crypto_base64.c

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// SPDX-FileCopyrightText: 2016-2017 rakholiyajenish.07 <rakholiyajenish.07@gmail.com>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <rz_lib.h>
#include <rz_crypto.h>
#include <rz_util.h>
 
static bool base64_set_key(RzCrypto *cry, const ut8 *key, int keylen, int mode, int direction) {
    cry->dir = direction;
    return true;
}
 
static int base64_get_key_size(RzCrypto *cry) {
    return 0;
}
 
static bool base64_use(const char *algo) {
    return !strcmp(algo, "base64");
}
 
static bool update(RzCrypto *cry, const ut8 *buf, int len) {
    if (len < 1) {
        return false;
    }
 
    int olen = 0;
    ut8 *obuf = NULL;
    if (cry->dir == RZ_CRYPTO_DIR_ENCRYPT) {
        olen = ((len + 2) / 3) * 4;
        obuf = malloc(olen + 1);
        if (!obuf) {
            return false;
        }
        rz_base64_encode((char *)obuf, (const ut8 *)buf, len);
    } else {
        olen = 4 + ((len / 4) * 3);
        if (len > 0) {
            olen -= (buf[len - 1] == '=') ? ((buf[len - 2] == '=') ? 2 : 1) : 0;
        }
        obuf = malloc(olen + 4);
        if (!obuf) {
            return false;
        }
        olen = rz_base64_decode(obuf, (const char *)buf, len);
    }
    if (olen > 0) {
        rz_crypto_append(cry, obuf, olen);
    }
    free(obuf);
    return true;
}
 
static bool final(RzCrypto *cry, const ut8 *buf, int len) {
    if (!buf) {
        return true;
    }
    return update(cry, buf, len);
}
 
RzCryptoPlugin rz_crypto_plugin_base64 = {
    .name = "base64",
    .author = "rakholiyajenish.07",
    .license = "LGPL-3",
    .set_key = base64_set_key,
    .get_key_size = base64_get_key_size,
    .use = base64_use,
    .update = update,
    .final = final
};
 
#ifndef RZ_PLUGIN_INCORE
RZ_API RzLibStruct rizin_plugin = {
    .type = RZ_LIB_TYPE_CRYPTO,
    .data = &rz_crypto_plugin_base64,
    .version = RZ_VERSION
};
#endif