crypto_rc4.c File Reference

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

Go to the source code of this file.

Classes
struct	rc4_state

Functions
static __inline void	swap_bytes (ut8 *a, ut8 *b)
static bool	rc4_init_state (struct rc4_state *const state, const ut8 *key, int keylen)
static void	rc4_crypt (struct rc4_state *const state, const ut8 *inbuf, ut8 *outbuf, int buflen)
static bool	rc4_set_key (RzCrypto *cry, const ut8 *key, int keylen, int mode, int direction)
static int	rc4_get_key_size (RzCrypto *cry)
static bool	rc4_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	rc4_init (RzCrypto *cry)
static bool	rc4_fini (RzCrypto *cry)

Variables
RzCryptoPlugin	rz_crypto_plugin_rc4
RZ_API RzLibStruct	rizin_plugin

Function Documentation

final()

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

static

Definition at line 108 of file crypto_rc4.c.

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

References len, and update().

rc4_crypt()

static void rc4_crypt ( struct rc4_state *const  state, const ut8 *  inbuf, ut8 *  outbuf, int  buflen  )

static

Definition at line 57 of file crypto_rc4.c.

                                                                                                {
    int i;
    ut8 j;
 
    for (i = 0; i < buflen; i++) {
        /* Update modification indices */
        state->index1++;
        state->index2 += state->perm[state->index1];
        /* Modify permutation */
        swap_bytes(&state->perm[state->index1],
            &state->perm[state->index2]);
        /* Encrypt/decrypt next byte */
        j = state->perm[state->index1] + state->perm[state->index2];
        outbuf[i] = inbuf[i] ^ state->perm[j];
    }
}

References buflen, i, inbuf, outbuf, and swap_bytes().

Referenced by update().

rc4_fini()

static bool rc4_fini ( RzCrypto *  cry )

static

Definition at line 119 of file crypto_rc4.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.

rc4_get_key_size()

static int rc4_get_key_size ( RzCrypto *  cry )

static

Definition at line 83 of file crypto_rc4.c.

                                           {
    rz_return_val_if_fail(cry->user, 0);
    struct rc4_state *st = (struct rc4_state *)cry->user;
 
    return st->key_size;
}

References rc4_state::key_size, rz_return_val_if_fail, and rz_crypto_t::user.

rc4_init()

static bool rc4_init ( RzCrypto *  cry )

static

Definition at line 112 of file crypto_rc4.c.

                                    {
    rz_return_val_if_fail(cry, false);
 
    cry->user = RZ_NEW0(struct rc4_state);
    return cry->user != NULL;
}

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

rc4_init_state()

static bool rc4_init_state ( struct rc4_state *const  state, const ut8 *  key, int  keylen  )

static

Definition at line 28 of file crypto_rc4.c.

                                                                                      {
    ut8 j;
    int i;
 
    if (!state || !key || keylen < 1) {
        return false;
    }
    state->key_size = keylen;
    /* Initialize state with identity permutation */
    for (i = 0; i < 256; i++) {
        state->perm[i] = (ut8)i;
    }
    state->index1 = 0;
    state->index2 = 0;
 
    /* Randomize the permutation using key data */
    for (j = i = 0; i < 256; i++) {
        j += state->perm[i] + key[i % keylen];
        swap_bytes(&state->perm[i], &state->perm[j]);
    }
    return true;
}

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

Referenced by rc4_set_key().

rc4_set_key()

static bool rc4_set_key ( RzCrypto *  cry, const ut8 *  key, int  keylen, int  mode, int  direction  )

static

Definition at line 76 of file crypto_rc4.c.

                                                                                            {
    rz_return_val_if_fail(cry->user && key, false);
    struct rc4_state *st = (struct rc4_state *)cry->user;
 
    return rc4_init_state(st, key, keylen);
}

References key, rc4_init_state(), rz_return_val_if_fail, and rz_crypto_t::user.

rc4_use()

static bool rc4_use ( const char *  algo )

static

Definition at line 90 of file crypto_rc4.c.

                                      {
    return !strcmp(algo, "rc4");
}

swap_bytes()

static __inline void swap_bytes ( ut8 *  a, ut8 *  b  )

static

Definition at line 15 of file crypto_rc4.c.

                                                {
    if (a != b) {
        ut8 temp = *a;
        *a = *b;
        *b = temp;
    }
}

References a, and b.

Referenced by rc4_crypt(), and rc4_init_state().

update()

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

static

Definition at line 94 of file crypto_rc4.c.

                                                           {
    rz_return_val_if_fail(cry->user, false);
    struct rc4_state *st = (struct rc4_state *)cry->user;
 
    ut8 *obuf = calloc(1, len);
    if (!obuf) {
        return false;
    }
    rc4_crypt(st, buf, obuf, len);
    rz_crypto_append(cry, obuf, len);
    free(obuf);
    return false;
}

References calloc(), free(), len, obuf, rc4_crypt(), rz_crypto_append(), 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_rc4,
    .version = RZ_VERSION
}

Definition at line 140 of file crypto_rc4.c.

rz_crypto_plugin_rc4

RzCryptoPlugin rz_crypto_plugin_rc4

Initial value:

= {
    .name = "rc4",
    .author = "pancake",
    .license = "LGPL-3",
    .set_key = rc4_set_key,
    .get_key_size = rc4_get_key_size,
    .use = rc4_use,
    .update = update,
    .final = final,
    .init = rc4_init,
    .fini = rc4_fini,
}

Definition at line 126 of file crypto_rc4.c.