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280 lines
7.5 KiB
C
280 lines
7.5 KiB
C
/* Rijndael (AES) for GnuPG
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* Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*******************************************************************
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A version of rijndael.c modified by Brian Gladman to use his AES code
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*/
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#include <stdlib.h>
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#include <string.h> /* for memcmp() */
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#include "util.h"
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#include "aes.h"
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typedef struct
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{ aes_encrypt_ctx ectx[1];
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aes_decrypt_ctx dctx[1];
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unsigned int klen;
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unsigned int dkey;
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} RIJNDAEL_context;
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static const char *selftest(void);
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static int tested = 0;
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static void
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burn_stack (int bytes)
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{
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char buf[64];
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wipememory(buf,sizeof buf);
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bytes -= sizeof buf;
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if (bytes > 0)
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burn_stack (bytes);
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}
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static int
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rijndael_setkey (RIJNDAEL_context *ctx, const byte *key, const unsigned keylen)
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{ int rc;
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if(!tested)
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{ const char *tr;
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tested = 1;
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tr = selftest();
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if(tr)
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{
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fprintf(stderr, "%s\n", tr );
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return G10ERR_SELFTEST_FAILED;
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}
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}
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ctx->klen = keylen;
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ctx->dkey = 0;
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rc = 0;
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if(keylen == 16 || keylen == 24 || keylen == 32)
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aes_encrypt_key(key, keylen, ctx->ectx);
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else
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rc = 1;
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burn_stack ( 100 + 16*sizeof(int));
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return rc;
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}
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static void
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rijndael_encrypt (const RIJNDAEL_context *ctx, byte *b, const byte *a)
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{
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aes_encrypt(a, b, ctx->ectx);
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burn_stack (16 + 2*sizeof(int));
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}
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static void
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rijndael_decrypt (RIJNDAEL_context *ctx, byte *b, const byte *a)
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{
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if(!(ctx->dkey))
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{
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aes_decrypt_key((byte*)ctx->ectx, ctx->klen, ctx->dctx);
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ctx->dkey = 1;
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}
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aes_decrypt(a, b, ctx->dctx);
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burn_stack (16+2*sizeof(int));
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}
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/* Test a single encryption and decryption with each key size. */
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static const char*
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selftest (void)
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{
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RIJNDAEL_context ctx;
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byte scratch[16];
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/* The test vectors are from the AES supplied ones; more or less
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* randomly taken from ecb_tbl.txt (I=42,81,14)
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*/
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static const byte plaintext[16] = {
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0x01,0x4B,0xAF,0x22,0x78,0xA6,0x9D,0x33,
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0x1D,0x51,0x80,0x10,0x36,0x43,0xE9,0x9A
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};
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static const byte key[16] = {
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0xE8,0xE9,0xEA,0xEB,0xED,0xEE,0xEF,0xF0,
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0xF2,0xF3,0xF4,0xF5,0xF7,0xF8,0xF9,0xFA
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};
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static const byte ciphertext[16] = {
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0x67,0x43,0xC3,0xD1,0x51,0x9A,0xB4,0xF2,
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0xCD,0x9A,0x78,0xAB,0x09,0xA5,0x11,0xBD
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};
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static const byte plaintext_192[16] = {
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0x76,0x77,0x74,0x75,0xF1,0xF2,0xF3,0xF4,
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0xF8,0xF9,0xE6,0xE7,0x77,0x70,0x71,0x72
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};
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static const byte key_192[24] = {
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0x04,0x05,0x06,0x07,0x09,0x0A,0x0B,0x0C,
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0x0E,0x0F,0x10,0x11,0x13,0x14,0x15,0x16,
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0x18,0x19,0x1A,0x1B,0x1D,0x1E,0x1F,0x20
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};
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static const byte ciphertext_192[16] = {
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0x5D,0x1E,0xF2,0x0D,0xCE,0xD6,0xBC,0xBC,
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0x12,0x13,0x1A,0xC7,0xC5,0x47,0x88,0xAA
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};
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static const byte plaintext_256[16] = {
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0x06,0x9A,0x00,0x7F,0xC7,0x6A,0x45,0x9F,
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0x98,0xBA,0xF9,0x17,0xFE,0xDF,0x95,0x21
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};
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static const byte key_256[32] = {
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0x08,0x09,0x0A,0x0B,0x0D,0x0E,0x0F,0x10,
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0x12,0x13,0x14,0x15,0x17,0x18,0x19,0x1A,
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0x1C,0x1D,0x1E,0x1F,0x21,0x22,0x23,0x24,
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0x26,0x27,0x28,0x29,0x2B,0x2C,0x2D,0x2E
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};
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static const byte ciphertext_256[16] = {
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0x08,0x0E,0x95,0x17,0xEB,0x16,0x77,0x71,
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0x9A,0xCF,0x72,0x80,0x86,0x04,0x0A,0xE3
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};
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rijndael_setkey (&ctx, key, sizeof(key));
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rijndael_encrypt (&ctx, scratch, plaintext);
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if (memcmp (scratch, ciphertext, sizeof (ciphertext)))
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return "Rijndael-128 test encryption failed.";
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rijndael_decrypt (&ctx, scratch, scratch);
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if (memcmp (scratch, plaintext, sizeof (plaintext)))
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return "Rijndael-128 test decryption failed.";
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rijndael_setkey (&ctx, key_192, sizeof(key_192));
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rijndael_encrypt (&ctx, scratch, plaintext_192);
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if (memcmp (scratch, ciphertext_192, sizeof (ciphertext_192)))
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return "Rijndael-192 test encryption failed.";
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rijndael_decrypt (&ctx, scratch, scratch);
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if (memcmp (scratch, plaintext_192, sizeof (plaintext_192)))
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return "Rijndael-192 test decryption failed.";
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rijndael_setkey (&ctx, key_256, sizeof(key_256));
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rijndael_encrypt (&ctx, scratch, plaintext_256);
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if (memcmp (scratch, ciphertext_256, sizeof (ciphertext_256)))
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return "Rijndael-256 test encryption failed.";
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rijndael_decrypt (&ctx, scratch, scratch);
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if (memcmp (scratch, plaintext_256, sizeof (plaintext_256)))
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return "Rijndael-256 test decryption failed.";
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return NULL;
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}
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#ifdef IS_MODULE
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static
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#endif
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const char *
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rijndael_get_info (int algo, size_t *keylen,
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size_t *blocksize, size_t *contextsize,
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int (**r_setkey) (void *c, byte *key, unsigned keylen),
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void (**r_encrypt) (void *c, byte *outbuf, byte *inbuf),
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void (**r_decrypt) (void *c, byte *outbuf, byte *inbuf)
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)
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{
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*keylen = algo==7? 128 : algo==8? 192 : 256;
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*blocksize = 16;
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*contextsize = sizeof (RIJNDAEL_context);
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*(int (**)(RIJNDAEL_context*, const byte*, const unsigned))r_setkey
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= rijndael_setkey;
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*(void (**)(const RIJNDAEL_context*, byte*, const byte*))r_encrypt
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= rijndael_encrypt;
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*(void (**)(RIJNDAEL_context*, byte*, const byte*))r_decrypt
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= rijndael_decrypt;
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if( algo == 7 )
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return "AES";
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if (algo == 8)
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return "AES192";
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if (algo == 9)
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return "AES256";
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return NULL;
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}
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#ifdef IS_MODULE
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static
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const char * const gnupgext_version = "RIJNDAEL ($Revision$)";
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static struct {
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int class;
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int version;
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int value;
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void (*func)(void);
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} func_table[] = {
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{ 20, 1, 0, (void*)rijndael_get_info },
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{ 21, 1, 7 },
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{ 21, 1, 8 },
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{ 21, 1, 9 },
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};
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/****************
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* Enumerate the names of the functions together with information about
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* this function. Set sequence to an integer with a initial value of 0 and
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* do not change it.
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* If what is 0 all kind of functions are returned.
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* Return values: class := class of function:
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* 10 = message digest algorithm info function
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* 11 = integer with available md algorithms
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* 20 = cipher algorithm info function
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* 21 = integer with available cipher algorithms
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* 30 = public key algorithm info function
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* 31 = integer with available pubkey algorithms
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* version = interface version of the function/pointer
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* (currently this is 1 for all functions)
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*/
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static
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void *
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gnupgext_enum_func ( int what, int *sequence, int *class, int *vers )
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{
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void *ret;
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int i = *sequence;
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do {
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if ( i >= DIM(func_table) || i < 0 ) {
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return NULL;
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}
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*class = func_table[i].class;
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*vers = func_table[i].version;
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switch( *class ) {
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case 11:
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case 21:
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case 31:
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ret = &func_table[i].value;
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break;
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default:
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ret = func_table[i].func;
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break;
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}
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i++;
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} while ( what && what != *class );
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*sequence = i;
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return ret;
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}
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#endif
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