BigIntegerDB - A fixed-width, header-only BigInteger class.

Compilers Supported

- Microsoft Visual C++ 2017
- Mingw (Coming Soon)

- googletest (for testing only)

Header-only
- By being header-only, the feature can be easily included into other projects by just copying the file in. It only depends on the standard library.
Fixed-width
- Provides type-safety that is highly-beneficial for applications that encode or decode byte-arrays and integers of particular key-lengths.
- Examples from cryptography:
  - An API for a SHA256 hash could return a BigIntegerDB<32> object, indicating to the consumer that the calculated hash will be exactly 32 bytes.
  - An API for a 128-bit ECDSA (Elliptic Curve Digital Signature Algorithm) could require a private-key parameter of BigIntegerDB<16>, so the consumer doesn't mistakenly pass in the public key (which would be 32 bytes).
Fast Multiplication: Uses Double/Shift and add algorithm (https://en.wikipedia.org/wiki/Multiplication_algorithm#Shift_and_add)
Fast Division and Modulo: TODO: Provide link to algorithm

Addition
- Adding 2 BigIntegers of the same byte-size together.
- Adding a primitive int to a BigInteger.
Subtraction
- Subtracting 2 BigIntegers of the same byte-size together.
- Subtracting a primitive int from a BigInteger.
Multiplication
- Multiplying 2 BigInteger of the same byte-size together.
- Multiplying a BigInteger by a primitive int.
Division
- Dividing a BigInteger by another BigInteger of the same byte-size together.
- Dividing a BigInteger by a primitive int.
Modulus
- Performing a modulo on 2 BigIntegers of the same byte-size together.
- Performing a modulo on a BigInteger and a primitive int.
Hex Conversion
- Converts a hex string into a BigInteger.
Unsigned char* conversion
- Converts an unsigned char(uint8_t) array to a BigInteger.
- Converts a BigInteger to an unsigned char(uint8_t) array.
Primitive int conversion
- Converts a primitive integer into a BigInteger.