Minor documentation improvements

Author: kernelmethod

README.md

@@ -15,6 +15,11 @@ ciphers. This package provides:
   building blocks for other cryptographic primitives, such as the
   ChaCha20-Poly1305 AEAD algorithm.
 
+The default stream cipher provided by this package follows [Daniel Bernstein's
+original implementation](https://cr.yp.to/chacha.html) (using a 64-bit counter
+and 64-bit nonce), which allows you to generate 1 ZiB of random data before the
+nonce must be recycled.
+
 ## Usage
 
 You can start using ChaChaCiphers.jl for random number generation by creating a

src/cuda_keystream.jl

@@ -32,6 +32,7 @@ julia> x = CuVector{Float32}(undef, 2^10);
 DocTestSetup = nothing
 ```
 
+See also: [`ChaChaStream`](@ref)
 """
 mutable struct CUDAChaChaStream <: AbstractChaChaStream
     key :: CuVector{UInt32}

src/keystream.jl

@@ -49,6 +49,8 @@ julia> randstring(stream, 'a':'z', 8)
 ```@meta
 DocTestSetup = nothing
 ```
+
+See also: [`CUDAChaChaStream`](@ref)
 """
 mutable struct ChaChaStream <: AbstractChaChaStream
     key :: SVector{8,UInt32}