Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / ipxe / src / crypto / aes_wrap.c

diff --git a/qemu/roms/ipxe/src/crypto/aes_wrap.c b/qemu/roms/ipxe/src/crypto/aes_wrap.c
new file mode 100644 (file)
index 0000000..c09480e
--- /dev/null
+++ b/qemu/roms/ipxe/src/crypto/aes_wrap.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2009 Joshua Oreman <oremanj@rwcr.net>.
+ *
+ * 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 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdlib.h>
+#include <string.h>
+#include <ipxe/crypto.h>
+#include <ipxe/aes.h>
+
+/**
+ * Wrap a key or other data using AES Key Wrap (RFC 3394)
+ *
+ * @v kek      Key Encryption Key, 16 bytes
+ * @v src      Data to encrypt
+ * @v nblk     Number of 8-byte blocks in @a data
+ * @ret dest   Encrypted data (8 bytes longer than input)
+ *
+ * The algorithm is implemented such that @a src and @a dest may point
+ * to the same buffer.
+ */
+int aes_wrap ( const void *kek, const void *src, void *dest, int nblk )
+{
+       u8 *A = dest;
+       u8 B[16];
+       u8 *R;
+       int i, j;
+       void *aes_ctx = malloc ( AES_CTX_SIZE );
+
+       if ( ! aes_ctx )
+               return -1;
+
+       cipher_setkey ( &aes_algorithm, aes_ctx, kek, 16 );
+
+       /* Set up */
+       memset ( A, 0xA6, 8 );
+       memmove ( dest + 8, src, nblk * 8 );
+
+       /* Wrap */
+       for ( j = 0; j < 6; j++ ) {
+               R = dest + 8;
+               for ( i = 1; i <= nblk; i++ ) {
+                       memcpy ( B, A, 8 );
+                       memcpy ( B + 8, R, 8 );
+                       cipher_encrypt ( &aes_algorithm, aes_ctx, B, B, 16 );
+                       memcpy ( A, B, 8 );
+                       A[7] ^= ( nblk * j ) + i;
+                       memcpy ( R, B + 8, 8 );
+                       R += 8;
+               }
+       }
+
+       free ( aes_ctx );
+       return 0;
+}
+
+/**
+ * Unwrap a key or other data using AES Key Wrap (RFC 3394)
+ *
+ * @v kek      Key Encryption Key, 16 bytes
+ * @v src      Data to decrypt
+ * @v nblk     Number of 8-byte blocks in @e plaintext key
+ * @ret dest   Decrypted data (8 bytes shorter than input)
+ * @ret rc     Zero on success, nonzero on IV mismatch
+ *
+ * The algorithm is implemented such that @a src and @a dest may point
+ * to the same buffer.
+ */
+int aes_unwrap ( const void *kek, const void *src, void *dest, int nblk )
+{
+       u8 A[8], B[16];
+       u8 *R;
+       int i, j;
+       void *aes_ctx = malloc ( AES_CTX_SIZE );
+
+       if ( ! aes_ctx )
+               return -1;
+
+       cipher_setkey ( &aes_algorithm, aes_ctx, kek, 16 );
+
+       /* Set up */
+       memcpy ( A, src, 8 );
+       memmove ( dest, src + 8, nblk * 8 );
+
+       /* Unwrap */
+       for ( j = 5; j >= 0; j-- ) {
+               R = dest + ( nblk - 1 ) * 8;
+               for ( i = nblk; i >= 1; i-- ) {
+                       memcpy ( B, A, 8 );
+                       memcpy ( B + 8, R, 8 );
+                       B[7] ^= ( nblk * j ) + i;
+                       cipher_decrypt ( &aes_algorithm, aes_ctx, B, B, 16 );
+                       memcpy ( A, B, 8 );
+                       memcpy ( R, B + 8, 8 );
+                       R -= 8;
+               }
+       }
+
+       free ( aes_ctx );
+
+       /* Check IV */
+       for ( i = 0; i < 8; i++ ) {
+               if ( A[i] != 0xA6 )
+                       return -1;
+       }
+
+       return 0;
+}