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| 1 | +/* |
| 2 | + * SPDX-License-Identifier: GPL-2.0+ |
| 3 | + */ |
| 4 | + |
| 5 | +#include <errno.h> |
| 6 | +#include <stdlib.h> |
| 7 | +#include <stdio.h> |
| 8 | +#include <stdint.h> |
| 9 | +#include <string.h> |
| 10 | + |
| 11 | +#include "aml_chksum.h" |
| 12 | +#include "sha256.h" |
| 13 | + |
| 14 | +static void printf_sha256_sum(const char *format, const uint8_t *sum) |
| 15 | +{ |
| 16 | + int index = 0; |
| 17 | + char str[SHA256_SUM_LEN * 2 + 1]; |
| 18 | + |
| 19 | + str[0] = '\0'; |
| 20 | + for (index = 0; index < SHA256_SUM_LEN; ++index) { |
| 21 | + sprintf(str, "%s%02x", str, sum[index]); |
| 22 | + } |
| 23 | + printf(format, str); |
| 24 | +} |
| 25 | + |
| 26 | +int main(int argc, char **argv) |
| 27 | +{ |
| 28 | + // aml_chksum takes one argument with the path to a u-boot.bin |
| 29 | + if (argc < 2) { |
| 30 | + printf("ERROR: Missing filename.\n"); |
| 31 | + return EINVAL; |
| 32 | + } |
| 33 | + char *filename = argv[1]; |
| 34 | + |
| 35 | + FILE *fp = fopen(filename, "r+b"); |
| 36 | + if (fp == NULL) { |
| 37 | + printf("Error: Cannot open file \"%s\": %s\n", filename, strerror(errno)); |
| 38 | + return errno; |
| 39 | + } |
| 40 | + |
| 41 | + // read header data from 0 |
| 42 | + uint8_t *header_buffer = calloc(AML_HEADER_READ_SIZE, sizeof(uint8_t)); |
| 43 | + if (fseek(fp, 0, SEEK_SET) != 0) { |
| 44 | + printf("ERROR: Cannot seek to header: %s\n", strerror(errno)); |
| 45 | + return errno; |
| 46 | + } |
| 47 | + int read_header_size = fread(header_buffer, sizeof(uint8_t), AML_HEADER_READ_SIZE, fp); |
| 48 | + if (read_header_size != AML_HEADER_READ_SIZE) { |
| 49 | + printf("ERROR: Cannot read header: %s\n", strerror(errno)); |
| 50 | + return errno; |
| 51 | + } |
| 52 | + |
| 53 | + // basic header check |
| 54 | + st_aml_block_header *header = (st_aml_block_header *)(header_buffer + AML_HEADER_OFFSET); |
| 55 | + if (header->dwMagic != AML_BLK_ID || |
| 56 | + header->byVerMajor != AML_BLK_VER_MJR || |
| 57 | + header->byVerMinor != AML_BLK_VER_MIN || |
| 58 | + header->bySizeHdr != AML_HEADER_SIZE || |
| 59 | + header->nSigType != 0 || |
| 60 | + header->nPUKType != 0) { |
| 61 | + printf("ERROR: Bad header.\n"); |
| 62 | + return EINVAL; |
| 63 | + } |
| 64 | + |
| 65 | + // sha256 sum is the 32b following the header |
| 66 | + uint8_t *origSum = (header_buffer + AML_HEADER_OFFSET + AML_HEADER_SIZE); |
| 67 | + |
| 68 | + printf("nTotalSize=%u\n", header->nTotalSize); |
| 69 | + printf("nCHKStart=%u\n", header->nCHKStart); |
| 70 | + printf("nCHKSize=%u\n", header->nCHKSize); |
| 71 | + printf("nDataOffset=%u\n", header->nDataOffset); |
| 72 | + printf("nDataLen=%u\n", header->nDataLen); |
| 73 | + printf_sha256_sum("origSum=%s\n", origSum); |
| 74 | + |
| 75 | + // initialize sha context |
| 76 | + uint8_t genSum[SHA256_SUM_LEN]; |
| 77 | + sha256_context ctx; |
| 78 | + sha256_starts(&ctx); |
| 79 | + |
| 80 | + // start with header |
| 81 | + sha256_update(&ctx, (uint8_t *)header, AML_HEADER_SIZE); |
| 82 | + |
| 83 | + // read raw data starting from header position + chk start |
| 84 | + uint8_t *data_buffer = calloc(header->nCHKSize, sizeof(uint8_t)); |
| 85 | + if (fseek(fp, AML_HEADER_OFFSET + header->nCHKStart, SEEK_SET) != 0) { |
| 86 | + printf("ERROR: Cannot seek to data: %s\n", strerror(errno)); |
| 87 | + return errno; |
| 88 | + } |
| 89 | + int read_data_size = fread(data_buffer, sizeof(uint8_t), header->nCHKSize, fp); |
| 90 | + if (read_data_size != header->nCHKSize) { |
| 91 | + printf("ERROR: Cannot read data: %s\n", strerror(errno)); |
| 92 | + return errno; |
| 93 | + } |
| 94 | + |
| 95 | + // append raw data and finish |
| 96 | + sha256_update(&ctx, data_buffer, header->nCHKSize); |
| 97 | + sha256_finish(&ctx, genSum); |
| 98 | + printf_sha256_sum("genSum=%s\n", genSum); |
| 99 | + |
| 100 | + // clone header |
| 101 | + uint8_t *sd_header_buffer = calloc(AML_HEADER_READ_SIZE, sizeof(uint8_t)); |
| 102 | + memcpy(sd_header_buffer, header_buffer, AML_HEADER_READ_SIZE); |
| 103 | + st_aml_block_header *sd_header = (st_aml_block_header *)(sd_header_buffer + AML_HEADER_OFFSET); |
| 104 | + uint8_t *sdSum = (sd_header_buffer + AML_HEADER_OFFSET + AML_HEADER_SIZE); |
| 105 | + |
| 106 | + // update sd header |
| 107 | + sd_header->nTotalSize -= AML_SD_OFFSET; |
| 108 | + sd_header->nDataLen -= AML_SD_OFFSET; |
| 109 | + sd_header->nCHKStart = AML_HEADER_SIZE + AML_CHKSUM_SIZE; // start after checksum |
| 110 | + sd_header->nCHKSize = sd_header->nTotalSize - sd_header->nCHKStart; // must be less then total size, bl1 only reads ~48kb to memory |
| 111 | + printf("nTotalSize=%u\n", sd_header->nTotalSize); |
| 112 | + printf("nCHKStart=%u\n", sd_header->nCHKStart); |
| 113 | + printf("nCHKSize=%u\n", sd_header->nCHKSize); |
| 114 | + printf("nDataOffset=%u\n", sd_header->nDataOffset); |
| 115 | + printf("nDataLen=%u\n", sd_header->nDataLen); |
| 116 | + |
| 117 | + // read raw data starting from sd header position + chk start |
| 118 | + free(data_buffer); |
| 119 | + data_buffer = calloc(sd_header->nCHKSize, sizeof(uint8_t)); |
| 120 | + if (fseek(fp, AML_SD_OFFSET + AML_HEADER_OFFSET + sd_header->nCHKStart, SEEK_SET) != 0) { |
| 121 | + printf("ERROR: Cannot seek to data: %s\n", strerror(errno)); |
| 122 | + return errno; |
| 123 | + } |
| 124 | + read_data_size = fread(data_buffer, sizeof(uint8_t), sd_header->nCHKSize, fp); |
| 125 | + if (read_data_size != sd_header->nCHKSize) { |
| 126 | + printf("ERROR: Cannot read data: %s\n", strerror(errno)); |
| 127 | + return errno; |
| 128 | + } |
| 129 | + |
| 130 | + // calculate checksum for sd header |
| 131 | + sha256_starts(&ctx); |
| 132 | + sha256_update(&ctx, (uint8_t *)sd_header, AML_HEADER_SIZE); |
| 133 | + sha256_update(&ctx, data_buffer, sd_header->nCHKSize); |
| 134 | + sha256_finish(&ctx, sdSum); |
| 135 | + printf_sha256_sum("sdSum=%s\n", sdSum); |
| 136 | + |
| 137 | + // write sd header to 512 |
| 138 | + if (fseek(fp, AML_SD_OFFSET, SEEK_SET) != 0) { |
| 139 | + printf("ERROR: Cannot seek to sd header: %s\n", strerror(errno)); |
| 140 | + return errno; |
| 141 | + } |
| 142 | + int write_size = fwrite(sd_header_buffer, sizeof(uint8_t), AML_HEADER_READ_SIZE, fp); |
| 143 | + if (write_size != AML_HEADER_READ_SIZE) { |
| 144 | + printf("ERROR: Cannot write sd header: %s\n", strerror(errno)); |
| 145 | + return errno; |
| 146 | + } |
| 147 | + fflush(fp); |
| 148 | + |
| 149 | + // new header |
| 150 | + header->nCHKStart = AML_SD_OFFSET - AML_HEADER_OFFSET; // must be 496+ for MBR support |
| 151 | + header->nCHKSize = header->nTotalSize - header->nCHKStart; // must be less then total size, bl1 only reads ~48kb to memory |
| 152 | + header->nDataOffset = 1024 - 16; // point to code that copies bl2 from 4608 to 4096 |
| 153 | + header->nDataLen = header->nTotalSize - header->nDataOffset; |
| 154 | + printf("nCHKStart=%u\n", header->nCHKStart); |
| 155 | + printf("nCHKSize=%u\n", header->nCHKSize); |
| 156 | + printf("nDataOffset=%u\n", header->nDataOffset); |
| 157 | + printf("nDataLen=%u\n", header->nDataLen); |
| 158 | + |
| 159 | + // read raw data starting from new header position + chk start |
| 160 | + free(data_buffer); |
| 161 | + data_buffer = calloc(header->nCHKSize, sizeof(uint8_t)); |
| 162 | + if (fseek(fp, AML_HEADER_OFFSET + header->nCHKStart, SEEK_SET) != 0) { |
| 163 | + printf("ERROR: Cannot seek to data: %s\n", strerror(errno)); |
| 164 | + return errno; |
| 165 | + } |
| 166 | + read_data_size = fread(data_buffer, sizeof(uint8_t), header->nCHKSize, fp); |
| 167 | + if (read_data_size != header->nCHKSize) { |
| 168 | + printf("ERROR: Cannot read data: %s\n", strerror(errno)); |
| 169 | + return errno; |
| 170 | + } |
| 171 | + |
| 172 | + // calculate checksum for new header |
| 173 | + sha256_starts(&ctx); |
| 174 | + sha256_update(&ctx, (uint8_t *)header, AML_HEADER_SIZE); |
| 175 | + sha256_update(&ctx, data_buffer, header->nCHKSize); |
| 176 | + sha256_finish(&ctx, origSum); |
| 177 | + printf_sha256_sum("newSum=%s\n", origSum); |
| 178 | + |
| 179 | + // write new header to 0 |
| 180 | + if (fseek(fp, 0, SEEK_SET) != 0) { |
| 181 | + printf("ERROR: Cannot seek to header: %s\n", strerror(errno)); |
| 182 | + return errno; |
| 183 | + } |
| 184 | + write_size = fwrite(header_buffer, sizeof(uint8_t), AML_HEADER_READ_SIZE, fp); |
| 185 | + if (write_size != AML_HEADER_READ_SIZE) { |
| 186 | + printf("ERROR: Cannot write header: %s\n", strerror(errno)); |
| 187 | + return errno; |
| 188 | + } |
| 189 | + fflush(fp); |
| 190 | + |
| 191 | + fclose(fp); |
| 192 | + free(data_buffer); |
| 193 | + free(header_buffer); |
| 194 | + free(sd_header_buffer); |
| 195 | + return 0; |
| 196 | +} |
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