* Implemented RSA-2048-PSS + SHA256 signature verification.
* Refactored RSA-2048-OAEP decryption steps to use mbedtls function calls.
* Implemented NCA header main signature verification.
* Replaced Björn Samuelsson's CRC32 algorithm with the hardware accelerated CRC32 checksum calculation from libnx (latest commit with support for calculation in blocks).