sshaes.c

来自「远程登陆工具软件源码 用于远程登陆unix」· C语言 代码 · 共 1,215 行 · 第 1/4 页

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};

/*
 * Common macros in both the encryption and decryption routines.
 */
#define ADD_ROUND_KEY_4 (block[0]^=*keysched++, block[1]^=*keysched++, \
		         block[2]^=*keysched++, block[3]^=*keysched++)
#define ADD_ROUND_KEY_6 (block[0]^=*keysched++, block[1]^=*keysched++, \
		         block[2]^=*keysched++, block[3]^=*keysched++, \
		         block[4]^=*keysched++, block[5]^=*keysched++)
#define ADD_ROUND_KEY_8 (block[0]^=*keysched++, block[1]^=*keysched++, \
		         block[2]^=*keysched++, block[3]^=*keysched++, \
		         block[4]^=*keysched++, block[5]^=*keysched++, \
		         block[6]^=*keysched++, block[7]^=*keysched++)
#define MOVEWORD(i) ( block[i] = newstate[i] )

/*
 * Macros for the encryption routine. There are three encryption
 * cores, for Nb=4,6,8.
 */
#define MAKEWORD(i) ( newstate[i] = (E0[(block[i] >> 24) & 0xFF] ^ \
				     E1[(block[(i+C1)%Nb] >> 16) & 0xFF] ^ \
				     E2[(block[(i+C2)%Nb] >> 8) & 0xFF] ^ \
				     E3[block[(i+C3)%Nb] & 0xFF]) )
#define LASTWORD(i) ( newstate[i] = (Sbox[(block[i] >> 24) & 0xFF] << 24) | \
			    (Sbox[(block[(i+C1)%Nb] >> 16) & 0xFF] << 16) | \
			    (Sbox[(block[(i+C2)%Nb] >>  8) & 0xFF] <<  8) | \
			    (Sbox[(block[(i+C3)%Nb]      ) & 0xFF]      ) )

/*
 * Core encrypt routines, expecting word32 inputs read big-endian
 * from the byte-oriented input stream.
 */
static void aes_encrypt_nb_4(AESContext * ctx, word32 * block)
{
    int i;
    static const int C1 = 1, C2 = 2, C3 = 3, Nb = 4;
    word32 *keysched = ctx->keysched;
    word32 newstate[4];
    for (i = 0; i < ctx->Nr - 1; i++) {
	ADD_ROUND_KEY_4;
	MAKEWORD(0);
	MAKEWORD(1);
	MAKEWORD(2);
	MAKEWORD(3);
	MOVEWORD(0);
	MOVEWORD(1);
	MOVEWORD(2);
	MOVEWORD(3);
    }
    ADD_ROUND_KEY_4;
    LASTWORD(0);
    LASTWORD(1);
    LASTWORD(2);
    LASTWORD(3);
    MOVEWORD(0);
    MOVEWORD(1);
    MOVEWORD(2);
    MOVEWORD(3);
    ADD_ROUND_KEY_4;
}
static void aes_encrypt_nb_6(AESContext * ctx, word32 * block)
{
    int i;
    static const int C1 = 1, C2 = 2, C3 = 3, Nb = 6;
    word32 *keysched = ctx->keysched;
    word32 newstate[6];
    for (i = 0; i < ctx->Nr - 1; i++) {
	ADD_ROUND_KEY_6;
	MAKEWORD(0);
	MAKEWORD(1);
	MAKEWORD(2);
	MAKEWORD(3);
	MAKEWORD(4);
	MAKEWORD(5);
	MOVEWORD(0);
	MOVEWORD(1);
	MOVEWORD(2);
	MOVEWORD(3);
	MOVEWORD(4);
	MOVEWORD(5);
    }
    ADD_ROUND_KEY_6;
    LASTWORD(0);
    LASTWORD(1);
    LASTWORD(2);
    LASTWORD(3);
    LASTWORD(4);
    LASTWORD(5);
    MOVEWORD(0);
    MOVEWORD(1);
    MOVEWORD(2);
    MOVEWORD(3);
    MOVEWORD(4);
    MOVEWORD(5);
    ADD_ROUND_KEY_6;
}
static void aes_encrypt_nb_8(AESContext * ctx, word32 * block)
{
    int i;
    static const int C1 = 1, C2 = 3, C3 = 4, Nb = 8;
    word32 *keysched = ctx->keysched;
    word32 newstate[8];
    for (i = 0; i < ctx->Nr - 1; i++) {
	ADD_ROUND_KEY_8;
	MAKEWORD(0);
	MAKEWORD(1);
	MAKEWORD(2);
	MAKEWORD(3);
	MAKEWORD(4);
	MAKEWORD(5);
	MAKEWORD(6);
	MAKEWORD(7);
	MOVEWORD(0);
	MOVEWORD(1);
	MOVEWORD(2);
	MOVEWORD(3);
	MOVEWORD(4);
	MOVEWORD(5);
	MOVEWORD(6);
	MOVEWORD(7);
    }
    ADD_ROUND_KEY_8;
    LASTWORD(0);
    LASTWORD(1);
    LASTWORD(2);
    LASTWORD(3);
    LASTWORD(4);
    LASTWORD(5);
    LASTWORD(6);
    LASTWORD(7);
    MOVEWORD(0);
    MOVEWORD(1);
    MOVEWORD(2);
    MOVEWORD(3);
    MOVEWORD(4);
    MOVEWORD(5);
    MOVEWORD(6);
    MOVEWORD(7);
    ADD_ROUND_KEY_8;
}

#undef MAKEWORD
#undef LASTWORD

/*
 * Macros for the decryption routine. There are three decryption
 * cores, for Nb=4,6,8.
 */
#define MAKEWORD(i) ( newstate[i] = (D0[(block[i] >> 24) & 0xFF] ^ \
				     D1[(block[(i+C1)%Nb] >> 16) & 0xFF] ^ \
				     D2[(block[(i+C2)%Nb] >> 8) & 0xFF] ^ \
				     D3[block[(i+C3)%Nb] & 0xFF]) )
#define LASTWORD(i) (newstate[i] = (Sboxinv[(block[i] >> 24) & 0xFF] << 24) | \
			   (Sboxinv[(block[(i+C1)%Nb] >> 16) & 0xFF] << 16) | \
			   (Sboxinv[(block[(i+C2)%Nb] >>  8) & 0xFF] <<  8) | \
			   (Sboxinv[(block[(i+C3)%Nb]      ) & 0xFF]      ) )

/*
 * Core decrypt routines, expecting word32 inputs read big-endian
 * from the byte-oriented input stream.
 */
static void aes_decrypt_nb_4(AESContext * ctx, word32 * block)
{
    int i;
    static const int C1 = 4 - 1, C2 = 4 - 2, C3 = 4 - 3, Nb = 4;
    word32 *keysched = ctx->invkeysched;
    word32 newstate[4];
    for (i = 0; i < ctx->Nr - 1; i++) {
	ADD_ROUND_KEY_4;
	MAKEWORD(0);
	MAKEWORD(1);
	MAKEWORD(2);
	MAKEWORD(3);
	MOVEWORD(0);
	MOVEWORD(1);
	MOVEWORD(2);
	MOVEWORD(3);
    }
    ADD_ROUND_KEY_4;
    LASTWORD(0);
    LASTWORD(1);
    LASTWORD(2);
    LASTWORD(3);
    MOVEWORD(0);
    MOVEWORD(1);
    MOVEWORD(2);
    MOVEWORD(3);
    ADD_ROUND_KEY_4;
}
static void aes_decrypt_nb_6(AESContext * ctx, word32 * block)
{
    int i;
    static const int C1 = 6 - 1, C2 = 6 - 2, C3 = 6 - 3, Nb = 6;
    word32 *keysched = ctx->invkeysched;
    word32 newstate[6];
    for (i = 0; i < ctx->Nr - 1; i++) {
	ADD_ROUND_KEY_6;
	MAKEWORD(0);
	MAKEWORD(1);
	MAKEWORD(2);
	MAKEWORD(3);
	MAKEWORD(4);
	MAKEWORD(5);
	MOVEWORD(0);
	MOVEWORD(1);
	MOVEWORD(2);
	MOVEWORD(3);
	MOVEWORD(4);
	MOVEWORD(5);
    }
    ADD_ROUND_KEY_6;
    LASTWORD(0);
    LASTWORD(1);
    LASTWORD(2);
    LASTWORD(3);
    LASTWORD(4);
    LASTWORD(5);
    MOVEWORD(0);
    MOVEWORD(1);
    MOVEWORD(2);
    MOVEWORD(3);
    MOVEWORD(4);
    MOVEWORD(5);
    ADD_ROUND_KEY_6;
}
static void aes_decrypt_nb_8(AESContext * ctx, word32 * block)
{
    int i;
    static const int C1 = 8 - 1, C2 = 8 - 3, C3 = 8 - 4, Nb = 8;
    word32 *keysched = ctx->invkeysched;
    word32 newstate[8];
    for (i = 0; i < ctx->Nr - 1; i++) {
	ADD_ROUND_KEY_8;
	MAKEWORD(0);
	MAKEWORD(1);
	MAKEWORD(2);
	MAKEWORD(3);
	MAKEWORD(4);
	MAKEWORD(5);
	MAKEWORD(6);
	MAKEWORD(7);
	MOVEWORD(0);
	MOVEWORD(1);
	MOVEWORD(2);
	MOVEWORD(3);
	MOVEWORD(4);
	MOVEWORD(5);
	MOVEWORD(6);
	MOVEWORD(7);
    }
    ADD_ROUND_KEY_8;