)0x0000FFFF0000FFFF;
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x3 &= (uint64_t)0x0000FFFF0000FFFF;
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x0 |= (x0 << 8);
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x1 |= (x1 << 8);
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x2 |= (x2 << 8);
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x3 |= (x3 << 8);
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x0 &= (uint64_t)0x00FF00FF00FF00FF;
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x1 &= (uint64_t)0x00FF00FF00FF00FF;
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x2 &= (uint64_t)0x00FF00FF00FF00FF;
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x3 &= (uint64_t)0x00FF00FF00FF00FF;
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*q0 = x0 | (x2 << 8);
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*q1 = x1 | (x3 << 8);
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}
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/* see inner.h */
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void
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br_aes_ct64_interleave_out(uint32_t *w, uint64_t q0, uint64_t q1)
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{
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uint64_t x0, x1, x2, x3;
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x0 = q0 & (uint64_t)0x00FF00FF00FF00FF;
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x1 = q1 & (uint64_t)0x00FF00FF00FF00FF;
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x2 = (q0 >> 8) & (uint64_t)0x00FF00FF00FF00FF;
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x3 = (q1 >> 8) & (uint64_t)0x00FF00FF00FF00FF;
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x0 |= (x0 >> 8);
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x1 |= (x1 >> 8);
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x2 |= (x2 >> 8);
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x3 |= (x3 >> 8);
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x0 &= (uint64_t)0x0000FFFF0000FFFF;
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x1 &= (uint64_t)0x0000FFFF0000FFFF;
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x2 &= (uint64_t)0x0000FFFF0000FFFF;
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x3 &= (uint64_t)0x0000FFFF0000FFFF;
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w[0] = (uint32_t)x0 | (uint32_t)(x0 >> 16);
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w[1] = (uint32_t)x1 | (uint32_t)(x1 >> 16);
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w[2] = (uint32_t)x2 | (uint32_t)(x2 >> 16);
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w[3] = (uint32_t)x3 | (uint32_t)(x3 >> 16);
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}
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static const unsigned char Rcon[] = {
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0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1B, 0x36
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};
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static uint32_t
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sub_word(uint32_t x)
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{
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uint64_t q[8];
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memset(q, 0, sizeof q);
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q[0] = x;
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br_aes_ct64_ortho(q);
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br_aes_ct64_bitslice_Sbox(q);
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br_aes_ct64_ortho(q);
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return (uint32_t)q[0];
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}
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/* see inner.h */
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unsigned
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br_aes_ct64_keysched(uint64_t *comp_skey, const void *key, size_t key_len)
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{
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unsigned num_rounds;
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int i, j, k, nk, nkf;
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uint32_t tmp;
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uint32_t skey[60];
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switch (key_len) {
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case 16:
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num_rounds = 10;
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break;
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case 24:
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num_rounds = 12;
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break;
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case 32:
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num_rounds = 14;
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break;
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default:
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/* abort(); */
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return 0;
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}
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nk = (int)(key_len >> 2);
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nkf = (int)((num_rounds + 1) << 2);
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br_range_dec32le(skey, (key_len >> 2), key);
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tmp = skey[(key_len >> 2) - 1];
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for (i = nk, j = 0, k = 0; i < nkf; i ++) {
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if (j == 0) {
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tmp = (tmp << 24) | (tmp >> 8);
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tmp = sub_word(tmp) ^ Rcon[k];
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} else if (nk > 6 && j == 4) {
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tmp = sub_word(tmp);
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}
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tmp ^= skey[i - nk];
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skey[i] = tmp;
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if (++ j == nk) {
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j = 0;
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k ++;
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}
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}
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for (i = 0, j = 0; i < nkf; i += 4, j += 2) {
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uint64_t q[8];
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br_aes_ct64_interleave_in(&q[0], &q[4], skey + i);
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q[1] = q[0];
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q[2] = q[0];
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q[3] = q[0];
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q[5] = q[4];
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q[6] = q[4];
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q[7] = q[4];
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br_aes_ct64_ortho(q);
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comp_skey[j + 0] =
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(q[0] & (uint64_t)0x1111111111111111)
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| (q[1] & (uint64_t)0x2222222222222222)
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| (q[2] & (uint64_t)0x4444444444444444)
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| (q[3] & (uint64_t)0x8888888888888888);
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comp_skey[j + 1] =
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(q[4] & (uint64_t)0x1111111111111111)
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| (q[5] & (uint64_t)0x2222222222222222)
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| (q[6] & (uint64_t)0x4444444444444444)
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| (q[7] & (uint64_t)0x8888888888888888);
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}
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return num_rounds;
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}
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/* see inner.h */
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void
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br_aes_ct64_skey_expand(uint64_t *skey,
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unsigned num_rounds, const uint64_t *comp_skey)
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{
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unsigned u, v, n;
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n = (num_rounds + 1) << 1;
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for (u = 0, v = 0; u < n; u ++, v += 4) {
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uint64_t x0, x1, x2, x3;
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x0 = x1 = x2 = x3 = comp_skey[u];
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x0 &= (uint64_t)0x1111111111111111;
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x1 &= (uint64_t)0x2222222222222222;
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x2 &= (uint64_t)0x4444444444444444;
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x3 &= (uint64_t)0x8888888888888888;
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x1 >>= 1;
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x2 >>= 2;
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x3 >>= 3;
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skey[v + 0] = (x0 << 4) - x0;
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skey[v + 1] = (x1 << 4) - x1;
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skey[v + 2] = (x2 << 4) - x2;
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skey[v + 3] = (x3 << 4) - x3;
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}
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}
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