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+/* crypto/aes/aes_ige.c -*- mode:C; c-file-style: "eay" -*- */
+/* ====================================================================
+ * Copyright (c) 2006 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
+ * openssl-core@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/aes.h>
+#include "aes_locl.h"
+
+#define N_WORDS (AES_BLOCK_SIZE / sizeof(unsigned long))
+typedef struct {
+ unsigned long data[N_WORDS];
+} aes_block_t;
+
+/* XXX: probably some better way to do this */
+#if defined(__i386__) || defined(__x86_64__)
+#define UNALIGNED_MEMOPS_ARE_FAST 1
+#else
+#define UNALIGNED_MEMOPS_ARE_FAST 0
+#endif
+
+#if UNALIGNED_MEMOPS_ARE_FAST
+#define load_block(d, s) (d) = *(const aes_block_t *)(s)
+#define store_block(d, s) *(aes_block_t *)(d) = (s)
+#else
+#define load_block(d, s) memcpy((d).data, (s), AES_BLOCK_SIZE)
+#define store_block(d, s) memcpy((d), (s).data, AES_BLOCK_SIZE)
+#endif
+
+/* N.B. The IV for this mode is _twice_ the block size */
+
+void AES_ige_encrypt(const unsigned char *in, unsigned char *out,
+ size_t length, const AES_KEY *key,
+ unsigned char *ivec, const int enc)
+ {
+ size_t n;
+ size_t len = length;
+
+ OPENSSL_assert(in && out && key && ivec);
+ OPENSSL_assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
+ OPENSSL_assert((length%AES_BLOCK_SIZE) == 0);
+
+ len = length / AES_BLOCK_SIZE;
+
+ if (AES_ENCRYPT == enc)
+ {
+ if (in != out &&
+ (UNALIGNED_MEMOPS_ARE_FAST || ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(long)==0))
+ {
+ aes_block_t *ivp = (aes_block_t *)ivec;
+ aes_block_t *iv2p = (aes_block_t *)(ivec + AES_BLOCK_SIZE);
+
+ while (len)
+ {
+ aes_block_t *inp = (aes_block_t *)in;
+ aes_block_t *outp = (aes_block_t *)out;
+
+ for(n=0 ; n < N_WORDS; ++n)
+ outp->data[n] = inp->data[n] ^ ivp->data[n];
+ AES_encrypt((unsigned char *)outp->data, (unsigned char *)outp->data, key);
+ for(n=0 ; n < N_WORDS; ++n)
+ outp->data[n] ^= iv2p->data[n];
+ ivp = outp;
+ iv2p = inp;
+ --len;
+ in += AES_BLOCK_SIZE;
+ out += AES_BLOCK_SIZE;
+ }
+ memcpy(ivec, ivp->data, AES_BLOCK_SIZE);
+ memcpy(ivec + AES_BLOCK_SIZE, iv2p->data, AES_BLOCK_SIZE);
+ }
+ else
+ {
+ aes_block_t tmp, tmp2;
+ aes_block_t iv;
+ aes_block_t iv2;
+
+ load_block(iv, ivec);
+ load_block(iv2, ivec + AES_BLOCK_SIZE);
+
+ while (len)
+ {
+ load_block(tmp, in);
+ for(n=0 ; n < N_WORDS; ++n)
+ tmp2.data[n] = tmp.data[n] ^ iv.data[n];
+ AES_encrypt((unsigned char *)tmp2.data, (unsigned char *)tmp2.data, key);
+ for(n=0 ; n < N_WORDS; ++n)
+ tmp2.data[n] ^= iv2.data[n];
+ store_block(out, tmp2);
+ iv = tmp2;
+ iv2 = tmp;
+ --len;
+ in += AES_BLOCK_SIZE;
+ out += AES_BLOCK_SIZE;
+ }
+ memcpy(ivec, iv.data, AES_BLOCK_SIZE);
+ memcpy(ivec + AES_BLOCK_SIZE, iv2.data, AES_BLOCK_SIZE);
+ }
+ }
+ else
+ {
+ if (in != out &&
+ (UNALIGNED_MEMOPS_ARE_FAST || ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(long)==0))
+ {
+ aes_block_t *ivp = (aes_block_t *)ivec;
+ aes_block_t *iv2p = (aes_block_t *)(ivec + AES_BLOCK_SIZE);
+
+ while (len)
+ {
+ aes_block_t tmp;
+ aes_block_t *inp = (aes_block_t *)in;
+ aes_block_t *outp = (aes_block_t *)out;
+
+ for(n=0 ; n < N_WORDS; ++n)
+ tmp.data[n] = inp->data[n] ^ iv2p->data[n];
+ AES_decrypt((unsigned char *)tmp.data, (unsigned char *)outp->data, key);
+ for(n=0 ; n < N_WORDS; ++n)
+ outp->data[n] ^= ivp->data[n];
+ ivp = inp;
+ iv2p = outp;
+ --len;
+ in += AES_BLOCK_SIZE;
+ out += AES_BLOCK_SIZE;
+ }
+ memcpy(ivec, ivp->data, AES_BLOCK_SIZE);
+ memcpy(ivec + AES_BLOCK_SIZE, iv2p->data, AES_BLOCK_SIZE);
+ }
+ else
+ {
+ aes_block_t tmp, tmp2;
+ aes_block_t iv;
+ aes_block_t iv2;
+
+ load_block(iv, ivec);
+ load_block(iv2, ivec + AES_BLOCK_SIZE);
+
+ while (len)
+ {
+ load_block(tmp, in);
+ tmp2 = tmp;
+ for(n=0 ; n < N_WORDS; ++n)
+ tmp.data[n] ^= iv2.data[n];
+ AES_decrypt((unsigned char *)tmp.data, (unsigned char *)tmp.data, key);
+ for(n=0 ; n < N_WORDS; ++n)
+ tmp.data[n] ^= iv.data[n];
+ store_block(out, tmp);
+ iv = tmp2;
+ iv2 = tmp;
+ --len;
+ in += AES_BLOCK_SIZE;
+ out += AES_BLOCK_SIZE;
+ }
+ memcpy(ivec, iv.data, AES_BLOCK_SIZE);
+ memcpy(ivec + AES_BLOCK_SIZE, iv2.data, AES_BLOCK_SIZE);
+ }
+ }
+ }
+
+/*
+ * Note that its effectively impossible to do biIGE in anything other
+ * than a single pass, so no provision is made for chaining.
+ */
+
+/* N.B. The IV for this mode is _four times_ the block size */
+
+void AES_bi_ige_encrypt(const unsigned char *in, unsigned char *out,
+ size_t length, const AES_KEY *key,
+ const AES_KEY *key2, const unsigned char *ivec,
+ const int enc)
+ {
+ size_t n;
+ size_t len = length;
+ unsigned char tmp[AES_BLOCK_SIZE];
+ unsigned char tmp2[AES_BLOCK_SIZE];
+ unsigned char tmp3[AES_BLOCK_SIZE];
+ unsigned char prev[AES_BLOCK_SIZE];
+ const unsigned char *iv;
+ const unsigned char *iv2;
+
+ OPENSSL_assert(in && out && key && ivec);
+ OPENSSL_assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc));
+ OPENSSL_assert((length%AES_BLOCK_SIZE) == 0);
+
+ if (AES_ENCRYPT == enc)
+ {
+ /* XXX: Do a separate case for when in != out (strictly should
+ check for overlap, too) */
+
+ /* First the forward pass */
+ iv = ivec;
+ iv2 = ivec + AES_BLOCK_SIZE;
+ while (len >= AES_BLOCK_SIZE)
+ {
+ for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+ out[n] = in[n] ^ iv[n];
+ AES_encrypt(out, out, key);
+ for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+ out[n] ^= iv2[n];
+ iv = out;
+ memcpy(prev, in, AES_BLOCK_SIZE);
+ iv2 = prev;
+ len -= AES_BLOCK_SIZE;
+ in += AES_BLOCK_SIZE;
+ out += AES_BLOCK_SIZE;
+ }
+
+ /* And now backwards */
+ iv = ivec + AES_BLOCK_SIZE*2;
+ iv2 = ivec + AES_BLOCK_SIZE*3;
+ len = length;
+ while(len >= AES_BLOCK_SIZE)
+ {
+ out -= AES_BLOCK_SIZE;
+ /* XXX: reduce copies by alternating between buffers */
+ memcpy(tmp, out, AES_BLOCK_SIZE);
+ for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+ out[n] ^= iv[n];
+ /* hexdump(stdout, "out ^ iv", out, AES_BLOCK_SIZE); */
+ AES_encrypt(out, out, key);
+ /* hexdump(stdout,"enc", out, AES_BLOCK_SIZE); */
+ /* hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE); */
+ for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+ out[n] ^= iv2[n];
+ /* hexdump(stdout,"out", out, AES_BLOCK_SIZE); */
+ iv = out;
+ memcpy(prev, tmp, AES_BLOCK_SIZE);
+ iv2 = prev;
+ len -= AES_BLOCK_SIZE;
+ }
+ }
+ else
+ {
+ /* First backwards */
+ iv = ivec + AES_BLOCK_SIZE*2;
+ iv2 = ivec + AES_BLOCK_SIZE*3;
+ in += length;
+ out += length;
+ while (len >= AES_BLOCK_SIZE)
+ {
+ in -= AES_BLOCK_SIZE;
+ out -= AES_BLOCK_SIZE;
+ memcpy(tmp, in, AES_BLOCK_SIZE);
+ memcpy(tmp2, in, AES_BLOCK_SIZE);
+ for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+ tmp[n] ^= iv2[n];
+ AES_decrypt(tmp, out, key);
+ for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+ out[n] ^= iv[n];
+ memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
+ iv = tmp3;
+ iv2 = out;
+ len -= AES_BLOCK_SIZE;
+ }
+
+ /* And now forwards */
+ iv = ivec;
+ iv2 = ivec + AES_BLOCK_SIZE;
+ len = length;
+ while (len >= AES_BLOCK_SIZE)
+ {
+ memcpy(tmp, out, AES_BLOCK_SIZE);
+ memcpy(tmp2, out, AES_BLOCK_SIZE);
+ for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+ tmp[n] ^= iv2[n];
+ AES_decrypt(tmp, out, key);
+ for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
+ out[n] ^= iv[n];
+ memcpy(tmp3, tmp2, AES_BLOCK_SIZE);
+ iv = tmp3;
+ iv2 = out;
+ len -= AES_BLOCK_SIZE;
+ in += AES_BLOCK_SIZE;
+ out += AES_BLOCK_SIZE;
+ }
+ }
+ }
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