certificates: X509 certificates

In openssl: Toolkit for Encryption, Signatures and Certificates Based on OpenSSL

X509 certificates

Description

Read, download, analyze and verify X.509 certificates.

Usage

cert_verify(cert, root = ca_bundle())

download_ssl_cert(host = "localhost", port = 443, ipv4_only = FALSE)

ca_bundle()

Arguments

cert	certificate (or certificate-chain) to be verified. Must be cert or list or path.
root	trusted pubkey or certificate(s) e.g. CA bundle.
host	string: hostname of the server to connect to
port	string or integer: port or protocol to use, e.g: 443 or "https"
ipv4_only	do not use IPv6 connections

See Also

read_cert

Examples

# Verify the r-project HTTPS cert
chain <- download_ssl_cert("cran.r-project.org", 443)
print(chain)
cert_data <- as.list(chain[[1]])
print(cert_data$pubkey)
print(cert_data$alt_names)
cert_verify(chain, ca_bundle())

# Write cert in PEM format
cat(write_pem(chain[[1]]))

openssl documentation built on June 8, 2025, 11 a.m.