From fccb2eab4e39726fcfd2af79f20c872f488a14b3 Mon Sep 17 00:00:00 2001
From: "pe@pijul.org" <pe@pijul.org>
Date: Sat, 2 Dec 2017 12:30:50 +0100
Subject: [PATCH] Adding dp(), dq() and qi() methods to RSA, to get the CRT
 parameters back

---
 openssl-sys/src/ossl110.rs |  6 ++++++
 openssl/src/rsa.rs         | 43 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/openssl-sys/src/ossl110.rs b/openssl-sys/src/ossl110.rs
index ff1e0c7ca..8cd9a2e19 100644
--- a/openssl-sys/src/ossl110.rs
+++ b/openssl-sys/src/ossl110.rs
@@ -172,6 +172,12 @@ extern "C" {
         d: *mut *const ::BIGNUM,
     );
     pub fn RSA_get0_factors(r: *const ::RSA, p: *mut *const ::BIGNUM, q: *mut *const ::BIGNUM);
+    pub fn RSA_get0_crt_params(
+        r: *const ::RSA,
+        dmp1: *mut *const ::BIGNUM,
+        dmq1: *mut *const ::BIGNUM,
+        iqmp: *mut *const ::BIGNUM,
+    ) -> c_int;
     pub fn RSA_set0_key(
         r: *mut ::RSA,
         n: *mut ::BIGNUM,
diff --git a/openssl/src/rsa.rs b/openssl/src/rsa.rs
index 3f4e80147..b02b92168 100644
--- a/openssl/src/rsa.rs
+++ b/openssl/src/rsa.rs
@@ -222,6 +222,39 @@ impl RsaRef {
             }
         }
     }
+
+    pub fn dp(&self) -> Option<&BigNumRef> {
+        unsafe {
+            let dp = compat::crt_params(self.as_ptr())[0];
+            if dp.is_null() {
+                None
+            } else {
+                Some(BigNumRef::from_ptr(dp as *mut _))
+            }
+        }
+    }
+
+    pub fn dq(&self) -> Option<&BigNumRef> {
+        unsafe {
+            let dq = compat::crt_params(self.as_ptr())[1];
+            if dq.is_null() {
+                None
+            } else {
+                Some(BigNumRef::from_ptr(dq as *mut _))
+            }
+        }
+    }
+
+    pub fn qi(&self) -> Option<&BigNumRef> {
+        unsafe {
+            let qi = compat::crt_params(self.as_ptr())[2];
+            if qi.is_null() {
+                None
+            } else {
+                Some(BigNumRef::from_ptr(qi as *mut _))
+            }
+        }
+    }
 }
 
 impl Rsa {
@@ -348,6 +381,12 @@ mod compat {
         [p, q]
     }
 
+    pub unsafe fn crt_params(r: *const RSA) -> [*const BIGNUM; 3] {
+        let (mut dp, mut dq, mut qi) = (ptr::null(), ptr::null(), ptr::null());
+        ffi::RSA_get0_crt_params(r, &mut dp, &mut dq, &mut qi);
+        [dp, dq, qi]
+    }
+
     pub unsafe fn set_key(r: *mut RSA, n: *mut BIGNUM, e: *mut BIGNUM, d: *mut BIGNUM) -> c_int {
         ffi::RSA_set0_key(r, n, e, d)
     }
@@ -379,6 +418,10 @@ mod compat {
         [(*r).p, (*r).q]
     }
 
+    pub unsafe fn crt_params(r: *const RSA) -> [*const BIGNUM; 3] {
+        [(*r).dmp1, (*r).dmq1, (*r).iqmp]
+    }
+
     pub unsafe fn set_key(r: *mut RSA, n: *mut BIGNUM, e: *mut BIGNUM, d: *mut BIGNUM) -> c_int {
         (*r).n = n;
         (*r).e = e;
-- 
GitLab