WS: add protocol Acurite 592TXR

OFW PR 1916 by Skorpionm

lib/subghz/blocks/math.c

@@ -216,4 +216,34 @@ uint16_t subghz_protocol_blocks_lfsr_digest16(
         }
     }
     return sum;
+}
+
+uint8_t subghz_protocol_blocks_add_bytes(uint8_t const message[], unsigned num_bytes) {
+    int result = 0;
+    for(unsigned i = 0; i < num_bytes; ++i) {
+        result += message[i];
+    }
+    return (uint8_t)result;
+}
+
+int subghz_protocol_blocks_parity8(uint8_t byte) {
+    byte ^= byte >> 4;
+    byte &= 0xf;
+    return (0x6996 >> byte) & 1;
+}
+
+int subghz_protocol_blocks_parity_bytes(uint8_t const message[], unsigned num_bytes) {
+    int result = 0;
+    for(unsigned i = 0; i < num_bytes; ++i) {
+        result ^= subghz_protocol_blocks_parity8(message[i]);
+    }
+    return result;
+}
+
+uint8_t subghz_protocol_blocks_xor_bytes(uint8_t const message[], unsigned num_bytes) {
+    uint8_t result = 0;
+    for(unsigned i = 0; i < num_bytes; ++i) {
+        result ^= message[i];
+    }
+    return result;
 }

lib/subghz/blocks/math.h

@@ -161,6 +161,37 @@ uint16_t subghz_protocol_blocks_lfsr_digest16(
     uint16_t gen,
     uint16_t key);
 
+/**
+ *  Compute Addition of a number of bytes.
+ *  @param message bytes of message data
+ *  @param num_bytes number of bytes to sum
+ *  @return summation value
+ **/
+uint8_t subghz_protocol_blocks_add_bytes(uint8_t const message[], unsigned num_bytes);
+
+/**
+ *  Compute bit parity of a single byte (8 bits).
+ *  @param byte single byte to check
+ *  @return 1 odd parity, 0 even parity
+ **/
+int subghz_protocol_blocks_parity8(uint8_t byte);
+
+/**
+ *  Compute bit parity of a number of bytes.
+ *  @param message bytes of message data
+ *  @param num_bytes number of bytes to sum
+ *  @return 1 odd parity, 0 even parity
+ **/
+int subghz_protocol_blocks_parity_bytes(uint8_t const message[], unsigned num_bytes);
+
+/**
+ *  Compute XOR (byte-wide parity) of a number of bytes.
+ *  @param message bytes of message data
+ *  @param num_bytes number of bytes to sum
+ *  @return summation value, per bit-position 1 odd parity, 0 even parity
+ **/
+uint8_t subghz_protocol_blocks_xor_bytes(uint8_t const message[], unsigned num_bytes);
+
 #ifdef __cplusplus
 }
 #endif