/* * Copyright (c) 2015-2016, 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 #include #include #include #include #include /* Weak definition may be overridden in specific platform */ #pragma weak plat_match_rotpk #pragma weak plat_get_nv_ctr #pragma weak plat_set_nv_ctr /* 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 /* * 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; } /* * Return the non-volatile counter value stored in the platform. The cookie * will contain the OID of the counter in the certificate. * * Return: 0 = success, Otherwise = error */ int plat_get_nv_ctr(void *cookie, unsigned int *nv_ctr) { const char *oid; uint32_t *nv_ctr_addr; assert(cookie != NULL); assert(nv_ctr != NULL); oid = (const char *)cookie; if (strcmp(oid, TRUSTED_FW_NVCOUNTER_OID) == 0) { nv_ctr_addr = (uint32_t *)TFW_NVCTR_BASE; } else if (strcmp(oid, NON_TRUSTED_FW_NVCOUNTER_OID) == 0) { nv_ctr_addr = (uint32_t *)NTFW_CTR_BASE; } else { return 1; } *nv_ctr = (unsigned int)(*nv_ctr_addr); return 0; } /* * Store a new non-volatile counter value. By default on ARM development * platforms, the non-volatile counters are RO and cannot be modified. We expect * the values in the certificates to always match the RO values so that this * function is never called. * * Return: 0 = success, Otherwise = error */ int plat_set_nv_ctr(void *cookie, unsigned int nv_ctr) { return 1; }