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 2009 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 * Initialize by setting iov_or_mp to point to the current iovec or mp, 33 * and by setting current_offset to an offset within the current iovec or mp. 34 */ 35 void 36 crypto_init_ptrs(crypto_data_t *out, void **iov_or_mp, offset_t *current_offset) 37 { 38 offset_t offset; 39 40 switch (out->cd_format) { 41 case CRYPTO_DATA_RAW: 42 *current_offset = out->cd_offset; 43 break; 44 45 case CRYPTO_DATA_UIO: { 46 zfs_uio_t *uiop = out->cd_uio; 47 uint_t vec_idx; 48 49 offset = out->cd_offset; 50 offset = zfs_uio_index_at_offset(uiop, offset, &vec_idx); 51 52 *current_offset = offset; 53 *iov_or_mp = (void *)(uintptr_t)vec_idx; 54 break; 55 } 56 } /* end switch */ 57 } 58 59 /* 60 * Get pointers for where in the output to copy a block of encrypted or 61 * decrypted data. The iov_or_mp argument stores a pointer to the current 62 * iovec or mp, and offset stores an offset into the current iovec or mp. 63 */ 64 void 65 crypto_get_ptrs(crypto_data_t *out, void **iov_or_mp, offset_t *current_offset, 66 uint8_t **out_data_1, size_t *out_data_1_len, uint8_t **out_data_2, 67 size_t amt) 68 { 69 offset_t offset; 70 71 switch (out->cd_format) { 72 case CRYPTO_DATA_RAW: { 73 iovec_t *iov; 74 75 offset = *current_offset; 76 iov = &out->cd_raw; 77 if ((offset + amt) <= iov->iov_len) { 78 /* one block fits */ 79 *out_data_1 = (uint8_t *)iov->iov_base + offset; 80 *out_data_1_len = amt; 81 *out_data_2 = NULL; 82 *current_offset = offset + amt; 83 } 84 break; 85 } 86 87 case CRYPTO_DATA_UIO: { 88 zfs_uio_t *uio = out->cd_uio; 89 offset_t offset; 90 uint_t vec_idx; 91 uint8_t *p; 92 uint64_t iov_len; 93 void *iov_base; 94 95 offset = *current_offset; 96 vec_idx = (uintptr_t)(*iov_or_mp); 97 zfs_uio_iov_at_index(uio, vec_idx, &iov_base, &iov_len); 98 p = (uint8_t *)iov_base + offset; 99 *out_data_1 = p; 100 101 if (offset + amt <= iov_len) { 102 /* can fit one block into this iov */ 103 *out_data_1_len = amt; 104 *out_data_2 = NULL; 105 *current_offset = offset + amt; 106 } else { 107 /* one block spans two iovecs */ 108 *out_data_1_len = iov_len - offset; 109 if (vec_idx == zfs_uio_iovcnt(uio)) 110 return; 111 vec_idx++; 112 zfs_uio_iov_at_index(uio, vec_idx, &iov_base, &iov_len); 113 *out_data_2 = (uint8_t *)iov_base; 114 *current_offset = amt - *out_data_1_len; 115 } 116 *iov_or_mp = (void *)(uintptr_t)vec_idx; 117 break; 118 } 119 } /* end switch */ 120 } 121 122 void 123 crypto_free_mode_ctx(void *ctx) 124 { 125 common_ctx_t *common_ctx = (common_ctx_t *)ctx; 126 127 switch (common_ctx->cc_flags & 128 (ECB_MODE|CBC_MODE|CTR_MODE|CCM_MODE|GCM_MODE|GMAC_MODE)) { 129 case ECB_MODE: 130 kmem_free(common_ctx, sizeof (ecb_ctx_t)); 131 break; 132 133 case CBC_MODE: 134 kmem_free(common_ctx, sizeof (cbc_ctx_t)); 135 break; 136 137 case CTR_MODE: 138 kmem_free(common_ctx, sizeof (ctr_ctx_t)); 139 break; 140 141 case CCM_MODE: 142 if (((ccm_ctx_t *)ctx)->ccm_pt_buf != NULL) 143 vmem_free(((ccm_ctx_t *)ctx)->ccm_pt_buf, 144 ((ccm_ctx_t *)ctx)->ccm_data_len); 145 146 kmem_free(ctx, sizeof (ccm_ctx_t)); 147 break; 148 149 case GCM_MODE: 150 case GMAC_MODE: 151 if (((gcm_ctx_t *)ctx)->gcm_pt_buf != NULL) 152 vmem_free(((gcm_ctx_t *)ctx)->gcm_pt_buf, 153 ((gcm_ctx_t *)ctx)->gcm_pt_buf_len); 154 155 #ifdef CAN_USE_GCM_ASM 156 if (((gcm_ctx_t *)ctx)->gcm_Htable != NULL) { 157 gcm_ctx_t *gcm_ctx = (gcm_ctx_t *)ctx; 158 memset(gcm_ctx->gcm_Htable, 0, gcm_ctx->gcm_htab_len); 159 kmem_free(gcm_ctx->gcm_Htable, gcm_ctx->gcm_htab_len); 160 } 161 #endif 162 163 kmem_free(ctx, sizeof (gcm_ctx_t)); 164 } 165 } 166