| /* |
| * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. |
| * |
| * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * Neither the name of ARM nor the names of its contributors may be used |
| * to endorse or promote products derived from this software without specific |
| * prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <arm_def.h> |
| #include <assert.h> |
| #include <platform.h> |
| #include <stdint.h> |
| #include <string.h> |
| |
| /* Weak definition may be overridden in specific platform */ |
| #pragma weak plat_match_rotpk |
| |
| /* SHA256 algorithm */ |
| #define SHA256_BYTES 32 |
| |
| /* ROTPK locations */ |
| #define ARM_ROTPK_REGS_ID 1 |
| #define ARM_ROTPK_DEVEL_RSA_ID 2 |
| |
| #if !ARM_ROTPK_LOCATION_ID |
| #error "ARM_ROTPK_LOCATION_ID not defined" |
| #endif |
| |
| static const unsigned char rotpk_hash_hdr[] = \ |
| "\x30\x31\x30\x0D\x06\x09\x60\x86\x48" \ |
| "\x01\x65\x03\x04\x02\x01\x05\x00\x04\x20"; |
| static const unsigned int rotpk_hash_hdr_len = sizeof(rotpk_hash_hdr) - 1; |
| static unsigned char rotpk_hash_der[sizeof(rotpk_hash_hdr) - 1 + SHA256_BYTES]; |
| |
| #if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) |
| static const unsigned char arm_devel_rotpk_hash[] = \ |
| "\xB0\xF3\x82\x09\x12\x97\xD8\x3A" \ |
| "\x37\x7A\x72\x47\x1B\xEC\x32\x73" \ |
| "\xE9\x92\x32\xE2\x49\x59\xF6\x5E" \ |
| "\x8B\x4A\x4A\x46\xD8\x22\x9A\xDA"; |
| #endif |
| |
| /* |
| * Check the validity of the key |
| * |
| * 0 = success, Otherwise = error |
| */ |
| int plat_match_rotpk(const unsigned char *key_buf, unsigned int key_len) |
| { |
| /* TODO: check against the ROT key stored in the platform */ |
| return 0; |
| } |
| |
| /* |
| * Return the ROTPK hash in the following ASN.1 structure in DER format: |
| * |
| * AlgorithmIdentifier ::= SEQUENCE { |
| * algorithm OBJECT IDENTIFIER, |
| * parameters ANY DEFINED BY algorithm OPTIONAL |
| * } |
| * |
| * DigestInfo ::= SEQUENCE { |
| * digestAlgorithm AlgorithmIdentifier, |
| * digest OCTET STRING |
| * } |
| */ |
| int plat_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len, |
| unsigned int *flags) |
| { |
| uint8_t *dst; |
| |
| assert(key_ptr != NULL); |
| assert(key_len != NULL); |
| assert(flags != NULL); |
| |
| /* Copy the DER header */ |
| memcpy(rotpk_hash_der, rotpk_hash_hdr, rotpk_hash_hdr_len); |
| dst = (uint8_t *)&rotpk_hash_der[rotpk_hash_hdr_len]; |
| |
| #if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) |
| memcpy(dst, arm_devel_rotpk_hash, SHA256_BYTES); |
| #elif (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_REGS_ID) |
| uint32_t *src, tmp; |
| unsigned int words, i; |
| |
| /* |
| * Append the hash from Trusted Root-Key Storage registers. The hash has |
| * not been written linearly into the registers, so we have to do a bit |
| * of byte swapping: |
| * |
| * 0x00 0x04 0x08 0x0C 0x10 0x14 0x18 0x1C |
| * +---------------------------------------------------------------+ |
| * | Reg0 | Reg1 | Reg2 | Reg3 | Reg4 | Reg5 | Reg6 | Reg7 | |
| * +---------------------------------------------------------------+ |
| * | ... ... | | ... ... | |
| * | +--------------------+ | +-------+ |
| * | | | | |
| * +----------------------------+ +----------------------------+ |
| * | | | | |
| * +-------+ | +--------------------+ | |
| * | | | | |
| * v v v v |
| * +---------------------------------------------------------------+ |
| * | | | |
| * +---------------------------------------------------------------+ |
| * 0 15 16 31 |
| * |
| * Additionally, we have to access the registers in 32-bit words |
| */ |
| words = SHA256_BYTES >> 3; |
| |
| /* Swap bytes 0-15 (first four registers) */ |
| src = (uint32_t *)TZ_PUB_KEY_HASH_BASE; |
| for (i = 0 ; i < words ; i++) { |
| tmp = src[words - 1 - i]; |
| /* Words are read in little endian */ |
| *dst++ = (uint8_t)((tmp >> 24) & 0xFF); |
| *dst++ = (uint8_t)((tmp >> 16) & 0xFF); |
| *dst++ = (uint8_t)((tmp >> 8) & 0xFF); |
| *dst++ = (uint8_t)(tmp & 0xFF); |
| } |
| |
| /* Swap bytes 16-31 (last four registers) */ |
| src = (uint32_t *)(TZ_PUB_KEY_HASH_BASE + SHA256_BYTES / 2); |
| for (i = 0 ; i < words ; i++) { |
| tmp = src[words - 1 - i]; |
| *dst++ = (uint8_t)((tmp >> 24) & 0xFF); |
| *dst++ = (uint8_t)((tmp >> 16) & 0xFF); |
| *dst++ = (uint8_t)((tmp >> 8) & 0xFF); |
| *dst++ = (uint8_t)(tmp & 0xFF); |
| } |
| #endif /* (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) */ |
| |
| *key_ptr = (void *)rotpk_hash_der; |
| *key_len = (unsigned int)sizeof(rotpk_hash_der); |
| *flags = ROTPK_IS_HASH; |
| return 0; |
| } |
| |