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mod_p224 now working with 8-bit and 16-bit ints

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Manuel Pégourié-Gonnard 2013-10-22 21:07:14 +02:00
parent a47e7058ea
commit 2a08c0debc
1 changed files with 31 additions and 10 deletions
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41
library/ecp.c
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@ -543,7 +543,7 @@ cleanup:
#undef LAST #undef LAST
#endif /* POLARSSL_ECP_DP_SECP192R1_ENABLED */ #endif /* POLARSSL_ECP_DP_SECP192R1_ENABLED */
#if defined(POLARSSL_ECP_DP_SECP521R1_ENABLED) #if defined(POLARSSL_ECP_DP_SECP224R1_ENABLED)
static inline void add32( uint32_t *dst, uint32_t src, signed char *carry ) static inline void add32( uint32_t *dst, uint32_t src, signed char *carry )
{ {
@ -557,12 +557,34 @@ static inline void sub32( uint32_t *dst, uint32_t src, signed char *carry )
*dst -= src; *dst -= src;
} }
#if defined(POLARSSL_HAVE_INT16) || defined(POLARSSL_HAVE_INT8) #if defined(POLARSSL_HAVE_INT8)
#error "Currently not supported, WIP"
#define MAX32 N->n / 4
#define A( j ) (uint32_t)( N->p[4*j+0] ) | \
( N->p[4*j+1] << 8 ) | \
( N->p[4*j+2] << 16 ) | \
( N->p[4*j+3] << 24 )
#define STORE32 N->p[4*i+0] = (uint8_t)( cur ); \
N->p[4*i+1] = (uint8_t)( cur >> 8 ); \
N->p[4*i+2] = (uint8_t)( cur >> 16 ); \
N->p[4*i+3] = (uint8_t)( cur >> 24 );
#elif defined(POLARSSL_HAVE_INT16)
#define MAX32 N->n / 2
#define A( j ) (uint32_t)( N->p[2*j] ) | ( N->p[2*j+1] << 16 )
#define STORE32 N->p[2*i+0] = (uint16_t)( cur ); \
N->p[2*i+1] = (uint16_t)( cur >> 16 );
#elif defined(POLARSSL_HAVE_INT32) #elif defined(POLARSSL_HAVE_INT32)
#define MAX32 N->n
#define A( j ) N->p[j] #define A( j ) N->p[j]
#define STORE32 N->p[i] = cur; #define STORE32 N->p[i] = cur;
#else /* 64-bit */ #else /* 64-bit */
#define MAX32 N->n * 2
#define A( j ) j % 2 ? (uint32_t)( N->p[j/2] >> 32 ) : (uint32_t)( N->p[j/2] ) #define A( j ) j % 2 ? (uint32_t)( N->p[j/2] >> 32 ) : (uint32_t)( N->p[j/2] )
#define STORE32 \ #define STORE32 \
if( i % 2 ) { \ if( i % 2 ) { \
@ -572,6 +594,7 @@ static inline void sub32( uint32_t *dst, uint32_t src, signed char *carry )
N->p[i/2] &= 0xFFFFFFFF00000000; \ N->p[i/2] &= 0xFFFFFFFF00000000; \
N->p[i/2] |= (uint64_t) cur; \ N->p[i/2] |= (uint64_t) cur; \
} }
#endif #endif
#define ADD( j ) add32( &cur, A( j ), &c ); #define ADD( j ) add32( &cur, A( j ), &c );
@ -587,14 +610,12 @@ static inline void sub32( uint32_t *dst, uint32_t src, signed char *carry )
if( cc < 0 ) \ if( cc < 0 ) \
sub32( &cur, -cc, &c ); \ sub32( &cur, -cc, &c ); \
else \ else \
add32( &cur, cc, &c ); add32( &cur, cc, &c ); \
#define LAST \ #define LAST \
STORE32; i++; \ STORE32; i++; \
cur = c > 0 ? c : 0; STORE32; /* see fix_negative */ \ cur = c > 0 ? c : 0; STORE32; \
cur = 0; \ cur = 0; while( ++i < MAX32 ) { STORE32; } \
while( ++i < N->n * sizeof( t_uint ) / sizeof( uint32_t ) ) \
STORE32; \
if( c < 0 ) fix_negative( N, c, bits ); if( c < 0 ) fix_negative( N, c, bits );
/* /*