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 */
34 int
ecb_cipher_contiguous_blocks(ecb_ctx_t * ctx,char * data,size_t length,crypto_data_t * out,size_t block_size,int (* cipher)(const void * ks,const uint8_t * pt,uint8_t * ct))35 ecb_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
113 out:
114 return (CRYPTO_SUCCESS);
115 }
116
117 void *
ecb_alloc_ctx(int kmflag)118 ecb_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