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#' OpenSSH fingerprint
#'
#' Calculates the OpenSSH fingerprint of a public key. This value should
#' match what you get to see when connecting with SSH to a server. Note
#' that some other systems might use a different algorithm to derive a
#' (different) fingerprint for the same keypair.
#'
#' @export
#' @param key a public or private key
#' @param hashfun which hash function to use to calculate the fingerprint
#' @examples mykey <- rsa_keygen()
#' pubkey <- as.list(mykey)$pubkey
#' fingerprint(mykey)
#' fingerprint(pubkey)
#'
#' # Some systems use other hash functions
#' fingerprint(pubkey, sha1)
#' fingerprint(pubkey, sha256)
#'
#' # Other key types
#' fingerprint(dsa_keygen())
fingerprint <- function(key, hashfun = sha256){
UseMethod("fingerprint")
}
#' @export
fingerprint.key <- function(key, hashfun = sha256){
pubkey <- derive_pubkey(key)
fingerprint(pubkey, hashfun = hashfun)
}
#' @export
fingerprint.pubkey <- function(key, hashfun = sha256){
hashdata <- fpdata(key)
hashfun(unlist(unname(hashdata)))
}
fpdata <- function(pubkey){
UseMethod("fpdata")
}
fpdata.rsa <- function(pubkey){
input <- c(list(charToRaw("ssh-rsa")), decompose(pubkey))
lapply(input, function(x){
c(writeBin(length(x), raw(), endian = "big"), x)
})
}
fpdata.dsa <- function(pubkey){
input <- c(list(charToRaw("ssh-dss")), decompose(pubkey))
lapply(input, function(x){
c(writeBin(length(x), raw(), endian = "big"), x)
})
}
fpdata.ecdsa <- function(pubkey){
bindata <- decompose(pubkey)
nist_name <- bindata[[1]]
ssh_name <- switch(nist_name,
"P-256" = "nistp256",
"P-384" = "nistp384",
"P-521" = "nistp521",
stop("Unknown curve type: ", nist_name)
)
keydata <- c(as.raw(4), bindata[[2]], bindata[[3]])
input <- c(list(charToRaw(paste0("ecdsa-sha2-", ssh_name))), list(charToRaw(ssh_name)), list(keydata))
lapply(input, function(x){
c(writeBin(length(x), raw(), endian = "big"), x)
})
}
fpdata.x25519 <- function(pubkey){
buf <- write_raw_pubkey(pubkey)
input <- c(list(charToRaw("ssh-x25519")), list(buf))
lapply(input, function(x){
c(writeBin(length(x), raw(), endian = "big"), x)
})
}
fpdata.ed25519 <- function(pubkey){
buf <- write_raw_pubkey(pubkey)
input <- c(list(charToRaw("ssh-ed25519")), list(buf))
lapply(input, function(x){
c(writeBin(length(x), raw(), endian = "big"), x)
})
}
#' @useDynLib openssl R_pubkey_type
pubkey_type <- function(key){
.Call(R_pubkey_type, key)
}
#' @useDynLib openssl R_pubkey_bitsize
pubkey_bitsize <- function(key){
.Call(R_pubkey_bitsize, key)
}
decompose <- function(x, ...){
UseMethod("decompose")
}
decompose.pubkey <- function(x, ...){
UseMethod("pubkey_decompose")
}
decompose.key <- function(x, ...){
UseMethod("priv_decompose")
}
#' @useDynLib openssl R_rsa_pubkey_decompose
pubkey_decompose.rsa <- function(key){
out <- .Call(R_rsa_pubkey_decompose, key)
structure(out, names = c("e", "n"))
}
#' @useDynLib openssl R_rsa_priv_decompose
priv_decompose.rsa <- function(key){
out <- .Call(R_rsa_priv_decompose, key)
structure(out, names = c("e", "n", "p", "q", "d", "dp", "dq", "qi"))
}
#' @useDynLib openssl R_dsa_pubkey_decompose
pubkey_decompose.dsa <- function(key){
out <- .Call(R_dsa_pubkey_decompose, key)
structure(out, names = c("p", "q", "g", "y"))
}
#' @useDynLib openssl R_dsa_priv_decompose
priv_decompose.dsa <- function(key){
out <- .Call(R_dsa_priv_decompose, key)
structure(out, names = c("p", "q", "g", "y", "x"))
}
#' @useDynLib openssl R_ecdsa_pubkey_decompose
pubkey_decompose.ecdsa <- function(key){
out <- .Call(R_ecdsa_pubkey_decompose, key)
structure(out, names = c("curve", "x", "y"))
}
#' @useDynLib openssl R_ecdsa_priv_decompose
priv_decompose.ecdsa <- function(key){
out <- .Call(R_ecdsa_priv_decompose, key)
structure(out, names = c("curve", "x", "y", "secret"))
}
pubkey_decompose.x25519 <- pubkey_decompose.ed25519 <- function(x){
write_raw_pubkey(x)
}
priv_decompose.ed25519 <- priv_decompose.x25519 <- function(x){
write_raw_key(x)
}
privdata <- function(x, ...){
UseMethod("priv_keydata")
}
priv_keydata.rsa <- function(key){
privdata <- decompose(key)
c('ssh-rsa', privdata[c("n", "e", "d", "qi", "p", "q")])
}
priv_keydata.dsa <- function(key){
data <- decompose(key)
c('ssh-dss', data[c("p", "q", "g", "y", "x")])
}
priv_keydata.ecdsa <- function(key){
privdata <- decompose(key)
curve <- switch(privdata$curve,
"P-256" = "nistp256",
"P-384" = "nistp384",
"P-521" = "nistp521",
stop("Unknown curve type: ", privdata$curve)
)
list(paste0("ecdsa-sha2-", curve), curve, c(as.raw(4), privdata$x, privdata$y), privdata$secret)
}
priv_keydata.ed25519 <- function(key){
pubdata <- decompose(key$pubkey)
privdata <- decompose(key)
list("ssh-ed25519", pubdata, c(privdata, pubdata))
}
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