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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2010-2018. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#include "cipher.h"
#ifdef HAVE_DES
#define COND_NO_DES_PTR(Ptr) (Ptr)
#else
#define COND_NO_DES_PTR(Ptr) (NULL)
#endif
static struct cipher_type_t cipher_types[] =
{
#ifdef HAVE_RC2
{{"rc2_cbc"}, {&EVP_rc2_cbc}, 0, NO_FIPS_CIPHER},
#else
{{"rc2_cbc"}, {NULL}, 0, NO_FIPS_CIPHER},
#endif
#ifdef HAVE_RC4
{{"rc4"}, {&EVP_rc4}, 0, NO_FIPS_CIPHER},
#else
{{"rc4"}, {NULL}, 0, NO_FIPS_CIPHER},
#endif
{{"des_cbc"}, {COND_NO_DES_PTR(&EVP_des_cbc)}, 0, NO_FIPS_CIPHER},
{{"des_cfb"}, {COND_NO_DES_PTR(&EVP_des_cfb8)}, 0, NO_FIPS_CIPHER},
{{"des_ecb"}, {COND_NO_DES_PTR(&EVP_des_ecb)}, 0, NO_FIPS_CIPHER | ECB_BUG_0_9_8L},
{{"des_ede3_cbc"}, {COND_NO_DES_PTR(&EVP_des_ede3_cbc)}, 0, 0},
#ifdef HAVE_DES_ede3_cfb_encrypt
{{"des_ede3_cfb"}, {COND_NO_DES_PTR(&EVP_des_ede3_cfb8)}, 0, 0},
#else
{{"des_ede3_cfb"}, {NULL}, 0, 0},
#endif
#ifdef HAVE_BF
{{"blowfish_cbc"}, {&EVP_bf_cbc}, 0, NO_FIPS_CIPHER},
{{"blowfish_cfb64"}, {&EVP_bf_cfb64}, 0, NO_FIPS_CIPHER},
{{"blowfish_ofb64"}, {&EVP_bf_ofb}, 0, NO_FIPS_CIPHER},
{{"blowfish_ecb"}, {&EVP_bf_ecb}, 0, NO_FIPS_CIPHER | ECB_BUG_0_9_8L},
#else
{{"blowfish_cbc"}, {NULL}, 0, 0},
{{"blowfish_cfb64"}, {NULL}, 0, 0},
{{"blowfish_ofb64"}, {NULL}, 0, 0},
{{"blowfish_ecb"}, {NULL}, 0, 0},
#endif
{{"aes_128_cbc"}, {&EVP_aes_128_cbc}, 16, 0},
{{"aes_192_cbc"}, {&EVP_aes_192_cbc}, 24, 0},
{{"aes_256_cbc"}, {&EVP_aes_256_cbc}, 32, 0},
{{"aes_128_cfb8"}, {&EVP_aes_128_cfb8}, 16, NO_FIPS_CIPHER | AES_CFBx},
{{"aes_192_cfb8"}, {&EVP_aes_192_cfb8}, 24, NO_FIPS_CIPHER | AES_CFBx},
{{"aes_256_cfb8"}, {&EVP_aes_256_cfb8}, 32, NO_FIPS_CIPHER | AES_CFBx},
{{"aes_128_cfb128"}, {&EVP_aes_128_cfb128}, 16, NO_FIPS_CIPHER | AES_CFBx},
{{"aes_192_cfb128"}, {&EVP_aes_192_cfb128}, 24, NO_FIPS_CIPHER | AES_CFBx},
{{"aes_256_cfb128"}, {&EVP_aes_256_cfb128}, 32, NO_FIPS_CIPHER | AES_CFBx},
{{"aes_128_ecb"}, {&EVP_aes_128_ecb}, 16, ECB_BUG_0_9_8L},
{{"aes_192_ecb"}, {&EVP_aes_192_ecb}, 24, ECB_BUG_0_9_8L},
{{"aes_256_ecb"}, {&EVP_aes_256_ecb}, 32, ECB_BUG_0_9_8L},
#if defined(HAVE_EVP_AES_CTR)
{{"aes_128_ctr"}, {&EVP_aes_128_ctr}, 16, 0},
{{"aes_192_ctr"}, {&EVP_aes_192_ctr}, 24, 0},
{{"aes_256_ctr"}, {&EVP_aes_256_ctr}, 32, 0},
#else
{{"aes_128_ctr"}, {NULL}, 16, AES_CTR_COMPAT},
{{"aes_192_ctr"}, {NULL}, 24, AES_CTR_COMPAT},
{{"aes_256_ctr"}, {NULL}, 32, AES_CTR_COMPAT},
#endif
#if defined(HAVE_CHACHA20)
{{"chacha20"}, {&EVP_chacha20}, 32, NO_FIPS_CIPHER},
#else
{{"chacha20"}, {NULL}, 0, NO_FIPS_CIPHER},
#endif
/*==== AEAD ciphers ====*/
#if defined(HAVE_CHACHA20_POLY1305)
{{"chacha20_poly1305"}, {&EVP_chacha20_poly1305}, 0, NO_FIPS_CIPHER | AEAD_CIPHER, {{EVP_CTRL_AEAD_SET_IVLEN,EVP_CTRL_AEAD_GET_TAG,EVP_CTRL_AEAD_SET_TAG}}},
#else
{{"chacha20_poly1305"}, {NULL}, 0, NO_FIPS_CIPHER | AEAD_CIPHER, {{0,0,0}}},
#endif
#if defined(HAVE_GCM)
{{"aes_128_gcm"}, {&EVP_aes_128_gcm}, 16, AEAD_CIPHER|GCM_MODE, {{EVP_CTRL_GCM_SET_IVLEN,EVP_CTRL_GCM_GET_TAG,EVP_CTRL_GCM_SET_TAG}}},
{{"aes_192_gcm"}, {&EVP_aes_192_gcm}, 24, AEAD_CIPHER|GCM_MODE, {{EVP_CTRL_GCM_SET_IVLEN,EVP_CTRL_GCM_GET_TAG,EVP_CTRL_GCM_SET_TAG}}},
{{"aes_256_gcm"}, {&EVP_aes_256_gcm}, 32, AEAD_CIPHER|GCM_MODE, {{EVP_CTRL_GCM_SET_IVLEN,EVP_CTRL_GCM_GET_TAG,EVP_CTRL_GCM_SET_TAG}}},
#else
{{"aes_128_gcm"}, {NULL}, 16, AEAD_CIPHER|GCM_MODE, {{0,0,0}}},
{{"aes_192_gcm"}, {NULL}, 24, AEAD_CIPHER|GCM_MODE, {{0,0,0}}},
{{"aes_256_gcm"}, {NULL}, 32, AEAD_CIPHER|GCM_MODE, {{0,0,0}}},
#endif
#if defined(HAVE_CCM)
{{"aes_128_ccm"}, {&EVP_aes_128_ccm}, 16, AEAD_CIPHER|CCM_MODE, {{EVP_CTRL_CCM_SET_IVLEN,EVP_CTRL_CCM_GET_TAG,EVP_CTRL_CCM_SET_TAG}}},
{{"aes_192_ccm"}, {&EVP_aes_192_ccm}, 24, AEAD_CIPHER|CCM_MODE, {{EVP_CTRL_CCM_SET_IVLEN,EVP_CTRL_CCM_GET_TAG,EVP_CTRL_CCM_SET_TAG}}},
{{"aes_256_ccm"}, {&EVP_aes_256_ccm}, 32, AEAD_CIPHER|CCM_MODE, {{EVP_CTRL_CCM_SET_IVLEN,EVP_CTRL_CCM_GET_TAG,EVP_CTRL_CCM_SET_TAG}}},
#else
{{"aes_128_ccm"}, {NULL}, 16, AEAD_CIPHER|CCM_MODE, {{0,0,0}}},
{{"aes_192_ccm"}, {NULL}, 24, AEAD_CIPHER|CCM_MODE, {{0,0,0}}},
{{"aes_256_ccm"}, {NULL}, 32, AEAD_CIPHER|CCM_MODE, {{0,0,0}}},
#endif
/*==== Specialy handled ciphers, only for inclusion in algorithm's list ====*/
#ifdef HAVE_AES_IGE
{{"aes_ige256"}, {NULL}, 0, NO_FIPS_CIPHER | NON_EVP_CIPHER},
#endif
/*==== End of list ==== */
{{NULL},{NULL},0,0}
};
ErlNifResourceType* evp_cipher_ctx_rtype;
static size_t num_cipher_types = 0;
static void evp_cipher_ctx_dtor(ErlNifEnv* env, struct evp_cipher_ctx* ctx) {
if (ctx == NULL)
return;
if (ctx->ctx)
EVP_CIPHER_CTX_free(ctx->ctx);
#if !defined(HAVE_EVP_AES_CTR)
if (ctx->env)
enif_free_env(ctx->env);
#endif
}
int init_cipher_ctx(ErlNifEnv *env) {
evp_cipher_ctx_rtype = enif_open_resource_type(env, NULL, "EVP_CIPHER_CTX",
(ErlNifResourceDtor*) evp_cipher_ctx_dtor,
ERL_NIF_RT_CREATE|ERL_NIF_RT_TAKEOVER,
NULL);
if (evp_cipher_ctx_rtype == NULL)
goto err;
return 1;
err:
PRINTF_ERR0("CRYPTO: Could not open resource type 'EVP_CIPHER_CTX'");
return 0;
}
void init_cipher_types(ErlNifEnv* env)
{
struct cipher_type_t* p = cipher_types;
num_cipher_types = 0;
for (p = cipher_types; p->type.str; p++) {
num_cipher_types++;
p->type.atom = enif_make_atom(env, p->type.str);
if (p->cipher.funcp)
p->cipher.p = p->cipher.funcp();
}
p->type.atom = atom_false; /* end marker */
qsort(cipher_types, num_cipher_types, sizeof(cipher_types[0]), cmp_cipher_types);
}
const struct cipher_type_t* get_cipher_type(ERL_NIF_TERM type, size_t key_len)
{
struct cipher_type_t key;
key.type.atom = type;
key.key_len = key_len;
return bsearch(&key, cipher_types, num_cipher_types, sizeof(cipher_types[0]), cmp_cipher_types);
}
int cmp_cipher_types(const void *keyp, const void *elemp) {
const struct cipher_type_t *key = keyp;
const struct cipher_type_t *elem = elemp;
if (key->type.atom < elem->type.atom) return -1;
else if (key->type.atom > elem->type.atom) return 1;
else /* key->type.atom == elem->type.atom */
if (!elem->key_len || key->key_len == elem->key_len) return 0;
else if (key->key_len < elem->key_len) return -1;
else return 1;
}
ERL_NIF_TERM cipher_info_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{/* (Type) */
const struct cipher_type_t *cipherp;
const EVP_CIPHER *cipher;
ERL_NIF_TERM ret, ret_mode;
unsigned type;
unsigned long mode;
if ((cipherp = get_cipher_type_no_key(argv[0])) == NULL)
return enif_make_badarg(env);
if (FORBIDDEN_IN_FIPS(cipherp))
return enif_raise_exception(env, atom_notsup);
if ((cipher = cipherp->cipher.p) == NULL)
return enif_raise_exception(env, atom_notsup);
ret = enif_make_new_map(env);
type = EVP_CIPHER_type(cipher);
enif_make_map_put(env, ret, atom_type,
type == NID_undef ? atom_undefined : enif_make_int(env, type),
&ret);
enif_make_map_put(env, ret, atom_key_length,
enif_make_int(env, EVP_CIPHER_key_length(cipher)), &ret);
enif_make_map_put(env, ret, atom_iv_length,
enif_make_int(env, EVP_CIPHER_iv_length(cipher)), &ret);
enif_make_map_put(env, ret, atom_block_size,
enif_make_int(env, EVP_CIPHER_block_size(cipher)), &ret);
mode = EVP_CIPHER_mode(cipher);
switch (mode) {
case EVP_CIPH_ECB_MODE:
ret_mode = atom_ecb_mode;
break;
case EVP_CIPH_CBC_MODE:
ret_mode = atom_cbc_mode;
break;
case EVP_CIPH_CFB_MODE:
ret_mode = atom_cfb_mode;
break;
case EVP_CIPH_OFB_MODE:
ret_mode = atom_ofb_mode;
break;
#ifdef EVP_CIPH_CTR_MODE
case EVP_CIPH_CTR_MODE:
ret_mode = atom_ctr_mode;
break;
#endif
#ifdef EVP_CIPH_GCM_MODE
case EVP_CIPH_GCM_MODE:
ret_mode = atom_gcm_mode;
break;
#endif
#ifdef EVP_CIPH_CCM_MODE
case EVP_CIPH_CCM_MODE:
ret_mode = atom_ccm_mode;
break;
#endif
#ifdef EVP_CIPH_XTS_MODE
case EVP_CIPH_XTS_MODE:
ret_mode = atom_xts_mode;
break;
#endif
#ifdef EVP_CIPH_WRAP_MODE
case EVP_CIPH_WRAP_MODE:
ret_mode = atom_wrap_mode;
break;
#endif
#ifdef EVP_CIPH_OCB_MODE
case EVP_CIPH_OCB_MODE:
ret_mode = atom_ocb_mode;
break;
#endif
case EVP_CIPH_STREAM_CIPHER:
ret_mode = atom_stream_cipher;
break;
default:
ret_mode = atom_undefined;
break;
}
enif_make_map_put(env, ret, atom_mode, ret_mode, &ret);
return ret;
}
const struct cipher_type_t* get_cipher_type_no_key(ERL_NIF_TERM type)
{
struct cipher_type_t key;
key.type.atom = type;
return bsearch(&key, cipher_types, num_cipher_types, sizeof(cipher_types[0]), cmp_cipher_types_no_key);
}
int cmp_cipher_types_no_key(const void *keyp, const void *elemp) {
const struct cipher_type_t *key = keyp;
const struct cipher_type_t *elem = elemp;
if (key->type.atom < elem->type.atom) return -1;
else if (key->type.atom > elem->type.atom) return 1;
else /* key->type.atom == elem->type.atom */ return 0;
}
ERL_NIF_TERM cipher_types_as_list(ErlNifEnv* env)
{
struct cipher_type_t* p;
ERL_NIF_TERM prev, hd;
hd = enif_make_list(env, 0);
prev = atom_undefined;
for (p = cipher_types; (p->type.atom & (p->type.atom != atom_false)); p++) {
if ((prev == p->type.atom) ||
FORBIDDEN_IN_FIPS(p) )
continue;
if ((p->cipher.p != NULL) ||
(p->flags & AES_CTR_COMPAT) ||
(p->type.atom == atom_aes_ige256)) /* Special handling. Bad indeed... */
{
hd = enif_make_list_cell(env, p->type.atom, hd);
}
}
return hd;
}
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