audiod.c: Don't log to /dev/null.

[paraslash.git] / crypt.c

diff --git a/crypt.c b/crypt.c
index 34eeb407ed6a33a2487e449dcb87b297b89c6e85..a19b5ac31f98331ea136c9a8d8bebcadcd006ee4 100644 (file)
--- a/crypt.c
+++ b/crypt.c
@@ -1,32 +1,15 @@
 /*
- * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.org>
  *
- *     This program is free software; you can redistribute it and/or modify
- *     it under the terms of the GNU General Public License as published by
- *     the Free Software Foundation; either version 2 of the License, or
- *     (at your option) any later version.
- *
- *     This program is distributed in the hope that it will be useful,
- *     but WITHOUT ANY WARRANTY; without even the implied warranty of
- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *     GNU General Public License for more details.
- *
- *     You should have received a copy of the GNU General Public License
- *     along with this program; if not, write to the Free Software
- *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
  */
 
 /** \file crypt.c openssl-based RSA encryption/decryption routines */
 
-#include <openssl/pem.h>
 #include "para.h"
 #include "error.h"
 #include "string.h"
-
-/** \cond used to distinguish between loading of private/public key */
-#define LOAD_PUBLIC_KEY 0
-#define LOAD_PRIVATE_KEY 1
-/** \endcond **/
+#include "crypt.h"
 
 static EVP_PKEY *load_key(const char *file, int private)
 {
@@ -46,13 +29,24 @@ static EVP_PKEY *load_key(const char *file, int private)
        return pkey;
 }
 
-
+/**
+ * read an RSA key from a file
+ *
+ * \param key_file the file containing the key
+ * \param rsa RSA structure is returned here
+ * \param private if non-zero, read the private key, otherwise the public key
+ *
+ * \return The size of the RSA key on success, negative on errors.
+ *
+ * \sa openssl(1), rsa(1).
+ */
 int get_rsa_key(char *key_file, RSA **rsa, int private)
 {
        EVP_PKEY *key = load_key(key_file, private);
 
        if (!key)
-               return (private == LOAD_PRIVATE_KEY)? -E_PRIVATE_KEY : -E_PUBLIC_KEY;
+               return (private == LOAD_PRIVATE_KEY)? -E_PRIVATE_KEY
+                       : -E_PUBLIC_KEY;
        *rsa = EVP_PKEY_get1_RSA(key);
        EVP_PKEY_free(key);
        if (!*rsa)
@@ -60,6 +54,19 @@ int get_rsa_key(char *key_file, RSA **rsa, int private)
        return RSA_size(*rsa);
 }
 
+/**
+ * free an RSA structure
+ *
+ * \param rsa pointer to the RSA struct to free
+ *
+ * This must be called for any key obtained by get_rsa_key().
+ */
+void rsa_free(RSA *rsa)
+{
+       if (rsa)
+               RSA_free(rsa);
+}
+
 /**
  * decrypt a buffer using an RSA key
  *
@@ -75,14 +82,18 @@ int get_rsa_key(char *key_file, RSA **rsa, int private)
  * \sa RSA_private_decrypt(3)
  **/
 int para_decrypt_buffer(char *key_file, unsigned char *outbuf, unsigned char *inbuf,
-                       int rsa_inlen)
+                       unsigned rsa_inlen)
 {
        RSA *rsa;
-       int ret = get_rsa_key(key_file, &rsa, LOAD_PRIVATE_KEY);
+       int ret, inlen = rsa_inlen;
 
+       if (inlen < 0)
+               return -E_RSA;
+       ret = get_rsa_key(key_file, &rsa, LOAD_PRIVATE_KEY);
        if (ret < 0)
                return ret;
-       ret = RSA_private_decrypt(rsa_inlen, inbuf, outbuf, rsa, RSA_PKCS1_PADDING);
+       ret = RSA_private_decrypt(inlen, inbuf, outbuf, rsa, RSA_PKCS1_PADDING);
+       rsa_free(rsa);
        return (ret > 0)? ret : -E_DECRYPT;
 }
 
@@ -99,7 +110,7 @@ int para_decrypt_buffer(char *key_file, unsigned char *outbuf, unsigned char *in
  * \sa para_decrypt_buffer()
  */
 int para_decrypt_challenge(char *key_file, long unsigned *challenge_nr,
-               unsigned char *inbuf, int rsa_inlen)
+               unsigned char *inbuf, unsigned rsa_inlen)
 {
        unsigned char *rsa_out = OPENSSL_malloc(rsa_inlen + 1);
        int ret = para_decrypt_buffer(key_file, rsa_out, inbuf, rsa_inlen);
@@ -126,10 +137,13 @@ int para_decrypt_challenge(char *key_file, long unsigned *challenge_nr,
  * \sa RSA_public_encrypt(3)
  */
 int para_encrypt_buffer(RSA *rsa, unsigned char *inbuf,
-               const unsigned len, unsigned char *outbuf)
+               unsigned len, unsigned char *outbuf)
 {
-       int ret = RSA_public_encrypt(len, inbuf, outbuf, rsa,
-               RSA_PKCS1_PADDING);
+       int ret, flen = len; /* RSA_public_encrypt expects a signed int */
+
+       if (flen < 0)
+               return -E_ENCRYPT;
+       ret = RSA_public_encrypt(flen, inbuf, outbuf, rsa, RSA_PKCS1_PADDING);
        return ret < 0?  -E_ENCRYPT : ret;
 }