1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#include <sys/zfs_context.h>
27#include <modes/modes.h>
28#include <sys/crypto/common.h>
29#include <sys/crypto/impl.h>
30
31/*
32 * Algorithm independent ECB functions.
33 */
34int
35ecb_cipher_contiguous_blocks(ecb_ctx_t *ctx, char *data, size_t length,
36    crypto_data_t *out, size_t block_size,
37    int (*cipher)(const void *ks, const uint8_t *pt, uint8_t *ct))
38{
39	size_t remainder = length;
40	size_t need = 0;
41	uint8_t *datap = (uint8_t *)data;
42	uint8_t *blockp;
43	uint8_t *lastp;
44	void *iov_or_mp;
45	offset_t offset;
46	uint8_t *out_data_1;
47	uint8_t *out_data_2;
48	size_t out_data_1_len;
49
50	if (length + ctx->ecb_remainder_len < block_size) {
51		/* accumulate bytes here and return */
52		memcpy((uint8_t *)ctx->ecb_remainder + ctx->ecb_remainder_len,
53		    datap,
54		    length);
55		ctx->ecb_remainder_len += length;
56		ctx->ecb_copy_to = datap;
57		return (CRYPTO_SUCCESS);
58	}
59
60	lastp = (uint8_t *)ctx->ecb_iv;
61	crypto_init_ptrs(out, &iov_or_mp, &offset);
62
63	do {
64		/* Unprocessed data from last call. */
65		if (ctx->ecb_remainder_len > 0) {
66			need = block_size - ctx->ecb_remainder_len;
67
68			if (need > remainder)
69				return (CRYPTO_DATA_LEN_RANGE);
70
71			memcpy(&((uint8_t *)ctx->ecb_remainder)
72			    [ctx->ecb_remainder_len], datap, need);
73
74			blockp = (uint8_t *)ctx->ecb_remainder;
75		} else {
76			blockp = datap;
77		}
78
79		cipher(ctx->ecb_keysched, blockp, lastp);
80		crypto_get_ptrs(out, &iov_or_mp, &offset, &out_data_1,
81		    &out_data_1_len, &out_data_2, block_size);
82
83		/* copy block to where it belongs */
84		memcpy(out_data_1, lastp, out_data_1_len);
85		if (out_data_2 != NULL) {
86			memcpy(out_data_2, lastp + out_data_1_len,
87			    block_size - out_data_1_len);
88		}
89		/* update offset */
90		out->cd_offset += block_size;
91
92		/* Update pointer to next block of data to be processed. */
93		if (ctx->ecb_remainder_len != 0) {
94			datap += need;
95			ctx->ecb_remainder_len = 0;
96		} else {
97			datap += block_size;
98		}
99
100		remainder = (size_t)&data[length] - (size_t)datap;
101
102		/* Incomplete last block. */
103		if (remainder > 0 && remainder < block_size) {
104			memcpy(ctx->ecb_remainder, datap, remainder);
105			ctx->ecb_remainder_len = remainder;
106			ctx->ecb_copy_to = datap;
107			goto out;
108		}
109		ctx->ecb_copy_to = NULL;
110
111	} while (remainder > 0);
112
113out:
114	return (CRYPTO_SUCCESS);
115}
116
117void *
118ecb_alloc_ctx(int kmflag)
119{
120	ecb_ctx_t *ecb_ctx;
121
122	if ((ecb_ctx = kmem_zalloc(sizeof (ecb_ctx_t), kmflag)) == NULL)
123		return (NULL);
124
125	ecb_ctx->ecb_flags = ECB_MODE;
126	return (ecb_ctx);
127}
128