secp256k1-native

gem install secp256k1-native

gem install secp256k1-native

```ruby
require 'secp256k1'

# Generator point
g = Secp256k1::Point.generator

# Scalar multiplication (constant-time by default — safe for all scalars)
secret = 0xcafebabe
pubkey = g.mul(secret)
puts pubkey.x.to_s(16)

# Variable-time scalar multiplication (faster, for public scalars only)
scalar = 0xdeadbeef
point = g.mul_vt(scalar)

# SEC1 encoding / decoding
compressed = pubkey.to_octet_string(:compressed)    # 33 bytes
uncompressed = pubkey.to_octet_string(:uncompressed) # 65 bytes
decoded = Secp256k1::Point.from_bytes(compressed)

# Field arithmetic
a = Secp256k1::P - 1
b = Secp256k1.fmul(a, a)      # modular multiplication
c = Secp256k1.fadd(a, b)      # modular addition
d = Secp256k1.finv(a)         # modular inverse (Fermat)

# Scalar arithmetic (mod N)
k = Secp256k1.scalar_inv(42)  # scalar inverse
```