crypto_aes.c File Reference

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

Go to the source code of this file.

Functions
static void	encryptaes (struct aes_ctx *ctx, ut8 *in, ut8 *out)
static void	decryptaes (struct aes_ctx *ctx, ut8 *in, ut8 *out)
static bool	aes_set_key (RzCrypto *cry, const ut8 *key, int keylen, int mode, int direction)
static int	aes_get_key_size (RzCrypto *cry)
static bool	aes_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	aes_ecb_init (RzCrypto *cry)
static bool	aes_ecb_fini (RzCrypto *cry)

Variables
RzCryptoPlugin	rz_crypto_plugin_aes
RZ_API RzLibStruct	rizin_plugin

Function Documentation

aes_ecb_fini()

static bool aes_ecb_fini ( RzCrypto *  cry )

static

Definition at line 154 of file crypto_aes.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.

aes_ecb_init()

static bool aes_ecb_init ( RzCrypto *  cry )

static

Definition at line 147 of file crypto_aes.c.

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

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

aes_get_key_size()

static int aes_get_key_size ( RzCrypto *  cry )

static

Definition at line 81 of file crypto_aes.c.

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

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

aes_set_key()

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

static

Definition at line 43 of file crypto_aes.c.

                                                                                            {
    rz_return_val_if_fail(cry->user && key, false);
    struct aes_ctx *st = (struct aes_ctx *)cry->user;
 
    if (!(keylen == AES128_KEY_SIZE || keylen == AES192_KEY_SIZE || keylen == AES256_KEY_SIZE)) {
        return false;
    }
    st->key_size = keylen;
    switch (keylen) {
    case AES128_KEY_SIZE:
        if (direction == RZ_CRYPTO_DIR_ENCRYPT) {
            aes128_set_encrypt_key(&st->u.ctx128, key);
        } else {
            aes128_set_decrypt_key(&st->u.ctx128, key);
        }
        break;
    case AES192_KEY_SIZE:
        if (direction == RZ_CRYPTO_DIR_ENCRYPT) {
            aes192_set_encrypt_key(&st->u.ctx192, key);
        } else {
            aes192_set_decrypt_key(&st->u.ctx192, key);
        }
        break;
    case AES256_KEY_SIZE:
        if (direction == RZ_CRYPTO_DIR_ENCRYPT) {
            aes256_set_encrypt_key(&st->u.ctx256, key);
        } else {
            aes256_set_decrypt_key(&st->u.ctx256, key);
        }
        break;
    default:
        rz_warn_if_reached();
        break;
    }
    cry->dir = direction;
    return true;
}

References AES128_KEY_SIZE, aes128_set_decrypt_key(), aes128_set_encrypt_key(), AES192_KEY_SIZE, aes192_set_decrypt_key(), aes192_set_encrypt_key(), AES256_KEY_SIZE, aes256_set_decrypt_key(), aes256_set_encrypt_key(), aes_ctx::ctx128, aes_ctx::ctx192, aes_ctx::ctx256, rz_crypto_t::dir, if(), key, aes_ctx::key_size, RZ_CRYPTO_DIR_ENCRYPT, rz_return_val_if_fail, rz_warn_if_reached, aes_ctx::u, and rz_crypto_t::user.

aes_use()

static bool aes_use ( const char *  algo )

static

Definition at line 88 of file crypto_aes.c.

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

decryptaes()

static void decryptaes ( struct aes_ctx *  ctx, ut8 *  in, ut8 *  out  )

static

Definition at line 26 of file crypto_aes.c.

                                                               {
    switch (ctx->key_size) {
    case AES128_KEY_SIZE:
        aes128_decrypt(&ctx->u.ctx128, AES_BLOCK_SIZE, out, in);
        break;
    case AES192_KEY_SIZE:
        aes192_decrypt(&ctx->u.ctx192, AES_BLOCK_SIZE, out, in);
        break;
    case AES256_KEY_SIZE:
        aes256_decrypt(&ctx->u.ctx256, AES_BLOCK_SIZE, out, in);
        break;
    default:
        rz_warn_if_reached();
        break;
    }
}

References aes128_decrypt(), AES128_KEY_SIZE, aes192_decrypt(), AES192_KEY_SIZE, aes256_decrypt(), AES256_KEY_SIZE, AES_BLOCK_SIZE, in, out, and rz_warn_if_reached.

Referenced by update().

encryptaes()

static void encryptaes ( struct aes_ctx *  ctx, ut8 *  in, ut8 *  out  )

static

Definition at line 9 of file crypto_aes.c.

                                                               {
    switch (ctx->key_size) {
    case AES128_KEY_SIZE:
        aes128_encrypt(&ctx->u.ctx128, AES_BLOCK_SIZE, out, in);
        break;
    case AES192_KEY_SIZE:
        aes192_encrypt(&ctx->u.ctx192, AES_BLOCK_SIZE, out, in);
        break;
    case AES256_KEY_SIZE:
        aes256_encrypt(&ctx->u.ctx256, AES_BLOCK_SIZE, out, in);
        break;
    default:
        rz_warn_if_reached();
        break;
    }
}

References aes128_encrypt(), AES128_KEY_SIZE, aes192_encrypt(), AES192_KEY_SIZE, aes256_encrypt(), AES256_KEY_SIZE, AES_BLOCK_SIZE, in, out, and rz_warn_if_reached.

Referenced by update().

final()

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

static

Definition at line 143 of file crypto_aes.c.

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

References len, and update().

update()

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

static

Definition at line 92 of file crypto_aes.c.

                                                           {
    rz_return_val_if_fail(cry->user, 0);
    struct aes_ctx *st = (struct aes_ctx *)cry->user;
 
    if (len < 1) {
        return false;
    }
 
    // Pad to the block size, do not append dummy block
    const int diff = (AES_BLOCK_SIZE - (len % AES_BLOCK_SIZE)) % AES_BLOCK_SIZE;
    const int size = len + diff;
    const int blocks = size / AES_BLOCK_SIZE;
    int i;
 
    ut8 *const obuf = calloc(1, size);
    if (!obuf) {
        return false;
    }
    ut8 *const ibuf = calloc(1, size);
    if (!ibuf) {
        free(obuf);
        return false;
    }
 
    memset(ibuf, 0, size);
    memcpy(ibuf, buf, len);
    // Padding should start like 100000...
    if (diff) {
        ibuf[len] = 8; // 0b1000;
    }
 
    if (cry->dir == RZ_CRYPTO_DIR_ENCRYPT) {
        for (i = 0; i < blocks; i++) {
            const int delta = AES_BLOCK_SIZE * i;
            encryptaes(st, ibuf + delta, obuf + delta);
        }
    } else {
        for (i = 0; i < blocks; i++) {
            const int delta = AES_BLOCK_SIZE * i;
            decryptaes(st, ibuf + delta, obuf + delta);
        }
    }
 
    // printf("%128s\n", obuf);
 
    rz_crypto_append(cry, obuf, size);
    free(obuf);
    free(ibuf);
    return true;
}

References AES_BLOCK_SIZE, blocks, calloc(), decryptaes(), delta, rz_crypto_t::dir, encryptaes(), free(), i, if(), len, memcpy(), memset(), obuf, rz_crypto_append(), RZ_CRYPTO_DIR_ENCRYPT, rz_return_val_if_fail, and rz_crypto_t::user.

Referenced by __print_default_cb(), __print_disasmsummary_cb(), __print_graph_cb(), delete_element(), final(), rz_skiplist_insert(), sdb_ht_insert_kvp(), and sdb_ht_internal_insert().

Variable Documentation

rizin_plugin

RZ_API RzLibStruct rizin_plugin

Initial value:

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

Definition at line 175 of file crypto_aes.c.

rz_crypto_plugin_aes

RzCryptoPlugin rz_crypto_plugin_aes

Initial value:

= {
    .name = "aes-ecb",
    .author = "Nettle project (algorithm implementation), pancake (plugin)",
    .license = "LGPL3",
    .set_key = aes_set_key,
    .get_key_size = aes_get_key_size,
    .use = aes_use,
    .update = update,
    .final = final,
    .init = aes_ecb_init,
    .fini = aes_ecb_fini,
}

Definition at line 161 of file crypto_aes.c.