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Differential D17 Diff 845 ../../new/gcrypt/cipher/rijndael.c

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../../new/gcrypt/cipher/rijndael.c

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typedef struct { typedef struct {
int ROUNDS; /* key-length-dependent number of rounds */ int ROUNDS; /* key-length-dependent number of rounds */
int decryption_prepared; int decryption_prepared;
byte keySched[MAXROUNDS+1][4][4]; /* key schedule */ byte __attribute__((aligned(4))) keySched[MAXROUNDS+1][4][4]; /* key schedule */
byte keySched2[MAXROUNDS+1][4][4]; /* key schedule */ byte __attribute__((aligned(4))) keySched2[MAXROUNDS+1][4][4]; /* key schedule */
} RIJNDAEL_context; } RIJNDAEL_context;
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/* Encrypt one block. A and B may be the same. */ /* Encrypt one block. A and B may be the same. */
static void static void
do_encrypt (const RIJNDAEL_context *ctx, byte *b, const byte *a) do_encrypt (const RIJNDAEL_context *ctx, byte *bx, const byte *ax)
{ {
/* FIXME: Ugly code, replace by straighter implementaion and use /* FIXME: Ugly code, replace by straighter implementaion and use
optimized assembler for common CPUs. */ optimized assembler for common CPUs. */
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u32 tempu32[4]; /* Force correct alignment. */ u32 tempu32[4]; /* Force correct alignment. */
byte temp[4][4]; byte temp[4][4];
} u; } u;
byte __attribute__((aligned(4))) a[16];
byte __attribute__((aligned(4))) b[16];
int ROUNDS = ctx->ROUNDS; int ROUNDS = ctx->ROUNDS;
#define rk (ctx->keySched) #define rk (ctx->keySched)
memcpy(a,ax,16);
*((u32*)u.temp[0]) = *((u32*)(a )) ^ *((u32*)rk[0][0]); *((u32*)u.temp[0]) = *((u32*)(a )) ^ *((u32*)rk[0][0]);
*((u32*)u.temp[1]) = *((u32*)(a+ 4)) ^ *((u32*)rk[0][1]); *((u32*)u.temp[1]) = *((u32*)(a+ 4)) ^ *((u32*)rk[0][1]);
*((u32*)u.temp[2]) = *((u32*)(a+ 8)) ^ *((u32*)rk[0][2]); *((u32*)u.temp[2]) = *((u32*)(a+ 8)) ^ *((u32*)rk[0][2]);
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*((u32*)(b+ 8)) ^= *((u32*)rk[ROUNDS][2]); *((u32*)(b+ 8)) ^= *((u32*)rk[ROUNDS][2]);
*((u32*)(b+12)) ^= *((u32*)rk[ROUNDS][3]); *((u32*)(b+12)) ^= *((u32*)rk[ROUNDS][3]);
#undef rk #undef rk
memcpy(bx,b,16);
} }
static void static void
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RIJNDAEL_context *ctx = context; RIJNDAEL_context *ctx = context;
do_encrypt (ctx, b, a); do_encrypt (ctx, b, a);
_gcry_burn_stack (16 + 2*sizeof(int)); _gcry_burn_stack (48 + 2*sizeof(int));
} }
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/* Decrypt one block. a and b may be the same. */ /* Decrypt one block. a and b may be the same. */
static void static void
do_decrypt (RIJNDAEL_context *ctx, byte *b, const byte *a) do_decrypt (RIJNDAEL_context *ctx, byte *bx, const byte *ax)
{ {
#define rk (ctx->keySched2) #define rk (ctx->keySched2)
int ROUNDS = ctx->ROUNDS; int ROUNDS = ctx->ROUNDS;
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u32 tempu32[4]; /* Force correct alignment. */ u32 tempu32[4]; /* Force correct alignment. */
byte temp[4][4]; byte temp[4][4];
} u; } u;
byte __attribute__((aligned(4))) a[16];
byte __attribute__((aligned(4))) b[16];
memcpy(a,ax,16);
if ( !ctx->decryption_prepared ) if ( !ctx->decryption_prepared )
{ {
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*((u32*)(b+ 8)) ^= *((u32*)rk[0][2]); *((u32*)(b+ 8)) ^= *((u32*)rk[0][2]);
*((u32*)(b+12)) ^= *((u32*)rk[0][3]); *((u32*)(b+12)) ^= *((u32*)rk[0][3]);
#undef rk #undef rk
memcpy(bx,b,16);
} }
static void static void
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RIJNDAEL_context *ctx = context; RIJNDAEL_context *ctx = context;
do_decrypt (ctx, b, a); do_decrypt (ctx, b, a);
_gcry_burn_stack (16+2*sizeof(int)); _gcry_burn_stack (48+2*sizeof(int));
} }
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