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Cryptographic code for Substrate chains in pure rust with better baremetal support.

This is largely based on sp_core crate.

Key differences here:

  • no-std compatible with arm,
  • sr25519 supports external Rng, for usability on baremetal
  • ecdsa support based on pure Rust crate k256, to avoid compiling difficulties (original sp-core has ecdsa from secp256k1 C wrapper crate and it does not compile on certain no-std targets and creates extremely large binary blob on others)