Created
February 28, 2020 20:38
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Glitching attack on Atmega328
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| #include <avr/io.h> | |
| #include <stdio.h> | |
| #include <stdint.h> | |
| #include <string.h> | |
| #include <util/delay.h> | |
| #include "aes.h" | |
| #define UART_BAUD 9600 | |
| char HEX[] = { | |
| '0', '1', '2', '3', | |
| '4', '5', '6', '7', | |
| '8', '9', 'A', 'B', | |
| 'C', 'D', 'E', 'F' | |
| }; | |
| uint8_t secret[] = { | |
| 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, | |
| 0xd6, 0xaa, 0x74, 0xfd, 0xd2, 0xaf, 0x72, 0xfa, 0xda, 0xa6, 0x78, 0xf1, 0xd6, 0xab, 0x76, 0xfe, | |
| 0xb6, 0x92, 0xcf, 0x0b, 0x64, 0x3d, 0xbd, 0xf1, 0xbe, 0x9b, 0xc5, 0x00, 0x68, 0x30, 0xb3, 0xfe, | |
| 0xb6, 0xff, 0x74, 0x4e, 0xd2, 0xc2, 0xc9, 0xbf, 0x6c, 0x59, 0x0c, 0xbf, 0x04, 0x69, 0xbf, 0x41, | |
| 0x47, 0xf7, 0xf7, 0xbc, 0x95, 0x35, 0x3e, 0x03, 0xf9, 0x6c, 0x32, 0xbc, 0xfd, 0x05, 0x8d, 0xfd, | |
| 0x3c, 0xaa, 0xa3, 0xe8, 0xa9, 0x9f, 0x9d, 0xeb, 0x50, 0xf3, 0xaf, 0x57, 0xad, 0xf6, 0x22, 0xaa, | |
| 0x5e, 0x39, 0x0f, 0x7d, 0xf7, 0xa6, 0x92, 0x96, 0xa7, 0x55, 0x3d, 0xc1, 0x0a, 0xa3, 0x1f, 0x6b, | |
| 0x14, 0xf9, 0x70, 0x1a, 0xe3, 0x5f, 0xe2, 0x8c, 0x44, 0x0a, 0xdf, 0x4d, 0x4e, 0xa9, 0xc0, 0x26, | |
| 0x47, 0x43, 0x87, 0x35, 0xa4, 0x1c, 0x65, 0xb9, 0xe0, 0x16, 0xba, 0xf4, 0xae, 0xbf, 0x7a, 0xd2, | |
| 0x54, 0x99, 0x32, 0xd1, 0xf0, 0x85, 0x57, 0x68, 0x10, 0x93, 0xed, 0x9c, 0xbe, 0x2c, 0x97, 0x4e, | |
| 0x13, 0x11, 0x1d, 0x7f, 0xe3, 0x94, 0x4a, 0x17, 0xf3, 0x07, 0xa7, 0x8b, 0x4d, 0x2b, 0x30, 0xc5 | |
| }; | |
| void uart_init(void) { | |
| UBRR0 = (F_CPU / (16UL * UART_BAUD)) - 1; | |
| UCSR0B = _BV(TXEN0) | _BV(RXEN0); | |
| } | |
| void uart_putchar(char c) { | |
| loop_until_bit_is_set(UCSR0A, UDRE0); | |
| UDR0 = c; | |
| } | |
| void uart_putstr(char *s) { | |
| while (*s) { | |
| uart_putchar(*s); | |
| s++; | |
| } | |
| } | |
| void uart_hex(uint8_t c) { | |
| uart_putchar(HEX[c >> 4]); | |
| uart_putchar(HEX[c & 0xf]); | |
| } | |
| int main (void) { | |
| uart_init(); | |
| aes_expanded_key_t key; | |
| uint8_t pt[AES_BLOCKSIZE]; | |
| uart_putstr("hi\n\r"); | |
| while(1) { | |
| PORTB |= _BV(PORTB5); | |
| memcpy(key.bytes, secret, sizeof secret); | |
| memset(pt, 0, sizeof pt); | |
| encrypt(pt, &key); | |
| PORTB |= ~_BV(PORTB5); | |
| for (uint8_t i = 0; i < sizeof pt; i++) | |
| uart_hex(pt[i]); | |
| uart_putchar('\n'); | |
| uart_putchar('\r'); | |
| } | |
| } | |
| /* Serial Output: | |
| hi | |
| E4A54AE83F9C11FA165582BF28B0C8AC | |
| E4A54AD23F9CA3FA16FE82BFB0B0C8AC | |
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| F422B2610F2BBFC273E3B5E2F000FF80 | |
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| 961EE601FC1E9C327CE9EB8A2E581E4A | |
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| A92F091C1FF076898255619ACB83BB95 | |
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| */ |
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