Module magma

Implementation of GOST R 34.12-2015 (RFC 8891) and GOST 28147-89 (RFC 5830) "Magma" block ciphers

Differences between GOST R 34.12-2015 and GOST 28147-89:

• GOST R 34.12-2015 uses fixed S-Box (ID_TC26_GOST_28147_PARAM_Z)
• GOST R 34.12-2015 uses BE byte order (instead of LE in GOST 28147-89)