X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Faes%2Faes_cfb.c;h=1225000963ea093237cd83404fba55b0d82f3253;hp=5ee3e7277b5ca4bd058cd782bfd491ac6b51508b;hb=56c77c52e1b0ad69fa133adb48c3221141b684c4;hpb=bcfd3d68f55396f362d7c7167f4f55267a0b0c13

diff --git a/crypto/aes/aes_cfb.c b/crypto/aes/aes_cfb.c
index 5ee3e7277b..1225000963 100644
--- a/crypto/aes/aes_cfb.c
+++ b/crypto/aes/aes_cfb.c
@@ -1,4 +1,4 @@
-/* crypto/aes/aes_cfb.c -*- mode:C; c-file-style: "eay" -*- */
+/* crypto/aes/aes_cfb.c */
 /* ====================================================================
  * Copyright (c) 2002-2006 The OpenSSL Project.  All rights reserved.
  *
@@ -7,7 +7,7 @@
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer. 
+ *    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
@@ -49,204 +49,37 @@
  *
  */
 
-#ifndef AES_DEBUG
-# ifndef NDEBUG
-#  define NDEBUG
-# endif
-#endif
-#include <assert.h>
-
 #include <openssl/aes.h>
-#include "aes_locl.h"
-#include "e_os.h"
-
-#define STRICT_ALIGNMENT
-#if defined(__i386) || defined(__i386__) || \
-    defined(__x86_64) || defined(__x86_64__) || \
-    defined(_M_IX86) || defined(_M_AMD64) || defined(_M_X64)
-#  undef STRICT_ALIGNMENT
-#endif
+#include <openssl/modes.h>
 
-/* The input and output encrypted as though 128bit cfb mode is being
- * used.  The extra state information to record how much of the
- * 128bit block we have used is contained in *num;
+/*
+ * The input and output encrypted as though 128bit cfb mode is being used.
+ * The extra state information to record how much of the 128bit block we have
+ * used is contained in *num;
  */
 
 void AES_cfb128_encrypt(const unsigned char *in, unsigned char *out,
-	unsigned long length, const AES_KEY *key,
-	unsigned char *ivec, int *num, const int enc) {
-
-    unsigned int n;
-    unsigned long l = 0;
-
-    assert(in && out && key && ivec && num);
-
-    n = *num;
+                        size_t length, const AES_KEY *key,
+                        unsigned char *ivec, int *num, const int enc)
+{
 
-#if !defined(OPENSSL_SMALL_FOOTPRINT)
-    if (AES_BLOCK_SIZE%sizeof(size_t) == 0) {	/* always true actually */
-	if (enc) {
-		if (n) {
-			while (length) {
-				*(out++) = ivec[n] ^= *(in++);
-				length--;
-				if(!(n = (n + 1) % AES_BLOCK_SIZE))
-					break;
-			}
-		}
-#if defined(STRICT_ALIGNMENT)
-		if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
-			goto enc_unaligned;
-#endif
-		while ((l + AES_BLOCK_SIZE) <= length) {
-			unsigned int i;
-			AES_encrypt(ivec, ivec, key);
-			for (i=0;i<AES_BLOCK_SIZE;i+=sizeof(size_t)) {
-				*(size_t*)(out+l+i) =
-				*(size_t*)(ivec+i) ^= *(size_t*)(in+l+i);
-			}
-			l += AES_BLOCK_SIZE;
-		}
-
-		if (l < length) {
-			AES_encrypt(ivec, ivec, key);
-			do {	out[l] = ivec[n] ^= in[l];
-				l++; n++;
-			} while (l < length);
-		}
-	} else {
-		if (n) {
-			while (length) {
-				unsigned char c;
-				*(out++) = ivec[n] ^ (c = *(in++)); ivec[n] = c;
-				length--;
-				if(!(n = (n + 1) % AES_BLOCK_SIZE))
-					break;
- 			}
-		}
-#if defined(STRICT_ALIGNMENT)
-		if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0)
-			goto dec_unaligned;
-#endif
-		while (l + AES_BLOCK_SIZE <= length) {
-			unsigned int i;
-			AES_encrypt(ivec, ivec, key);
-			for (i=0;i<AES_BLOCK_SIZE;i+=sizeof(size_t)) {
-				size_t t = *(size_t*)(in+l+i);
-				*(size_t*)(out+l+i) = *(size_t*)(ivec+i) ^ t;
-				*(size_t*)(ivec+i) = t;
-			}
-			l += AES_BLOCK_SIZE;
-		}
-
-		if (l < length) {
-			AES_encrypt(ivec, ivec, key);
-			do {	unsigned char c;
-				out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c;
-				l++; n++;
-			} while (l < length);
- 		}
-	}
-	*num = n;
-	return;
-    }
-#endif
-
-    /* this code would be commonly eliminated by x86* compiler */
-	if (enc) {
-#if defined(STRICT_ALIGNMENT) && !defined(OPENSSL_SMALL_FOOTPRINT)
-	    enc_unaligned:
-#endif
-		while (l<length) {
-			if (n == 0) {
-				AES_encrypt(ivec, ivec, key);
-			}
-			out[l] = ivec[n] ^= in[l];
-			l++;
-			n = (n+1) % AES_BLOCK_SIZE;
-		}
-	} else {
-#if defined(STRICT_ALIGNMENT) && !defined(OPENSSL_SMALL_FOOTPRINT)
-	    dec_unaligned:
-#endif
-		while (l<length) {
-			unsigned char c;
-			if (n == 0) {
-				AES_encrypt(ivec, ivec, key);
-			}
-			out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c;
-			l++;
-			n = (n+1) % AES_BLOCK_SIZE;
-		}
-	}
-
-	*num=n;
+    CRYPTO_cfb128_encrypt(in, out, length, key, ivec, num, enc,
+                          (block128_f) AES_encrypt);
 }
 
-/* This expects a single block of size nbits for both in and out. Note that
-   it corrupts any extra bits in the last byte of out */
-void AES_cfbr_encrypt_block(const unsigned char *in,unsigned char *out,
-			    const int nbits,const AES_KEY *key,
-			    unsigned char *ivec,const int enc)
-    {
-    int n,rem,num;
-    unsigned char ovec[AES_BLOCK_SIZE*2];
-
-    if (nbits<=0 || nbits>128) return;
-
-	/* fill in the first half of the new IV with the current IV */
-	memcpy(ovec,ivec,AES_BLOCK_SIZE);
-	/* construct the new IV */
-	AES_encrypt(ivec,ivec,key);
-	num = (nbits+7)/8;
-	if (enc)	/* encrypt the input */
-	    for(n=0 ; n < num ; ++n)
-		out[n] = (ovec[AES_BLOCK_SIZE+n] = in[n] ^ ivec[n]);
-	else		/* decrypt the input */
-	    for(n=0 ; n < num ; ++n)
-		out[n] = (ovec[AES_BLOCK_SIZE+n] = in[n]) ^ ivec[n];
-	/* shift ovec left... */
-	rem = nbits%8;
-	num = nbits/8;
-	if(rem==0)
-	    memcpy(ivec,ovec+num,AES_BLOCK_SIZE);
-	else
-	    for(n=0 ; n < AES_BLOCK_SIZE ; ++n)
-		ivec[n] = ovec[n+num]<<rem | ovec[n+num+1]>>(8-rem);
-
-    /* it is not necessary to cleanse ovec, since the IV is not secret */
-    }
-
 /* N.B. This expects the input to be packed, MS bit first */
 void AES_cfb1_encrypt(const unsigned char *in, unsigned char *out,
-		      const unsigned long length, const AES_KEY *key,
-		      unsigned char *ivec, int *num, const int enc)
-    {
-    unsigned int n;
-    unsigned char c[1],d[1];
-
-    assert(in && out && key && ivec && num);
-    assert(*num == 0);
-
-    memset(out,0,(length+7)/8);
-    for(n=0 ; n < length ; ++n)
-	{
-	c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
-	AES_cfbr_encrypt_block(c,d,1,key,ivec,enc);
-	out[n/8]=(out[n/8]&~(1 << (7-n%8)))|((d[0]&0x80) >> (n%8));
-	}
-    }
+                      size_t length, const AES_KEY *key,
+                      unsigned char *ivec, int *num, const int enc)
+{
+    CRYPTO_cfb128_1_encrypt(in, out, length, key, ivec, num, enc,
+                            (block128_f) AES_encrypt);
+}
 
 void AES_cfb8_encrypt(const unsigned char *in, unsigned char *out,
-		      const unsigned long length, const AES_KEY *key,
-		      unsigned char *ivec, int *num, const int enc)
-    {
-    unsigned int n;
-
-    assert(in && out && key && ivec && num);
-    assert(*num == 0);
-
-    for(n=0 ; n < length ; ++n)
-	AES_cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc);
-    }
-
+                      size_t length, const AES_KEY *key,
+                      unsigned char *ivec, int *num, const int enc)
+{
+    CRYPTO_cfb128_8_encrypt(in, out, length, key, ivec, num, enc,
+                            (block128_f) AES_encrypt);
+}