diff options
Diffstat (limited to 'crypto/aes_generic.c')
| -rw-r--r-- | crypto/aes_generic.c | 325 |
1 files changed, 176 insertions, 149 deletions
diff --git a/crypto/aes_generic.c b/crypto/aes_generic.c index 6683260..df8df4d 100644 --- a/crypto/aes_generic.c +++ b/crypto/aes_generic.c @@ -63,8 +63,7 @@ /* * #define byte(x, nr) ((unsigned char)((x) >> (nr*8))) */ -static inline u8 -byte(const u32 x, const unsigned n) +static inline u8 byte(const u32 x, const unsigned n) { return x >> (n << 3); } @@ -88,55 +87,25 @@ static u32 it_tab[4][256]; static u32 fl_tab[4][256]; static u32 il_tab[4][256]; -static inline u8 __init -f_mult (u8 a, u8 b) +static inline u8 __init f_mult(u8 a, u8 b) { u8 aa = log_tab[a], cc = aa + log_tab[b]; return pow_tab[cc + (cc < aa ? 1 : 0)]; } -#define ff_mult(a,b) (a && b ? f_mult(a, b) : 0) - -#define f_rn(bo, bi, n, k) \ - bo[n] = ft_tab[0][byte(bi[n],0)] ^ \ - ft_tab[1][byte(bi[(n + 1) & 3],1)] ^ \ - ft_tab[2][byte(bi[(n + 2) & 3],2)] ^ \ - ft_tab[3][byte(bi[(n + 3) & 3],3)] ^ *(k + n) - -#define i_rn(bo, bi, n, k) \ - bo[n] = it_tab[0][byte(bi[n],0)] ^ \ - it_tab[1][byte(bi[(n + 3) & 3],1)] ^ \ - it_tab[2][byte(bi[(n + 2) & 3],2)] ^ \ - it_tab[3][byte(bi[(n + 1) & 3],3)] ^ *(k + n) - -#define ls_box(x) \ - ( fl_tab[0][byte(x, 0)] ^ \ - fl_tab[1][byte(x, 1)] ^ \ - fl_tab[2][byte(x, 2)] ^ \ - fl_tab[3][byte(x, 3)] ) - -#define f_rl(bo, bi, n, k) \ - bo[n] = fl_tab[0][byte(bi[n],0)] ^ \ - fl_tab[1][byte(bi[(n + 1) & 3],1)] ^ \ - fl_tab[2][byte(bi[(n + 2) & 3],2)] ^ \ - fl_tab[3][byte(bi[(n + 3) & 3],3)] ^ *(k + n) - -#define i_rl(bo, bi, n, k) \ - bo[n] = il_tab[0][byte(bi[n],0)] ^ \ - il_tab[1][byte(bi[(n + 3) & 3],1)] ^ \ - il_tab[2][byte(bi[(n + 2) & 3],2)] ^ \ - il_tab[3][byte(bi[(n + 1) & 3],3)] ^ *(k + n) - -static void __init -gen_tabs (void) +#define ff_mult(a, b) (a && b ? f_mult(a, b) : 0) + +static void __init gen_tabs(void) { u32 i, t; u8 p, q; - /* log and power tables for GF(2**8) finite field with - 0x011b as modular polynomial - the simplest primitive - root is 0x03, used here to generate the tables */ + /* + * log and power tables for GF(2**8) finite field with + * 0x011b as modular polynomial - the simplest primitive + * root is 0x03, used here to generate the tables + */ for (i = 0, p = 1; i < 256; ++i) { pow_tab[i] = (u8) p; @@ -170,9 +139,9 @@ gen_tabs (void) fl_tab[2][i] = rol32(t, 16); fl_tab[3][i] = rol32(t, 24); - t = ((u32) ff_mult (2, p)) | + t = ((u32) ff_mult(2, p)) | ((u32) p << 8) | - ((u32) p << 16) | ((u32) ff_mult (3, p) << 24); + ((u32) p << 16) | ((u32) ff_mult(3, p) << 24); ft_tab[0][i] = t; ft_tab[1][i] = rol32(t, 8); @@ -187,10 +156,10 @@ gen_tabs (void) il_tab[2][i] = rol32(t, 16); il_tab[3][i] = rol32(t, 24); - t = ((u32) ff_mult (14, p)) | - ((u32) ff_mult (9, p) << 8) | - ((u32) ff_mult (13, p) << 16) | - ((u32) ff_mult (11, p) << 24); + t = ((u32) ff_mult(14, p)) | + ((u32) ff_mult(9, p) << 8) | + ((u32) ff_mult(13, p) << 16) | + ((u32) ff_mult(11, p) << 24); it_tab[0][i] = t; it_tab[1][i] = rol32(t, 8); @@ -199,53 +168,80 @@ gen_tabs (void) } } -#define star_x(x) (((x) & 0x7f7f7f7f) << 1) ^ ((((x) & 0x80808080) >> 7) * 0x1b) - -#define imix_col(y,x) \ - u = star_x(x); \ - v = star_x(u); \ - w = star_x(v); \ - t = w ^ (x); \ - (y) = u ^ v ^ w; \ - (y) ^= ror32(u ^ t, 8) ^ \ - ror32(v ^ t, 16) ^ \ - ror32(t,24) - /* initialise the key schedule from the user supplied key */ -#define loop4(i) \ -{ t = ror32(t, 8); t = ls_box(t) ^ rco_tab[i]; \ - t ^= E_KEY[4 * i]; E_KEY[4 * i + 4] = t; \ - t ^= E_KEY[4 * i + 1]; E_KEY[4 * i + 5] = t; \ - t ^= E_KEY[4 * i + 2]; E_KEY[4 * i + 6] = t; \ - t ^= E_KEY[4 * i + 3]; E_KEY[4 * i + 7] = t; \ -} - -#define loop6(i) \ -{ t = ror32(t, 8); t = ls_box(t) ^ rco_tab[i]; \ - t ^= E_KEY[6 * i]; E_KEY[6 * i + 6] = t; \ - t ^= E_KEY[6 * i + 1]; E_KEY[6 * i + 7] = t; \ - t ^= E_KEY[6 * i + 2]; E_KEY[6 * i + 8] = t; \ - t ^= E_KEY[6 * i + 3]; E_KEY[6 * i + 9] = t; \ - t ^= E_KEY[6 * i + 4]; E_KEY[6 * i + 10] = t; \ - t ^= E_KEY[6 * i + 5]; E_KEY[6 * i + 11] = t; \ -} +#define star_x(x) (((x) & 0x7f7f7f7f) << 1) ^ ((((x) & 0x80808080) >> 7) * 0x1b) -#define loop8(i) \ -{ t = ror32(t, 8); ; t = ls_box(t) ^ rco_tab[i]; \ - t ^= E_KEY[8 * i]; E_KEY[8 * i + 8] = t; \ - t ^= E_KEY[8 * i + 1]; E_KEY[8 * i + 9] = t; \ - t ^= E_KEY[8 * i + 2]; E_KEY[8 * i + 10] = t; \ - t ^= E_KEY[8 * i + 3]; E_KEY[8 * i + 11] = t; \ - t = E_KEY[8 * i + 4] ^ ls_box(t); \ - E_KEY[8 * i + 12] = t; \ - t ^= E_KEY[8 * i + 5]; E_KEY[8 * i + 13] = t; \ - t ^= E_KEY[8 * i + 6]; E_KEY[8 * i + 14] = t; \ - t ^= E_KEY[8 * i + 7]; E_KEY[8 * i + 15] = t; \ -} +#define imix_col(y,x) do { \ + u = star_x(x); \ + v = star_x(u); \ + w = star_x(v); \ + t = w ^ (x); \ + (y) = u ^ v ^ w; \ + (y) ^= ror32(u ^ t, 8) ^ \ + ror32(v ^ t, 16) ^ \ + ror32(t, 24); \ +} while (0) + +#define ls_box(x) \ + fl_tab[0][byte(x, 0)] ^ \ + fl_tab[1][byte(x, 1)] ^ \ + fl_tab[2][byte(x, 2)] ^ \ + fl_tab[3][byte(x, 3)] + +#define loop4(i) do { \ + t = ror32(t, 8); \ + t = ls_box(t) ^ rco_tab[i]; \ + t ^= E_KEY[4 * i]; \ + E_KEY[4 * i + 4] = t; \ + t ^= E_KEY[4 * i + 1]; \ + E_KEY[4 * i + 5] = t; \ + t ^= E_KEY[4 * i + 2]; \ + E_KEY[4 * i + 6] = t; \ + t ^= E_KEY[4 * i + 3]; \ + E_KEY[4 * i + 7] = t; \ +} while (0) + +#define loop6(i) do { \ + t = ror32(t, 8); \ + t = ls_box(t) ^ rco_tab[i]; \ + t ^= E_KEY[6 * i]; \ + E_KEY[6 * i + 6] = t; \ + t ^= E_KEY[6 * i + 1]; \ + E_KEY[6 * i + 7] = t; \ + t ^= E_KEY[6 * i + 2]; \ + E_KEY[6 * i + 8] = t; \ + t ^= E_KEY[6 * i + 3]; \ + E_KEY[6 * i + 9] = t; \ + t ^= E_KEY[6 * i + 4]; \ + E_KEY[6 * i + 10] = t; \ + t ^= E_KEY[6 * i + 5]; \ + E_KEY[6 * i + 11] = t; \ +} while (0) + +#define loop8(i) do { \ + t = ror32(t, 8); \ + t = ls_box(t) ^ rco_tab[i]; \ + t ^= E_KEY[8 * i]; \ + E_KEY[8 * i + 8] = t; \ + t ^= E_KEY[8 * i + 1]; \ + E_KEY[8 * i + 9] = t; \ + t ^= E_KEY[8 * i + 2]; \ + E_KEY[8 * i + 10] = t; \ + t ^= E_KEY[8 * i + 3]; \ + E_KEY[8 * i + 11] = t; \ + t = E_KEY[8 * i + 4] ^ ls_box(t); \ + E_KEY[8 * i + 12] = t; \ + t ^= E_KEY[8 * i + 5]; \ + E_KEY[8 * i + 13] = t; \ + t ^= E_KEY[8 * i + 6]; \ + E_KEY[8 * i + 14] = t; \ + t ^= E_KEY[8 * i + 7]; \ + E_KEY[8 * i + 15] = t; \ +} while (0) static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, - unsigned int key_len) + unsigned int key_len) { struct aes_ctx *ctx = crypto_tfm_ctx(tfm); const __le32 *key = (const __le32 *)in_key; @@ -268,14 +264,14 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, case 16: t = E_KEY[3]; for (i = 0; i < 10; ++i) - loop4 (i); + loop4(i); break; case 24: E_KEY[4] = le32_to_cpu(key[4]); t = E_KEY[5] = le32_to_cpu(key[5]); for (i = 0; i < 8; ++i) - loop6 (i); + loop6(i); break; case 32: @@ -284,7 +280,7 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, E_KEY[6] = le32_to_cpu(key[6]); t = E_KEY[7] = le32_to_cpu(key[7]); for (i = 0; i < 7; ++i) - loop8 (i); + loop8(i); break; } @@ -294,7 +290,7 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, D_KEY[3] = E_KEY[3]; for (i = 4; i < key_len + 24; ++i) { - imix_col (D_KEY[i], E_KEY[i]); + imix_col(D_KEY[i], E_KEY[i]); } return 0; @@ -302,18 +298,34 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key, /* encrypt a block of text */ -#define f_nround(bo, bi, k) \ - f_rn(bo, bi, 0, k); \ - f_rn(bo, bi, 1, k); \ - f_rn(bo, bi, 2, k); \ - f_rn(bo, bi, 3, k); \ - k += 4 - -#define f_lround(bo, bi, k) \ - f_rl(bo, bi, 0, k); \ - f_rl(bo, bi, 1, k); \ - f_rl(bo, bi, 2, k); \ - f_rl(bo, bi, 3, k) +#define f_rn(bo, bi, n, k) do { \ + bo[n] = ft_tab[0][byte(bi[n], 0)] ^ \ + ft_tab[1][byte(bi[(n + 1) & 3], 1)] ^ \ + ft_tab[2][byte(bi[(n + 2) & 3], 2)] ^ \ + ft_tab[3][byte(bi[(n + 3) & 3], 3)] ^ *(k + n); \ +} while (0) + +#define f_nround(bo, bi, k) do {\ + f_rn(bo, bi, 0, k); \ + f_rn(bo, bi, 1, k); \ + f_rn(bo, bi, 2, k); \ + f_rn(bo, bi, 3, k); \ + k += 4; \ +} while (0) + +#define f_rl(bo, bi, n, k) do { \ + bo[n] = fl_tab[0][byte(bi[n], 0)] ^ \ + fl_tab[1][byte(bi[(n + 1) & 3], 1)] ^ \ + fl_tab[2][byte(bi[(n + 2) & 3], 2)] ^ \ + fl_tab[3][byte(bi[(n + 3) & 3], 3)] ^ *(k + n); \ +} while (0) + +#define f_lround(bo, bi, k) do {\ + f_rl(bo, bi, 0, k); \ + f_rl(bo, bi, 1, k); \ + f_rl(bo, bi, 2, k); \ + f_rl(bo, bi, 3, k); \ +} while (0) static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) { @@ -329,25 +341,25 @@ static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) b0[3] = le32_to_cpu(src[3]) ^ E_KEY[3]; if (ctx->key_length > 24) { - f_nround (b1, b0, kp); - f_nround (b0, b1, kp); + f_nround(b1, b0, kp); + f_nround(b0, b1, kp); } if (ctx->key_length > 16) { - f_nround (b1, b0, kp); - f_nround (b0, b1, kp); + f_nround(b1, b0, kp); + f_nround(b0, b1, kp); } - f_nround (b1, b0, kp); - f_nround (b0, b1, kp); - f_nround (b1, b0, kp); - f_nround (b0, b1, kp); - f_nround (b1, b0, kp); - f_nround (b0, b1, kp); - f_nround (b1, b0, kp); - f_nround (b0, b1, kp); - f_nround (b1, b0, kp); - f_lround (b0, b1, kp); + f_nround(b1, b0, kp); + f_nround(b0, b1, kp); + f_nround(b1, b0, kp); + f_nround(b0, b1, kp); + f_nround(b1, b0, kp); + f_nround(b0, b1, kp); + f_nround(b1, b0, kp); + f_nround(b0, b1, kp); + f_nround(b1, b0, kp); + f_lround(b0, b1, kp); dst[0] = cpu_to_le32(b0[0]); dst[1] = cpu_to_le32(b0[1]); @@ -357,18 +369,34 @@ static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) /* decrypt a block of text */ -#define i_nround(bo, bi, k) \ - i_rn(bo, bi, 0, k); \ - i_rn(bo, bi, 1, k); \ - i_rn(bo, bi, 2, k); \ - i_rn(bo, bi, 3, k); \ - k -= 4 - -#define i_lround(bo, bi, k) \ - i_rl(bo, bi, 0, k); \ - i_rl(bo, bi, 1, k); \ - i_rl(bo, bi, 2, k); \ - i_rl(bo, bi, 3, k) +#define i_rn(bo, bi, n, k) do { \ + bo[n] = it_tab[0][byte(bi[n], 0)] ^ \ + it_tab[1][byte(bi[(n + 3) & 3], 1)] ^ \ + it_tab[2][byte(bi[(n + 2) & 3], 2)] ^ \ + it_tab[3][byte(bi[(n + 1) & 3], 3)] ^ *(k + n); \ +} while (0) + +#define i_nround(bo, bi, k) do {\ + i_rn(bo, bi, 0, k); \ + i_rn(bo, bi, 1, k); \ + i_rn(bo, bi, 2, k); \ + i_rn(bo, bi, 3, k); \ + k -= 4; \ +} while (0) + +#define i_rl(bo, bi, n, k) do { \ + bo[n] = il_tab[0][byte(bi[n], 0)] ^ \ + il_tab[1][byte(bi[(n + 3) & 3], 1)] ^ \ + il_tab[2][byte(bi[(n + 2) & 3], 2)] ^ \ + il_tab[3][byte(bi[(n + 1) & 3], 3)] ^ *(k + n); \ +} while (0) + +#define i_lround(bo, bi, k) do {\ + i_rl(bo, bi, 0, k); \ + i_rl(bo, bi, 1, k); \ + i_rl(bo, bi, 2, k); \ + i_rl(bo, bi, 3, k); \ +} while (0) static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) { @@ -385,25 +413,25 @@ static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) b0[3] = le32_to_cpu(src[3]) ^ E_KEY[key_len + 27]; if (key_len > 24) { - i_nround (b1, b0, kp); - i_nround (b0, b1, kp); + i_nround(b1, b0, kp); + i_nround(b0, b1, kp); } if (key_len > 16) { - i_nround (b1, b0, kp); - i_nround (b0, b1, kp); + i_nround(b1, b0, kp); + i_nround(b0, b1, kp); } - i_nround (b1, b0, kp); - i_nround (b0, b1, kp); - i_nround (b1, b0, kp); - i_nround (b0, b1, kp); - i_nround (b1, b0, kp); - i_nround (b0, b1, kp); - i_nround (b1, b0, kp); - i_nround (b0, b1, kp); - i_nround (b1, b0, kp); - i_lround (b0, b1, kp); + i_nround(b1, b0, kp); + i_nround(b0, b1, kp); + i_nround(b1, b0, kp); + i_nround(b0, b1, kp); + i_nround(b1, b0, kp); + i_nround(b0, b1, kp); + i_nround(b1, b0, kp); + i_nround(b0, b1, kp); + i_nround(b1, b0, kp); + i_lround(b0, b1, kp); dst[0] = cpu_to_le32(b0[0]); dst[1] = cpu_to_le32(b0[1]); @@ -411,7 +439,6 @@ static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) dst[3] = cpu_to_le32(b0[3]); } - static struct crypto_alg aes_alg = { .cra_name = "aes", .cra_driver_name = "aes-generic", @@ -426,9 +453,9 @@ static struct crypto_alg aes_alg = { .cipher = { .cia_min_keysize = AES_MIN_KEY_SIZE, .cia_max_keysize = AES_MAX_KEY_SIZE, - .cia_setkey = aes_set_key, - .cia_encrypt = aes_encrypt, - .cia_decrypt = aes_decrypt + .cia_setkey = aes_set_key, + .cia_encrypt = aes_encrypt, + .cia_decrypt = aes_decrypt } } }; |
