R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'openssl'

openssl::bignum |  | Fun with bignum: how RSA encryption works | HTML | source | R code
openssl::crypto_hashing |  | Cryptographic Hashing in R | HTML | source | R code
openssl::keys |  | Importing and exporting RSA/DSA/EC keys | HTML | source | R code
openssl::secure_rng |  | Generating Secure Random Numbers in R | HTML | source | R code