Make sure strdup() is properly declared.

[oweals/openssl.git] / crypto / rsa / rsa_oaep.c

diff --git a/crypto/rsa/rsa_oaep.c b/crypto/rsa/rsa_oaep.c
index fd0b7f361fbba41e833d4416ecb132811366414c..e3d81a7a37916c410e8123e49609b1579615ff42 100644 (file)
--- a/crypto/rsa/rsa_oaep.c
+++ b/crypto/rsa/rsa_oaep.c
@@ -2,9 +2,24 @@
 /* Written by Ulf Moeller. This software is distributed on an "AS IS"
    basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. */
 
-/* EME_OAEP as defined in RFC 2437 (PKCS #1 v2.0) */
-
-#if !defined(NO_SHA) && !defined(NO_SHA1)
+/* EME-OAEP as defined in RFC 2437 (PKCS #1 v2.0) */
+
+/* See Victor Shoup, "OAEP reconsidered," Nov. 2000,
+ * <URL: http://www.shoup.net/papers/oaep.ps.Z>
+ * for problems with the security proof for the
+ * original OAEP scheme, which EME-OAEP is based on.
+ * 
+ * A new proof can be found in E. Fujisaki, T. Okamoto,
+ * D. Pointcheval, J. Stern, "RSA-OEAP is Still Alive!",
+ * Dec. 2000, <URL: http://eprint.iacr.org/2000/061/>.
+ * The new proof has stronger requirements for the
+ * underlying permutation: "partial-one-wayness" instead
+ * of one-wayness.  For the RSA function, this is
+ * an equivalent notion.
+ */
+
+
+#if !defined(OPENSSL_NO_SHA) && !defined(OPENSSL_NO_SHA1)
 #include <stdio.h>
 #include "cryptlib.h"
 #include <openssl/bn.h>
@@ -12,10 +27,12 @@
 #include <openssl/sha.h>
 #include <openssl/rand.h>
 
-int MGF1(unsigned char *mask, long len, unsigned char *seed, long seedlen);
+int MGF1(unsigned char *mask, long len,
+       const unsigned char *seed, long seedlen);
 
 int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
-            unsigned char *from, int flen, unsigned char *param, int plen)
+       const unsigned char *from, int flen,
+       const unsigned char *param, int plen)
     {
     int i, emlen = tlen - 1;
     unsigned char *db, *seed;
@@ -71,11 +88,11 @@ int RSA_padding_add_PKCS1_OAEP(unsigned char *to, int tlen,
     }
 
 int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
-            unsigned char *from, int flen, int num, unsigned char *param,
-            int plen)
+       const unsigned char *from, int flen, int num,
+       const unsigned char *param, int plen)
     {
     int i, dblen, mlen = -1;
-    unsigned char *maskeddb;
+    const unsigned char *maskeddb;
     int lzero;
     unsigned char *db, seed[SHA_DIGEST_LENGTH], phash[SHA_DIGEST_LENGTH];
 
@@ -132,7 +149,8 @@ int RSA_padding_check_PKCS1_OAEP(unsigned char *to, int tlen,
     return (mlen);
     }
 
-int MGF1(unsigned char *mask, long len, unsigned char *seed, long seedlen)
+int MGF1(unsigned char *mask, long len,
+       const unsigned char *seed, long seedlen)
     {
     long i, outlen = 0;
     unsigned char cnt[4];