diff -Naur boinc_core_release_6_4_5/lib/crypt.cpp boinc_core_release_6_4_5p/lib/crypt.cpp
--- boinc_core_release_6_4_5/lib/crypt.cpp	2009-02-07 10:15:12.000000000 +0100
+++ boinc_core_release_6_4_5p/lib/crypt.cpp	2009-02-09 01:12:00.000000000 +0100
@@ -243,7 +243,7 @@
 // The output block must be decrypted in its entirety.
 //
 int encrypt_private(R_RSA_PRIVATE_KEY& key, DATA_BLOCK& in, DATA_BLOCK& out) {
-    int n, modulus_len;
+    int n, modulus_len, retval;
 
     modulus_len = (key.bits+7)/8;
     n = in.len;
@@ -253,15 +253,25 @@
     RSA* rp = RSA_new();
     private_to_openssl(key, rp);
     RSA_private_encrypt(n, in.data, out.data, rp, RSA_PKCS1_PADDING);
+    retval = RSA_private_encrypt(n, in.data, out.data, rp, RSA_PKCS1_PADDING);  
+    if (retval < 0) {   
+    RSA_free(rp);   
+    return ERR_CRYPTO;   
+    }    
     out.len = RSA_size(rp);
     RSA_free(rp);
     return 0;
 }
 
 int decrypt_public(R_RSA_PUBLIC_KEY& key, DATA_BLOCK& in, DATA_BLOCK& out) {
+    int retval;
     RSA* rp = RSA_new();
     public_to_openssl(key, rp);
-    RSA_public_decrypt(in.len, in.data, out.data, rp, RSA_PKCS1_PADDING);
+    retval = RSA_public_decrypt(in.len, in.data, out.data, rp, RSA_PKCS1_PADDING);  
+    if (retval < 0) {   
+    RSA_free(rp);   
+    return ERR_CRYPTO;   
+    }   
     out.len = RSA_size(rp);
     return 0;
 }
diff -Naur boinc_core_release_6_4_5/lib/error_numbers.h boinc_core_release_6_4_5p/lib/error_numbers.h
--- boinc_core_release_6_4_5/lib/error_numbers.h	2009-02-07 10:15:12.000000000 +0100
+++ boinc_core_release_6_4_5p/lib/error_numbers.h	2009-02-09 01:12:58.000000000 +0100
@@ -185,7 +185,7 @@
 #define ERR_RMDIR           -227
 #define ERR_SYMLINK         -229
 #define ERR_DB_CONN_LOST    -230
-
+#define ERR_CRYPTO           -231 
 // PLEASE: add a text description of your error to 
 // the text description function boincerror() in str_util.C.
 
diff -Naur boinc_core_release_6_4_5/lib/str_util.cpp boinc_core_release_6_4_5p/lib/str_util.cpp
--- boinc_core_release_6_4_5/lib/str_util.cpp	2009-02-07 10:15:12.000000000 +0100
+++ boinc_core_release_6_4_5p/lib/str_util.cpp	2009-02-09 01:14:02.000000000 +0100
@@ -735,7 +735,8 @@
         case ERR_RMDIR: return "rmdir() failed";
         case ERR_SYMLINK: return "symlink() failed";
         case ERR_DB_CONN_LOST: return "DB connection lost during enumeration";
-        case 404: return "HTTP file not found";
+        case ERR_CRYPTO: return "encryption error";
+	case 404: return "HTTP file not found";
         case 407: return "HTTP proxy authentication failure";
         case 416: return "HTTP range request error";
         case 500: return "HTTP internal server error";