R: Curve25519

curve25519 {openssl} | R Documentation

## Curve25519

### Description

Curve25519 is a recently added low-level algorithm that can be used both for diffie-hellman (called X25519) and for signatures (called ED25519). Note that these functions are only available when building against version 1.1.1 or newer of the openssl library. The same functions are also available in the sodium R package.

### Usage

    read_ed25519_key(x)

    read_ed25519_pubkey(x)

    read_x25519_key(x)

    read_x25519_pubkey(x)

    ed25519_sign(data, key)

    ed25519_verify(data, sig, pubkey)

    x25519_diffie_hellman(key, pubkey)

### Arguments

`x` | a 32 byte raw vector with (pub)key data
`data` | raw vector with data to sign or verify
`key` | private key as returned by `read_ed25519_key` or `ed25519_keygen`
`sig` | raw vector of length 64 with signature as returned by `ed25519_sign`
`pubkey` | public key as returned by `read_ed25519_pubkey` or `key$pubkey`

### Examples

    # Generate a keypair
    if(openssl_config()$x25519){
    key <- ed25519_keygen()
    pubkey <- as.list(key)$pubkey

    # Sign message
    msg <- serialize(iris, NULL)
    sig <- ed25519_sign(msg, key)

    # Verify the signature
    ed25519_verify(msg, sig, pubkey)

    # Diffie Hellman example:
    key1 <- x25519_keygen()
    key2 <- x25519_keygen()

    # Both parties can derive the same secret
    x25519_diffie_hellman(key1, key2$pubkey)
    x25519_diffie_hellman(key2, key1$pubkey)

    # Import/export sodium keys
    rawkey <- sodium::sig_keygen()
    rawpubkey <- sodium::sig_pubkey(rawkey)
    key <- read_ed25519_key(rawkey)
    pubkey <- read_ed25519_pubkey(rawpubkey)

    # To get the raw key data back for use in sodium
    as.list(key)$data
    as.list(pubkey)$data
    }

[Package openssl version 2.0.2 Index]