crypto_serpent.c File Reference

#include <rz_lib.h>
#include <rz_crypto.h>
#include "crypto_serpent_algo.h"

Go to the source code of this file.

Macros
#define	BLOCK_SIZE   16

Functions
static bool	serpent_set_key (RzCrypto *cry, const ut8 *key, int keylen, int mode, int direction)
static int	serpent_get_key_size (RzCrypto *cry)
static bool	serpent_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	serpent_init (RzCrypto *cry)
static bool	serpent_fini (RzCrypto *cry)

Variables
RzCryptoPlugin	rz_crypto_plugin_serpent
RZ_API RzLibStruct	rizin_plugin

Macro Definition Documentation

BLOCK_SIZE

#define BLOCK_SIZE   16

Definition at line 34 of file crypto_serpent.c.

Function Documentation

final()

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

static

Definition at line 106 of file crypto_serpent.c.

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

References len, and update().

serpent_fini()

static bool serpent_fini ( RzCrypto *  cry )

static

Definition at line 117 of file crypto_serpent.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.

serpent_get_key_size()

static int serpent_get_key_size ( RzCrypto *  cry )

static

Definition at line 23 of file crypto_serpent.c.

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

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

serpent_init()

static bool serpent_init ( RzCrypto *  cry )

static

Definition at line 110 of file crypto_serpent.c.

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

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

serpent_set_key()

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

static

Definition at line 8 of file crypto_serpent.c.

                                                                                                {
    rz_return_val_if_fail(cry->user && key, false);
    serpent_state_t *st = (serpent_state_t *)cry->user;
 
    if ((keylen != 128 / 8) && (keylen != 192 / 8) && (keylen != 256 / 8)) {
        return false;
    }
    st->key_size = keylen * 8;
    for (size_t i = 0; i < keylen / 4; i++) {
        st->key[i] = rz_read_at_le32(key, i * 4);
    }
    cry->dir = direction;
    return true;
}

References rz_crypto_t::dir, i, if(), serpent_state::key, key, serpent_state::key_size, rz_read_at_le32(), rz_return_val_if_fail, and rz_crypto_t::user.

serpent_use()

static bool serpent_use ( const char *  algo )

static

Definition at line 30 of file crypto_serpent.c.

                                          {
    return !strcmp(algo, "serpent-ecb");
}

update()

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

static

Definition at line 36 of file crypto_serpent.c.

                                                           {
    rz_return_val_if_fail(cry->user, 0);
    serpent_state_t *st = (serpent_state_t *)cry->user;
    if (len < 1) {
        return false;
    }
 
    // Pad to the block size, do not append dummy block
    const int diff = (BLOCK_SIZE - (len % BLOCK_SIZE)) % BLOCK_SIZE;
    const int size = len + diff;
    const int blocks = size / BLOCK_SIZE;
    int i, j;
 
    ut8 *const obuf = calloc(4, size / 4);
    if (!obuf) {
        return false;
    }
    ut32 *const ibuf = calloc(4, size / 4);
    if (!ibuf) {
        free(obuf);
        return false;
    }
    ut32 *const tmp = calloc(4, size / 4);
    if (!tmp) {
        free(obuf);
        free(ibuf);
        return false;
    }
 
    // Construct ut32 blocks from byte stream
    for (j = 0; j < len / 4; j++) {
        ibuf[j] = rz_read_le32(buf + 4 * j);
    }
    if (len & 0x3) {
        ut8 tail[4] = { 0 }; // Zero padding
        memcpy(tail, buf + (len & ~0x3), len & 0x3);
        ibuf[len / 4] = rz_read_le32(tail);
    }
 
    if (cry->dir == RZ_CRYPTO_DIR_ENCRYPT) {
        for (i = 0; i < blocks; i++) {
            // delta in number of ut32
            const int delta = (BLOCK_SIZE * i) / 4;
            serpent_encrypt(st, ibuf + delta, tmp + delta);
        }
    } else {
        for (i = 0; i < blocks; i++) {
            // delta in number of ut32
            const int delta = (BLOCK_SIZE * i) / 4;
            serpent_decrypt(st, ibuf + delta, tmp + delta);
        }
    }
 
    // Construct ut32 blocks from byte stream
    int k;
    for (j = 0; j < size / 4; j++) {
        k = 4 * j;
        obuf[k] = tmp[j] & 0xff;
        obuf[k + 1] = (tmp[j] >> 8) & 0xff;
        obuf[k + 2] = (tmp[j] >> 16) & 0xff;
        obuf[k + 3] = (tmp[j] >> 24) & 0xff;
    }
 
    rz_crypto_append(cry, obuf, size);
    free(obuf);
    free(ibuf);
    free(tmp);
    return true;
}

References BLOCK_SIZE, blocks, calloc(), delta, rz_crypto_t::dir, free(), i, if(), k, len, memcpy(), obuf, rz_crypto_append(), RZ_CRYPTO_DIR_ENCRYPT, rz_read_le32(), rz_return_val_if_fail, serpent_decrypt(), serpent_encrypt(), autogen_x86imm::tmp, 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_serpent,
    .version = RZ_VERSION
}

Definition at line 138 of file crypto_serpent.c.

rz_crypto_plugin_serpent

RzCryptoPlugin rz_crypto_plugin_serpent

Initial value:

= {
    .name = "serpent-ecb",
    .author = "NicsTr",
    .license = "LGPL-3",
    .set_key = serpent_set_key,
    .get_key_size = serpent_get_key_size,
    .use = serpent_use,
    .update = update,
    .final = final,
    .init = serpent_init,
    .fini = serpent_fini,
}

Definition at line 124 of file crypto_serpent.c.