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105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
/******************************************************
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Copyright (c) 2013 Percona LLC and/or its affiliates.
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The xbcrypt format writer implementation.
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This program 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; version 2 of the License.
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This program 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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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*******************************************************/
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#include "xbcrypt.h"
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#include "crc_glue.h"
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struct xb_wcrypt_struct {
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void *userdata;
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xb_crypt_write_callback *write;
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};
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xb_wcrypt_t *
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xb_crypt_write_open(void *userdata, xb_crypt_write_callback *onwrite)
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{
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xb_wcrypt_t *crypt;
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xb_ad(onwrite);
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crypt = (xb_wcrypt_t *) my_malloc(sizeof(xb_wcrypt_t), MYF(MY_FAE));
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crypt->userdata = userdata;
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crypt->write = onwrite;
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return crypt;
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}
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int xb_crypt_write_chunk(xb_wcrypt_t *crypt, const void *buf, size_t olen,
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size_t elen, const void *iv, size_t ivlen)
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{
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uchar tmpbuf[XB_CRYPT_CHUNK_MAGIC_SIZE + 8 + 8 + 8 + 4 + 8];
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uchar *ptr;
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ulong checksum;
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xb_ad(olen <= INT_MAX);
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if (olen > INT_MAX)
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return 0;
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xb_ad(elen <= INT_MAX);
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if (elen > INT_MAX)
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return 0;
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xb_ad(ivlen <= INT_MAX);
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if (ivlen > INT_MAX)
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return 0;
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ptr = tmpbuf;
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memcpy(ptr, XB_CRYPT_CHUNK_MAGIC_CURRENT, XB_CRYPT_CHUNK_MAGIC_SIZE);
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ptr += XB_CRYPT_CHUNK_MAGIC_SIZE;
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int8store(ptr, (ulonglong)0); /* reserved */
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ptr += 8;
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int8store(ptr, (ulonglong)olen); /* original size */
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ptr += 8;
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int8store(ptr, (ulonglong)elen); /* encrypted (actual) size */
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ptr += 8;
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checksum = crc32_iso3309(0, buf, elen);
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int4store(ptr, checksum); /* checksum */
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ptr += 4;
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int8store(ptr, (ulonglong)ivlen); /* iv size */
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ptr += 8;
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xb_ad(ptr <= tmpbuf + sizeof(tmpbuf));
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if (crypt->write(crypt->userdata, tmpbuf, ptr-tmpbuf) == -1)
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return 1;
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if (crypt->write(crypt->userdata, iv, ivlen) == -1)
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return 1;
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if (crypt->write(crypt->userdata, buf, elen) == -1)
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return 1;
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return 0;
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}
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int xb_crypt_write_close(xb_wcrypt_t *crypt)
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{
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my_free(crypt);
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return 0;
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}
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