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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | // SPDX-License-Identifier: GPL-2.0+ #define LOG_CATEGORY UCLASS_AES #include <dm.h> #include <malloc.h> #include <log.h> #include <uboot_aes.h> #include <linux/string.h> int dm_aes_get_available_key_slots(struct udevice *dev) { const struct aes_ops *ops; if (!dev) return -ENODEV; ops = aes_get_ops(dev); if (!ops->available_key_slots) return -ENOSYS; return ops->available_key_slots(dev); } int dm_aes_select_key_slot(struct udevice *dev, u32 key_size, u8 slot) { const struct aes_ops *ops; if (!dev) return -ENODEV; ops = aes_get_ops(dev); if (!ops->select_key_slot) return -ENOSYS; return ops->select_key_slot(dev, key_size, slot); } int dm_aes_set_key_for_key_slot(struct udevice *dev, u32 key_size, u8 *key, u8 slot) { const struct aes_ops *ops; if (!dev) return -ENODEV; ops = aes_get_ops(dev); if (!ops->set_key_for_key_slot) return -ENOSYS; return ops->set_key_for_key_slot(dev, key_size, key, slot); } int dm_aes_ecb_encrypt(struct udevice *dev, u8 *src, u8 *dst, u32 num_aes_blocks) { const struct aes_ops *ops; if (!dev) return -ENODEV; ops = aes_get_ops(dev); if (!ops->aes_ecb_encrypt) return -ENOSYS; return ops->aes_ecb_encrypt(dev, src, dst, num_aes_blocks); } int dm_aes_ecb_decrypt(struct udevice *dev, u8 *src, u8 *dst, u32 num_aes_blocks) { const struct aes_ops *ops; if (!dev) return -ENODEV; ops = aes_get_ops(dev); if (!ops->aes_ecb_decrypt) return -ENOSYS; return ops->aes_ecb_decrypt(dev, src, dst, num_aes_blocks); } int dm_aes_cbc_encrypt(struct udevice *dev, u8 *iv, u8 *src, u8 *dst, u32 num_aes_blocks) { const struct aes_ops *ops; if (!dev) return -ENODEV; ops = aes_get_ops(dev); if (!ops->aes_cbc_encrypt) return -ENOSYS; return ops->aes_cbc_encrypt(dev, iv, src, dst, num_aes_blocks); } int dm_aes_cbc_decrypt(struct udevice *dev, u8 *iv, u8 *src, u8 *dst, u32 num_aes_blocks) { const struct aes_ops *ops; if (!dev) return -ENODEV; ops = aes_get_ops(dev); if (!ops->aes_cbc_decrypt) return -ENOSYS; return ops->aes_cbc_decrypt(dev, iv, src, dst, num_aes_blocks); } static void left_shift_vector(u8 *in, u8 *out, int size) { int carry = 0; int i; for (i = size - 1; i >= 0; i--) { out[i] = (in[i] << 1) | carry; carry = in[i] >> 7; /* get most significant bit */ } } int dm_aes_cmac(struct udevice *dev, u8 *src, u8 *dst, u32 num_aes_blocks) { const u8 AES_CMAC_CONST_RB = 0x87; /* from RFC 4493, Figure 2.2 */ const u32 TMP_BUFFER_LEN = 128; u8 tmp_block[AES128_KEY_LENGTH] = { }; u8 k1[AES128_KEY_LENGTH]; u8 *tmp_buffer; int ret; log_debug("%s: 0x%p -> %p blocks %d\n", __func__, src, dst, num_aes_blocks); if (!num_aes_blocks) { log_debug("%s: called with 0 blocks!\n", __func__); return -1; } /* Compute K1 constant needed by AES-CMAC calculation */ ret = dm_aes_cbc_encrypt(dev, (u8 *)AES_ZERO_BLOCK, (u8 *)AES_ZERO_BLOCK, tmp_block, 1); if (ret) return -1; left_shift_vector(tmp_block, k1, AES_BLOCK_LENGTH); if ((tmp_block[0] >> 7) != 0) /* get MSB of L */ k1[AES128_KEY_LENGTH - 1] ^= AES_CMAC_CONST_RB; /* Set what will be the initial IV as zero */ memset(tmp_block, 0, AES_BLOCK_LENGTH); /* Process all blocks except last by calling engine several times per dma buffer size */ if (num_aes_blocks > 1) { tmp_buffer = malloc(AES_BLOCK_LENGTH * min(num_aes_blocks - 1, TMP_BUFFER_LEN)); while (num_aes_blocks > 1) { u32 blocks = min(num_aes_blocks - 1, TMP_BUFFER_LEN); /* Encrypt the current remaining set of blocks that fits in tmp buffer */ ret = dm_aes_cbc_encrypt(dev, tmp_block, src, tmp_buffer, blocks); if (ret) return -1; num_aes_blocks -= blocks; src += blocks * AES_BLOCK_LENGTH; /* Copy the last encrypted block to tmp_block as IV */ memcpy(tmp_block, tmp_buffer + ((blocks - 1) * AES_BLOCK_LENGTH), AES_BLOCK_LENGTH); } free(tmp_buffer); } if (num_aes_blocks != 1) { log_debug("%s: left with %d blocks! must be 1\n", __func__, num_aes_blocks); return -1; } /* XOR last IV with K1 */ aes_apply_cbc_chain_data(tmp_block, k1, tmp_block); /* Encrypt the last src block already with tmp_block as IV and output to dst */ return dm_aes_cbc_encrypt(dev, tmp_block, src, dst, 1); } UCLASS_DRIVER(aes) = { .id = UCLASS_AES, .name = "aes", }; |