| Martin Roth | c7acf16 | 2020-05-28 00:44:50 -0600 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | |
| 3 | #include <2crypto.h> |
| 4 | #include <2return_codes.h> |
| 5 | #include <bl_uapp/bl_syscall_public.h> |
| 6 | #include <commonlib/bsd/helpers.h> |
| 7 | #include <console/console.h> |
| 8 | #include "psp_verstage.h" |
| 9 | #include <stddef.h> |
| 10 | #include <string.h> |
| 11 | #include <vb2_api.h> |
| 12 | |
| 13 | static struct SHA_GENERIC_DATA_T sha_op; |
| 14 | static uint32_t sha_op_size_remaining; |
| 15 | static uint8_t __attribute__((aligned(32))) sha_hash[64]; |
| 16 | |
| 17 | vb2_error_t vb2ex_hwcrypto_digest_init(enum vb2_hash_algorithm hash_alg, uint32_t data_size) |
| 18 | { |
| 19 | printk(BIOS_DEBUG, "Calculating hash of %d bytes\n", data_size); |
| 20 | |
| 21 | sha_op_size_remaining = data_size; |
| 22 | |
| 23 | if (hash_alg == VB2_HASH_SHA256) { |
| 24 | sha_op.SHAType = SHA_TYPE_256; |
| 25 | sha_op.DigestLen = 32; |
| 26 | } else if (hash_alg == VB2_HASH_SHA512) { |
| 27 | sha_op.SHAType = SHA_TYPE_512; |
| 28 | sha_op.DigestLen = 64; |
| 29 | } else { |
| 30 | printk(BIOS_INFO, "Unsupported hash_alg %d!\n", hash_alg); |
| 31 | return VB2_ERROR_EX_HWCRYPTO_UNSUPPORTED; |
| 32 | } |
| 33 | |
| 34 | /* Set init flag for first operation */ |
| 35 | sha_op.Init = 1; |
| 36 | |
| 37 | /* Clear eom flag until last operation */ |
| 38 | sha_op.Eom = 0; |
| 39 | |
| 40 | /* Need documentation on this b:157610147 */ |
| 41 | sha_op.DataMemType = 2; |
| 42 | |
| 43 | sha_op.Digest = sha_hash; |
| 44 | |
| 45 | sha_op.IntermediateDigest = NULL; |
| 46 | |
| 47 | sha_op.IntermediateMsgLen = 0; |
| 48 | |
| 49 | return VB2_SUCCESS; |
| 50 | } |
| 51 | |
| 52 | vb2_error_t vb2ex_hwcrypto_digest_extend(const uint8_t *buf, uint32_t size) |
| 53 | { |
| 54 | uint32_t retval; |
| 55 | sha_op.Data = (uint8_t *) buf; |
| 56 | |
| 57 | if (!sha_op_size_remaining) { |
| 58 | printk(BIOS_ERR, "ERROR: got more data than expected.\n"); |
| 59 | return VB2_ERROR_UNKNOWN; |
| 60 | } |
| 61 | |
| 62 | while (size) { |
| 63 | sha_op.DataLen = size; |
| 64 | |
| 65 | sha_op_size_remaining -= sha_op.DataLen; |
| 66 | |
| 67 | /* Set eom flag for final operation */ |
| 68 | if (sha_op_size_remaining == 0) |
| 69 | sha_op.Eom = 1; |
| 70 | |
| 71 | retval = svc_crypto_sha(&sha_op, SHA_GENERIC); |
| 72 | if (retval) { |
| 73 | printk(BIOS_ERR, "ERROR: HW crypto failed - errorcode: %#x\n", |
| 74 | retval); |
| 75 | return VB2_ERROR_UNKNOWN; |
| 76 | } |
| 77 | |
| 78 | /* Clear init flag after first operation */ |
| 79 | if (sha_op.Init == 1) |
| 80 | sha_op.Init = 0; |
| 81 | |
| 82 | size -= sha_op.DataLen; |
| 83 | } |
| 84 | |
| 85 | return VB2_SUCCESS; |
| 86 | } |
| 87 | |
| 88 | /* Copy the hash back to verstage */ |
| 89 | vb2_error_t vb2ex_hwcrypto_digest_finalize(uint8_t *digest, uint32_t digest_size) |
| 90 | { |
| 91 | if (sha_op.Eom == 0) { |
| 92 | printk(BIOS_ERR, "ERROR: Got less data than expected.\n"); |
| 93 | return VB2_ERROR_UNKNOWN; |
| 94 | } |
| 95 | |
| 96 | if (digest_size != sha_op.DigestLen) { |
| 97 | printk(BIOS_ERR, "ERROR: Digest size does not match expected length.\n"); |
| 98 | return VB2_ERROR_UNKNOWN; |
| 99 | } |
| 100 | |
| 101 | memcpy(digest, sha_hash, digest_size); |
| 102 | |
| 103 | return VB2_SUCCESS; |
| 104 | } |