crypto aes ecb 加密解密算法c語言實現

crypto_aes.c

//******************************************************************************
#include "crypto_aes.h"
#include "crypto_common.h"

#define AES_ENCRYPT     0
#define AES_DECRYPT     1

static MS_U8 Key[0x10]={ add key yourself}

/**
 * \brief          AES context structure
 */
typedef struct
{
    int nr;                     /*!<  number of rounds  */
    unsigned long *rk;          /*!<  AES round keys    */
    unsigned long buf[68];      /*!<  unaligned data    */
}
aes_context;

/*
 * 32-bit integer manipulation macros (little endian)
 */
#ifndef GET_ULONG_LE
#define GET_ULONG_LE(n,b,i)                             \
{                                                       \
    (n) = ( (unsigned long) (b)[(i)    ]       )        \
        | ( (unsigned long) (b)[(i) + 1] <<  8 )        \
        | ( (unsigned long) (b)[(i) + 2] << 16 )        \
        | ( (unsigned long) (b)[(i) + 3] << 24 );       \
}
#endif

#ifndef PUT_ULONG_LE
#define PUT_ULONG_LE(n,b,i)                             \
{                                                       \
    (b)[(i)    ] = (unsigned char) ( (n)       );       \
    (b)[(i) + 1] = (unsigned char) ( (n) >>  8 );       \
    (b)[(i) + 2] = (unsigned char) ( (n) >> 16 );       \
    (b)[(i) + 3] = (unsigned char) ( (n) >> 24 );       \
}
#endif

/*
 * Forward S-box & tables
 */
static unsigned char FSb[256];
static unsigned long FT0[256];
static unsigned long FT1[256];
static unsigned long FT2[256];
static unsigned long FT3[256];

/*
 * Reverse S-box & tables
 */
static unsigned char RSb[256];
static unsigned long RT0[256];
static unsigned long RT1[256];
static unsigned long RT2[256];
static unsigned long RT3[256];

/*
 * Round constants
 */
static unsigned long RCON[10];

/*
 * Tables generation code
 */
#define ROTL8(x) ( ( x << 8 ) & 0xFFFFFFFF ) | ( x >> 24 )
#define XTIME(x) ( ( x << 1 ) ^ ( ( x & 0x80 ) ? 0x1B : 0x00 ) )
#define MUL(x,y) ( ( x && y ) ? pow[(log[x]+log[y]) % 255] : 0 )

static int aes_init_done = 0;

static void aes_gen_tables( void )
{
    int i, x, y, z;
    int pow[256];
    int log[256];

    /*
     * compute pow and log tables over GF(2^8)
     */
    for ( i = 0, x = 1; i < 256; i++ ) {
        pow[i] = x;
        log[x] = i;
        x = ( x ^ XTIME( x ) ) & 0xFF;
    }

    /*
     * calculate the round constants
     */
    for ( i = 0, x = 1; i < 10; i++ ) {
        RCON[i] = (unsigned long) x;
        x = XTIME( x ) & 0xFF;
    }

    /*
     * generate the forward and reverse S-boxes
     */

    FSb[0x00] = 0x63;
    RSb[0x63] = 0x00;

    for ( i = 1; i < 256; i++ ) {
        x = pow[255 - log[i]];

        y  = x; y = ( (y << 1) | (y >> 7) ) & 0xFF;
        x ^= y; y = ( (y << 1) | (y >> 7) ) & 0xFF;
        x ^= y; y = ( (y << 1) | (y >> 7) ) & 0xFF;
        x ^= y; y = ( (y << 1) | (y >> 7) ) & 0xFF;
        x ^= y ^ 0x63;

        FSb[i] = (unsigned char) x;
        RSb[x] = (unsigned char) i;
    }

    /*
     * generate the forward and reverse tables
     */
    for ( i = 0; i < 256; i++ ) {
        x = FSb[i];
        y = XTIME( x ) & 0xFF;
        z =  ( y ^ x ) & 0xFF;

        FT0[i] = ( (unsigned long) y       ) ^
                 ( (unsigned long) x <<  8 ) ^
                 ( (unsigned long) x << 16 ) ^
                 ( (unsigned long) z << 24 );

        FT1[i] = ROTL8( FT0[i] );
        FT2[i] = ROTL8( FT1[i] );
        FT3[i] = ROTL8( FT2[i] );

        x = RSb[i];

        RT0[i] = ( (unsigned long) MUL( 0x0E, x )       ) ^
                 ( (unsigned long) MUL( 0x09, x ) <<  8 ) ^
                 ( (unsigned long) MUL( 0x0D, x ) << 16 ) ^
                 ( (unsigned long) MUL( 0x0B, x ) << 24 );

        RT1[i] = ROTL8( RT0[i] );
        RT2[i] = ROTL8( RT1[i] );
        RT3[i] = ROTL8( RT2[i] );
    }
}

/*
 * AES key schedule (encryption)
 */
static void aes_setkey_enc( aes_context *ctx, unsigned char *key, int keysize )
{
    int i;
    unsigned long *RK;

    if ( aes_init_done == 0 ) {
        aes_gen_tables();
        aes_init_done = 1;
    }

    switch ( keysize ) {
        case 128: ctx->nr = 10; break;
        case 192: ctx->nr = 12; break;
        case 256: ctx->nr = 14; break;
        default : return;
    }

    ctx->rk = RK = ctx->buf;

    for ( i = 0; i < (keysize >> 5); i++ ) {
        GET_ULONG_LE( RK[i], key, i << 2 );
    }

    switch ( ctx->nr ) {
        case 10:

            for ( i = 0; i < 10; i++, RK += 4 ) {
                RK[4]  = RK[0] ^ RCON[i] ^
                    ( FSb[ ( RK[3] >>  8 ) & 0xFF ]       ) ^
                    ( FSb[ ( RK[3] >> 16 ) & 0xFF ] <<  8 ) ^
                    ( FSb[ ( RK[3] >> 24 ) & 0xFF ] << 16 ) ^
                    ( FSb[ ( RK[3]       ) & 0xFF ] << 24 );

                RK[5]  = RK[1] ^ RK[4];
                RK[6]  = RK[2] ^ RK[5];
                RK[7]  = RK[3] ^ RK[6];
            }
            break;

        case 12:

            for ( i = 0; i < 8; i++, RK += 6 ) {
                RK[6]  = RK[0] ^ RCON[i] ^
                    ( FSb[ ( RK[5] >>  8 ) & 0xFF ]       ) ^
                    ( FSb[ ( RK[5] >> 16 ) & 0xFF ] <<  8 ) ^
                    ( FSb[ ( RK[5] >> 24 ) & 0xFF ] << 16 ) ^
                    ( FSb[ ( RK[5]       ) & 0xFF ] << 24 );

                RK[7]  = RK[1] ^ RK[6];
                RK[8]  = RK[2] ^ RK[7];
                RK[9]  = RK[3] ^ RK[8];
                RK[10] = RK[4] ^ RK[9];
                RK[11] = RK[5] ^ RK[10];
            }
            break;

        case 14:

            for ( i = 0; i < 7; i++, RK += 8 ) {
                RK[8]  = RK[0] ^ RCON[i] ^
                    ( FSb[ ( RK[7] >>  8 ) & 0xFF ]       ) ^
                    ( FSb[ ( RK[7] >> 16 ) & 0xFF ] <<  8 ) ^
                    ( FSb[ ( RK[7] >> 24 ) & 0xFF ] << 16 ) ^
                    ( FSb[ ( RK[7]       ) & 0xFF ] << 24 );

                RK[9]  = RK[1] ^ RK[8];
                RK[10] = RK[2] ^ RK[9];
                RK[11] = RK[3] ^ RK[10];

                RK[12] = RK[4] ^
                    ( FSb[ ( RK[11]       ) & 0xFF ]       ) ^
                    ( FSb[ ( RK[11] >>  8 ) & 0xFF ] <<  8 ) ^
                    ( FSb[ ( RK[11] >> 16 ) & 0xFF ] << 16 ) ^
                    ( FSb[ ( RK[11] >> 24 ) & 0xFF ] << 24 );

                RK[13] = RK[5] ^ RK[12];
                RK[14] = RK[6] ^ RK[13];
                RK[15] = RK[7] ^ RK[14];
            }
            break;

        default:

            break;
    }
}

/*
 * AES key schedule (decryption)
 */
static void aes_setkey_dec( aes_context *ctx, unsigned char *key, int keysize )
{
    int i, j;
    aes_context cty;
    unsigned long *RK;
    unsigned long *SK;

    switch ( keysize ) {
        case 128: ctx->nr = 10; break;
        case 192: ctx->nr = 12; break;
        case 256: ctx->nr = 14; break;
        default : return;
    }

    ctx->rk = RK = ctx->buf;

    aes_setkey_enc( &cty, key, keysize );
    SK = cty.rk + cty.nr * 4;

    *RK++ = *SK++;
    *RK++ = *SK++;
    *RK++ = *SK++;
    *RK++ = *SK++;

    for ( i = ctx->nr, SK -= 8; i > 1; i--, SK -= 8 ) {
        for ( j = 0; j < 4; j++, SK++ ) {
            *RK++ = RT0[ FSb[ ( *SK       ) & 0xFF ] ] ^
                    RT1[ FSb[ ( *SK >>  8 ) & 0xFF ] ] ^
                    RT2[ FSb[ ( *SK >> 16 ) & 0xFF ] ] ^
                    RT3[ FSb[ ( *SK >> 24 ) & 0xFF ] ];
        }
    }

    *RK++ = *SK++;
    *RK++ = *SK++;
    *RK++ = *SK++;
    *RK++ = *SK++;

    memset( &cty, 0, sizeof( aes_context ) );
}

#define AES_FROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3)     \
{                                               \
    X0 = *RK++ ^ FT0[ ( Y0       ) & 0xFF ] ^   \
                 FT1[ ( Y1 >>  8 ) & 0xFF ] ^   \
                 FT2[ ( Y2 >> 16 ) & 0xFF ] ^   \
                 FT3[ ( Y3 >> 24 ) & 0xFF ];    \
                                                \
    X1 = *RK++ ^ FT0[ ( Y1       ) & 0xFF ] ^   \
                 FT1[ ( Y2 >>  8 ) & 0xFF ] ^   \
                 FT2[ ( Y3 >> 16 ) & 0xFF ] ^   \
                 FT3[ ( Y0 >> 24 ) & 0xFF ];    \
                                                \
    X2 = *RK++ ^ FT0[ ( Y2       ) & 0xFF ] ^   \
                 FT1[ ( Y3 >>  8 ) & 0xFF ] ^   \
                 FT2[ ( Y0 >> 16 ) & 0xFF ] ^   \
                 FT3[ ( Y1 >> 24 ) & 0xFF ];    \
                                                \
    X3 = *RK++ ^ FT0[ ( Y3       ) & 0xFF ] ^   \
                 FT1[ ( Y0 >>  8 ) & 0xFF ] ^   \
                 FT2[ ( Y1 >> 16 ) & 0xFF ] ^   \
                 FT3[ ( Y2 >> 24 ) & 0xFF ];    \
}

#define AES_RROUND(X0,X1,X2,X3,Y0,Y1,Y2,Y3)     \
{                                               \
    X0 = *RK++ ^ RT0[ ( Y0       ) & 0xFF ] ^   \
                 RT1[ ( Y3 >>  8 ) & 0xFF ] ^   \
                 RT2[ ( Y2 >> 16 ) & 0xFF ] ^   \
                 RT3[ ( Y1 >> 24 ) & 0xFF ];    \
                                                \
    X1 = *RK++ ^ RT0[ ( Y1       ) & 0xFF ] ^   \
                 RT1[ ( Y0 >>  8 ) & 0xFF ] ^   \
                 RT2[ ( Y3 >> 16 ) & 0xFF ] ^   \
                 RT3[ ( Y2 >> 24 ) & 0xFF ];    \
                                                \
    X2 = *RK++ ^ RT0[ ( Y2       ) & 0xFF ] ^   \
                 RT1[ ( Y1 >>  8 ) & 0xFF ] ^   \
                 RT2[ ( Y0 >> 16 ) & 0xFF ] ^   \
                 RT3[ ( Y3 >> 24 ) & 0xFF ];    \
                                                \
    X3 = *RK++ ^ RT0[ ( Y3       ) & 0xFF ] ^   \
                 RT1[ ( Y2 >>  8 ) & 0xFF ] ^   \
                 RT2[ ( Y1 >> 16 ) & 0xFF ] ^   \
                 RT3[ ( Y0 >> 24 ) & 0xFF ];    \
}

/*
 * AES-ECB block encryption/decryption
 */
static void aes_crypt_ecb( aes_context *ctx,
                    int mode,
                    unsigned char input[16],
                    unsigned char output[16] )
{
    int i;
    unsigned long *RK, X0, X1, X2, X3, Y0, Y1, Y2, Y3;

    RK = ctx->rk;

    GET_ULONG_LE( X0, input,  0 ); X0 ^= *RK++;
    GET_ULONG_LE( X1, input,  4 ); X1 ^= *RK++;
    GET_ULONG_LE( X2, input,  8 ); X2 ^= *RK++;
    GET_ULONG_LE( X3, input, 12 ); X3 ^= *RK++;

    if ( mode == AES_ENCRYPT ) {
        for ( i = (ctx->nr >> 1); i > 1; i-- ) {
            AES_FROUND( Y0, Y1, Y2, Y3, X0, X1, X2, X3 );
            AES_FROUND( X0, X1, X2, X3, Y0, Y1, Y2, Y3 );
        }

        AES_FROUND( Y0, Y1, Y2, Y3, X0, X1, X2, X3 );

        X0 = *RK++ ^ ( FSb[ ( Y0       ) & 0xFF ]       ) ^
                     ( FSb[ ( Y1 >>  8 ) & 0xFF ] <<  8 ) ^
                     ( FSb[ ( Y2 >> 16 ) & 0xFF ] << 16 ) ^
                     ( FSb[ ( Y3 >> 24 ) & 0xFF ] << 24 );

        X1 = *RK++ ^ ( FSb[ ( Y1       ) & 0xFF ]       ) ^
                     ( FSb[ ( Y2 >>  8 ) & 0xFF ] <<  8 ) ^
                     ( FSb[ ( Y3 >> 16 ) & 0xFF ] << 16 ) ^
                     ( FSb[ ( Y0 >> 24 ) & 0xFF ] << 24 );

        X2 = *RK++ ^ ( FSb[ ( Y2       ) & 0xFF ]       ) ^
                     ( FSb[ ( Y3 >>  8 ) & 0xFF ] <<  8 ) ^
                     ( FSb[ ( Y0 >> 16 ) & 0xFF ] << 16 ) ^
                     ( FSb[ ( Y1 >> 24 ) & 0xFF ] << 24 );

        X3 = *RK++ ^ ( FSb[ ( Y3       ) & 0xFF ]       ) ^
                     ( FSb[ ( Y0 >>  8 ) & 0xFF ] <<  8 ) ^
                     ( FSb[ ( Y1 >> 16 ) & 0xFF ] << 16 ) ^
                     ( FSb[ ( Y2 >> 24 ) & 0xFF ] << 24 );
    }else {

        /* AES_DECRYPT */
        for ( i = (ctx->nr >> 1); i > 1; i-- ) {
            AES_RROUND( Y0, Y1, Y2, Y3, X0, X1, X2, X3 );
            AES_RROUND( X0, X1, X2, X3, Y0, Y1, Y2, Y3 );
        }

        AES_RROUND( Y0, Y1, Y2, Y3, X0, X1, X2, X3 );

        X0 = *RK++ ^ ( RSb[ ( Y0       ) & 0xFF ]       ) ^
                     ( RSb[ ( Y3 >>  8 ) & 0xFF ] <<  8 ) ^
                     ( RSb[ ( Y2 >> 16 ) & 0xFF ] << 16 ) ^
                     ( RSb[ ( Y1 >> 24 ) & 0xFF ] << 24 );

        X1 = *RK++ ^ ( RSb[ ( Y1       ) & 0xFF ]       ) ^
                     ( RSb[ ( Y0 >>  8 ) & 0xFF ] <<  8 ) ^
                     ( RSb[ ( Y3 >> 16 ) & 0xFF ] << 16 ) ^
                     ( RSb[ ( Y2 >> 24 ) & 0xFF ] << 24 );

        X2 = *RK++ ^ ( RSb[ ( Y2       ) & 0xFF ]       ) ^
                     ( RSb[ ( Y1 >>  8 ) & 0xFF ] <<  8 ) ^
                     ( RSb[ ( Y0 >> 16 ) & 0xFF ] << 16 ) ^
                     ( RSb[ ( Y3 >> 24 ) & 0xFF ] << 24 );

        X3 = *RK++ ^ ( RSb[ ( Y3       ) & 0xFF ]       ) ^
                     ( RSb[ ( Y2 >>  8 ) & 0xFF ] <<  8 ) ^
                     ( RSb[ ( Y1 >> 16 ) & 0xFF ] << 16 ) ^
                     ( RSb[ ( Y0 >> 24 ) & 0xFF ] << 24 );

    }

    PUT_ULONG_LE( X0, output,  0 );
    PUT_ULONG_LE( X1, output,  4 );
    PUT_ULONG_LE( X2, output,  8 );
    PUT_ULONG_LE( X3, output, 12 );
}

static int AES_ECB_Decrypt(MS_U32 u32Addr, MS_U32 u32Len, MS_U8 *bKey)
{
    DEBUG("IN\n");
    if (0 != u32Len%16) {
         DEBUG("u32InLen should align 16\n");
         return -1;
    }
    aes_context aes_ctx;
    memset(&aes_ctx, 0, sizeof(aes_context));
        DEBUG("Use SW EFUSE Key\n");
        aes_setkey_dec( &aes_ctx, Key, 128 );
    int offset;
    unsigned char *ptr = (unsigned char*)u32Addr;
    for( offset = 0; offset < u32Len; offset += 16 ) {
        aes_crypt_ecb( &aes_ctx, AES_DECRYPT, ptr, ptr );
        ptr += 16;
    }
    DEBUG("OK\n");
    return 0;
}

static int AES_ECB_Encrypt(MS_U32 u32Addr, MS_U32 u32Len, MS_U8 *bKey)
{
    DEBUG("IN\n");
    if (0 != u32Len%16) {
         DEBUG("u32InLen should align 16\n");
         return -1;
    }
    aes_context aes_ctx;
    memset(&aes_ctx, 0,sizeof(aes_context));
        // use hwKey to handle CustomerKeyBank
        DEBUG("Use SW EFUSE Key\n");
        aes_setkey_enc( &aes_ctx, Key, 128 );
    int offset;
    unsigned char *ptr = (unsigned char*)u32Addr;

    for ( offset = 0; offset < u32Len; offset += 16 ) {
        aes_crypt_ecb( &aes_ctx, AES_ENCRYPT, ptr, ptr );
        ptr += 16;
    }
    DEBUG("OK\n");
    return 0;
}