diff options
author | Andy Polyakov <appro@openssl.org> | 2007-01-25 20:47:00 +0000 |
---|---|---|
committer | Andy Polyakov <appro@openssl.org> | 2007-01-25 20:47:00 +0000 |
commit | 82686bdcaa13d4a43f28a878e40dcd59499543e7 (patch) | |
tree | 9595ec3aa47f0fc3b1b18c5129654d3e13e6ac43 /crypto/aes | |
parent | 14b1d089b683fb45fc2ecb90d02ad7b8d163a536 (diff) |
Minimize aes_core.c footprint when AES_[en|de]crypt is implemented in
assembler.
Diffstat (limited to 'crypto/aes')
-rw-r--r-- | crypto/aes/aes_core.c | 201 |
1 files changed, 200 insertions, 1 deletions
diff --git a/crypto/aes/aes_core.c b/crypto/aes/aes_core.c index 3a80e18b0a..a7ec54f4da 100644 --- a/crypto/aes/aes_core.c +++ b/crypto/aes/aes_core.c @@ -39,6 +39,7 @@ #include <openssl/aes.h> #include "aes_locl.h" +#ifndef AES_ASM /* Te0[x] = S [x].[02, 01, 01, 03]; Te1[x] = S [x].[03, 02, 01, 01]; @@ -773,7 +774,6 @@ int AES_set_decrypt_key(const unsigned char *userKey, const int bits, return 0; } -#ifndef AES_ASM /* * Encrypt a single block * in and out can overlap @@ -1156,4 +1156,203 @@ void AES_decrypt(const unsigned char *in, unsigned char *out, PUTU32(out + 12, s3); } +#else /* AES_ASM */ + +static const u8 Te4[256] = { + 0x63U, 0x7cU, 0x77U, 0x7bU, 0xf2U, 0x6bU, 0x6fU, 0xc5U, + 0x30U, 0x01U, 0x67U, 0x2bU, 0xfeU, 0xd7U, 0xabU, 0x76U, + 0xcaU, 0x82U, 0xc9U, 0x7dU, 0xfaU, 0x59U, 0x47U, 0xf0U, + 0xadU, 0xd4U, 0xa2U, 0xafU, 0x9cU, 0xa4U, 0x72U, 0xc0U, + 0xb7U, 0xfdU, 0x93U, 0x26U, 0x36U, 0x3fU, 0xf7U, 0xccU, + 0x34U, 0xa5U, 0xe5U, 0xf1U, 0x71U, 0xd8U, 0x31U, 0x15U, + 0x04U, 0xc7U, 0x23U, 0xc3U, 0x18U, 0x96U, 0x05U, 0x9aU, + 0x07U, 0x12U, 0x80U, 0xe2U, 0xebU, 0x27U, 0xb2U, 0x75U, + 0x09U, 0x83U, 0x2cU, 0x1aU, 0x1bU, 0x6eU, 0x5aU, 0xa0U, + 0x52U, 0x3bU, 0xd6U, 0xb3U, 0x29U, 0xe3U, 0x2fU, 0x84U, + 0x53U, 0xd1U, 0x00U, 0xedU, 0x20U, 0xfcU, 0xb1U, 0x5bU, + 0x6aU, 0xcbU, 0xbeU, 0x39U, 0x4aU, 0x4cU, 0x58U, 0xcfU, + 0xd0U, 0xefU, 0xaaU, 0xfbU, 0x43U, 0x4dU, 0x33U, 0x85U, + 0x45U, 0xf9U, 0x02U, 0x7fU, 0x50U, 0x3cU, 0x9fU, 0xa8U, + 0x51U, 0xa3U, 0x40U, 0x8fU, 0x92U, 0x9dU, 0x38U, 0xf5U, + 0xbcU, 0xb6U, 0xdaU, 0x21U, 0x10U, 0xffU, 0xf3U, 0xd2U, + 0xcdU, 0x0cU, 0x13U, 0xecU, 0x5fU, 0x97U, 0x44U, 0x17U, + 0xc4U, 0xa7U, 0x7eU, 0x3dU, 0x64U, 0x5dU, 0x19U, 0x73U, + 0x60U, 0x81U, 0x4fU, 0xdcU, 0x22U, 0x2aU, 0x90U, 0x88U, + 0x46U, 0xeeU, 0xb8U, 0x14U, 0xdeU, 0x5eU, 0x0bU, 0xdbU, + 0xe0U, 0x32U, 0x3aU, 0x0aU, 0x49U, 0x06U, 0x24U, 0x5cU, + 0xc2U, 0xd3U, 0xacU, 0x62U, 0x91U, 0x95U, 0xe4U, 0x79U, + 0xe7U, 0xc8U, 0x37U, 0x6dU, 0x8dU, 0xd5U, 0x4eU, 0xa9U, + 0x6cU, 0x56U, 0xf4U, 0xeaU, 0x65U, 0x7aU, 0xaeU, 0x08U, + 0xbaU, 0x78U, 0x25U, 0x2eU, 0x1cU, 0xa6U, 0xb4U, 0xc6U, + 0xe8U, 0xddU, 0x74U, 0x1fU, 0x4bU, 0xbdU, 0x8bU, 0x8aU, + 0x70U, 0x3eU, 0xb5U, 0x66U, 0x48U, 0x03U, 0xf6U, 0x0eU, + 0x61U, 0x35U, 0x57U, 0xb9U, 0x86U, 0xc1U, 0x1dU, 0x9eU, + 0xe1U, 0xf8U, 0x98U, 0x11U, 0x69U, 0xd9U, 0x8eU, 0x94U, + 0x9bU, 0x1eU, 0x87U, 0xe9U, 0xceU, 0x55U, 0x28U, 0xdfU, + 0x8cU, 0xa1U, 0x89U, 0x0dU, 0xbfU, 0xe6U, 0x42U, 0x68U, + 0x41U, 0x99U, 0x2dU, 0x0fU, 0xb0U, 0x54U, 0xbbU, 0x16U +}; +static const u32 rcon[] = { + 0x01000000, 0x02000000, 0x04000000, 0x08000000, + 0x10000000, 0x20000000, 0x40000000, 0x80000000, + 0x1B000000, 0x36000000, /* for 128-bit blocks, Rijndael never uses more than 10 rcon values */ +}; + +/** + * Expand the cipher key into the encryption key schedule. + */ +int AES_set_encrypt_key(const unsigned char *userKey, const int bits, + AES_KEY *key) { + u32 *rk; + int i = 0; + u32 temp; + + if (!userKey || !key) + return -1; + if (bits != 128 && bits != 192 && bits != 256) + return -2; + + rk = key->rd_key; + + if (bits==128) + key->rounds = 10; + else if (bits==192) + key->rounds = 12; + else + key->rounds = 14; + + rk[0] = GETU32(userKey ); + rk[1] = GETU32(userKey + 4); + rk[2] = GETU32(userKey + 8); + rk[3] = GETU32(userKey + 12); + if (bits == 128) { + while (1) { + temp = rk[3]; + rk[4] = rk[0] ^ + (Te4[(temp >> 16) & 0xff] << 24) ^ + (Te4[(temp >> 8) & 0xff] << 16) ^ + (Te4[(temp ) & 0xff] << 8) ^ + (Te4[(temp >> 24) ]) ^ + rcon[i]; + rk[5] = rk[1] ^ rk[4]; + rk[6] = rk[2] ^ rk[5]; + rk[7] = rk[3] ^ rk[6]; + if (++i == 10) { + return 0; + } + rk += 4; + } + } + rk[4] = GETU32(userKey + 16); + rk[5] = GETU32(userKey + 20); + if (bits == 192) { + while (1) { + temp = rk[ 5]; + rk[ 6] = rk[ 0] ^ + (Te4[(temp >> 16) & 0xff] << 24) ^ + (Te4[(temp >> 8) & 0xff] << 16) ^ + (Te4[(temp ) & 0xff] << 8) ^ + (Te4[(temp >> 24) ]) ^ + rcon[i]; + rk[ 7] = rk[ 1] ^ rk[ 6]; + rk[ 8] = rk[ 2] ^ rk[ 7]; + rk[ 9] = rk[ 3] ^ rk[ 8]; + if (++i == 8) { + return 0; + } + rk[10] = rk[ 4] ^ rk[ 9]; + rk[11] = rk[ 5] ^ rk[10]; + rk += 6; + } + } + rk[6] = GETU32(userKey + 24); + rk[7] = GETU32(userKey + 28); + if (bits == 256) { + while (1) { + temp = rk[ 7]; + rk[ 8] = rk[ 0] ^ + (Te4[(temp >> 16) & 0xff] << 24) ^ + (Te4[(temp >> 8) & 0xff] << 16) ^ + (Te4[(temp ) & 0xff] << 8) ^ + (Te4[(temp >> 24) ]) ^ + rcon[i]; + rk[ 9] = rk[ 1] ^ rk[ 8]; + rk[10] = rk[ 2] ^ rk[ 9]; + rk[11] = rk[ 3] ^ rk[10]; + if (++i == 7) { + return 0; + } + temp = rk[11]; + rk[12] = rk[ 4] ^ + (Te4[(temp >> 24) ] << 24) ^ + (Te4[(temp >> 16) & 0xff] << 16) ^ + (Te4[(temp >> 8) & 0xff] << 8) ^ + (Te4[(temp ) & 0xff]); + rk[13] = rk[ 5] ^ rk[12]; + rk[14] = rk[ 6] ^ rk[13]; + rk[15] = rk[ 7] ^ rk[14]; + + rk += 8; + } + } + return 0; +} + +/** + * Expand the cipher key into the decryption key schedule. + */ +int AES_set_decrypt_key(const unsigned char *userKey, const int bits, + AES_KEY *key) { + + u32 *rk; + int i, j, status; + u32 temp; + + /* first, start with an encryption schedule */ + status = AES_set_encrypt_key(userKey, bits, key); + if (status < 0) + return status; + + rk = key->rd_key; + + /* invert the order of the round keys: */ + for (i = 0, j = 4*(key->rounds); i < j; i += 4, j -= 4) { + temp = rk[i ]; rk[i ] = rk[j ]; rk[j ] = temp; + temp = rk[i + 1]; rk[i + 1] = rk[j + 1]; rk[j + 1] = temp; + temp = rk[i + 2]; rk[i + 2] = rk[j + 2]; rk[j + 2] = temp; + temp = rk[i + 3]; rk[i + 3] = rk[j + 3]; rk[j + 3] = temp; + } + /* apply the inverse MixColumn transform to all round keys but the first and the last: */ + for (i = 1; i < (key->rounds); i++) { + rk += 4; + for (j = 0; j < 4; j++) { + u32 tp1, tp2, tp4, tp8, tp9, tpb, tpd, tpe, m; + + tp1 = rk[j]; + m = tp1 & 0x80808080; + tp2 = ((tp1 & 0x7f7f7f7f) << 1) ^ + ((m - (m >> 7)) & 0x1b1b1b1b); + m = tp2 & 0x80808080; + tp4 = ((tp2 & 0x7f7f7f7f) << 1) ^ + ((m - (m >> 7)) & 0x1b1b1b1b); + m = tp4 & 0x80808080; + tp8 = ((tp4 & 0x7f7f7f7f) << 1) ^ + ((m - (m >> 7)) & 0x1b1b1b1b); + tp9 = tp8 ^ tp1; + tpb = tp9 ^ tp2; + tpd = tp9 ^ tp4; + tpe = tp8 ^ tp4 ^ tp2; +#if defined(ROTATE) + rk[j] = tpe ^ ROTATE(tpd,16) ^ + ROTATE(tp9,24) ^ ROTATE(tpb,8); +#else + rk[j] = tpe ^ (tpd >> 16) ^ (tpd << 16) ^ + (tp9 >> 8) ^ (tp9 << 24) ^ + (tpb >> 24) ^ (tpb << 8); +#endif + } + } + return 0; +} + #endif /* AES_ASM */ |