Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions are met: |
| 6 | * |
| 7 | * Redistributions of source code must retain the above copyright notice, this |
| 8 | * list of conditions and the following disclaimer. |
| 9 | * |
| 10 | * Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * Neither the name of ARM nor the names of its contributors may be used |
| 15 | * to endorse or promote products derived from this software without specific |
| 16 | * prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 28 | * POSSIBILITY OF SUCH DAMAGE. |
| 29 | */ |
| 30 | |
Juan Castillo | 31a68f0 | 2015-04-14 12:49:03 +0100 | [diff] [blame] | 31 | #include <arm_def.h> |
| 32 | #include <assert.h> |
| 33 | #include <platform.h> |
| 34 | #include <stdint.h> |
| 35 | #include <string.h> |
| 36 | |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 37 | /* Weak definition may be overridden in specific platform */ |
| 38 | #pragma weak plat_match_rotpk |
Juan Castillo | 31a68f0 | 2015-04-14 12:49:03 +0100 | [diff] [blame] | 39 | |
| 40 | /* SHA256 algorithm */ |
| 41 | #define SHA256_BYTES 32 |
| 42 | |
| 43 | /* ROTPK locations */ |
| 44 | #define ARM_ROTPK_REGS_ID 1 |
| 45 | #define ARM_ROTPK_DEVEL_RSA_ID 2 |
| 46 | |
| 47 | #if !ARM_ROTPK_LOCATION_ID |
| 48 | #error "ARM_ROTPK_LOCATION_ID not defined" |
| 49 | #endif |
| 50 | |
| 51 | static const unsigned char rotpk_hash_hdr[] = \ |
| 52 | "\x30\x31\x30\x0D\x06\x09\x60\x86\x48" \ |
| 53 | "\x01\x65\x03\x04\x02\x01\x05\x00\x04\x20"; |
| 54 | static const unsigned int rotpk_hash_hdr_len = sizeof(rotpk_hash_hdr) - 1; |
| 55 | static unsigned char rotpk_hash_der[sizeof(rotpk_hash_hdr) - 1 + SHA256_BYTES]; |
| 56 | |
| 57 | #if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) |
| 58 | static const unsigned char arm_devel_rotpk_hash[] = \ |
| 59 | "\xB0\xF3\x82\x09\x12\x97\xD8\x3A" \ |
| 60 | "\x37\x7A\x72\x47\x1B\xEC\x32\x73" \ |
| 61 | "\xE9\x92\x32\xE2\x49\x59\xF6\x5E" \ |
| 62 | "\x8B\x4A\x4A\x46\xD8\x22\x9A\xDA"; |
| 63 | #endif |
| 64 | |
Dan Handley | 9df4804 | 2015-03-19 18:58:55 +0000 | [diff] [blame] | 65 | /* |
Juan Castillo | 31a68f0 | 2015-04-14 12:49:03 +0100 | [diff] [blame] | 66 | * Return the ROTPK hash in the following ASN.1 structure in DER format: |
| 67 | * |
| 68 | * AlgorithmIdentifier ::= SEQUENCE { |
| 69 | * algorithm OBJECT IDENTIFIER, |
| 70 | * parameters ANY DEFINED BY algorithm OPTIONAL |
| 71 | * } |
| 72 | * |
| 73 | * DigestInfo ::= SEQUENCE { |
| 74 | * digestAlgorithm AlgorithmIdentifier, |
| 75 | * digest OCTET STRING |
| 76 | * } |
| 77 | */ |
| 78 | int plat_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len, |
| 79 | unsigned int *flags) |
| 80 | { |
| 81 | uint8_t *dst; |
| 82 | |
| 83 | assert(key_ptr != NULL); |
| 84 | assert(key_len != NULL); |
| 85 | assert(flags != NULL); |
| 86 | |
| 87 | /* Copy the DER header */ |
| 88 | memcpy(rotpk_hash_der, rotpk_hash_hdr, rotpk_hash_hdr_len); |
| 89 | dst = (uint8_t *)&rotpk_hash_der[rotpk_hash_hdr_len]; |
| 90 | |
| 91 | #if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) |
| 92 | memcpy(dst, arm_devel_rotpk_hash, SHA256_BYTES); |
| 93 | #elif (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_REGS_ID) |
| 94 | uint32_t *src, tmp; |
| 95 | unsigned int words, i; |
| 96 | |
| 97 | /* |
| 98 | * Append the hash from Trusted Root-Key Storage registers. The hash has |
| 99 | * not been written linearly into the registers, so we have to do a bit |
| 100 | * of byte swapping: |
| 101 | * |
| 102 | * 0x00 0x04 0x08 0x0C 0x10 0x14 0x18 0x1C |
| 103 | * +---------------------------------------------------------------+ |
| 104 | * | Reg0 | Reg1 | Reg2 | Reg3 | Reg4 | Reg5 | Reg6 | Reg7 | |
| 105 | * +---------------------------------------------------------------+ |
| 106 | * | ... ... | | ... ... | |
| 107 | * | +--------------------+ | +-------+ |
| 108 | * | | | | |
| 109 | * +----------------------------+ +----------------------------+ |
| 110 | * | | | | |
| 111 | * +-------+ | +--------------------+ | |
| 112 | * | | | | |
| 113 | * v v v v |
| 114 | * +---------------------------------------------------------------+ |
| 115 | * | | | |
| 116 | * +---------------------------------------------------------------+ |
| 117 | * 0 15 16 31 |
| 118 | * |
| 119 | * Additionally, we have to access the registers in 32-bit words |
| 120 | */ |
| 121 | words = SHA256_BYTES >> 3; |
| 122 | |
| 123 | /* Swap bytes 0-15 (first four registers) */ |
| 124 | src = (uint32_t *)TZ_PUB_KEY_HASH_BASE; |
| 125 | for (i = 0 ; i < words ; i++) { |
| 126 | tmp = src[words - 1 - i]; |
| 127 | /* Words are read in little endian */ |
| 128 | *dst++ = (uint8_t)((tmp >> 24) & 0xFF); |
| 129 | *dst++ = (uint8_t)((tmp >> 16) & 0xFF); |
| 130 | *dst++ = (uint8_t)((tmp >> 8) & 0xFF); |
| 131 | *dst++ = (uint8_t)(tmp & 0xFF); |
| 132 | } |
| 133 | |
| 134 | /* Swap bytes 16-31 (last four registers) */ |
| 135 | src = (uint32_t *)(TZ_PUB_KEY_HASH_BASE + SHA256_BYTES / 2); |
| 136 | for (i = 0 ; i < words ; i++) { |
| 137 | tmp = src[words - 1 - i]; |
| 138 | *dst++ = (uint8_t)((tmp >> 24) & 0xFF); |
| 139 | *dst++ = (uint8_t)((tmp >> 16) & 0xFF); |
| 140 | *dst++ = (uint8_t)((tmp >> 8) & 0xFF); |
| 141 | *dst++ = (uint8_t)(tmp & 0xFF); |
| 142 | } |
| 143 | #endif /* (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) */ |
| 144 | |
| 145 | *key_ptr = (void *)rotpk_hash_der; |
| 146 | *key_len = (unsigned int)sizeof(rotpk_hash_der); |
| 147 | *flags = ROTPK_IS_HASH; |
| 148 | return 0; |
| 149 | } |
| 150 | |