414 lines
12 KiB
C
414 lines
12 KiB
C
/* $NetBSD: rijndael.c,v 1.2 2001/04/10 08:07:59 itojun Exp $ */
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/* $OpenBSD: rijndael.c,v 1.7 2001/02/04 15:32:24 stevesk Exp $ */
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/* This is an independent implementation of the encryption algorithm: */
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/* */
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/* RIJNDAEL by Joan Daemen and Vincent Rijmen */
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/* */
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/* which is a candidate algorithm in the Advanced Encryption Standard */
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/* programme of the US National Institute of Standards and Technology. */
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/* */
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/* Copyright in this implementation is held by Dr B R Gladman but I */
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/* hereby give permission for its free direct or derivative use subject */
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/* to acknowledgment of its origin and compliance with any conditions */
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/* that the originators of the algorithm place on its exploitation. */
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/* */
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/* Dr Brian Gladman (gladman@seven77.demon.co.uk) 14th January 1999 */
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/* Timing data for Rijndael (rijndael.c)
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Algorithm: rijndael (rijndael.c)
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128 bit key:
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Key Setup: 305/1389 cycles (encrypt/decrypt)
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Encrypt: 374 cycles = 68.4 mbits/sec
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Decrypt: 352 cycles = 72.7 mbits/sec
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Mean: 363 cycles = 70.5 mbits/sec
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192 bit key:
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Key Setup: 277/1595 cycles (encrypt/decrypt)
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Encrypt: 439 cycles = 58.3 mbits/sec
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Decrypt: 425 cycles = 60.2 mbits/sec
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Mean: 432 cycles = 59.3 mbits/sec
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256 bit key:
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Key Setup: 374/1960 cycles (encrypt/decrypt)
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Encrypt: 502 cycles = 51.0 mbits/sec
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Decrypt: 498 cycles = 51.4 mbits/sec
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Mean: 500 cycles = 51.2 mbits/sec
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*/
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#include <sys/types.h>
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#include "rijndael.h"
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void gen_tabs __P((void));
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/* 3. Basic macros for speeding up generic operations */
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/* Circular rotate of 32 bit values */
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#define rotr(x,n) (((x) >> ((int)(n))) | ((x) << (32 - (int)(n))))
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#define rotl(x,n) (((x) << ((int)(n))) | ((x) >> (32 - (int)(n))))
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/* Invert byte order in a 32 bit variable */
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#define bswap(x) ((rotl(x, 8) & 0x00ff00ff) | (rotr(x, 8) & 0xff00ff00))
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/* Extract byte from a 32 bit quantity (little endian notation) */
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#define byte(x,n) ((u1byte)((x) >> (8 * n)))
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#if BYTE_ORDER != LITTLE_ENDIAN
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#define BYTE_SWAP
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#endif
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#ifdef BYTE_SWAP
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#define io_swap(x) bswap(x)
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#else
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#define io_swap(x) (x)
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#endif
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#define LARGE_TABLES
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u1byte pow_tab[256];
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u1byte log_tab[256];
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u1byte sbx_tab[256];
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u1byte isb_tab[256];
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u4byte rco_tab[ 10];
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u4byte ft_tab[4][256];
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u4byte it_tab[4][256];
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#ifdef LARGE_TABLES
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u4byte fl_tab[4][256];
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u4byte il_tab[4][256];
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#endif
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u4byte tab_gen = 0;
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#define ff_mult(a,b) (a && b ? pow_tab[(log_tab[a] + log_tab[b]) % 255] : 0)
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#define f_rn(bo, bi, n, k) \
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bo[n] = ft_tab[0][byte(bi[n],0)] ^ \
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ft_tab[1][byte(bi[(n + 1) & 3],1)] ^ \
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ft_tab[2][byte(bi[(n + 2) & 3],2)] ^ \
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ft_tab[3][byte(bi[(n + 3) & 3],3)] ^ *(k + n)
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#define i_rn(bo, bi, n, k) \
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bo[n] = it_tab[0][byte(bi[n],0)] ^ \
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it_tab[1][byte(bi[(n + 3) & 3],1)] ^ \
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it_tab[2][byte(bi[(n + 2) & 3],2)] ^ \
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it_tab[3][byte(bi[(n + 1) & 3],3)] ^ *(k + n)
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#ifdef LARGE_TABLES
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#define ls_box(x) \
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( fl_tab[0][byte(x, 0)] ^ \
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fl_tab[1][byte(x, 1)] ^ \
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fl_tab[2][byte(x, 2)] ^ \
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fl_tab[3][byte(x, 3)] )
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#define f_rl(bo, bi, n, k) \
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bo[n] = fl_tab[0][byte(bi[n],0)] ^ \
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fl_tab[1][byte(bi[(n + 1) & 3],1)] ^ \
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fl_tab[2][byte(bi[(n + 2) & 3],2)] ^ \
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fl_tab[3][byte(bi[(n + 3) & 3],3)] ^ *(k + n)
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#define i_rl(bo, bi, n, k) \
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bo[n] = il_tab[0][byte(bi[n],0)] ^ \
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il_tab[1][byte(bi[(n + 3) & 3],1)] ^ \
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il_tab[2][byte(bi[(n + 2) & 3],2)] ^ \
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il_tab[3][byte(bi[(n + 1) & 3],3)] ^ *(k + n)
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#else
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#define ls_box(x) \
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((u4byte)sbx_tab[byte(x, 0)] << 0) ^ \
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((u4byte)sbx_tab[byte(x, 1)] << 8) ^ \
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((u4byte)sbx_tab[byte(x, 2)] << 16) ^ \
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((u4byte)sbx_tab[byte(x, 3)] << 24)
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#define f_rl(bo, bi, n, k) \
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bo[n] = (u4byte)sbx_tab[byte(bi[n],0)] ^ \
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rotl(((u4byte)sbx_tab[byte(bi[(n + 1) & 3],1)]), 8) ^ \
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rotl(((u4byte)sbx_tab[byte(bi[(n + 2) & 3],2)]), 16) ^ \
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rotl(((u4byte)sbx_tab[byte(bi[(n + 3) & 3],3)]), 24) ^ *(k + n)
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#define i_rl(bo, bi, n, k) \
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bo[n] = (u4byte)isb_tab[byte(bi[n],0)] ^ \
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rotl(((u4byte)isb_tab[byte(bi[(n + 3) & 3],1)]), 8) ^ \
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rotl(((u4byte)isb_tab[byte(bi[(n + 2) & 3],2)]), 16) ^ \
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rotl(((u4byte)isb_tab[byte(bi[(n + 1) & 3],3)]), 24) ^ *(k + n)
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#endif
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void
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gen_tabs(void)
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{
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u4byte i, t;
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u1byte p, q;
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/* log and power tables for GF(2**8) finite field with */
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/* 0x11b as modular polynomial - the simplest prmitive */
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/* root is 0x11, used here to generate the tables */
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for(i = 0,p = 1; i < 256; ++i) {
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pow_tab[i] = (u1byte)p; log_tab[p] = (u1byte)i;
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p = p ^ (p << 1) ^ (p & 0x80 ? 0x01b : 0);
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}
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log_tab[1] = 0; p = 1;
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for(i = 0; i < 10; ++i) {
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rco_tab[i] = p;
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p = (p << 1) ^ (p & 0x80 ? 0x1b : 0);
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}
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/* note that the affine byte transformation matrix in */
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/* rijndael specification is in big endian format with */
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/* bit 0 as the most significant bit. In the remainder */
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/* of the specification the bits are numbered from the */
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/* least significant end of a byte. */
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for(i = 0; i < 256; ++i) {
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p = (i ? pow_tab[255 - log_tab[i]] : 0); q = p;
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q = (q >> 7) | (q << 1); p ^= q;
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q = (q >> 7) | (q << 1); p ^= q;
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q = (q >> 7) | (q << 1); p ^= q;
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q = (q >> 7) | (q << 1); p ^= q ^ 0x63;
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sbx_tab[i] = (u1byte)p; isb_tab[p] = (u1byte)i;
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}
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for(i = 0; i < 256; ++i) {
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p = sbx_tab[i];
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#ifdef LARGE_TABLES
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t = p; fl_tab[0][i] = t;
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fl_tab[1][i] = rotl(t, 8);
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fl_tab[2][i] = rotl(t, 16);
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fl_tab[3][i] = rotl(t, 24);
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#endif
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t = ((u4byte)ff_mult(2, p)) |
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((u4byte)p << 8) |
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((u4byte)p << 16) |
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((u4byte)ff_mult(3, p) << 24);
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ft_tab[0][i] = t;
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ft_tab[1][i] = rotl(t, 8);
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ft_tab[2][i] = rotl(t, 16);
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ft_tab[3][i] = rotl(t, 24);
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p = isb_tab[i];
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#ifdef LARGE_TABLES
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t = p; il_tab[0][i] = t;
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il_tab[1][i] = rotl(t, 8);
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il_tab[2][i] = rotl(t, 16);
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il_tab[3][i] = rotl(t, 24);
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#endif
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t = ((u4byte)ff_mult(14, p)) |
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((u4byte)ff_mult( 9, p) << 8) |
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((u4byte)ff_mult(13, p) << 16) |
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((u4byte)ff_mult(11, p) << 24);
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it_tab[0][i] = t;
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it_tab[1][i] = rotl(t, 8);
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it_tab[2][i] = rotl(t, 16);
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it_tab[3][i] = rotl(t, 24);
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}
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tab_gen = 1;
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}
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#define star_x(x) (((x) & 0x7f7f7f7f) << 1) ^ ((((x) & 0x80808080) >> 7) * 0x1b)
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#define imix_col(y,x) \
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u = star_x(x); \
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v = star_x(u); \
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w = star_x(v); \
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t = w ^ (x); \
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(y) = u ^ v ^ w; \
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(y) ^= rotr(u ^ t, 8) ^ \
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rotr(v ^ t, 16) ^ \
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rotr(t,24)
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/* initialise the key schedule from the user supplied key */
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#define loop4(i) \
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{ t = ls_box(rotr(t, 8)) ^ rco_tab[i]; \
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t ^= e_key[4 * i]; e_key[4 * i + 4] = t; \
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t ^= e_key[4 * i + 1]; e_key[4 * i + 5] = t; \
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t ^= e_key[4 * i + 2]; e_key[4 * i + 6] = t; \
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t ^= e_key[4 * i + 3]; e_key[4 * i + 7] = t; \
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}
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#define loop6(i) \
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{ t = ls_box(rotr(t, 8)) ^ rco_tab[i]; \
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t ^= e_key[6 * i]; e_key[6 * i + 6] = t; \
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t ^= e_key[6 * i + 1]; e_key[6 * i + 7] = t; \
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t ^= e_key[6 * i + 2]; e_key[6 * i + 8] = t; \
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t ^= e_key[6 * i + 3]; e_key[6 * i + 9] = t; \
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t ^= e_key[6 * i + 4]; e_key[6 * i + 10] = t; \
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t ^= e_key[6 * i + 5]; e_key[6 * i + 11] = t; \
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}
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#define loop8(i) \
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{ t = ls_box(rotr(t, 8)) ^ rco_tab[i]; \
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t ^= e_key[8 * i]; e_key[8 * i + 8] = t; \
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t ^= e_key[8 * i + 1]; e_key[8 * i + 9] = t; \
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t ^= e_key[8 * i + 2]; e_key[8 * i + 10] = t; \
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t ^= e_key[8 * i + 3]; e_key[8 * i + 11] = t; \
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t = e_key[8 * i + 4] ^ ls_box(t); \
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e_key[8 * i + 12] = t; \
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t ^= e_key[8 * i + 5]; e_key[8 * i + 13] = t; \
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t ^= e_key[8 * i + 6]; e_key[8 * i + 14] = t; \
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t ^= e_key[8 * i + 7]; e_key[8 * i + 15] = t; \
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}
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rijndael_ctx *
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rijndael_set_key(rijndael_ctx *ctx, const u4byte *in_key, const u4byte key_len,
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int encrypt)
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{
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u4byte i, t, u, v, w;
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u4byte *e_key = ctx->e_key;
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u4byte *d_key = ctx->d_key;
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ctx->decrypt = !encrypt;
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if(!tab_gen)
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gen_tabs();
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ctx->k_len = (key_len + 31) / 32;
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e_key[0] = io_swap(in_key[0]); e_key[1] = io_swap(in_key[1]);
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e_key[2] = io_swap(in_key[2]); e_key[3] = io_swap(in_key[3]);
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switch(ctx->k_len) {
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case 4: t = e_key[3];
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for(i = 0; i < 10; ++i)
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loop4(i);
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break;
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case 6: e_key[4] = io_swap(in_key[4]); t = e_key[5] = io_swap(in_key[5]);
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for(i = 0; i < 8; ++i)
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loop6(i);
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break;
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case 8: e_key[4] = io_swap(in_key[4]); e_key[5] = io_swap(in_key[5]);
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e_key[6] = io_swap(in_key[6]); t = e_key[7] = io_swap(in_key[7]);
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for(i = 0; i < 7; ++i)
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loop8(i);
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break;
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}
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if (!encrypt) {
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d_key[0] = e_key[0]; d_key[1] = e_key[1];
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d_key[2] = e_key[2]; d_key[3] = e_key[3];
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for(i = 4; i < 4 * ctx->k_len + 24; ++i) {
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imix_col(d_key[i], e_key[i]);
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}
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}
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return ctx;
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}
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/* encrypt a block of text */
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#define f_nround(bo, bi, k) \
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f_rn(bo, bi, 0, k); \
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f_rn(bo, bi, 1, k); \
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f_rn(bo, bi, 2, k); \
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f_rn(bo, bi, 3, k); \
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k += 4
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#define f_lround(bo, bi, k) \
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f_rl(bo, bi, 0, k); \
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f_rl(bo, bi, 1, k); \
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f_rl(bo, bi, 2, k); \
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f_rl(bo, bi, 3, k)
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void
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rijndael_encrypt(rijndael_ctx *ctx, const u4byte *in_blk, u4byte *out_blk)
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{
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u4byte k_len = ctx->k_len;
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u4byte *e_key = ctx->e_key;
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u4byte b0[4], b1[4], *kp;
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b0[0] = io_swap(in_blk[0]) ^ e_key[0];
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b0[1] = io_swap(in_blk[1]) ^ e_key[1];
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b0[2] = io_swap(in_blk[2]) ^ e_key[2];
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b0[3] = io_swap(in_blk[3]) ^ e_key[3];
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kp = e_key + 4;
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if(k_len > 6) {
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f_nround(b1, b0, kp); f_nround(b0, b1, kp);
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}
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if(k_len > 4) {
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f_nround(b1, b0, kp); f_nround(b0, b1, kp);
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}
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f_nround(b1, b0, kp); f_nround(b0, b1, kp);
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f_nround(b1, b0, kp); f_nround(b0, b1, kp);
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f_nround(b1, b0, kp); f_nround(b0, b1, kp);
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f_nround(b1, b0, kp); f_nround(b0, b1, kp);
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f_nround(b1, b0, kp); f_lround(b0, b1, kp);
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out_blk[0] = io_swap(b0[0]); out_blk[1] = io_swap(b0[1]);
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out_blk[2] = io_swap(b0[2]); out_blk[3] = io_swap(b0[3]);
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}
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/* decrypt a block of text */
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#define i_nround(bo, bi, k) \
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i_rn(bo, bi, 0, k); \
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i_rn(bo, bi, 1, k); \
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i_rn(bo, bi, 2, k); \
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i_rn(bo, bi, 3, k); \
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k -= 4
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#define i_lround(bo, bi, k) \
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i_rl(bo, bi, 0, k); \
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i_rl(bo, bi, 1, k); \
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i_rl(bo, bi, 2, k); \
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i_rl(bo, bi, 3, k)
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void
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rijndael_decrypt(rijndael_ctx *ctx, const u4byte *in_blk, u4byte *out_blk)
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{
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u4byte b0[4], b1[4], *kp;
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u4byte k_len = ctx->k_len;
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u4byte *e_key = ctx->e_key;
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u4byte *d_key = ctx->d_key;
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b0[0] = io_swap(in_blk[0]) ^ e_key[4 * k_len + 24];
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b0[1] = io_swap(in_blk[1]) ^ e_key[4 * k_len + 25];
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b0[2] = io_swap(in_blk[2]) ^ e_key[4 * k_len + 26];
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b0[3] = io_swap(in_blk[3]) ^ e_key[4 * k_len + 27];
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kp = d_key + 4 * (k_len + 5);
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if(k_len > 6) {
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i_nround(b1, b0, kp); i_nround(b0, b1, kp);
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}
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if(k_len > 4) {
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i_nround(b1, b0, kp); i_nround(b0, b1, kp);
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}
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i_nround(b1, b0, kp); i_nround(b0, b1, kp);
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i_nround(b1, b0, kp); i_nround(b0, b1, kp);
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i_nround(b1, b0, kp); i_nround(b0, b1, kp);
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i_nround(b1, b0, kp); i_nround(b0, b1, kp);
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i_nround(b1, b0, kp); i_lround(b0, b1, kp);
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out_blk[0] = io_swap(b0[0]); out_blk[1] = io_swap(b0[1]);
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out_blk[2] = io_swap(b0[2]); out_blk[3] = io_swap(b0[3]);
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}
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