diff options
Diffstat (limited to 'grub-core/lib/libgcrypt-grub/cipher/idea.c')
| -rw-r--r-- | grub-core/lib/libgcrypt-grub/cipher/idea.c | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/grub-core/lib/libgcrypt-grub/cipher/idea.c b/grub-core/lib/libgcrypt-grub/cipher/idea.c new file mode 100644 index 0000000..52a818f --- /dev/null +++ b/grub-core/lib/libgcrypt-grub/cipher/idea.c @@ -0,0 +1,322 @@ +/* This file was automatically imported with + import_gcry.py. Please don't modify it */ +#include <grub/dl.h> +GRUB_MOD_LICENSE ("GPLv3+"); +/* idea.c - IDEA function + * Copyright 1997, 1998, 1999, 2001 Werner Koch (dd9jn) + * Copyright 2013 g10 Code GmbH + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * WERNER KOCH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER + * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + * Except as contained in this notice, the name of Werner Koch shall not be + * used in advertising or otherwise to promote the sale, use or other dealings + * in this Software without prior written authorization from Werner Koch. + * + * Patents on IDEA have expired: + * Europe: EP0482154 on 2011-05-16, + * Japan: JP3225440 on 2011-05-16, + * U.S.: 5,214,703 on 2012-01-07. + */ + +/* + * Please see http://www.noepatents.org/ to learn why software patents + * are bad for society and what you can do to fight them. + * + * The code herein is based on the one from: + * Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1996. + * ISBN 0-471-11709-9. + */ + + + +#include "types.h" /* for byte and u32 typedefs */ +#include "g10lib.h" +#include "cipher.h" + + +#define IDEA_KEYSIZE 16 +#define IDEA_BLOCKSIZE 8 +#define IDEA_ROUNDS 8 +#define IDEA_KEYLEN (6*IDEA_ROUNDS+4) + +typedef struct { + u16 ek[IDEA_KEYLEN]; + u16 dk[IDEA_KEYLEN]; + int have_dk; +} IDEA_context; + + + +static u16 +mul_inv( u16 x ) +{ + u16 t0, t1; + u16 q, y; + + if( x < 2 ) + return x; + t1 = 0x10001UL / x; + y = 0x10001UL % x; + if( y == 1 ) + return (1-t1) & 0xffff; + + t0 = 1; + do { + q = x / y; + x = x % y; + t0 += q * t1; + if( x == 1 ) + return t0; + q = y / x; + y = y % x; + t1 += q * t0; + } while( y != 1 ); + return (1-t1) & 0xffff; +} + + + +static void +expand_key( const byte *userkey, u16 *ek ) +{ + int i,j; + + for(j=0; j < 8; j++ ) { + ek[j] = (*userkey << 8) + userkey[1]; + userkey += 2; + } + for(i=0; j < IDEA_KEYLEN; j++ ) { + i++; + ek[i+7] = ek[i&7] << 9 | ek[(i+1)&7] >> 7; + ek += i & 8; + i &= 7; + } +} + + +static void +invert_key( u16 *ek, u16 dk[IDEA_KEYLEN] ) +{ + int i; + u16 t1, t2, t3; + u16 temp[IDEA_KEYLEN]; + u16 *p = temp + IDEA_KEYLEN; + + t1 = mul_inv( *ek++ ); + t2 = -*ek++; + t3 = -*ek++; + *--p = mul_inv( *ek++ ); + *--p = t3; + *--p = t2; + *--p = t1; + + for(i=0; i < IDEA_ROUNDS-1; i++ ) { + t1 = *ek++; + *--p = *ek++; + *--p = t1; + + t1 = mul_inv( *ek++ ); + t2 = -*ek++; + t3 = -*ek++; + *--p = mul_inv( *ek++ ); + *--p = t2; + *--p = t3; + *--p = t1; + } + t1 = *ek++; + *--p = *ek++; + *--p = t1; + + t1 = mul_inv( *ek++ ); + t2 = -*ek++; + t3 = -*ek++; + *--p = mul_inv( *ek++ ); + *--p = t3; + *--p = t2; + *--p = t1; + memcpy(dk, temp, sizeof(temp) ); + memset(temp, 0, sizeof(temp) ); /* burn temp */ +} + + +static void +cipher( byte *outbuf, const byte *inbuf, u16 *key ) +{ + u16 s2, s3; + u16 in[4]; + int r = IDEA_ROUNDS; +#define x1 (in[0]) +#define x2 (in[1]) +#define x3 (in[2]) +#define x4 (in[3]) +#define MUL(x,y) \ + do {u16 _t16; u32 _t32; \ + if( (_t16 = (y)) ) { \ + if( (x = (x)&0xffff) ) { \ + _t32 = (u32)x * _t16; \ + x = _t32 & 0xffff; \ + _t16 = _t32 >> 16; \ + x = ((x)-_t16) + (x<_t16?1:0); \ + } \ + else { \ + x = 1 - _t16; \ + } \ + } \ + else { \ + x = 1 - x; \ + } \ + } while(0) + + memcpy (in, inbuf, sizeof in); +#ifndef WORDS_BIGENDIAN + x1 = (x1>>8) | (x1<<8); + x2 = (x2>>8) | (x2<<8); + x3 = (x3>>8) | (x3<<8); + x4 = (x4>>8) | (x4<<8); +#endif + do { + MUL(x1, *key++); + x2 += *key++; + x3 += *key++; + MUL(x4, *key++ ); + + s3 = x3; + x3 ^= x1; + MUL(x3, *key++); + s2 = x2; + x2 ^=x4; + x2 += x3; + MUL(x2, *key++); + x3 += x2; + + x1 ^= x2; + x4 ^= x3; + + x2 ^= s3; + x3 ^= s2; + } while( --r ); + MUL(x1, *key++); + x3 += *key++; + x2 += *key++; + MUL(x4, *key); + +#ifndef WORDS_BIGENDIAN + x1 = (x1>>8) | (x1<<8); + x2 = (x2>>8) | (x2<<8); + x3 = (x3>>8) | (x3<<8); + x4 = (x4>>8) | (x4<<8); +#endif + memcpy (outbuf+0, &x1, 2); + memcpy (outbuf+2, &x3, 2); + memcpy (outbuf+4, &x2, 2); + memcpy (outbuf+6, &x4, 2); +#undef MUL +#undef x1 +#undef x2 +#undef x3 +#undef x4 +} + + +static int +do_setkey( IDEA_context *c, const byte *key, unsigned int keylen ) +{ + static int initialized = 0; + static const char *selftest_failed = 0; + + if( !initialized ) { + initialized = 1; + selftest_failed = selftest(); + if( selftest_failed ) + log_error( "%s\n", selftest_failed ); + } + if( selftest_failed ) + return GPG_ERR_SELFTEST_FAILED; + + assert(keylen == 16); + c->have_dk = 0; + expand_key( key, c->ek ); + invert_key( c->ek, c->dk ); + return 0; +} + +static gcry_err_code_t +idea_setkey (void *context, const byte *key, unsigned int keylen) +{ + IDEA_context *ctx = context; + int rc = do_setkey (ctx, key, keylen); + _gcry_burn_stack (23+6*sizeof(void*)); + return rc; +} + +static void +encrypt_block( IDEA_context *c, byte *outbuf, const byte *inbuf ) +{ + cipher( outbuf, inbuf, c->ek ); +} + +static void +idea_encrypt (void *context, byte *out, const byte *in) +{ + IDEA_context *ctx = context; + encrypt_block (ctx, out, in); + _gcry_burn_stack (24+3*sizeof (void*)); +} + +static void +decrypt_block( IDEA_context *c, byte *outbuf, const byte *inbuf ) +{ + if( !c->have_dk ) { + c->have_dk = 1; + invert_key( c->ek, c->dk ); + } + cipher( outbuf, inbuf, c->dk ); +} + +static void +idea_decrypt (void *context, byte *out, const byte *in) +{ + IDEA_context *ctx = context; + decrypt_block (ctx, out, in); + _gcry_burn_stack (24+3*sizeof (void*)); +} + + + + +gcry_cipher_spec_t _gcry_cipher_spec_idea = +{ + "IDEA", NULL, NULL, IDEA_BLOCKSIZE, 128, + sizeof (IDEA_context), + idea_setkey, idea_encrypt, idea_decrypt + , +#ifdef GRUB_UTIL + .modname = "gcry_idea", +#endif +}; + + +GRUB_MOD_INIT(gcry_idea) +{ + grub_cipher_register (&_gcry_cipher_spec_idea); +} + +GRUB_MOD_FINI(gcry_idea) +{ + grub_cipher_unregister (&_gcry_cipher_spec_idea); +} |