diff options
Diffstat (limited to 'web/server/h2o/libh2o/deps/picotls/deps/cifra/src/aes.c')
-rw-r--r-- | web/server/h2o/libh2o/deps/picotls/deps/cifra/src/aes.c | 419 |
1 files changed, 419 insertions, 0 deletions
diff --git a/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/aes.c b/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/aes.c new file mode 100644 index 000000000..545588e57 --- /dev/null +++ b/web/server/h2o/libh2o/deps/picotls/deps/cifra/src/aes.c @@ -0,0 +1,419 @@ +/* + * cifra - embedded cryptography library + * Written in 2014 by Joseph Birr-Pixton <jpixton@gmail.com> + * + * To the extent possible under law, the author(s) have dedicated all + * copyright and related and neighboring rights to this software to the + * public domain worldwide. This software is distributed without any + * warranty. + * + * You should have received a copy of the CC0 Public Domain Dedication + * along with this software. If not, see + * <http://creativecommons.org/publicdomain/zero/1.0/>. + */ + +#include <string.h> +#include <stdlib.h> + +#include "cf_config.h" +#include "aes.h" +#include "handy.h" +#include "bitops.h" +#include "tassert.h" + +static const uint8_t S[256] = +{ + 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, + 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, + 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, + 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 0x04, 0xc7, 0x23, 0xc3, + 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 0x09, + 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, + 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, + 0x39, 0x4a, 0x4c, 0x58, 0xcf, 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, + 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, + 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, + 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, + 0x73, 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, + 0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, + 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, + 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 0xba, 0x78, 0x25, + 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, + 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, + 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, + 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, + 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16 +}; + +static const uint8_t Rcon[11] = +{ + 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36 +}; + +#ifdef INLINE_FUNCS +static inline uint32_t word4(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3) +{ + return b0 << 24 | b1 << 16 | b2 << 8 | b3; +} + +static inline uint8_t byte(uint32_t w, unsigned x) +{ + /* nb. bytes are numbered 0 (leftmost, top) + * to 3 (rightmost). */ + x = 3 - x; + return (w >> (x * 8)) & 0xff; +} + +static uint32_t round_constant(uint32_t i) +{ + return Rcon[i] << 24; +} + +static uint32_t rot_word(uint32_t w) +{ + /* Takes + * word [a0,a1,a2,a3] + * returns + * word [a1,a2,a3,a0] + * + */ + return rotl32(w, 8); +} +#endif + +#define word4(a, b, c, d) (((uint32_t)(a) << 24) | ((uint32_t)(b) << 16) | ((uint32_t)(c) << 8) | (d)) +#define byte(w, x) ((w >> ((3 - (x)) << 3)) & 0xff) +#define round_constant(i) ((uint32_t)(Rcon[i]) << 24) +#define rot_word(w) rotl32((w), 8) + +static uint32_t sub_word(uint32_t w, const uint8_t *sbox) +{ + uint8_t a = byte(w, 0), + b = byte(w, 1), + c = byte(w, 2), + d = byte(w, 3); +#if CF_CACHE_SIDE_CHANNEL_PROTECTION + select_u8x4(&a, &b, &c, &d, sbox, 256); +#else + a = sbox[a]; + b = sbox[b]; + c = sbox[c]; + d = sbox[d]; +#endif + return word4(a, b, c, d); +} + +static void aes_schedule(cf_aes_context *ctx, const uint8_t *key, size_t nkey) +{ + size_t i, + nb = AES_BLOCKSZ / 4, + nk = nkey / 4, + n = nb * (ctx->rounds + 1); + uint32_t *w = ctx->ks; + + /* First words are just the key. */ + for (i = 0; i < nk; i++) + { + w[i] = read32_be(key + i * 4); + } + + uint32_t i_div_nk = 1; + uint32_t i_mod_nk = 0; + + for (; i < n; i++, i_mod_nk++) + { + uint32_t temp = w[i - 1]; + + if (i_mod_nk == nk) + { + i_div_nk++; + i_mod_nk = 0; + } + + if (i_mod_nk == 0) + temp = sub_word(rot_word(temp), S) ^ round_constant(i_div_nk); + else if (nk > 6 && i_mod_nk == 4) + temp = sub_word(temp, S); + + w[i] = w[i - nk] ^ temp; + } +} + +void cf_aes_init(cf_aes_context *ctx, const uint8_t *key, size_t nkey) +{ + memset(ctx, 0, sizeof *ctx); + + switch (nkey) + { +#if CF_AES_MAXROUNDS >= AES128_ROUNDS + case 16: + ctx->rounds = AES128_ROUNDS; + aes_schedule(ctx, key, nkey); + break; +#endif + +#if CF_AES_MAXROUNDS >= AES192_ROUNDS + case 24: + ctx->rounds = AES192_ROUNDS; + aes_schedule(ctx, key, nkey); + break; +#endif + +#if CF_AES_MAXROUNDS >= AES256_ROUNDS + case 32: + ctx->rounds = AES256_ROUNDS; + aes_schedule(ctx, key, nkey); + break; +#endif + + default: + abort(); + } +} + +static void add_round_key(uint32_t state[4], const uint32_t rk[4]) +{ + state[0] ^= rk[0]; + state[1] ^= rk[1]; + state[2] ^= rk[2]; + state[3] ^= rk[3]; +} + +static void sub_block(uint32_t state[4]) +{ + state[0] = sub_word(state[0], S); + state[1] = sub_word(state[1], S); + state[2] = sub_word(state[2], S); + state[3] = sub_word(state[3], S); +} + +static void shift_rows(uint32_t state[4]) +{ + uint32_t u, v, x, y; + + u = word4(byte(state[0], 0), + byte(state[1], 1), + byte(state[2], 2), + byte(state[3], 3)); + + v = word4(byte(state[1], 0), + byte(state[2], 1), + byte(state[3], 2), + byte(state[0], 3)); + + x = word4(byte(state[2], 0), + byte(state[3], 1), + byte(state[0], 2), + byte(state[1], 3)); + + y = word4(byte(state[3], 0), + byte(state[0], 1), + byte(state[1], 2), + byte(state[2], 3)); + + state[0] = u; + state[1] = v; + state[2] = x; + state[3] = y; +} + +static uint32_t gf_poly_mul2(uint32_t x) +{ + return + ((x & 0x7f7f7f7f) << 1) ^ + (((x & 0x80808080) >> 7) * 0x1b); +} + +static uint32_t mix_column(uint32_t x) +{ + uint32_t x2 = gf_poly_mul2(x); + return x2 ^ rotr32(x ^ x2, 24) ^ rotr32(x, 16) ^ rotr32(x, 8); +} + +static void mix_columns(uint32_t state[4]) +{ + state[0] = mix_column(state[0]); + state[1] = mix_column(state[1]); + state[2] = mix_column(state[2]); + state[3] = mix_column(state[3]); +} + +void cf_aes_encrypt(const cf_aes_context *ctx, + const uint8_t in[AES_BLOCKSZ], + uint8_t out[AES_BLOCKSZ]) +{ + assert(ctx->rounds == AES128_ROUNDS || + ctx->rounds == AES192_ROUNDS || + ctx->rounds == AES256_ROUNDS); + + uint32_t state[4] = { + read32_be(in + 0), + read32_be(in + 4), + read32_be(in + 8), + read32_be(in + 12) + }; + + const uint32_t *round_keys = ctx->ks; + add_round_key(state, round_keys); + round_keys += 4; + + uint32_t round; + for (round = 1; round < ctx->rounds; round++) + { + sub_block(state); + shift_rows(state); + mix_columns(state); + add_round_key(state, round_keys); + round_keys += 4; + } + + sub_block(state); + shift_rows(state); + add_round_key(state, round_keys); + + write32_be(state[0], out + 0); + write32_be(state[1], out + 4); + write32_be(state[2], out + 8); + write32_be(state[3], out + 12); +} + +#if CF_AES_ENCRYPT_ONLY == 0 +static const uint8_t S_inv[256] = +{ + 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, + 0xf3, 0xd7, 0xfb, 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, + 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, + 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, 0x08, 0x2e, 0xa1, 0x66, + 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, 0x72, + 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, + 0xb6, 0x92, 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, + 0x57, 0xa7, 0x8d, 0x9d, 0x84, 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, + 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, 0xd0, 0x2c, 0x1e, 0x8f, 0xca, + 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, 0x3a, 0x91, + 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, + 0x73, 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, + 0x1c, 0x75, 0xdf, 0x6e, 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, + 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, + 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, 0x1f, 0xdd, 0xa8, + 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, + 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, + 0xc9, 0x9c, 0xef, 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, + 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, + 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d +}; + +static void inv_sub_block(uint32_t state[4]) +{ + state[0] = sub_word(state[0], S_inv); + state[1] = sub_word(state[1], S_inv); + state[2] = sub_word(state[2], S_inv); + state[3] = sub_word(state[3], S_inv); +} + +static void inv_shift_rows(uint32_t state[4]) +{ + uint32_t u, v, x, y; + + u = word4(byte(state[0], 0), + byte(state[3], 1), + byte(state[2], 2), + byte(state[1], 3)); + + v = word4(byte(state[1], 0), + byte(state[0], 1), + byte(state[3], 2), + byte(state[2], 3)); + + x = word4(byte(state[2], 0), + byte(state[1], 1), + byte(state[0], 2), + byte(state[3], 3)); + + y = word4(byte(state[3], 0), + byte(state[2], 1), + byte(state[1], 2), + byte(state[0], 3)); + + state[0] = u; + state[1] = v; + state[2] = x; + state[3] = y; +} + +static uint32_t inv_mix_column(uint32_t x) +{ + uint32_t x2 = gf_poly_mul2(x), + x4 = gf_poly_mul2(x2), + x9 = x ^ gf_poly_mul2(x4), + x11 = x2 ^ x9, + x13 = x4 ^ x9; + + return x ^ x2 ^ x13 ^ rotr32(x11, 24) ^ rotr32(x13, 16) ^ rotr32(x9, 8); +} + +static void inv_mix_columns(uint32_t state[4]) +{ + state[0] = inv_mix_column(state[0]); + state[1] = inv_mix_column(state[1]); + state[2] = inv_mix_column(state[2]); + state[3] = inv_mix_column(state[3]); +} + +void cf_aes_decrypt(const cf_aes_context *ctx, + const uint8_t in[AES_BLOCKSZ], + uint8_t out[AES_BLOCKSZ]) +{ + assert(ctx->rounds == AES128_ROUNDS || + ctx->rounds == AES192_ROUNDS || + ctx->rounds == AES256_ROUNDS); + + uint32_t state[4] = { + read32_be(in + 0), + read32_be(in + 4), + read32_be(in + 8), + read32_be(in + 12) + }; + + const uint32_t *round_keys = &ctx->ks[ctx->rounds << 2]; + add_round_key(state, round_keys); + round_keys -= 4; + + uint32_t round; + for (round = ctx->rounds - 1; round != 0; round--) + { + inv_shift_rows(state); + inv_sub_block(state); + add_round_key(state, round_keys); + inv_mix_columns(state); + round_keys -= 4; + } + + inv_shift_rows(state); + inv_sub_block(state); + add_round_key(state, round_keys); + + write32_be(state[0], out + 0); + write32_be(state[1], out + 4); + write32_be(state[2], out + 8); + write32_be(state[3], out + 12); +} +#else +void cf_aes_decrypt(const cf_aes_context *ctx, + const uint8_t in[AES_BLOCKSZ], + uint8_t out[AES_BLOCKSZ]) +{ + abort(); +} +#endif + +void cf_aes_finish(cf_aes_context *ctx) +{ + mem_clean(ctx, sizeof *ctx); +} + +const cf_prp cf_aes = { + .blocksz = AES_BLOCKSZ, + .encrypt = (cf_prp_block) cf_aes_encrypt, + .decrypt = (cf_prp_block) cf_aes_decrypt +}; + |