crypto_rot.c File Reference

#include <rz_lib.h>
#include <rz_crypto.h>
#include <rz_util.h>

Go to the source code of this file.

Functions
int	mod (int a, int b)
static bool	rot_init_state (ut8 *rotkey, const ut8 *key, int keylen)
static void	rot_crypt (ut8 key, const ut8 *inbuf, ut8 *outbuf, int buflen)
static void	rot_decrypt (ut8 key, const ut8 *inbuf, ut8 *outbuf, int buflen)
static bool	rot_set_key (RzCrypto *cry, const ut8 *key, int keylen, int mode, int direction)
static int	rot_get_key_size (RzCrypto *cry)
static bool	rot_use (const char *algo)
static bool	update (RzCrypto *cry, const ut8 *buf, int len)
static bool	final (RzCrypto *cry, const ut8 *buf, int len)
static bool	rol_init (RzCrypto *cry)
static bool	rol_fini (RzCrypto *cry)

Variables
RzCryptoPlugin	rz_crypto_plugin_rot
RZ_API RzLibStruct	rizin_plugin

Function Documentation

final()

static bool final ( RzCrypto *  cry, const ut8 *  buf, int  len  )

static

Definition at line 97 of file crypto_rot.c.

                                                          {
    return update(cry, buf, len);
}

References len, and update().

mod()

int mod	(	int	a,
		int	b
	)

Definition at line 8 of file crypto_rot.c.

                      {
    if (b < 0) {
        return mod(-a, -b);
    }
    int ret = a % b;
    if (ret < 0) {
        ret += b;
    }
    return ret;
}

References a, and b.

Referenced by align_upper(), d_print_comp_inner(), d_print_mod(), dmp_get_modules(), ds_print_asmop_payload(), filter(), get_dispatchmessage_offset(), opcall(), opdec(), opinc(), oplea(), oples(), opmov(), oppop(), oppush(), opset(), parse_type_modifier(), print_addr(), proc_mem_img(), rot_crypt(), rot_decrypt(), rot_init_state(), rz_asm_disassemble(), rz_bv_set_all(), rz_core_magic_at(), rz_debug_dmp_init(), rz_debug_dmp_modules(), rz_debug_winkd_attach(), rz_debug_winkd_modules(), rz_file_chmod(), rz_il_op_new_mod(), rz_il_op_pure_dup(), rz_il_op_pure_free(), rz_rand(), sdb_uncat(), set_mod_inf(), windbg_map_get(), windbg_modules_get(), winkd_list_modules(), and winkd_windmodule_free().

rol_fini()

static bool rol_fini ( RzCrypto *  cry )

static

Definition at line 108 of file crypto_rot.c.

                                    {
    rz_return_val_if_fail(cry, false);
 
    free(cry->user);
    return true;
}

References free(), rz_return_val_if_fail, and rz_crypto_t::user.

rol_init()

static bool rol_init ( RzCrypto *  cry )

static

Definition at line 101 of file crypto_rot.c.

                                    {
    rz_return_val_if_fail(cry, false);
 
    cry->user = RZ_NEW0(ut8);
    return cry->user != NULL;
}

References NULL, RZ_NEW0, rz_return_val_if_fail, and rz_crypto_t::user.

rot_crypt()

static void rot_crypt ( ut8  key, const ut8 *  inbuf, ut8 *  outbuf, int  buflen  )

static

Definition at line 28 of file crypto_rot.c.

                                                                          {
    int i;
    for (i = 0; i < buflen; i++) {
        outbuf[i] = inbuf[i];
        if ((inbuf[i] < 'a' || inbuf[i] > 'z') && (inbuf[i] < 'A' || inbuf[i] > 'Z')) {
            continue;
        }
        outbuf[i] += key;
        outbuf[i] -= (inbuf[i] >= 'a' && inbuf[i] <= 'z') ? 'a' : 'A';
        outbuf[i] = mod(outbuf[i], 26);
        outbuf[i] += (inbuf[i] >= 'a' && inbuf[i] <= 'z') ? 'a' : 'A';
    }
}

References buflen, i, inbuf, key, mod(), and outbuf.

Referenced by update().

rot_decrypt()

static void rot_decrypt ( ut8  key, const ut8 *  inbuf, ut8 *  outbuf, int  buflen  )

static

Definition at line 42 of file crypto_rot.c.

                                                                            {
    int i;
    for (i = 0; i < buflen; i++) {
        outbuf[i] = inbuf[i];
        if ((inbuf[i] < 'a' || inbuf[i] > 'z') && (inbuf[i] < 'A' || inbuf[i] > 'Z')) {
            continue;
        }
        outbuf[i] += 26; // adding so that subtracting does not make it negative
        outbuf[i] -= key;
        outbuf[i] -= (inbuf[i] >= 'a' && inbuf[i] <= 'z') ? 'a' : 'A';
        outbuf[i] = mod(outbuf[i], 26);
        outbuf[i] += (inbuf[i] >= 'a' && inbuf[i] <= 'z') ? 'a' : 'A';
    }
}

References buflen, i, inbuf, key, mod(), and outbuf.

Referenced by update().

rot_get_key_size()

static int rot_get_key_size ( RzCrypto *  cry )

static

Definition at line 70 of file crypto_rot.c.

                                           {
    // Returning number of bytes occupied by ut8
    return 1;
}

rot_init_state()

static bool rot_init_state ( ut8 *  rotkey, const ut8 *  key, int  keylen  )

static

Definition at line 19 of file crypto_rot.c.

                                                                    {
    if (rotkey && key && keylen > 0) {
        int i = atoi((const char *)key);
        *rotkey = (ut8)mod(i, 26);
        return true;
    }
    return false;
}

References i, key, mod(), and ut8.

Referenced by rot_set_key().

rot_set_key()

static bool rot_set_key ( RzCrypto *  cry, const ut8 *  key, int  keylen, int  mode, int  direction  )

static

Definition at line 57 of file crypto_rot.c.

                                                                                            {
    rz_return_val_if_fail(cry->user && key, false);
    ut8 *rot_key = (ut8 *)cry->user;
 
    if (keylen > (sizeof(ut8) * 8) || keylen < 0) {
        return false;
    }
 
    cry->dir = direction;
 
    return rot_init_state(rot_key, key, keylen);
}

References rz_crypto_t::dir, if(), key, rot_init_state(), rz_return_val_if_fail, and rz_crypto_t::user.

rot_use()

static bool rot_use ( const char *  algo )

static

Definition at line 75 of file crypto_rot.c.

                                      {
    return !strcmp(algo, "rot");
}

update()

static bool update ( RzCrypto *  cry, const ut8 *  buf, int  len  )

static

Definition at line 79 of file crypto_rot.c.

                                                           {
    rz_return_val_if_fail(cry->user, false);
    ut8 *rot_key = (ut8 *)cry->user;
 
    ut8 *obuf = calloc(1, len);
    if (!obuf) {
        return false;
    }
    if (cry->dir == RZ_CRYPTO_DIR_ENCRYPT) {
        rot_crypt(*rot_key, buf, obuf, len);
    } else {
        rot_decrypt(*rot_key, buf, obuf, len);
    }
    rz_crypto_append(cry, obuf, len);
    free(obuf);
    return true;
}

References calloc(), rz_crypto_t::dir, free(), len, obuf, rot_crypt(), rot_decrypt(), rz_crypto_append(), RZ_CRYPTO_DIR_ENCRYPT, rz_return_val_if_fail, and rz_crypto_t::user.

Referenced by final().

Variable Documentation

rizin_plugin

RZ_API RzLibStruct rizin_plugin

Initial value:

= {
    .type = RZ_LIB_TYPE_CRYPTO,
    .data = &rz_crypto_plugin_rot,
    .version = RZ_VERSION
}

Definition at line 129 of file crypto_rot.c.

rz_crypto_plugin_rot

RzCryptoPlugin rz_crypto_plugin_rot

Initial value:

= {
    .name = "rot",
    .author = "pancake",
    .license = "LGPL-3",
    .set_key = rot_set_key,
    .get_key_size = rot_get_key_size,
    .use = rot_use,
    .update = update,
    .final = final,
    .init = rol_init,
    .fini = rol_fini,
}

Definition at line 115 of file crypto_rot.c.