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104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
/* radare - LGPL - Copyright 2009-2022 - pancake */
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#include <r_lib.h>
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#include <r_crypto.h>
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static int mod(int a, int b) {
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if (b < 0) {
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return mod (-a, -b);
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}
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int ret = a % b;
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if (ret < 0) {
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ret += b;
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}
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return ret;
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}
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static bool rot_init(ut8 *rotkey, const ut8 *key, int keylen) {
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if (rotkey && key && keylen > 0) {
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int i = atoi ((const char *)key);
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*rotkey = (ut8)mod (i, 26);
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return true;
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}
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return false;
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}
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static void rot_crypt(ut8 key, const ut8 *inbuf, ut8 *outbuf, int buflen) {
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int i;
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for (i = 0; i < buflen; i++) {
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outbuf[i] = inbuf[i];
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if ((inbuf[i] < 'a' || inbuf[i] > 'z') && (inbuf[i] < 'A' || inbuf[i] > 'Z')) {
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continue;
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}
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outbuf[i] += key;
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outbuf[i] -= (inbuf[i] >= 'a' && inbuf[i] <= 'z') ? 'a' : 'A';
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outbuf[i] = mod (outbuf[i], 26);
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outbuf[i] += (inbuf[i] >= 'a' && inbuf[i] <= 'z') ? 'a' : 'A';
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}
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}
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static void rot_decrypt(ut8 key, const ut8 *inbuf, ut8 *outbuf, int buflen) {
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int i;
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for (i = 0; i < buflen; i++) {
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outbuf[i] = inbuf[i];
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if ((inbuf[i] < 'a' || inbuf[i] > 'z') && (inbuf[i] < 'A' || inbuf[i] > 'Z')) {
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continue;
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}
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outbuf[i] += 26; //adding so that subtracting does not make it negative
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outbuf[i] -= key;
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outbuf[i] -= (inbuf[i] >= 'a' && inbuf[i] <= 'z') ? 'a' : 'A';
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outbuf[i] = mod (outbuf[i], 26);
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outbuf[i] += (inbuf[i] >= 'a' && inbuf[i] <= 'z') ? 'a' : 'A';
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}
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}
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static bool rot_set_key(RCryptoJob *cj, const ut8 *key, int keylen, int mode, int direction) {
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cj->flag = direction == R_CRYPTO_DIR_ENCRYPT;
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return rot_init (&cj->rot_key, key, keylen);
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}
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static int rot_get_key_size(RCryptoJob *cj) {
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//Returning number of bytes occupied by ut8
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return 1;
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}
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static bool update(RCryptoJob *cj, const ut8 *buf, int len) {
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ut8 *obuf = calloc (1, len);
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if (!obuf) {
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return false;
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}
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switch (cj->flag) {
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case R_CRYPTO_DIR_ENCRYPT:
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rot_crypt (cj->rot_key, buf, obuf, len);
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break;
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case R_CRYPTO_DIR_DECRYPT:
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rot_decrypt (cj->rot_key, buf, obuf, len);
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break;
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}
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r_crypto_job_append (cj, obuf, len);
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free (obuf);
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return true;
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}
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RCryptoPlugin r_crypto_plugin_rot = {
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.meta = {
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.name = "rot",
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.author = "pancake",
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.license = "MIT",
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},
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.implements = "rot",
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.set_key = rot_set_key,
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.get_key_size = rot_get_key_size,
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.update = update,
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.end = update
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};
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#ifndef R2_PLUGIN_INCORE
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R_API RLibStruct radare_plugin = {
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.type = R_LIB_TYPE_CRYPTO,
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.data = &r_crypto_plugin_rot,
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.version = R2_VERSION
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};
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#endif
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