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aria: use unsigned type for bit count

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Manuel Pégourié-Gonnard 2018-02-21 09:44:29 +01:00
parent e1ad7491c5
commit 9cc89248fe
1 changed files with 11 additions and 10 deletions
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17
library/aria.c
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@ -296,21 +296,22 @@ static void aria_fe_xor(uint32_t r[4],
// little-endian targets and stores state in that order. // little-endian targets and stores state in that order.
static void aria_rot128(uint32_t r[4], const uint32_t a[4], static void aria_rot128(uint32_t r[4], const uint32_t a[4],
const uint32_t b[4], int n) const uint32_t b[4], uint8_t n)
{ {
int i, j, n1, n2; uint8_t i, j;
uint32_t t, u; uint32_t t, u;
j = (n >> 5) & 3; // word offset const uint8_t n1 = n & 0x1F; // bit offset
n1 = n & 0x1F; // bit offsets const uint8_t n2 = 32 - n1; // reverse bit offset
n2 = 32 - n1; // n1 should be nonzero!
j = (n >> 5) & 3; // initial word offset
t = ARIA_FLIP1( ARIA_FLIP2( b[j] ) ); // big endian t = ARIA_FLIP1( ARIA_FLIP2( b[j] ) ); // big endian
for( i = 0; i < 4; i++ ) for( i = 0; i < 4; i++ )
{ {
j = (j + 1) & 3; // get next word, big endian j = (j + 1) & 3; // get next word, big endian
u = ARIA_FLIP1( ARIA_FLIP2( b[j] ) ); u = ARIA_FLIP1( ARIA_FLIP2( b[j] ) );
t <<= n1; // rotate t <<= n1; // rotate
if (n2 < 32) // intel rotate 32 bits = 0 bits.. if (n2 < 32) // rotate 32 bits = 0 bits..
t |= u >> n2; t |= u >> n2;
t = ARIA_FLIP1( ARIA_FLIP2( t ) ); // back to little endian t = ARIA_FLIP1( ARIA_FLIP2( t ) ); // back to little endian
r[i] = a[i] ^ t; // store r[i] = a[i] ^ t; // store
@ -367,8 +368,8 @@ int mbedtls_aria_setkey_enc(mbedtls_aria_context *ctx,
for( i = 0; i < 4; i++ ) // create round keys for( i = 0; i < 4; i++ ) // create round keys
{ {
w2 = w[(i + 1) & 3]; w2 = w[(i + 1) & 3];
aria_rot128( ctx->rk[i ], w[i], w2, -19); aria_rot128( ctx->rk[i ], w[i], w2, 128 - 19 );
aria_rot128( ctx->rk[i + 4], w[i], w2, -31); aria_rot128( ctx->rk[i + 4], w[i], w2, 128 - 31 );
aria_rot128( ctx->rk[i + 8], w[i], w2, 61 ); aria_rot128( ctx->rk[i + 8], w[i], w2, 61 );
aria_rot128( ctx->rk[i + 12], w[i], w2, 31 ); aria_rot128( ctx->rk[i + 12], w[i], w2, 31 );
} }