X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=crypto%2Fmodes%2Fxts128.c;h=55fa65447827d3993fab9a3cdc021a4307e675ba;hb=45c6e23c978da0b23df5e5a9a3c2e631b79ba497;hp=9cf27a25e9607b67cfcd5b696b5cdbf1e9aae77f;hpb=c7d0d0ae09fac5c2656ef5a2e635db12025921c6;p=oweals%2Fopenssl.git

diff --git a/crypto/modes/xts128.c b/crypto/modes/xts128.c
index 9cf27a25e9..55fa654478 100644
--- a/crypto/modes/xts128.c
+++ b/crypto/modes/xts128.c
@@ -6,7 +6,7 @@
  * 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
@@ -51,137 +51,147 @@
 #include "modes_lcl.h"
 #include <string.h>
 
-#ifndef MODES_DEBUG
-# ifndef NDEBUG
-#  define NDEBUG
-# endif
-#endif
-#include <assert.h>
-
-int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, const unsigned char iv[16],
-	const unsigned char *inp, unsigned char *out,
-	size_t len, int enc)
+int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx,
+                          const unsigned char iv[16],
+                          const unsigned char *inp, unsigned char *out,
+                          size_t len, int enc)
 {
-	const union { long one; char little; } is_endian = {1};
-	union { u64 u[2]; u32 d[4]; u8 c[16]; } tweak, scratch;
-	unsigned int i;
-
-	if (len<16) return -1;
-
-	memcpy(tweak.c, iv, 16);
-
-	(*ctx->block2)(tweak.c,tweak.c,ctx->key2);
-
-	if (!enc && (len%16)) len-=16;
-
-	while (len>=16) {
+    const union {
+        long one;
+        char little;
+    } is_endian = {
+        1
+    };
+    union {
+        u64 u[2];
+        u32 d[4];
+        u8 c[16];
+    } tweak, scratch;
+    unsigned int i;
+
+    if (len < 16)
+        return -1;
+
+    memcpy(tweak.c, iv, 16);
+
+    (*ctx->block2) (tweak.c, tweak.c, ctx->key2);
+
+    if (!enc && (len % 16))
+        len -= 16;
+
+    while (len >= 16) {
 #if defined(STRICT_ALIGNMENT)
-		memcpy(scratch.c,inp,16);
-		scratch.u[0] ^= tweak.u[0];
-		scratch.u[1] ^= tweak.u[1];
+        memcpy(scratch.c, inp, 16);
+        scratch.u[0] ^= tweak.u[0];
+        scratch.u[1] ^= tweak.u[1];
 #else
-		scratch.u[0] = ((u64*)inp)[0]^tweak.u[0];
-		scratch.u[1] = ((u64*)inp)[1]^tweak.u[1];
+        scratch.u[0] = ((u64 *)inp)[0] ^ tweak.u[0];
+        scratch.u[1] = ((u64 *)inp)[1] ^ tweak.u[1];
 #endif
-		(*ctx->block1)(scratch.c,scratch.c,ctx->key1);
+        (*ctx->block1) (scratch.c, scratch.c, ctx->key1);
 #if defined(STRICT_ALIGNMENT)
-		scratch.u[0] ^= tweak.u[0];
-		scratch.u[1] ^= tweak.u[1];
-		memcpy(out,scratch.c,16);
+        scratch.u[0] ^= tweak.u[0];
+        scratch.u[1] ^= tweak.u[1];
+        memcpy(out, scratch.c, 16);
 #else
-		((u64*)out)[0] = scratch.u[0]^=tweak.u[0];
-		((u64*)out)[1] = scratch.u[1]^=tweak.u[1];
+        ((u64 *)out)[0] = scratch.u[0] ^= tweak.u[0];
+        ((u64 *)out)[1] = scratch.u[1] ^= tweak.u[1];
 #endif
-		inp += 16;
-		out += 16;
-		len -= 16;
-
-		if (len==0)	return 0;
-
-		if (is_endian.little) {
-			unsigned int carry,res;
-			
-			res = 0x87&(((int)tweak.d[3])>>31);
-			carry = (unsigned int)(tweak.u[0]>>63);
-			tweak.u[0] = (tweak.u[0]<<1)^res;
-			tweak.u[1] = (tweak.u[1]<<1)|carry;
-		}
-		else {
-			size_t c;
-
-			for (c=0,i=0;i<16;++i) {
-				/*+ substitutes for |, because c is 1 bit */ 
-				c += ((size_t)tweak.c[i])<<1;
-				tweak.c[i] = (u8)c;
-				c = c>>8;
-			}
-			tweak.c[0] ^= (u8)(0x87&(0-c));
-		}
-	}
-	if (enc) {
-		for (i=0;i<len;++i) {
-			u8 c = inp[i];
-			out[i] = scratch.c[i];
-			scratch.c[i] = c;
-		}
-		scratch.u[0] ^= tweak.u[0];
-		scratch.u[1] ^= tweak.u[1];
-		(*ctx->block1)(scratch.c,scratch.c,ctx->key1);
-		scratch.u[0] ^= tweak.u[0];
-		scratch.u[1] ^= tweak.u[1];
-		memcpy(out-16,scratch.c,16);
-	}
-	else {
-		union { u64 u[2]; u8 c[16]; } tweak1;
-
-		if (is_endian.little) {
-			unsigned int carry,res;
-
-			res = 0x87&(((int)tweak.d[3])>>31);
-			carry = (unsigned int)(tweak.u[0]>>63);
-			tweak1.u[0] = (tweak.u[0]<<1)^res;
-			tweak1.u[1] = (tweak.u[1]<<1)|carry;
-		}
-		else {
-			size_t c;
-
-			for (c=0,i=0;i<16;++i) {
-				/*+ substitutes for |, because c is 1 bit */ 
-				c += ((size_t)tweak.c[i])<<1;
-				tweak1.c[i] = (u8)c;
-				c = c>>8;
-			}
-			tweak1.c[0] ^= (u8)(0x87&(0-c));
-		}
+        inp += 16;
+        out += 16;
+        len -= 16;
+
+        if (len == 0)
+            return 0;
+
+        if (is_endian.little) {
+            unsigned int carry, res;
+
+            res = 0x87 & (((int)tweak.d[3]) >> 31);
+            carry = (unsigned int)(tweak.u[0] >> 63);
+            tweak.u[0] = (tweak.u[0] << 1) ^ res;
+            tweak.u[1] = (tweak.u[1] << 1) | carry;
+        } else {
+            size_t c;
+
+            for (c = 0, i = 0; i < 16; ++i) {
+                /*
+                 * + substitutes for |, because c is 1 bit
+                 */
+                c += ((size_t)tweak.c[i]) << 1;
+                tweak.c[i] = (u8)c;
+                c = c >> 8;
+            }
+            tweak.c[0] ^= (u8)(0x87 & (0 - c));
+        }
+    }
+    if (enc) {
+        for (i = 0; i < len; ++i) {
+            u8 c = inp[i];
+            out[i] = scratch.c[i];
+            scratch.c[i] = c;
+        }
+        scratch.u[0] ^= tweak.u[0];
+        scratch.u[1] ^= tweak.u[1];
+        (*ctx->block1) (scratch.c, scratch.c, ctx->key1);
+        scratch.u[0] ^= tweak.u[0];
+        scratch.u[1] ^= tweak.u[1];
+        memcpy(out - 16, scratch.c, 16);
+    } else {
+        union {
+            u64 u[2];
+            u8 c[16];
+        } tweak1;
+
+        if (is_endian.little) {
+            unsigned int carry, res;
+
+            res = 0x87 & (((int)tweak.d[3]) >> 31);
+            carry = (unsigned int)(tweak.u[0] >> 63);
+            tweak1.u[0] = (tweak.u[0] << 1) ^ res;
+            tweak1.u[1] = (tweak.u[1] << 1) | carry;
+        } else {
+            size_t c;
+
+            for (c = 0, i = 0; i < 16; ++i) {
+                /*
+                 * + substitutes for |, because c is 1 bit
+                 */
+                c += ((size_t)tweak.c[i]) << 1;
+                tweak1.c[i] = (u8)c;
+                c = c >> 8;
+            }
+            tweak1.c[0] ^= (u8)(0x87 & (0 - c));
+        }
 #if defined(STRICT_ALIGNMENT)
-		memcpy(scratch.c,inp,16);
-		scratch.u[0] ^= tweak1.u[0];
-		scratch.u[1] ^= tweak1.u[1];
+        memcpy(scratch.c, inp, 16);
+        scratch.u[0] ^= tweak1.u[0];
+        scratch.u[1] ^= tweak1.u[1];
 #else
-		scratch.u[0] = ((u64*)inp)[0]^tweak1.u[0];
-		scratch.u[1] = ((u64*)inp)[1]^tweak1.u[1];
+        scratch.u[0] = ((u64 *)inp)[0] ^ tweak1.u[0];
+        scratch.u[1] = ((u64 *)inp)[1] ^ tweak1.u[1];
 #endif
-		(*ctx->block1)(scratch.c,scratch.c,ctx->key1);
-		scratch.u[0] ^= tweak1.u[0];
-		scratch.u[1] ^= tweak1.u[1];
-
-		for (i=0;i<len;++i) {
-			u8 c = inp[16+i];
-			out[16+i] = scratch.c[i];
-			scratch.c[i] = c;
-		}
-		scratch.u[0] ^= tweak.u[0];
-		scratch.u[1] ^= tweak.u[1];
-		(*ctx->block1)(scratch.c,scratch.c,ctx->key1);
+        (*ctx->block1) (scratch.c, scratch.c, ctx->key1);
+        scratch.u[0] ^= tweak1.u[0];
+        scratch.u[1] ^= tweak1.u[1];
+
+        for (i = 0; i < len; ++i) {
+            u8 c = inp[16 + i];
+            out[16 + i] = scratch.c[i];
+            scratch.c[i] = c;
+        }
+        scratch.u[0] ^= tweak.u[0];
+        scratch.u[1] ^= tweak.u[1];
+        (*ctx->block1) (scratch.c, scratch.c, ctx->key1);
 #if defined(STRICT_ALIGNMENT)
-		scratch.u[0] ^= tweak.u[0];
-		scratch.u[1] ^= tweak.u[1];
-		memcpy (out,scratch.c,16);
+        scratch.u[0] ^= tweak.u[0];
+        scratch.u[1] ^= tweak.u[1];
+        memcpy(out, scratch.c, 16);
 #else
-		((u64*)out)[0] = scratch.u[0]^tweak.u[0];
-		((u64*)out)[1] = scratch.u[1]^tweak.u[1];
+        ((u64 *)out)[0] = scratch.u[0] ^ tweak.u[0];
+        ((u64 *)out)[1] = scratch.u[1] ^ tweak.u[1];
 #endif
-	}
+    }
 
-	return 0;
+    return 0;
 }