const cipher_kt_t *get_cipher_type(int method)
{
if (method <= TABLE || method >= CIPHER_NUM) {
LOGE("get_cipher_type(): Illegal method");
return NULL;
}
if (method == RC4_MD5) {
method = RC4;
}
if (method >= SALSA20) {
return NULL;
}
const char *ciphername = supported_ciphers[method];
#if defined(USE_CRYPTO_OPENSSL)
return EVP_get_cipherbyname(ciphername);
#elif defined(USE_CRYPTO_POLARSSL)
const char *polarname = supported_ciphers_polarssl[method];
if (strcmp(polarname, CIPHER_UNSUPPORTED) == 0) {
LOGE("Cipher %s currently is not supported by PolarSSL library",
ciphername);
return NULL;
}
return cipher_info_from_string(polarname);
#endif
}
_cipher_init()
{
int32_t i, j, k;
for (i = 0; i < PROVIDER_COUNT; i ++)
for (j = 0; j < SIZE_COUNT; j ++)
if (s_sizes[i][j].name)
for (k = 0; k < MODE_COUNT; k ++)
{
std::string name = s_sizes[i][j].name;
name.append(s_modes[k]);
s_sizes[i][j].cis[k] = cipher_info_from_string(name.c_str());
if (s_sizes[i][j].cis[k])
s_sizes[i][j].size = s_sizes[i][j].cis[k]->key_length;
}
}
const cipher_info_t *
cipher_kt_get (const char *ciphername)
{
const cipher_info_t *cipher = NULL;
ASSERT (ciphername);
cipher = cipher_info_from_string(ciphername);
if (NULL == cipher)
msg (M_FATAL, "Cipher algorithm '%s' not found", ciphername);
if (cipher->key_length/8 > MAX_CIPHER_KEY_LENGTH)
msg (M_FATAL, "Cipher algorithm '%s' uses a default key size (%d bytes) which is larger than " PACKAGE_NAME "'s current maximum key size (%d bytes)",
ciphername,
cipher->key_length/8,
MAX_CIPHER_KEY_LENGTH);
return cipher;
}
