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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,6 @@ | ||
| [submodule "mbedtls"] | ||
| path = mbedtls | ||
| url = https://github.com/ARMmbed/mbedtls | ||
| [submodule "tiny-AES-c"] | ||
| path = tiny-AES-c | ||
| url = https://github.com/kokke/tiny-AES-c |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| #include <assert.h> | ||
| #include <string.h> | ||
| #include <stdint.h> | ||
| #include <stdio.h> | ||
| #include <unistd.h> | ||
|
|
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| #include "aes.h" | ||
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| void read_hex(const char *hex_str, uint8_t *out_buf, size_t len) { | ||
| for (size_t i = 0; i < len; ++i) { | ||
| assert(sscanf(hex_str, "%02hhx", &out_buf[i]) == 1); | ||
| hex_str += 2; | ||
| } | ||
| } | ||
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| void print_hex(const uint8_t *buf, size_t len) { | ||
| for (size_t i = 0; i < len; ++i) { | ||
| printf("%02hhx", buf[i]); | ||
| } | ||
| } | ||
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| uint8_t key[0x10]; | ||
| uint8_t iv[0x10]; | ||
| uint8_t ct[0x10]; | ||
| uint8_t pt[0x10]; | ||
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| void aes_do_dec(const uint8_t *key_in, size_t key_sz, uint8_t *iv_in, const uint8_t *ct_in, uint8_t *pt_out, size_t sz_in) { | ||
| struct AES_ctx ctx; | ||
| memcpy(pt_out, ct_in, sz_in); | ||
| AES_init_ctx_iv(&ctx, key, iv); | ||
| AES_CBC_decrypt_buffer(&ctx, pt_out, sz_in); | ||
| return; | ||
| } | ||
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| __attribute__((noinline)) | ||
| void aes_init_marker(void) { | ||
| asm volatile("nop\n\t"); | ||
| return; | ||
| } | ||
|
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| void aes_do_dec_wrapped(void) { | ||
| static int done_init = 0; | ||
| if (!done_init) { | ||
| aes_init_marker(); | ||
| } | ||
| aes_do_dec(key, sizeof(key), iv, ct, pt, sizeof(ct)); | ||
| #ifdef __arm__ | ||
| _exit(243); | ||
| #endif | ||
| } | ||
|
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| int main(int argc, const char **argv) { | ||
| _Static_assert(sizeof(ct) == sizeof(pt), "ct and pt size differ"); | ||
| if (argc != 4) { | ||
| printf("Usage: %s <key hex> <iv hex> <ct hex>\n", argv[0]); | ||
| return -1; | ||
| } | ||
| read_hex(argv[1], key, sizeof(key)); | ||
| read_hex(argv[2], iv, sizeof(iv)); | ||
| read_hex(argv[3], ct, sizeof(pt)); | ||
| // aes_do_dec(key, sizeof(key), iv, ct, pt, sizeof(ct)); | ||
| aes_do_dec_wrapped(); | ||
| print_hex(pt, sizeof(pt)); | ||
| puts(""); | ||
| return 0; | ||
| } |
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Submodule tiny-AES-c
added at
0677e4