#include "crypto_aead.h" #include "api.h" #include "uartp.h" #define MAX_BYTES 100 #define CMDBUF_LEN 72 static uint8_t cmdbuf[CMDBUF_LEN]; #define CRYPTO_BUSY 12 #define SerialOut Serial uint8_t npub[CRYPTO_NPUBBYTES]; uint8_t nsec[CRYPTO_NSECBYTES]; uint8_t k[CRYPTO_KEYBYTES]; uint8_t ad[MAX_BYTES]; uint8_t m[MAX_BYTES]; uint8_t c[MAX_BYTES]; unsigned long long int adlen = 0; unsigned long long int mlen = 0; unsigned long long int clen = 0; int res = 0; void setup(); void loop(); #ifdef __cplusplus extern "C" { #endif void uart_wbyte(uint8_t x) { SerialOut.write((uint8_t) (x)); } uint8_t uart_rbyte() { int r; do { r = SerialOut.read(); } while (r == -1); return (uint8_t) (0xff & r); } #ifdef __cplusplus } #endif void my_assert(bool b) { if (b) return; for(;;) yield(); } void setup() { SerialOut.begin(500000); pinMode(CRYPTO_BUSY, OUTPUT); digitalWrite(CRYPTO_BUSY, HIGH); delay(100); memset(npub, 0, CRYPTO_NPUBBYTES); memset(nsec, 0, CRYPTO_NSECBYTES); memset(k, 0, CRYPTO_KEYBYTES); memset(ad, 0, MAX_BYTES); memset(m, 0, MAX_BYTES); memset(c, 0, MAX_BYTES); SerialOut.print("Hello, World!"); } void loop() { int res; uint16_t len = uartp_recv(cmdbuf, CMDBUF_LEN - 1); uint8_t action = cmdbuf[0]; if (len == 0 || len > CMDBUF_LEN - 1) return; uint16_t l = len - 1; uint16_t rl = 0; uint8_t *var = cmdbuf+1; switch (action) { case 'm': my_assert(l <= MAX_BYTES); memcpy(m, var, l); mlen = l; break; case 'c': my_assert(l <= MAX_BYTES); memcpy(c, var, l); clen = l; break; case 'a': my_assert(l <= MAX_BYTES); memcpy(ad, var, l); adlen = l; break; case 'k': my_assert(l == CRYPTO_KEYBYTES); memcpy(k, var, l); break; case 'p': my_assert(l == CRYPTO_NPUBBYTES); memcpy(npub, var, l); break; case 's': my_assert(l == CRYPTO_NSECBYTES); memcpy(nsec, var, l); break; case 'e': noInterrupts(); asm("nop"); digitalWrite(CRYPTO_BUSY, LOW); res = crypto_aead_encrypt(c, &clen, m, mlen, ad, adlen, nsec, npub, k); digitalWrite(CRYPTO_BUSY, HIGH); asm("nop"); interrupts(); break; case 'd': noInterrupts(); asm("nop"); digitalWrite(CRYPTO_BUSY, LOW); res = crypto_aead_decrypt(m, &mlen, nsec, c, clen, ad, adlen, npub, k); digitalWrite(CRYPTO_BUSY, HIGH); asm("nop"); interrupts(); break; case'M': var = m; rl = mlen; break; case'C': var = c; rl = clen; break; case'A': var = ad; rl = adlen; break; case'K': var = k; rl = CRYPTO_KEYBYTES; break; case'P': var = npub; rl = CRYPTO_NPUBBYTES; break; case'S': var = nsec; rl = CRYPTO_NSECBYTES; break; case'R': var = (uint8_t *) &res; rl = sizeof(res); break; default: my_assert(false); } cmdbuf[0] = action; memcpy(cmdbuf+1, var, rl); uartp_send(cmdbuf, rl+1); }