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aes-decrypt.c

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    • Niels Möller's avatar
      c5c15385
      * Reordered includes in most or all .c-files. All should now include · c5c15385
      Niels Möller authored
      config.h.
      
      Rev: src/nettle/ChangeLog:1.195
      Rev: src/nettle/aes-decrypt-table.c:1.4
      Rev: src/nettle/aes-decrypt.c:1.5
      Rev: src/nettle/aes-encrypt-table.c:1.4
      Rev: src/nettle/aes-encrypt.c:1.5
      Rev: src/nettle/aes-meta.c:1.3
      Rev: src/nettle/aes-set-decrypt-key.c:1.2
      Rev: src/nettle/aes-set-encrypt-key.c:1.2
      Rev: src/nettle/aes.c:1.12
      Rev: src/nettle/aesdata.c:1.2
      Rev: src/nettle/arcfour-meta.c:1.2
      Rev: src/nettle/arcfour.c:1.3
      Rev: src/nettle/base16-decode.c:1.2
      Rev: src/nettle/base16-encode.c:1.2
      Rev: src/nettle/base16-meta.c:1.3
      Rev: src/nettle/base64-decode.c:1.5
      Rev: src/nettle/base64-encode.c:1.3
      Rev: src/nettle/base64-meta.c:1.4
      Rev: src/nettle/bignum-random.c:1.3
      Rev: src/nettle/bignum.c:1.7
      Rev: src/nettle/blowfish.c:1.4
      Rev: src/nettle/buffer-init.c:1.3
      Rev: src/nettle/buffer.c:1.8
      Rev: src/nettle/cast128-meta.c:1.3
      Rev: src/nettle/cast128.c:1.4
      Rev: src/nettle/cbc.c:1.6
      Rev: src/nettle/des-compat.c:1.10
      Rev: src/nettle/des.c:1.7
      Rev: src/nettle/des3.c:1.2
      Rev: src/nettle/dsa-keygen.c:1.6
      Rev: src/nettle/dsa-sign.c:1.7
      Rev: src/nettle/dsa-verify.c:1.4
      Rev: src/nettle/dsa.c:1.5
      Rev: src/nettle/examples/io.c:1.4
      Rev: src/nettle/examples/nettle-benchmark.c:1.8
      Rev: src/nettle/examples/nettle-openssl.c:1.2
      Rev: src/nettle/examples/rsa-keygen.c:1.10
      Rev: src/nettle/examples/rsa-sign.c:1.5
      Rev: src/nettle/examples/rsa-verify.c:1.4
      Rev: src/nettle/hmac-md5.c:1.5
      Rev: src/nettle/hmac-sha1.c:1.2
      Rev: src/nettle/hmac-sha256.c:1.2
      Rev: src/nettle/hmac.c:1.4
      Rev: src/nettle/knuth-lfib.c:1.2
      Rev: src/nettle/md5-compat.c:1.3
      Rev: src/nettle/md5-meta.c:1.2
      Rev: src/nettle/md5.c:1.6
      Rev: src/nettle/memxor.c:1.2
      Rev: src/nettle/nettle-internal.c:1.3
      Rev: src/nettle/pgp-encode.c:1.4
      Rev: src/nettle/pkcs1-rsa-md5.c:1.2
      Rev: src/nettle/pkcs1-rsa-sha1.c:1.2
      Rev: src/nettle/pkcs1.c:1.2
      Rev: src/nettle/realloc.c:1.3
      Rev: src/nettle/rsa-compat.c:1.8
      Rev: src/nettle/rsa-decrypt.c:1.4
      Rev: src/nettle/rsa-encrypt.c:1.5
      Rev: src/nettle/rsa-keygen.c:1.5
      Rev: src/nettle/rsa-md5-sign.c:1.2
      Rev: src/nettle/rsa-md5-verify.c:1.2
      Rev: src/nettle/rsa-sha1-sign.c:1.2
      Rev: src/nettle/rsa-sha1-verify.c:1.2
      Rev: src/nettle/rsa-sign.c:1.3
      Rev: src/nettle/rsa-verify.c:1.2
      Rev: src/nettle/rsa.c:1.12
      Rev: src/nettle/rsa2openpgp.c:1.2
      Rev: src/nettle/rsa2sexp.c:1.7
      Rev: src/nettle/serpent-meta.c:1.2
      Rev: src/nettle/serpent.c:1.4
      Rev: src/nettle/sexp-format.c:1.9
      Rev: src/nettle/sexp-transport-format.c:1.2
      Rev: src/nettle/sexp-transport.c:1.4
      Rev: src/nettle/sexp.c:1.14
      Rev: src/nettle/sexp2bignum.c:1.5
      Rev: src/nettle/sexp2dsa.c:1.4
      Rev: src/nettle/sexp2rsa.c:1.11
      Rev: src/nettle/sha1-meta.c:1.2
      Rev: src/nettle/sha1.c:1.8
      Rev: src/nettle/sha256-meta.c:1.2
      Rev: src/nettle/sha256.c:1.3
      Rev: src/nettle/tools/input.c:1.2
      Rev: src/nettle/tools/misc.c:1.2
      Rev: src/nettle/tools/output.c:1.3
      Rev: src/nettle/tools/parse.c:1.2
      Rev: src/nettle/tools/sexp-conv.c:1.14
      Rev: src/nettle/twofish-meta.c:1.2
      Rev: src/nettle/twofish.c:1.6
      Rev: src/nettle/yarrow256.c:1.17
      Rev: src/nettle/yarrow_key_event.c:1.4
      c5c15385
      History
      * Reordered includes in most or all .c-files. All should now include
      Niels Möller authored
      config.h.
      
      Rev: src/nettle/ChangeLog:1.195
      Rev: src/nettle/aes-decrypt-table.c:1.4
      Rev: src/nettle/aes-decrypt.c:1.5
      Rev: src/nettle/aes-encrypt-table.c:1.4
      Rev: src/nettle/aes-encrypt.c:1.5
      Rev: src/nettle/aes-meta.c:1.3
      Rev: src/nettle/aes-set-decrypt-key.c:1.2
      Rev: src/nettle/aes-set-encrypt-key.c:1.2
      Rev: src/nettle/aes.c:1.12
      Rev: src/nettle/aesdata.c:1.2
      Rev: src/nettle/arcfour-meta.c:1.2
      Rev: src/nettle/arcfour.c:1.3
      Rev: src/nettle/base16-decode.c:1.2
      Rev: src/nettle/base16-encode.c:1.2
      Rev: src/nettle/base16-meta.c:1.3
      Rev: src/nettle/base64-decode.c:1.5
      Rev: src/nettle/base64-encode.c:1.3
      Rev: src/nettle/base64-meta.c:1.4
      Rev: src/nettle/bignum-random.c:1.3
      Rev: src/nettle/bignum.c:1.7
      Rev: src/nettle/blowfish.c:1.4
      Rev: src/nettle/buffer-init.c:1.3
      Rev: src/nettle/buffer.c:1.8
      Rev: src/nettle/cast128-meta.c:1.3
      Rev: src/nettle/cast128.c:1.4
      Rev: src/nettle/cbc.c:1.6
      Rev: src/nettle/des-compat.c:1.10
      Rev: src/nettle/des.c:1.7
      Rev: src/nettle/des3.c:1.2
      Rev: src/nettle/dsa-keygen.c:1.6
      Rev: src/nettle/dsa-sign.c:1.7
      Rev: src/nettle/dsa-verify.c:1.4
      Rev: src/nettle/dsa.c:1.5
      Rev: src/nettle/examples/io.c:1.4
      Rev: src/nettle/examples/nettle-benchmark.c:1.8
      Rev: src/nettle/examples/nettle-openssl.c:1.2
      Rev: src/nettle/examples/rsa-keygen.c:1.10
      Rev: src/nettle/examples/rsa-sign.c:1.5
      Rev: src/nettle/examples/rsa-verify.c:1.4
      Rev: src/nettle/hmac-md5.c:1.5
      Rev: src/nettle/hmac-sha1.c:1.2
      Rev: src/nettle/hmac-sha256.c:1.2
      Rev: src/nettle/hmac.c:1.4
      Rev: src/nettle/knuth-lfib.c:1.2
      Rev: src/nettle/md5-compat.c:1.3
      Rev: src/nettle/md5-meta.c:1.2
      Rev: src/nettle/md5.c:1.6
      Rev: src/nettle/memxor.c:1.2
      Rev: src/nettle/nettle-internal.c:1.3
      Rev: src/nettle/pgp-encode.c:1.4
      Rev: src/nettle/pkcs1-rsa-md5.c:1.2
      Rev: src/nettle/pkcs1-rsa-sha1.c:1.2
      Rev: src/nettle/pkcs1.c:1.2
      Rev: src/nettle/realloc.c:1.3
      Rev: src/nettle/rsa-compat.c:1.8
      Rev: src/nettle/rsa-decrypt.c:1.4
      Rev: src/nettle/rsa-encrypt.c:1.5
      Rev: src/nettle/rsa-keygen.c:1.5
      Rev: src/nettle/rsa-md5-sign.c:1.2
      Rev: src/nettle/rsa-md5-verify.c:1.2
      Rev: src/nettle/rsa-sha1-sign.c:1.2
      Rev: src/nettle/rsa-sha1-verify.c:1.2
      Rev: src/nettle/rsa-sign.c:1.3
      Rev: src/nettle/rsa-verify.c:1.2
      Rev: src/nettle/rsa.c:1.12
      Rev: src/nettle/rsa2openpgp.c:1.2
      Rev: src/nettle/rsa2sexp.c:1.7
      Rev: src/nettle/serpent-meta.c:1.2
      Rev: src/nettle/serpent.c:1.4
      Rev: src/nettle/sexp-format.c:1.9
      Rev: src/nettle/sexp-transport-format.c:1.2
      Rev: src/nettle/sexp-transport.c:1.4
      Rev: src/nettle/sexp.c:1.14
      Rev: src/nettle/sexp2bignum.c:1.5
      Rev: src/nettle/sexp2dsa.c:1.4
      Rev: src/nettle/sexp2rsa.c:1.11
      Rev: src/nettle/sha1-meta.c:1.2
      Rev: src/nettle/sha1.c:1.8
      Rev: src/nettle/sha256-meta.c:1.2
      Rev: src/nettle/sha256.c:1.3
      Rev: src/nettle/tools/input.c:1.2
      Rev: src/nettle/tools/misc.c:1.2
      Rev: src/nettle/tools/output.c:1.3
      Rev: src/nettle/tools/parse.c:1.2
      Rev: src/nettle/tools/sexp-conv.c:1.14
      Rev: src/nettle/twofish-meta.c:1.2
      Rev: src/nettle/twofish.c:1.6
      Rev: src/nettle/yarrow256.c:1.17
      Rev: src/nettle/yarrow_key_event.c:1.4
    des3.c 2.04 KiB
    /* des3.h
     *
     * Triple DES cipher. Three key encrypt-decrypt-encrypt.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2001 Niels Mller
     *  
     * The nettle library is free software; you can redistribute it and/or modify
     * it under the terms of the GNU Lesser General Public License as published by
     * the Free Software Foundation; either version 2.1 of the License, or (at your
     * option) any later version.
     * 
     * The nettle library is distributed in the hope that it will be useful, but
     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
     * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
     * License for more details.
     * 
     * You should have received a copy of the GNU Lesser General Public License
     * along with the nettle library; see the file COPYING.LIB.  If not, write to
     * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
     * MA 02111-1307, USA.
     */
    
    #include "des.h"
    
    /* It's possible to make some more general pipe construction, like the
     * lsh/src/cascade.c, but as in practice it's never used for anything
     * like triple DES, it's not worth the effort. */
    
    /* On success, returns 1 and sets ctx->status to DES_OK (zero). On
     * error, returns 0 and sets ctx->status accordingly. */
    int
    des3_set_key(struct des3_ctx *ctx, const uint8_t *key)
    {
      unsigned i;
      for (i = 0; i<3; i++, key += DES_KEY_SIZE)
        if (!des_set_key(&ctx->des[i], key))
          {
    	ctx->status = ctx->des[i].status;
    	return 0;
          }
      ctx->status = DES_OK;
      return 1;
    }
    
    void
    des3_encrypt(struct des3_ctx *ctx,
    	     unsigned length, uint8_t *dst,
    	     const uint8_t *src)
    {
      des_encrypt(&ctx->des[0],
    	      length, dst, src);
      des_decrypt(&ctx->des[1],
    	      length, dst, dst);
      des_encrypt(&ctx->des[2],
    	      length, dst, dst);
    }
    
    void
    des3_decrypt(struct des3_ctx *ctx,
    	    unsigned length, uint8_t *dst,
    	    const uint8_t *src)
    {
      des_decrypt(&ctx->des[2],
    	      length, dst, src);
      des_encrypt(&ctx->des[1],
    	      length, dst, dst);
      des_decrypt(&ctx->des[0],
    	      length, dst, dst);
    }