EVP support for wrapping algorithms.

[openssl.git] / crypto / modes / wrap128.c

diff --git a/crypto/modes/wrap128.c b/crypto/modes/wrap128.c
new file mode 100644 (file)
index 0000000..1878532
--- /dev/null
+++ b/crypto/modes/wrap128.c
@@ -0,0 +1,140 @@
+/* crypto/modes/wrap128.c */
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project.
+ */
+/* ====================================================================
+ * Copyright (c) 2013 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ */
+
+#include "cryptlib.h"
+#include <openssl/modes.h>
+
+static const unsigned char default_iv[] = {
+  0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6,
+};
+/* Input size limit: lower than maximum of standards but far larger than
+ * anything that will be used in practice.
+ */
+#define CRYPTO128_WRAP_MAX (1UL << 31)
+
+size_t CRYPTO_128_wrap(void *key, const unsigned char *iv,
+               unsigned char *out,
+               const unsigned char *in, size_t inlen, block128_f block)
+       {
+       unsigned char *A, B[16], *R;
+       size_t i, j, t;
+       if ((inlen & 0x7) || (inlen < 8) || (inlen > CRYPTO128_WRAP_MAX))
+               return 0;
+       A = B;
+       t = 1;
+       memcpy(out + 8, in, inlen);
+       if (!iv)
+               iv = default_iv;
+
+       memcpy(A, iv, 8);
+
+       for (j = 0; j < 6; j++)
+               {
+               R = out + 8;
+               for (i = 0; i < inlen; i += 8, t++, R += 8)
+                       {
+                       memcpy(B + 8, R, 8);
+                       block(B, B, key);
+                       A[7] ^= (unsigned char)(t & 0xff);
+                       if (t > 0xff)   
+                               {
+                               A[6] ^= (unsigned char)((t >> 8) & 0xff);
+                               A[5] ^= (unsigned char)((t >> 16) & 0xff);
+                               A[4] ^= (unsigned char)((t >> 24) & 0xff);
+                               }
+                       memcpy(R, B + 8, 8);
+                       }
+               }
+       memcpy(out, A, 8);
+       return inlen + 8;
+       }
+
+size_t CRYPTO_128_unwrap(void *key, const unsigned char *iv,
+               unsigned char *out,
+               const unsigned char *in, size_t inlen, block128_f block)
+       {
+       unsigned char *A, B[16], *R;
+       size_t i, j, t;
+       inlen -= 8;
+       if ((inlen & 0x7) || (inlen < 8) || (inlen > CRYPTO128_WRAP_MAX))
+               return 0;
+       A = B;
+       t =  6 * (inlen >> 3);
+       memcpy(A, in, 8);
+       memcpy(out, in + 8, inlen);
+       for (j = 0; j < 6; j++)
+               {
+               R = out + inlen - 8;
+               for (i = 0; i < inlen; i += 8, t--, R -= 8)
+                       {
+                       A[7] ^= (unsigned char)(t & 0xff);
+                       if (t > 0xff)   
+                               {
+                               A[6] ^= (unsigned char)((t >> 8) & 0xff);
+                               A[5] ^= (unsigned char)((t >> 16) & 0xff);
+                               A[4] ^= (unsigned char)((t >> 24) & 0xff);
+                               }
+                       memcpy(B + 8, R, 8);
+                       block(B, B, key);
+                       memcpy(R, B + 8, 8);
+                       }
+               }
+       if (!iv)
+               iv = default_iv;
+       if (memcmp(A, iv, 8))
+               {
+               OPENSSL_cleanse(out, inlen);
+               return 0;
+               }
+       return inlen;
+       }