Updated comment for multiply()/finiteFieldMultiply() in C++ and C code.

c/qrcodegen.c

@@ -462,7 +462,8 @@ testable void calcReedSolomonRemainder(const uint8_t data[], int dataLen, const
 }
 
 
-// Returns the product of the two given field elements modulo GF(2^8/0x11D). All argument values are valid.
+// Returns the product of the two given field elements modulo GF(2^8/0x11D).
+// All inputs are valid. This could be implemented as a 256*256 lookup table.
 testable uint8_t finiteFieldMultiply(uint8_t x, uint8_t y) {
 	// Russian peasant multiplication
 	uint8_t z = 0;

cpp/QrCode.hpp

@@ -283,8 +283,8 @@ class QrCode final {
 		
 		/*-- Static function --*/
 		
-		// Returns the product of the two given field elements modulo GF(2^8/0x11D). The arguments and result
-		// are unsigned 8-bit integers. This could be implemented as a lookup table of 256*256 entries of uint8.
+		// Returns the product of the two given field elements modulo GF(2^8/0x11D).
+		// All inputs are valid. This could be implemented as a 256*256 lookup table.
 		private: static std::uint8_t multiply(std::uint8_t x, std::uint8_t y);
 		
 	};