403 lines
11 KiB
Rust
403 lines
11 KiB
Rust
use std::cast;
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use std::libc::{c_int, c_uint};
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use std::libc;
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use std::ptr;
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use std::vec;
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#[allow(non_camel_case_types)]
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pub type EVP_PKEY = *libc::c_void;
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#[allow(non_camel_case_types)]
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pub type ANYKEY = *libc::c_void;
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#[allow(non_camel_case_types)]
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pub type RSA = *libc::c_void;
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mod libcrypto {
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use super::*;
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use std::libc::{c_int, c_uint};
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#[link_args = "-lcrypto"]
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extern "C" {
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fn EVP_PKEY_new() -> *EVP_PKEY;
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fn EVP_PKEY_free(k: *EVP_PKEY);
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fn EVP_PKEY_assign(k: *EVP_PKEY, t: c_int, inner: *ANYKEY) -> c_int;
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fn EVP_PKEY_get1_RSA(k: *EVP_PKEY) -> *RSA;
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fn i2d_PublicKey(k: *EVP_PKEY, buf: **mut u8) -> c_int;
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fn d2i_PublicKey(t: c_int, k: **EVP_PKEY, buf: **u8, len: c_uint) -> *EVP_PKEY;
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fn i2d_PrivateKey(k: *EVP_PKEY, buf: **mut u8) -> c_int;
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fn d2i_PrivateKey(t: c_int, k: **EVP_PKEY, buf: **u8, len: c_uint) -> *EVP_PKEY;
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fn RSA_generate_key(modsz: c_uint, e: c_uint, cb: *u8, cbarg: *u8) -> *RSA;
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fn RSA_size(k: *RSA) -> c_uint;
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fn RSA_public_encrypt(flen: c_uint, from: *u8, to: *mut u8, k: *RSA,
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pad: c_int) -> c_int;
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fn RSA_private_decrypt(flen: c_uint, from: *u8, to: *mut u8, k: *RSA,
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pad: c_int) -> c_int;
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fn RSA_sign(t: c_int, m: *u8, mlen: c_uint, sig: *mut u8, siglen: *mut c_uint,
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k: *RSA) -> c_int;
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fn RSA_verify(t: c_int, m: *u8, mlen: c_uint, sig: *u8, siglen: c_uint,
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k: *RSA) -> c_int;
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}
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}
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enum Parts {
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Neither,
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Public,
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Both
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}
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#[doc = "Represents a role an asymmetric key might be appropriate for."]
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pub enum Role {
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Encrypt,
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Decrypt,
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Sign,
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Verify
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}
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fn rsa_to_any(rsa: *RSA) -> *ANYKEY {
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unsafe {
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cast::transmute(rsa)
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}
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}
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fn any_to_rsa(anykey: *ANYKEY) -> *RSA {
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unsafe {
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cast::transmute(anykey)
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}
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}
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pub struct PKey {
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priv evp: *EVP_PKEY,
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priv parts: Parts,
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}
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pub fn PKey() -> PKey {
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PKey {
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evp: unsafe { libcrypto::EVP_PKEY_new() },
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parts: Neither
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}
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}
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///Represents a public key, optionally with a private key attached.
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impl PKey {
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fn _tostr(&self, f: extern "C" unsafe fn(*EVP_PKEY, **mut u8) -> c_int) -> ~[u8] {
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unsafe {
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let len = f(self.evp, ptr::null());
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if len < 0 as c_int { return ~[]; }
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let mut s = vec::from_elem(len as uint, 0u8);
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let r = do s.as_mut_buf |buf, _| {
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f(self.evp, &buf)
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};
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s.truncate(r as uint);
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s
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}
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}
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fn _fromstr(&mut self, s: &[u8], f: extern "C" unsafe fn(c_int, **EVP_PKEY, **u8, c_uint) -> *EVP_PKEY) {
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do s.as_imm_buf |ps, len| {
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let evp = ptr::null();
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unsafe {
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f(6 as c_int, &evp, &ps, len as c_uint);
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}
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self.evp = evp;
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}
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}
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pub fn gen(&mut self, keysz: uint) {
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unsafe {
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let rsa = libcrypto::RSA_generate_key(
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keysz as c_uint,
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65537u as c_uint,
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ptr::null(),
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ptr::null()
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);
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let rsa_ = rsa_to_any(rsa);
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// XXX: 6 == NID_rsaEncryption
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libcrypto::EVP_PKEY_assign(self.evp, 6 as c_int, rsa_);
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self.parts = Both;
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}
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}
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/**
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* Returns a serialized form of the public key, suitable for load_pub().
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*/
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pub fn save_pub(&self) -> ~[u8] {
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self._tostr(libcrypto::i2d_PublicKey)
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}
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/**
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* Loads a serialized form of the public key, as produced by save_pub().
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*/
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pub fn load_pub(&mut self, s: &[u8]) {
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self._fromstr(s, libcrypto::d2i_PublicKey);
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self.parts = Public;
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}
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/**
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* Returns a serialized form of the public and private keys, suitable for
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* load_priv().
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*/
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pub fn save_priv(&self) -> ~[u8] {
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self._tostr(libcrypto::i2d_PrivateKey)
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}
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/**
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* Loads a serialized form of the public and private keys, as produced by
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* save_priv().
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*/
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pub fn load_priv(&mut self, s: &[u8]) {
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self._fromstr(s, libcrypto::d2i_PrivateKey);
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self.parts = Both;
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}
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/**
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* Returns the size of the public key modulus.
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*/
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pub fn size(&self) -> uint {
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unsafe {
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libcrypto::RSA_size(libcrypto::EVP_PKEY_get1_RSA(self.evp)) as uint
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}
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}
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/**
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* Returns whether this pkey object can perform the specified role.
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*/
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pub fn can(&self, r: Role) -> bool {
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match r {
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Encrypt =>
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match self.parts {
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Neither => false,
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_ => true,
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},
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Verify =>
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match self.parts {
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Neither => false,
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_ => true,
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},
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Decrypt =>
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match self.parts {
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Both => true,
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_ => false,
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},
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Sign =>
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match self.parts {
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Both => true,
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_ => false,
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},
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}
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}
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/**
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* Returns the maximum amount of data that can be encrypted by an encrypt()
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* call.
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*/
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pub fn max_data(&self) -> uint {
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unsafe {
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let rsa = libcrypto::EVP_PKEY_get1_RSA(self.evp);
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let len = libcrypto::RSA_size(rsa);
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// 41 comes from RSA_public_encrypt(3) for OAEP
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len as uint - 41u
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}
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}
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/**
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* Encrypts data using OAEP padding, returning the encrypted data. The
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* supplied data must not be larger than max_data().
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*/
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pub fn encrypt(&self, s: &[u8]) -> ~[u8] {
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unsafe {
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let rsa = libcrypto::EVP_PKEY_get1_RSA(self.evp);
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let len = libcrypto::RSA_size(rsa);
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// 41 comes from RSA_public_encrypt(3) for OAEP
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assert!(s.len() < libcrypto::RSA_size(rsa) as uint - 41u);
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let mut r = vec::from_elem(len as uint + 1u, 0u8);
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let rv = do r.as_mut_buf |pr, _len| {
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do s.as_imm_buf |ps, s_len| {
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// XXX: 4 == RSA_PKCS1_OAEP_PADDING
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libcrypto::RSA_public_encrypt(
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s_len as c_uint,
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ps,
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pr,
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rsa, 4 as c_int
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)
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}
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};
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if rv < 0 as c_int {
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~[]
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} else {
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r.truncate(rv as uint);
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r
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}
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}
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}
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/**
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* Decrypts data, expecting OAEP padding, returning the decrypted data.
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*/
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pub fn decrypt(&self, s: &[u8]) -> ~[u8] {
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unsafe {
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let rsa = libcrypto::EVP_PKEY_get1_RSA(self.evp);
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let len = libcrypto::RSA_size(rsa);
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assert!(s.len() as c_uint == libcrypto::RSA_size(rsa));
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let mut r = vec::from_elem(len as uint + 1u, 0u8);
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let rv = do r.as_mut_buf |pr, _len| {
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do s.as_imm_buf |ps, s_len| {
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// XXX: 4 == RSA_PKCS1_OAEP_PADDING
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libcrypto::RSA_private_decrypt(
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s_len as c_uint,
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ps,
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pr,
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rsa,
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4 as c_int
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)
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}
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};
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if rv < 0 as c_int {
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~[]
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} else {
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r.truncate(rv as uint);
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r
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}
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}
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}
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/**
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* Signs data, using OpenSSL's default scheme and sha256. Unlike encrypt(),
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* can process an arbitrary amount of data; returns the signature.
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*/
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pub fn sign(&self, s: &[u8]) -> ~[u8] {
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unsafe {
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let rsa = libcrypto::EVP_PKEY_get1_RSA(self.evp);
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let len = libcrypto::RSA_size(rsa);
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let mut r = vec::from_elem(len as uint + 1u, 0u8);
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let rv = do r.as_mut_buf |pr, _len| {
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do s.as_imm_buf |ps, s_len| {
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let mut len = len;
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// XXX: 672 == NID_sha256
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libcrypto::RSA_sign(
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672 as c_int,
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ps,
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s_len as c_uint,
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pr,
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&mut len,
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rsa)
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}
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};
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if rv < 0 as c_int {
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~[]
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} else {
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r.truncate(len as uint);
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r
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}
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}
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}
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/**
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* Verifies a signature s (using OpenSSL's default scheme and sha256) on a
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* message m. Returns true if the signature is valid, and false otherwise.
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*/
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pub fn verify(&self, m: &[u8], s: &[u8]) -> bool {
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unsafe {
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let rsa = libcrypto::EVP_PKEY_get1_RSA(self.evp);
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do m.as_imm_buf |pm, m_len| {
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do s.as_imm_buf |ps, s_len| {
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// XXX: 672 == NID_sha256
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let rv = libcrypto::RSA_verify(
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672 as c_int,
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pm,
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m_len as c_uint,
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ps,
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s_len as c_uint,
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rsa
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);
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rv == 1 as c_int
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}
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}
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_gen_pub() {
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let mut k0 = PKey();
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let mut k1 = PKey();
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k0.gen(512u);
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k1.load_pub(k0.save_pub());
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assert!(k0.save_pub() == k1.save_pub());
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assert!(k0.size() == k1.size());
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assert!(k0.can(Encrypt));
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assert!(k0.can(Decrypt));
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assert!(k0.can(Verify));
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assert!(k0.can(Sign));
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assert!(k1.can(Encrypt));
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assert!(!k1.can(Decrypt));
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assert!(k1.can(Verify));
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assert!(!k1.can(Sign));
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}
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#[test]
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fn test_gen_priv() {
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let mut k0 = PKey();
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let mut k1 = PKey();
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k0.gen(512u);
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k1.load_priv(k0.save_priv());
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assert!(k0.save_priv() == k1.save_priv());
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assert!(k0.size() == k1.size());
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assert!(k0.can(Encrypt));
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assert!(k0.can(Decrypt));
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assert!(k0.can(Verify));
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assert!(k0.can(Sign));
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assert!(k1.can(Encrypt));
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assert!(k1.can(Decrypt));
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assert!(k1.can(Verify));
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assert!(k1.can(Sign));
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}
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#[test]
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fn test_encrypt() {
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let mut k0 = PKey();
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let mut k1 = PKey();
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let msg = ~[0xdeu8, 0xadu8, 0xd0u8, 0x0du8];
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k0.gen(512u);
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k1.load_pub(k0.save_pub());
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let emsg = k1.encrypt(msg);
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let dmsg = k0.decrypt(emsg);
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assert!(msg == dmsg);
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}
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#[test]
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fn test_sign() {
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let mut k0 = PKey();
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let mut k1 = PKey();
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let msg = ~[0xdeu8, 0xadu8, 0xd0u8, 0x0du8];
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k0.gen(512u);
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k1.load_pub(k0.save_pub());
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let sig = k0.sign(msg);
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let rv = k1.verify(msg, sig);
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assert!(rv == true);
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}
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}
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