879 lines
20 KiB
Rust
879 lines
20 KiB
Rust
//! Message signatures.
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//!
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//! The `Signer` allows for the computation of cryptographic signatures of
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//! data given a private key. The `Verifier` can then be used with the
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//! corresponding public key to verify the integrity and authenticity of that
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//! data given the signature.
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//!
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//! # Examples
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//!
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//! Sign and verify data given an RSA keypair:
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//!
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//! ```rust
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//! use openssl::sign::{Signer, Verifier};
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//! use openssl::rsa::Rsa;
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//! use openssl::pkey::PKey;
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//! use openssl::hash::MessageDigest;
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//!
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//! // Generate a keypair
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//! let keypair = Rsa::generate(2048).unwrap();
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//! let keypair = PKey::from_rsa(keypair).unwrap();
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//!
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//! let data = b"hello, world!";
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//! let data2 = b"hola, mundo!";
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//!
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//! // Sign the data
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//! let mut signer = Signer::new(MessageDigest::sha256(), &keypair).unwrap();
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//! signer.update(data).unwrap();
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//! signer.update(data2).unwrap();
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//! let signature = signer.finish().unwrap();
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//!
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//! // Verify the data
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//! let mut verifier = Verifier::new(MessageDigest::sha256(), &keypair).unwrap();
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//! verifier.update(data).unwrap();
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//! verifier.update(data2).unwrap();
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//! assert!(verifier.finish(&signature).unwrap());
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//! ```
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//!
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//! Compute an HMAC:
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//!
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//! ```rust
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//! use openssl::hash::MessageDigest;
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//! use openssl::memcmp;
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//! use openssl::pkey::PKey;
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//! use openssl::sign::Signer;
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//!
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//! // Create a PKey
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//! let key = PKey::hmac(b"my secret").unwrap();
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//!
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//! let data = b"hello, world!";
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//! let data2 = b"hola, mundo!";
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//!
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//! // Compute the HMAC
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//! let mut signer = Signer::new(MessageDigest::sha256(), &key).unwrap();
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//! signer.update(data).unwrap();
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//! signer.update(data2).unwrap();
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//! let hmac = signer.finish().unwrap();
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//!
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//! // `Verifier` cannot be used with HMACs; use the `memcmp::eq` function instead
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//! //
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//! // Do not simply check for equality with `==`!
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//! # let target = hmac.clone();
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//! assert!(memcmp::eq(&hmac, &target));
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//! ```
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use ffi;
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use foreign_types::ForeignTypeRef;
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use std::io::{self, Write};
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use std::marker::PhantomData;
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use std::ptr;
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use {cvt, cvt_p};
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use hash::MessageDigest;
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use pkey::{PKeyRef, PKeyCtxRef};
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use error::ErrorStack;
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#[cfg(ossl110)]
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use ffi::{EVP_MD_CTX_new, EVP_MD_CTX_free};
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#[cfg(any(ossl101, ossl102))]
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use ffi::{EVP_MD_CTX_create as EVP_MD_CTX_new, EVP_MD_CTX_destroy as EVP_MD_CTX_free};
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pub struct Signer<'a> {
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md_ctx: *mut ffi::EVP_MD_CTX,
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pkey_ctx: *mut ffi::EVP_PKEY_CTX,
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pkey_pd: PhantomData<&'a PKeyRef>,
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}
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impl<'a> Drop for Signer<'a> {
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fn drop(&mut self) {
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// pkey_ctx is owned by the md_ctx, so no need to explicitly free it.
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unsafe {
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EVP_MD_CTX_free(self.md_ctx);
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}
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}
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}
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impl<'a> Signer<'a> {
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pub fn new(type_: MessageDigest, pkey: &'a PKeyRef) -> Result<Signer<'a>, ErrorStack> {
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unsafe {
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ffi::init();
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let ctx = try!(cvt_p(EVP_MD_CTX_new()));
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let mut pctx: *mut ffi::EVP_PKEY_CTX = ptr::null_mut();
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let r = ffi::EVP_DigestSignInit(
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ctx,
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&mut pctx,
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type_.as_ptr(),
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ptr::null_mut(),
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pkey.as_ptr(),
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);
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if r != 1 {
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EVP_MD_CTX_free(ctx);
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return Err(ErrorStack::get());
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}
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assert!(!pctx.is_null());
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Ok(Signer {
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md_ctx: ctx,
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pkey_ctx: pctx,
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pkey_pd: PhantomData,
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})
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}
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}
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pub fn pkey_ctx(&self) -> &PKeyCtxRef {
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unsafe { PKeyCtxRef::from_ptr(self.pkey_ctx) }
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}
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pub fn pkey_ctx_mut(&mut self) -> &mut PKeyCtxRef {
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unsafe { PKeyCtxRef::from_ptr_mut(self.pkey_ctx) }
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}
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pub fn update(&mut self, buf: &[u8]) -> Result<(), ErrorStack> {
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unsafe {
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cvt(ffi::EVP_DigestUpdate(
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self.md_ctx,
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buf.as_ptr() as *const _,
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buf.len(),
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)).map(|_| ())
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}
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}
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pub fn finish(&self) -> Result<Vec<u8>, ErrorStack> {
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unsafe {
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let mut len = 0;
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try!(cvt(ffi::EVP_DigestSignFinal(
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self.md_ctx,
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ptr::null_mut(),
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&mut len,
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)));
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let mut buf = vec![0; len];
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try!(cvt(ffi::EVP_DigestSignFinal(
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self.md_ctx,
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buf.as_mut_ptr() as *mut _,
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&mut len,
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)));
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// The advertised length is not always equal to the real length for things like DSA
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buf.truncate(len);
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Ok(buf)
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}
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}
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}
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impl<'a> Write for Signer<'a> {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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try!(self.update(buf));
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Ok(buf.len())
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}
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fn flush(&mut self) -> io::Result<()> {
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Ok(())
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}
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}
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pub struct Verifier<'a> {
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md_ctx: *mut ffi::EVP_MD_CTX,
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pkey_ctx: *mut ffi::EVP_PKEY_CTX,
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pkey_pd: PhantomData<&'a PKeyRef>,
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}
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impl<'a> Drop for Verifier<'a> {
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fn drop(&mut self) {
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// pkey_ctx is owned by the md_ctx, so no need to explicitly free it.
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unsafe {
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EVP_MD_CTX_free(self.md_ctx);
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}
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}
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}
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impl<'a> Verifier<'a> {
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pub fn new(type_: MessageDigest, pkey: &'a PKeyRef) -> Result<Verifier<'a>, ErrorStack> {
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unsafe {
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ffi::init();
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let ctx = try!(cvt_p(EVP_MD_CTX_new()));
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let mut pctx: *mut ffi::EVP_PKEY_CTX = ptr::null_mut();
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let r = ffi::EVP_DigestVerifyInit(
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ctx,
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&mut pctx,
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type_.as_ptr(),
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ptr::null_mut(),
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pkey.as_ptr(),
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);
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if r != 1 {
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EVP_MD_CTX_free(ctx);
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return Err(ErrorStack::get());
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}
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assert!(!pctx.is_null());
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Ok(Verifier {
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md_ctx: ctx,
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pkey_ctx: pctx,
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pkey_pd: PhantomData,
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})
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}
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}
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pub fn pkey_ctx(&self) -> &PKeyCtxRef {
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unsafe { PKeyCtxRef::from_ptr(self.pkey_ctx) }
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}
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pub fn pkey_ctx_mut(&mut self) -> &mut PKeyCtxRef {
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unsafe { PKeyCtxRef::from_ptr_mut(self.pkey_ctx) }
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}
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pub fn update(&mut self, buf: &[u8]) -> Result<(), ErrorStack> {
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unsafe {
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cvt(ffi::EVP_DigestUpdate(
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self.md_ctx,
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buf.as_ptr() as *const _,
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buf.len(),
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)).map(|_| ())
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}
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}
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pub fn finish(&self, signature: &[u8]) -> Result<bool, ErrorStack> {
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unsafe {
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let r =
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EVP_DigestVerifyFinal(self.md_ctx, signature.as_ptr() as *const _, signature.len());
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match r {
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1 => Ok(true),
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0 => {
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ErrorStack::get(); // discard error stack
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Ok(false)
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}
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_ => Err(ErrorStack::get()),
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}
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}
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}
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}
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impl<'a> Write for Verifier<'a> {
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fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
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try!(self.update(buf));
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Ok(buf.len())
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}
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fn flush(&mut self) -> io::Result<()> {
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Ok(())
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}
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}
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#[cfg(not(ossl101))]
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use ffi::EVP_DigestVerifyFinal;
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#[cfg(ossl101)]
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#[allow(bad_style)]
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unsafe fn EVP_DigestVerifyFinal(
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ctx: *mut ffi::EVP_MD_CTX,
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sigret: *const ::libc::c_uchar,
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siglen: ::libc::size_t,
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) -> ::libc::c_int {
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ffi::EVP_DigestVerifyFinal(ctx, sigret as *mut _, siglen)
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}
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#[cfg(test)]
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mod test {
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use hex::FromHex;
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use std::iter;
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use hash::MessageDigest;
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use sign::{Signer, Verifier};
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use ec::{EcGroup, EcKey};
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use nid;
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use rsa::{Rsa, PKCS1_PADDING};
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use dsa::Dsa;
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use pkey::PKey;
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static INPUT: &'static [u8] = &[
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101,
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121,
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74,
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104,
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98,
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71,
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99,
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105,
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79,
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105,
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74,
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83,
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85,
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122,
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73,
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49,
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78,
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105,
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|
74,
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57,
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|
46,
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101,
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121,
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|
74,
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|
112,
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|
99,
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|
51,
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|
77,
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|
105,
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|
79,
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|
105,
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|
74,
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|
113,
|
|
98,
|
|
50,
|
|
85,
|
|
105,
|
|
76,
|
|
65,
|
|
48,
|
|
75,
|
|
73,
|
|
67,
|
|
74,
|
|
108,
|
|
101,
|
|
72,
|
|
65,
|
|
105,
|
|
79,
|
|
106,
|
|
69,
|
|
122,
|
|
77,
|
|
68,
|
|
65,
|
|
52,
|
|
77,
|
|
84,
|
|
107,
|
|
122,
|
|
79,
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|
68,
|
|
65,
|
|
115,
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|
68,
|
|
81,
|
|
111,
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|
103,
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|
73,
|
|
109,
|
|
104,
|
|
48,
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|
100,
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|
72,
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|
65,
|
|
54,
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|
76,
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|
121,
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|
57,
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|
108,
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|
101,
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|
71,
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|
70,
|
|
116,
|
|
99,
|
|
71,
|
|
120,
|
|
108,
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|
76,
|
|
109,
|
|
78,
|
|
118,
|
|
98,
|
|
83,
|
|
57,
|
|
112,
|
|
99,
|
|
49,
|
|
57,
|
|
121,
|
|
98,
|
|
50,
|
|
57,
|
|
48,
|
|
73,
|
|
106,
|
|
112,
|
|
48,
|
|
99,
|
|
110,
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|
86,
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108,
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102,
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81,
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];
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static SIGNATURE: &'static [u8] = &[
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112,
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46,
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|
33,
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137,
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|
67,
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|
232,
|
|
143,
|
|
209,
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|
30,
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|
181,
|
|
216,
|
|
45,
|
|
191,
|
|
120,
|
|
69,
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|
243,
|
|
65,
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|
6,
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|
174,
|
|
27,
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|
129,
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|
255,
|
|
247,
|
|
115,
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|
17,
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|
22,
|
|
173,
|
|
209,
|
|
113,
|
|
125,
|
|
131,
|
|
101,
|
|
109,
|
|
66,
|
|
10,
|
|
253,
|
|
60,
|
|
150,
|
|
238,
|
|
221,
|
|
115,
|
|
162,
|
|
102,
|
|
62,
|
|
81,
|
|
102,
|
|
104,
|
|
123,
|
|
0,
|
|
11,
|
|
135,
|
|
34,
|
|
110,
|
|
1,
|
|
135,
|
|
237,
|
|
16,
|
|
115,
|
|
249,
|
|
69,
|
|
229,
|
|
130,
|
|
173,
|
|
252,
|
|
239,
|
|
22,
|
|
216,
|
|
90,
|
|
121,
|
|
142,
|
|
232,
|
|
198,
|
|
109,
|
|
219,
|
|
61,
|
|
184,
|
|
151,
|
|
91,
|
|
23,
|
|
208,
|
|
148,
|
|
2,
|
|
190,
|
|
237,
|
|
213,
|
|
217,
|
|
217,
|
|
112,
|
|
7,
|
|
16,
|
|
141,
|
|
178,
|
|
129,
|
|
96,
|
|
213,
|
|
248,
|
|
4,
|
|
12,
|
|
167,
|
|
68,
|
|
87,
|
|
98,
|
|
184,
|
|
31,
|
|
190,
|
|
127,
|
|
249,
|
|
217,
|
|
46,
|
|
10,
|
|
231,
|
|
111,
|
|
36,
|
|
242,
|
|
91,
|
|
51,
|
|
187,
|
|
230,
|
|
244,
|
|
74,
|
|
230,
|
|
30,
|
|
177,
|
|
4,
|
|
10,
|
|
203,
|
|
32,
|
|
4,
|
|
77,
|
|
62,
|
|
249,
|
|
18,
|
|
142,
|
|
212,
|
|
1,
|
|
48,
|
|
121,
|
|
91,
|
|
212,
|
|
189,
|
|
59,
|
|
65,
|
|
238,
|
|
202,
|
|
208,
|
|
102,
|
|
171,
|
|
101,
|
|
25,
|
|
129,
|
|
253,
|
|
228,
|
|
141,
|
|
247,
|
|
127,
|
|
55,
|
|
45,
|
|
195,
|
|
139,
|
|
159,
|
|
175,
|
|
221,
|
|
59,
|
|
239,
|
|
177,
|
|
139,
|
|
93,
|
|
163,
|
|
204,
|
|
60,
|
|
46,
|
|
176,
|
|
47,
|
|
158,
|
|
58,
|
|
65,
|
|
214,
|
|
18,
|
|
202,
|
|
173,
|
|
21,
|
|
145,
|
|
18,
|
|
115,
|
|
160,
|
|
95,
|
|
35,
|
|
185,
|
|
232,
|
|
56,
|
|
250,
|
|
175,
|
|
132,
|
|
157,
|
|
105,
|
|
132,
|
|
41,
|
|
239,
|
|
90,
|
|
30,
|
|
136,
|
|
121,
|
|
130,
|
|
54,
|
|
195,
|
|
212,
|
|
14,
|
|
96,
|
|
69,
|
|
34,
|
|
165,
|
|
68,
|
|
200,
|
|
242,
|
|
122,
|
|
122,
|
|
45,
|
|
184,
|
|
6,
|
|
99,
|
|
209,
|
|
108,
|
|
247,
|
|
202,
|
|
234,
|
|
86,
|
|
222,
|
|
64,
|
|
92,
|
|
178,
|
|
33,
|
|
90,
|
|
69,
|
|
178,
|
|
194,
|
|
85,
|
|
102,
|
|
181,
|
|
90,
|
|
193,
|
|
167,
|
|
72,
|
|
160,
|
|
112,
|
|
223,
|
|
200,
|
|
163,
|
|
42,
|
|
70,
|
|
149,
|
|
67,
|
|
208,
|
|
25,
|
|
238,
|
|
251,
|
|
71,
|
|
];
|
|
|
|
#[test]
|
|
fn rsa_sign() {
|
|
let key = include_bytes!("../test/rsa.pem");
|
|
let private_key = Rsa::private_key_from_pem(key).unwrap();
|
|
let pkey = PKey::from_rsa(private_key).unwrap();
|
|
|
|
let mut signer = Signer::new(MessageDigest::sha256(), &pkey).unwrap();
|
|
assert_eq!(signer.pkey_ctx_mut().rsa_padding().unwrap(), PKCS1_PADDING);
|
|
signer
|
|
.pkey_ctx_mut()
|
|
.set_rsa_padding(PKCS1_PADDING)
|
|
.unwrap();
|
|
signer.update(INPUT).unwrap();
|
|
let result = signer.finish().unwrap();
|
|
|
|
assert_eq!(result, SIGNATURE);
|
|
}
|
|
|
|
#[test]
|
|
fn rsa_verify_ok() {
|
|
let key = include_bytes!("../test/rsa.pem");
|
|
let private_key = Rsa::private_key_from_pem(key).unwrap();
|
|
let pkey = PKey::from_rsa(private_key).unwrap();
|
|
|
|
let mut verifier = Verifier::new(MessageDigest::sha256(), &pkey).unwrap();
|
|
assert_eq!(
|
|
verifier.pkey_ctx_mut().rsa_padding().unwrap(),
|
|
PKCS1_PADDING
|
|
);
|
|
verifier.update(INPUT).unwrap();
|
|
assert!(verifier.finish(SIGNATURE).unwrap());
|
|
}
|
|
|
|
#[test]
|
|
fn rsa_verify_invalid() {
|
|
let key = include_bytes!("../test/rsa.pem");
|
|
let private_key = Rsa::private_key_from_pem(key).unwrap();
|
|
let pkey = PKey::from_rsa(private_key).unwrap();
|
|
|
|
let mut verifier = Verifier::new(MessageDigest::sha256(), &pkey).unwrap();
|
|
verifier.update(INPUT).unwrap();
|
|
verifier.update(b"foobar").unwrap();
|
|
assert!(!verifier.finish(SIGNATURE).unwrap());
|
|
}
|
|
|
|
#[test]
|
|
pub fn dsa_sign_verify() {
|
|
let input: Vec<u8> = (0..25).cycle().take(1024).collect();
|
|
|
|
let private_key = {
|
|
let key = include_bytes!("../test/dsa.pem");
|
|
PKey::from_dsa(Dsa::private_key_from_pem(key).unwrap()).unwrap()
|
|
};
|
|
|
|
let public_key = {
|
|
let key = include_bytes!("../test/dsa.pem.pub");
|
|
PKey::from_dsa(Dsa::public_key_from_pem(key).unwrap()).unwrap()
|
|
};
|
|
|
|
let mut signer = Signer::new(MessageDigest::sha1(), &private_key).unwrap();
|
|
signer.update(&input).unwrap();
|
|
let sig = signer.finish().unwrap();
|
|
|
|
let mut verifier = Verifier::new(MessageDigest::sha1(), &public_key).unwrap();
|
|
verifier.update(&input).unwrap();
|
|
assert!(verifier.finish(&sig).unwrap());
|
|
}
|
|
|
|
#[test]
|
|
pub fn dsa_sign_verify_fail() {
|
|
let input: Vec<u8> = (0..25).cycle().take(1024).collect();
|
|
|
|
let private_key = {
|
|
let key = include_bytes!("../test/dsa.pem");
|
|
PKey::from_dsa(Dsa::private_key_from_pem(key).unwrap()).unwrap()
|
|
};
|
|
|
|
let public_key = {
|
|
let key = include_bytes!("../test/dsa.pem.pub");
|
|
PKey::from_dsa(Dsa::public_key_from_pem(key).unwrap()).unwrap()
|
|
};
|
|
|
|
let mut signer = Signer::new(MessageDigest::sha1(), &private_key).unwrap();
|
|
signer.update(&input).unwrap();
|
|
let mut sig = signer.finish().unwrap();
|
|
sig[0] -= 1;
|
|
|
|
let mut verifier = Verifier::new(MessageDigest::sha1(), &public_key).unwrap();
|
|
verifier.update(&input).unwrap();
|
|
match verifier.finish(&sig) {
|
|
Ok(true) => panic!("unexpected success"),
|
|
Ok(false) | Err(_) => {}
|
|
}
|
|
}
|
|
|
|
fn test_hmac(ty: MessageDigest, tests: &[(Vec<u8>, Vec<u8>, Vec<u8>)]) {
|
|
for &(ref key, ref data, ref res) in tests.iter() {
|
|
let pkey = PKey::hmac(key).unwrap();
|
|
let mut signer = Signer::new(ty, &pkey).unwrap();
|
|
signer.update(data).unwrap();
|
|
assert_eq!(signer.finish().unwrap(), *res);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn hmac_md5() {
|
|
// test vectors from RFC 2202
|
|
let tests: [(Vec<u8>, Vec<u8>, Vec<u8>); 7] =
|
|
[
|
|
(
|
|
iter::repeat(0x0b_u8).take(16).collect(),
|
|
b"Hi There".to_vec(),
|
|
Vec::from_hex("9294727a3638bb1c13f48ef8158bfc9d").unwrap(),
|
|
),
|
|
(
|
|
b"Jefe".to_vec(),
|
|
b"what do ya want for nothing?".to_vec(),
|
|
Vec::from_hex("750c783e6ab0b503eaa86e310a5db738").unwrap(),
|
|
),
|
|
(
|
|
iter::repeat(0xaa_u8).take(16).collect(),
|
|
iter::repeat(0xdd_u8).take(50).collect(),
|
|
Vec::from_hex("56be34521d144c88dbb8c733f0e8b3f6").unwrap(),
|
|
),
|
|
(
|
|
Vec::from_hex("0102030405060708090a0b0c0d0e0f10111213141516171819").unwrap(),
|
|
iter::repeat(0xcd_u8).take(50).collect(),
|
|
Vec::from_hex("697eaf0aca3a3aea3a75164746ffaa79").unwrap(),
|
|
),
|
|
(
|
|
iter::repeat(0x0c_u8).take(16).collect(),
|
|
b"Test With Truncation".to_vec(),
|
|
Vec::from_hex("56461ef2342edc00f9bab995690efd4c").unwrap(),
|
|
),
|
|
(
|
|
iter::repeat(0xaa_u8).take(80).collect(),
|
|
b"Test Using Larger Than Block-Size Key - Hash Key First".to_vec(),
|
|
Vec::from_hex("6b1ab7fe4bd7bf8f0b62e6ce61b9d0cd").unwrap(),
|
|
),
|
|
(
|
|
iter::repeat(0xaa_u8).take(80).collect(),
|
|
b"Test Using Larger Than Block-Size Key \
|
|
and Larger Than One Block-Size Data"
|
|
.to_vec(),
|
|
Vec::from_hex("6f630fad67cda0ee1fb1f562db3aa53e").unwrap(),
|
|
),
|
|
];
|
|
|
|
test_hmac(MessageDigest::md5(), &tests);
|
|
}
|
|
|
|
#[test]
|
|
fn hmac_sha1() {
|
|
// test vectors from RFC 2202
|
|
let tests: [(Vec<u8>, Vec<u8>, Vec<u8>); 7] =
|
|
[
|
|
(
|
|
iter::repeat(0x0b_u8).take(20).collect(),
|
|
b"Hi There".to_vec(),
|
|
Vec::from_hex("b617318655057264e28bc0b6fb378c8ef146be00").unwrap(),
|
|
),
|
|
(
|
|
b"Jefe".to_vec(),
|
|
b"what do ya want for nothing?".to_vec(),
|
|
Vec::from_hex("effcdf6ae5eb2fa2d27416d5f184df9c259a7c79").unwrap(),
|
|
),
|
|
(
|
|
iter::repeat(0xaa_u8).take(20).collect(),
|
|
iter::repeat(0xdd_u8).take(50).collect(),
|
|
Vec::from_hex("125d7342b9ac11cd91a39af48aa17b4f63f175d3").unwrap(),
|
|
),
|
|
(
|
|
Vec::from_hex("0102030405060708090a0b0c0d0e0f10111213141516171819").unwrap(),
|
|
iter::repeat(0xcd_u8).take(50).collect(),
|
|
Vec::from_hex("4c9007f4026250c6bc8414f9bf50c86c2d7235da").unwrap(),
|
|
),
|
|
(
|
|
iter::repeat(0x0c_u8).take(20).collect(),
|
|
b"Test With Truncation".to_vec(),
|
|
Vec::from_hex("4c1a03424b55e07fe7f27be1d58bb9324a9a5a04").unwrap(),
|
|
),
|
|
(
|
|
iter::repeat(0xaa_u8).take(80).collect(),
|
|
b"Test Using Larger Than Block-Size Key - Hash Key First".to_vec(),
|
|
Vec::from_hex("aa4ae5e15272d00e95705637ce8a3b55ed402112").unwrap(),
|
|
),
|
|
(
|
|
iter::repeat(0xaa_u8).take(80).collect(),
|
|
b"Test Using Larger Than Block-Size Key \
|
|
and Larger Than One Block-Size Data"
|
|
.to_vec(),
|
|
Vec::from_hex("e8e99d0f45237d786d6bbaa7965c7808bbff1a91").unwrap(),
|
|
),
|
|
];
|
|
|
|
test_hmac(MessageDigest::sha1(), &tests);
|
|
}
|
|
|
|
#[test]
|
|
fn ec() {
|
|
let group = EcGroup::from_curve_name(nid::X9_62_PRIME256V1).unwrap();
|
|
let key = EcKey::generate(&group).unwrap();
|
|
let key = PKey::from_ec_key(key).unwrap();
|
|
|
|
let mut signer = Signer::new(MessageDigest::sha256(), &key).unwrap();
|
|
signer.update(b"hello world").unwrap();
|
|
let signature = signer.finish().unwrap();
|
|
|
|
let mut verifier = Verifier::new(MessageDigest::sha256(), &key).unwrap();
|
|
verifier.update(b"hello world").unwrap();
|
|
assert!(verifier.finish(&signature).unwrap());
|
|
}
|
|
}
|