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One Time Password Generation and Verification

Github: https://github.com/randy3k/otp

Documentation: https://randy3k.github.io/otp

Generating and validating One-time Password based on Hash-based Message Authentication Code (HOTP) and Time Based One-time Password (TOTP) according to RFC 4226 https://datatracker.ietf.org/doc/html/rfc4226 and RFC 6238 https://datatracker.ietf.org/doc/html/rfc6238.

Installation

You can install the released version of otp from CRAN with:

install.packages("otp")

And the development version from GitHub with:

# install.packages("devtools")
devtools::install_github("randy3k/otp")

Example

library(otp)

HMAC based One Time Password (HOTP)

p <- HOTP$new("JBSWY3DPEHPK3PXP")
p$at(8)

## [1] "964230"

p$verify("964230", 8)

## [1] 8

Time based One Time Password (TOTP)

p <- TOTP$new("JBSWY3DPEHPK3PXP")
(code <- p$now())

## [1] "012318"

p$verify(code)

## [1] "2024-01-22 15:55:30 PST"

raster::image(
  qrencoder::qrencode_raster(p$provisioning_uri("otp")),
  asp = 1, col = c("white", "black"), axes = FALSE,
  xlab = "", ylab = ""
)

Related projects

• Ruby’s rotp.
• Python’s pyotp.
• ropt, an R library for client side one time password management.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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