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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | // SPDX-License-Identifier: GPL-2.0+ #include <config.h> #include <dm.h> #include <log.h> #include <malloc.h> #include <uboot_aes.h> #define SW_KEY_SLOTS 2 struct sw_aes_priv { u8 key_slots[SW_KEY_SLOTS][AES256_KEY_LENGTH]; u8 key_schedule[AES256_EXPAND_KEY_LENGTH]; u8 selected_slot; u32 selected_key_size; bool key_expanded; }; static int prepare_aes(struct sw_aes_priv *priv) { if (!priv->selected_key_size) { log_debug("%s: AES key size not set, setup a slot first\n", __func__); return 1; } if (priv->key_expanded) return 0; priv->key_expanded = 1; aes_expand_key(priv->key_slots[priv->selected_slot], priv->selected_key_size, priv->key_schedule); return 0; } static int sw_aes_ops_available_key_slots(struct udevice *dev) { return SW_KEY_SLOTS; } static int sw_aes_ops_select_key_slot(struct udevice *dev, u32 key_size, u8 slot) { struct sw_aes_priv *priv = dev_get_priv(dev); if (slot >= SW_KEY_SLOTS) return 1; priv->selected_slot = slot; priv->selected_key_size = key_size; priv->key_expanded = 0; return 0; } static int sw_aes_ops_set_key_for_key_slot(struct udevice *dev, u32 key_size, u8 *key, u8 slot) { struct sw_aes_priv *priv = dev_get_priv(dev); if (slot >= SW_KEY_SLOTS) return 1; memcpy(priv->key_slots[slot], key, key_size / 8); if (priv->selected_slot == slot) priv->selected_key_size = key_size; priv->key_expanded = 0; return 0; } static int sw_aes_ops_aes_ecb_encrypt(struct udevice *dev, u8 *src, u8 *dst, u32 num_aes_blocks) { struct sw_aes_priv *priv = dev_get_priv(dev); int ret; ret = prepare_aes(priv); if (ret) return ret; while (num_aes_blocks > 0) { aes_encrypt(priv->selected_key_size, src, priv->key_schedule, dst); num_aes_blocks -= 1; src += AES_BLOCK_LENGTH; dst += AES_BLOCK_LENGTH; } return 0; } static int sw_aes_ops_aes_ecb_decrypt(struct udevice *dev, u8 *src, u8 *dst, u32 num_aes_blocks) { struct sw_aes_priv *priv = dev_get_priv(dev); int ret; ret = prepare_aes(priv); if (ret) return ret; while (num_aes_blocks > 0) { aes_decrypt(priv->selected_key_size, src, priv->key_schedule, dst); num_aes_blocks -= 1; src += AES_BLOCK_LENGTH; dst += AES_BLOCK_LENGTH; } return 0; } static int sw_aes_ops_aes_cbc_encrypt(struct udevice *dev, u8 *iv, u8 *src, u8 *dst, u32 num_aes_blocks) { struct sw_aes_priv *priv = dev_get_priv(dev); int ret; ret = prepare_aes(priv); if (ret) return ret; aes_cbc_encrypt_blocks(priv->selected_key_size, priv->key_schedule, iv, src, dst, num_aes_blocks); return 0; } static int sw_aes_ops_aes_cbc_decrypt(struct udevice *dev, u8 *iv, u8 *src, u8 *dst, u32 num_aes_blocks) { struct sw_aes_priv *priv = dev_get_priv(dev); int ret; ret = prepare_aes(priv); if (ret) return ret; aes_cbc_decrypt_blocks(priv->selected_key_size, priv->key_schedule, iv, src, dst, num_aes_blocks); return 0; } static const struct aes_ops aes_ops_sw = { .available_key_slots = sw_aes_ops_available_key_slots, .select_key_slot = sw_aes_ops_select_key_slot, .set_key_for_key_slot = sw_aes_ops_set_key_for_key_slot, .aes_ecb_encrypt = sw_aes_ops_aes_ecb_encrypt, .aes_ecb_decrypt = sw_aes_ops_aes_ecb_decrypt, .aes_cbc_encrypt = sw_aes_ops_aes_cbc_encrypt, .aes_cbc_decrypt = sw_aes_ops_aes_cbc_decrypt, }; static const struct udevice_id sw_aes_ids[] = { { .compatible = "software-aes-engine" }, { } }; U_BOOT_DRIVER(aes_sw) = { .name = "aes_sw", .id = UCLASS_AES, .of_match = sw_aes_ids, .ops = &aes_ops_sw, .priv_auto = sizeof(struct sw_aes_priv), }; |