3312af6e07
We currently use an old version of libgcrypt which results in us having fewer ciphers and missing on many other improvements. Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
120 lines
4.0 KiB
C
120 lines
4.0 KiB
C
/* Rijndael (AES) for GnuPG - PowerPC Vector Crypto AES implementation
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* Copyright 2021- IBM Inc. All rights reserved
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*
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* This file is part of Libgcrypt.
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*
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* Libgcrypt is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* Libgcrypt 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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* Alternatively, this code may be used in OpenSSL from The OpenSSL Project,
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* and Cryptogams by Andy Polyakov, and if made part of a release of either
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* or both projects, is thereafter dual-licensed under the license said project
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* is released under.
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*/
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#include <config.h>
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#include "rijndael-internal.h"
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#include "cipher-internal.h"
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#include "bufhelp.h"
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#ifdef USE_PPC_CRYPTO_WITH_PPC9LE
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extern size_t _gcry_ppc10_aes_gcm_encrypt (const void *inp, void *out,
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size_t len,
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const unsigned char *key,
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unsigned char iv[16], void *Xip);
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extern size_t _gcry_ppc10_aes_gcm_decrypt (const void *inp, void *out,
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size_t len,
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const unsigned char *key,
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unsigned char iv[16], void *Xip);
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size_t
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_gcry_aes_p10le_gcm_crypt(gcry_cipher_hd_t c, void *outbuf_arg,
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const void *inbuf_arg, size_t nblocks, int encrypt)
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{
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RIJNDAEL_context *ctx = (RIJNDAEL_context *) &c->context.c;
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unsigned char *rk = (unsigned char *) ctx->u1.keyschedule;
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unsigned char *gcm_table = (unsigned char *) c->u_mode.gcm.gcm_table;
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unsigned char *iv = c->u_ctr.ctr;
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unsigned char *Xi = c->u_mode.gcm.u_tag.tag;
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int s = 0;
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int ndone = 0;
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int ctr_reset = 0;
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size_t len = nblocks * GCRY_GCM_BLOCK_LEN;
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u64 blocks_unused;
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u64 nb = nblocks;
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u64 next_ctr = 0;
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unsigned char ctr_saved[12];
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unsigned char *inp = (unsigned char *) inbuf_arg;
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unsigned char *out = (unsigned char *) outbuf_arg;
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/*
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* This is what the aes-gcm asembly code expects some input parameters.
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*
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* - Number of rounds is at 480 offset from rk (rk->rounds)
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* - Xi at 256 offset from gcm_table
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*/
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gcry_assert (sizeof(c->u_mode.gcm.gcm_table) >= 256 + 16);
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buf_cpy (gcm_table+256, Xi, 16);
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buf_cpy (ctr_saved, c->u_ctr.ctr, 12);
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while (nb)
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{
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blocks_unused = (u64) 0xffffffffU + 1 - (u64) buf_get_be32 (iv + 12);
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if (nb > blocks_unused)
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{
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len = blocks_unused * GCRY_GCM_BLOCK_LEN;
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nb -= blocks_unused;
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next_ctr = blocks_unused;
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ctr_reset = 1;
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}
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else
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{
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len = nb * GCRY_GCM_BLOCK_LEN;
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next_ctr = nb;
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nb = 0;
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}
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if (encrypt)
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s = _gcry_ppc10_aes_gcm_encrypt((const void *) inp, (void *) out, len,
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(const unsigned char *) rk, iv,
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(void *) gcm_table);
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else
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s = _gcry_ppc10_aes_gcm_decrypt((const void *) inp, (void *) out, len,
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(const unsigned char *) rk, iv,
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(void *) gcm_table);
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cipher_block_add(c->u_ctr.ctr, next_ctr, GCRY_GCM_BLOCK_LEN);
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if (ctr_reset)
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{
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ctr_reset = 0;
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inp += len;
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out += len;
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}
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buf_cpy (c->u_ctr.ctr, ctr_saved, 12);
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ndone += s;
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}
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buf_cpy (Xi, gcm_table+256, 16);
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/*
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* Return number of blocks done.
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*/
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s = ndone / GCRY_GCM_BLOCK_LEN;
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s = nblocks - s;
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return ( s );
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}
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#endif /* USE_PPC_CRYPTO_WITH_PPC9LE */
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