458 lines
16 KiB
Rust
458 lines
16 KiB
Rust
use ffi;
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use std::fmt;
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use std::ptr;
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use std::mem;
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use libc::{c_int, c_void, c_char};
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use {cvt, cvt_p, cvt_n};
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use bn::{BigNum, BigNumRef};
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use bio::{MemBio, MemBioSlice};
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use error::ErrorStack;
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use util::{CallbackState, invoke_passwd_cb};
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use types::OpenSslTypeRef;
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/// Type of encryption padding to use.
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#[derive(Copy, Clone)]
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pub struct Padding(c_int);
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pub const NO_PADDING: Padding = Padding(ffi::RSA_NO_PADDING);
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pub const PKCS1_PADDING: Padding = Padding(ffi::RSA_PKCS1_PADDING);
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pub const PKCS1_OAEP_PADDING: Padding = Padding(ffi::RSA_PKCS1_OAEP_PADDING);
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type_!(Rsa, RsaRef, ffi::RSA, ffi::RSA_free);
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impl RsaRef {
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/// Writes an RSA private key as unencrypted PEM formatted data
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pub fn private_key_to_pem(&self) -> Result<Vec<u8>, ErrorStack> {
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let mem_bio = try!(MemBio::new());
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unsafe {
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try!(cvt(ffi::PEM_write_bio_RSAPrivateKey(mem_bio.as_ptr(),
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self.as_ptr(),
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ptr::null(),
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ptr::null_mut(),
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0,
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None,
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ptr::null_mut())));
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}
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Ok(mem_bio.get_buf().to_owned())
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}
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/// Writes an RSA public key as PEM formatted data
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pub fn public_key_to_pem(&self) -> Result<Vec<u8>, ErrorStack> {
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let mem_bio = try!(MemBio::new());
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unsafe {
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try!(cvt(ffi::PEM_write_bio_RSA_PUBKEY(mem_bio.as_ptr(), self.as_ptr())));
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}
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Ok(mem_bio.get_buf().to_owned())
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}
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pub fn size(&self) -> usize {
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unsafe {
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assert!(self.n().is_some());
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ffi::RSA_size(self.as_ptr()) as usize
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}
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}
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/// Decrypts data using the private key, returning the number of decrypted bytes.
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///
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/// # Panics
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///
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/// Panics if `self` has no private components, or if `to` is smaller
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/// than `self.size()`.
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pub fn private_decrypt(&self,
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from: &[u8],
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to: &mut [u8],
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padding: Padding)
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-> Result<usize, ErrorStack> {
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assert!(self.d().is_some(), "private components missing");
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assert!(from.len() <= i32::max_value() as usize);
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assert!(to.len() >= self.size());
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unsafe {
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let len = try!(cvt_n(ffi::RSA_private_decrypt(from.len() as c_int,
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from.as_ptr(),
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to.as_mut_ptr(),
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self.as_ptr(),
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padding.0)));
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Ok(len as usize)
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}
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}
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/// Encrypts data using the private key, returning the number of encrypted bytes.
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///
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/// # Panics
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///
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/// Panics if `self` has no private components, or if `to` is smaller
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/// than `self.size()`.
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pub fn private_encrypt(&self,
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from: &[u8],
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to: &mut [u8],
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padding: Padding)
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-> Result<usize, ErrorStack> {
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assert!(self.d().is_some(), "private components missing");
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assert!(from.len() <= i32::max_value() as usize);
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assert!(to.len() >= self.size());
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unsafe {
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let len = try!(cvt_n(ffi::RSA_private_encrypt(from.len() as c_int,
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from.as_ptr(),
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to.as_mut_ptr(),
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self.as_ptr(),
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padding.0)));
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Ok(len as usize)
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}
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}
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/// Decrypts data using the public key, returning the number of decrypted bytes.
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///
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/// # Panics
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///
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/// Panics if `to` is smaller than `self.size()`.
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pub fn public_decrypt(&self,
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from: &[u8],
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to: &mut [u8],
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padding: Padding)
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-> Result<usize, ErrorStack> {
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assert!(from.len() <= i32::max_value() as usize);
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assert!(to.len() >= self.size());
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unsafe {
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let len = try!(cvt_n(ffi::RSA_public_decrypt(from.len() as c_int,
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from.as_ptr(),
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to.as_mut_ptr(),
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self.as_ptr(),
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padding.0)));
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Ok(len as usize)
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}
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}
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/// Encrypts data using the private key, returning the number of encrypted bytes.
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///
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/// # Panics
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///
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/// Panics if `to` is smaller than `self.size()`.
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pub fn public_encrypt(&self,
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from: &[u8],
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to: &mut [u8],
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padding: Padding)
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-> Result<usize, ErrorStack> {
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assert!(from.len() <= i32::max_value() as usize);
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assert!(to.len() >= self.size());
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unsafe {
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let len = try!(cvt_n(ffi::RSA_public_encrypt(from.len() as c_int,
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from.as_ptr(),
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to.as_mut_ptr(),
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self.as_ptr(),
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padding.0)));
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Ok(len as usize)
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}
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}
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pub fn n(&self) -> Option<&BigNumRef> {
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unsafe {
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let n = compat::key(self.as_ptr())[0];
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if n.is_null() {
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None
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} else {
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Some(BigNumRef::from_ptr(n as *mut _))
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}
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}
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}
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pub fn d(&self) -> Option<&BigNumRef> {
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unsafe {
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let d = compat::key(self.as_ptr())[2];
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if d.is_null() {
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None
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} else {
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Some(BigNumRef::from_ptr(d as *mut _))
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}
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}
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}
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pub fn e(&self) -> Option<&BigNumRef> {
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unsafe {
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let e = compat::key(self.as_ptr())[1];
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if e.is_null() {
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None
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} else {
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Some(BigNumRef::from_ptr(e as *mut _))
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}
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}
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}
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pub fn p(&self) -> Option<&BigNumRef> {
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unsafe {
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let p = compat::factors(self.as_ptr())[0];
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if p.is_null() {
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None
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} else {
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Some(BigNumRef::from_ptr(p as *mut _))
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}
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}
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}
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pub fn q(&self) -> Option<&BigNumRef> {
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unsafe {
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let q = compat::factors(self.as_ptr())[1];
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if q.is_null() {
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None
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} else {
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Some(BigNumRef::from_ptr(q as *mut _))
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}
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}
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}
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}
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impl Rsa {
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/// only useful for associating the key material directly with the key, it's safer to use
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/// the supplied load and save methods for DER formatted keys.
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pub fn from_public_components(n: BigNum, e: BigNum) -> Result<Rsa, ErrorStack> {
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unsafe {
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let rsa = Rsa(try!(cvt_p(ffi::RSA_new())));
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try!(cvt(compat::set_key(rsa.0,
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n.as_ptr(),
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e.as_ptr(),
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ptr::null_mut())));
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mem::forget((n, e));
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Ok(rsa)
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}
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}
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pub fn from_private_components(n: BigNum,
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e: BigNum,
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d: BigNum,
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p: BigNum,
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q: BigNum,
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dp: BigNum,
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dq: BigNum,
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qi: BigNum)
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-> Result<Rsa, ErrorStack> {
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unsafe {
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let rsa = Rsa(try!(cvt_p(ffi::RSA_new())));
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try!(cvt(compat::set_key(rsa.0, n.as_ptr(), e.as_ptr(), d.as_ptr())));
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mem::forget((n, e, d));
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try!(cvt(compat::set_factors(rsa.0, p.as_ptr(), q.as_ptr())));
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mem::forget((p, q));
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try!(cvt(compat::set_crt_params(rsa.0, dp.as_ptr(), dq.as_ptr(),
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qi.as_ptr())));
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mem::forget((dp, dq, qi));
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Ok(rsa)
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}
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}
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/// Generates a public/private key pair with the specified size.
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///
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/// The public exponent will be 65537.
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pub fn generate(bits: u32) -> Result<Rsa, ErrorStack> {
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unsafe {
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let rsa = Rsa(try!(cvt_p(ffi::RSA_new())));
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let e = try!(BigNum::from_u32(ffi::RSA_F4 as u32));
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try!(cvt(ffi::RSA_generate_key_ex(rsa.0, bits as c_int, e.as_ptr(), ptr::null_mut())));
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Ok(rsa)
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}
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}
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/// Reads an RSA private key from PEM formatted data.
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pub fn private_key_from_pem(buf: &[u8]) -> Result<Rsa, ErrorStack> {
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let mem_bio = try!(MemBioSlice::new(buf));
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unsafe {
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let rsa = try!(cvt_p(ffi::PEM_read_bio_RSAPrivateKey(mem_bio.as_ptr(),
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ptr::null_mut(),
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None,
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ptr::null_mut())));
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Ok(Rsa(rsa))
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}
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}
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/// Reads an RSA private key from PEM formatted data and supplies a password callback.
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pub fn private_key_from_pem_cb<F>(buf: &[u8], pass_cb: F) -> Result<Rsa, ErrorStack>
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where F: FnOnce(&mut [c_char]) -> usize
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{
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let mut cb = CallbackState::new(pass_cb);
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let mem_bio = try!(MemBioSlice::new(buf));
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unsafe {
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let cb_ptr = &mut cb as *mut _ as *mut c_void;
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let rsa = try!(cvt_p(ffi::PEM_read_bio_RSAPrivateKey(mem_bio.as_ptr(),
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ptr::null_mut(),
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Some(invoke_passwd_cb::<F>),
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cb_ptr)));
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Ok(Rsa(rsa))
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}
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}
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/// Reads an RSA public key from PEM formatted data.
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pub fn public_key_from_pem(buf: &[u8]) -> Result<Rsa, ErrorStack> {
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let mem_bio = try!(MemBioSlice::new(buf));
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unsafe {
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let rsa = try!(cvt_p(ffi::PEM_read_bio_RSA_PUBKEY(mem_bio.as_ptr(),
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ptr::null_mut(),
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None,
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ptr::null_mut())));
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Ok(Rsa(rsa))
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}
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}
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}
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impl fmt::Debug for Rsa {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "Rsa")
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}
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}
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#[cfg(ossl110)]
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mod compat {
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use std::ptr;
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use ffi::{self, BIGNUM, RSA};
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use libc::c_int;
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pub unsafe fn key(r: *const RSA) -> [*const BIGNUM; 3] {
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let (mut n, mut e, mut d) = (ptr::null(), ptr::null(), ptr::null());
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ffi::RSA_get0_key(r, &mut n, &mut e, &mut d);
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[n, e, d]
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}
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pub unsafe fn factors(r: *const RSA) -> [*const BIGNUM; 2] {
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let (mut p, mut q) = (ptr::null(), ptr::null());
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ffi::RSA_get0_factors(r, &mut p, &mut q);
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[p, q]
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}
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pub unsafe fn set_key(r: *mut RSA, n: *mut BIGNUM, e: *mut BIGNUM, d: *mut BIGNUM) -> c_int {
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ffi::RSA_set0_key(r, n, e, d)
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}
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pub unsafe fn set_factors(r: *mut RSA, p: *mut BIGNUM, q: *mut BIGNUM) -> c_int {
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ffi::RSA_set0_factors(r, p, q)
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}
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pub unsafe fn set_crt_params(r: *mut RSA,
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dmp1: *mut BIGNUM,
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dmq1: *mut BIGNUM,
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iqmp: *mut BIGNUM)
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-> c_int {
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ffi::RSA_set0_crt_params(r, dmp1, dmq1, iqmp)
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}
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}
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#[cfg(ossl10x)]
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mod compat {
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use libc::c_int;
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use ffi::{BIGNUM, RSA};
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pub unsafe fn key(r: *const RSA) -> [*const BIGNUM; 3] {
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[(*r).n, (*r).e, (*r).d]
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}
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pub unsafe fn factors(r: *const RSA) -> [*const BIGNUM; 2] {
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[(*r).p, (*r).q]
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}
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pub unsafe fn set_key(r: *mut RSA, n: *mut BIGNUM, e: *mut BIGNUM, d: *mut BIGNUM) -> c_int {
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(*r).n = n;
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(*r).e = e;
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(*r).d = d;
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1 // TODO: is this right? should it be 0? what's success?
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}
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pub unsafe fn set_factors(r: *mut RSA, p: *mut BIGNUM, q: *mut BIGNUM) -> c_int {
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(*r).p = p;
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(*r).q = q;
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1 // TODO: is this right? should it be 0? what's success?
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}
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pub unsafe fn set_crt_params(r: *mut RSA,
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dmp1: *mut BIGNUM,
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dmq1: *mut BIGNUM,
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iqmp: *mut BIGNUM)
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-> c_int {
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(*r).dmp1 = dmp1;
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(*r).dmq1 = dmq1;
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(*r).iqmp = iqmp;
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1 // TODO: is this right? should it be 0? what's success?
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}
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}
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#[cfg(test)]
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mod test {
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use libc::c_char;
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use super::*;
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#[test]
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pub fn test_password() {
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let mut password_queried = false;
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let key = include_bytes!("../test/rsa-encrypted.pem");
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Rsa::private_key_from_pem_cb(key, |password| {
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password_queried = true;
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password[0] = b'm' as c_char;
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password[1] = b'y' as c_char;
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password[2] = b'p' as c_char;
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password[3] = b'a' as c_char;
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password[4] = b's' as c_char;
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password[5] = b's' as c_char;
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6
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})
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.unwrap();
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assert!(password_queried);
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}
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#[test]
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pub fn test_public_encrypt_private_decrypt_with_padding() {
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let key = include_bytes!("../test/rsa.pem.pub");
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let public_key = Rsa::public_key_from_pem(key).unwrap();
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let mut result = vec![0; public_key.size()];
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let original_data = b"This is test";
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let len = public_key.public_encrypt(original_data, &mut result, PKCS1_PADDING).unwrap();
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assert_eq!(len, 256);
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let pkey = include_bytes!("../test/rsa.pem");
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let private_key = Rsa::private_key_from_pem(pkey).unwrap();
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let mut dec_result = vec![0; private_key.size()];
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let len = private_key.private_decrypt(&result, &mut dec_result, PKCS1_PADDING).unwrap();
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assert_eq!(&dec_result[..len], original_data);
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}
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#[test]
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fn test_private_encrypt() {
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let k0 = super::Rsa::generate(512).unwrap();
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let k0pkey = k0.public_key_to_pem().unwrap();
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let k1 = super::Rsa::public_key_from_pem(&k0pkey).unwrap();
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let msg = vec![0xdeu8, 0xadu8, 0xd0u8, 0x0du8];
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let mut emesg = vec![0; k0.size()];
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k0.private_encrypt(&msg, &mut emesg, PKCS1_PADDING).unwrap();
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let mut dmesg = vec![0; k1.size()];
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let len = k1.public_decrypt(&emesg, &mut dmesg, PKCS1_PADDING).unwrap();
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assert_eq!(msg, &dmesg[..len]);
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}
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#[test]
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fn test_public_encrypt() {
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let k0 = super::Rsa::generate(512).unwrap();
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let k0pkey = k0.private_key_to_pem().unwrap();
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let k1 = super::Rsa::private_key_from_pem(&k0pkey).unwrap();
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let msg = vec![0xdeu8, 0xadu8, 0xd0u8, 0x0du8];
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let mut emesg = vec![0; k0.size()];
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k0.public_encrypt(&msg, &mut emesg, PKCS1_PADDING).unwrap();
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let mut dmesg = vec![0; k1.size()];
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let len = k1.private_decrypt(&emesg, &mut dmesg, PKCS1_PADDING).unwrap();
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assert_eq!(msg, &dmesg[..len]);
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}
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}
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