openssl (version 0.8)

signature_create: Signatures

Description

Sign and verify a message digest. RSA supports both MD5 and SHA signatures whereas DSA and EC keys only support SHA.

Usage

signature_create(data, hash = sha1, key = my_key(), password = readline)
signature_verify(data, sig, hash = sha1, pubkey = my_pubkey())

Arguments

data

raw data vector or file path for message to be signed. If hash == NULL then data must be a hash string or raw vector.

hash

the digest function to use. Must be one of md5, sha1, sha256, sha512

key

private key or file path. See read_key.

password

string or a function to read protected keys. See read_key.

sig

raw vector or file path for the signature data.

pubkey

public key or file path. See read_pubkey.

Examples

# Generate a keypair
key <- rsa_keygen()
pubkey <- as.list(key)$pubkey

# Sign a file
data <- system.file("DESCRIPTION")
sig <- signature_create(data, key = key)
stopifnot(signature_verify(data, sig, pubkey = pubkey))

# Sign raw data
data <- serialize(iris, NULL)
sig <- signature_create(data, sha256, key = key)
stopifnot(signature_verify(data, sig, sha256, pubkey = pubkey))

# Sign a hash
md <- md5(data)
sig <- signature_create(md, hash = NULL, key = key)
stopifnot(signature_verify(md, sig, hash = NULL, pubkey = pubkey))

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