/usr/lib/R/site-library/openssl/INDEX is in r-cran-openssl 1.0.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | aes_cbc                 Symmetric AES encryption
askpass                 Password Prompt Utility
base64_encode           Encode and decode base64
bignum                  Big number arithmetic
cert_verify             X509 certificates
ec_dh                   Diffie-Hellman Key Agreement
encrypt_envelope        Envelope encryption
fingerprint             OpenSSH fingerprint
hashing                 Vectorized hash/hmac functions
keygen                  Generate Key pair
my_key                  Default keypair
openssl                 Toolkit for Encryption, Signatures and
                        Certificates based on OpenSSL
openssl_config          OpenSSL Configuration Info
rand_bytes              Generate random bytes and numbers with OpenSSL
read_key                Parsing keys and certificates
rsa_encrypt             Low-level RSA encryption
signature_create        Signatures
write_p12               PKCS7 / PKCS12 bundles
write_pem               Export key or certificate
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