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botan: Add support for AES-CCM

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This commit is contained in:
Tobias Brunner
2018-10-26 11:06:45 +02:00
parent b1ab9782e2
commit 3f960e38a1
2 changed files with 110 additions and 75 deletions
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src/libstrongswan/plugins/botan/botan_aead.c
+96 -75
View File
@@ -28,7 +28,8 @@
#include <botan/build.h>
#if (defined(BOTAN_HAS_AES) && defined(BOTAN_HAS_AEAD_GCM)) || \
#if (defined(BOTAN_HAS_AES) && \
(defined(BOTAN_HAS_AEAD_GCM) || defined(BOTAN_HAS_AEAD_CCM))) || \
defined(BOTAN_HAS_AEAD_CHACHA20_POLY1305)
#include <crypto/iv/iv_gen_seq.h>
@@ -40,8 +41,11 @@
*/
#define IV_LEN 8
#define SALT_LEN 4
#define NONCE_LEN (IV_LEN + SALT_LEN)
#define CHAPOLY_KEY_LEN 32
/**
* As defined in RFC 4309
*/
#define CCM_SALT_LEN 3
typedef struct private_aead_t private_aead_t;
@@ -60,7 +64,7 @@ struct private_aead_t {
/**
* Salt value
*/
char salt[SALT_LEN];
chunk_t salt;
/**
* Size of the integrity check value
@@ -85,11 +89,8 @@ static bool do_crypt(private_aead_t *this, chunk_t data, chunk_t assoc,
chunk_t iv, u_char *out, uint32_t init_flag)
{
botan_cipher_t cipher;
uint8_t nonce[NONCE_LEN];
size_t output_written = 0, input_consumed = 0;
memcpy(nonce, this->salt, SALT_LEN);
memcpy(nonce + SALT_LEN, iv.ptr, IV_LEN);
chunk_t nonce;
if (botan_cipher_init(&cipher, this->cipher_name, init_flag))
{
@@ -109,7 +110,9 @@ static bool do_crypt(private_aead_t *this, chunk_t data, chunk_t assoc,
return FALSE;
}
if (botan_cipher_start(cipher, nonce, NONCE_LEN))
nonce = chunk_cata("cc", this->salt, iv);
if (botan_cipher_start(cipher, nonce.ptr, nonce.len))
{
botan_cipher_destroy(cipher);
return FALSE;
@@ -206,7 +209,7 @@ METHOD(aead_t, get_iv_gen, iv_gen_t*,
METHOD(aead_t, get_key_size, size_t,
private_aead_t *this)
{
return this->key.len + SALT_LEN;
return this->key.len + this->salt.len;
}
METHOD(aead_t, set_key, bool,
@@ -216,7 +219,7 @@ METHOD(aead_t, set_key, bool,
{
return FALSE;
}
memcpy(this->salt, key.ptr + key.len - SALT_LEN, SALT_LEN);
memcpy(this->salt.ptr, key.ptr + key.len - this->salt.len, this->salt.len);
memcpy(this->key.ptr, key.ptr, this->key.len);
return TRUE;
}
@@ -225,76 +228,76 @@ METHOD(aead_t, destroy, void,
private_aead_t *this)
{
chunk_clear(&this->key);
chunk_clear(&this->salt);
this->iv_gen->destroy(this->iv_gen);
free(this);
}
#if defined(BOTAN_HAS_AES) && defined(BOTAN_HAS_AEAD_GCM)
#ifdef BOTAN_HAS_AES
#if defined(BOTAN_HAS_AEAD_GCM) || defined(BOTAN_HAS_AEAD_GCM)
static struct {
encryption_algorithm_t algo;
size_t key_size;
char *name;
size_t icv_size;
} aes_modes[] = {
{ ENCR_AES_GCM_ICV8, 16, "AES-128/GCM(8)", 8 },
{ ENCR_AES_GCM_ICV8, 24, "AES-192/GCM(8)", 8 },
{ ENCR_AES_GCM_ICV8, 32, "AES-256/GCM(8)", 8 },
{ ENCR_AES_GCM_ICV12, 16, "AES-128/GCM(12)", 12 },
{ ENCR_AES_GCM_ICV12, 24, "AES-192/GCM(12)", 12 },
{ ENCR_AES_GCM_ICV12, 32, "AES-256/GCM(12)", 12 },
{ ENCR_AES_GCM_ICV16, 16, "AES-128/GCM(16)", 16 },
{ ENCR_AES_GCM_ICV16, 24, "AES-192/GCM(16)", 16 },
{ ENCR_AES_GCM_ICV16, 32, "AES-256/GCM(16)", 16 },
{ ENCR_AES_CCM_ICV8, 16, "AES-128/CCM(8,4)", 8 },
{ ENCR_AES_CCM_ICV8, 24, "AES-192/CCM(8,4)", 8 },
{ ENCR_AES_CCM_ICV8, 32, "AES-256/CCM(8,4)", 8 },
{ ENCR_AES_CCM_ICV12, 16, "AES-128/CCM(12,4)", 12 },
{ ENCR_AES_CCM_ICV12, 24, "AES-192/CCM(12,4)", 12 },
{ ENCR_AES_CCM_ICV12, 32, "AES-256/CCM(12,4)", 12 },
{ ENCR_AES_CCM_ICV16, 16, "AES-128/CCM(16,4)", 16 },
{ ENCR_AES_CCM_ICV16, 24, "AES-192/CCM(16,4)", 16 },
{ ENCR_AES_CCM_ICV16, 32, "AES-256/CCM(16,4)", 16 },
};
/**
* Determine the cipher name and ICV size for the given algorithm and key size
*/
static bool determine_gcm_params(private_aead_t *this,
static bool determine_aes_params(private_aead_t *this,
encryption_algorithm_t algo, size_t key_size)
{
switch (algo)
int i;
for (i = 0; i < countof(aes_modes); i++)
{
case ENCR_AES_GCM_ICV8:
switch (key_size)
{
case 16:
this->cipher_name = "AES-128/GCM(8)";
break;
case 24:
this->cipher_name = "AES-192/GCM(8)";
break;
case 32:
this->cipher_name = "AES-256/GCM(8)";
break;
default:
return FALSE;
}
this->icv_size = 8;
if (aes_modes[i].algo == algo &&
aes_modes[i].key_size == key_size)
{
this->cipher_name = aes_modes[i].name;
this->icv_size = aes_modes[i].icv_size;
return TRUE;
case ENCR_AES_GCM_ICV12:
switch (key_size)
{
case 16:
this->cipher_name = "AES-128/GCM(12)";
break;
case 24:
this->cipher_name = "AES-192/GCM(12)";
break;
case 32:
this->cipher_name = "AES-256/GCM(12)";
break;
default:
return FALSE;
}
this->icv_size = 12;
return TRUE;
case ENCR_AES_GCM_ICV16:
switch (key_size)
{
case 16:
this->cipher_name = "AES-128/GCM";
break;
case 24:
this->cipher_name = "AES-192/GCM";
break;
case 32:
this->cipher_name = "AES-256/GCM";
break;
default:
return FALSE;
}
this->icv_size = 16;
return TRUE;
default:
return FALSE;
}
}
return FALSE;
}
#endif
#endif
/**
* Check the given salt size, set it if not set
*/
static bool check_salt_size(size_t expected, size_t *salt_size)
{
if (*salt_size)
{
return *salt_size == expected;
}
*salt_size = expected;
return TRUE;
}
/*
* Described in header
@@ -318,15 +321,10 @@ aead_t *botan_aead_create(encryption_algorithm_t algo, size_t key_size,
},
);
if (salt_size && salt_size != SALT_LEN)
{
free(this);
return NULL;
}
switch (algo)
{
#if defined(BOTAN_HAS_AES) && defined(BOTAN_HAS_AEAD_GCM)
#ifdef BOTAN_HAS_AES
#ifdef BOTAN_HAS_AEAD_GCM
case ENCR_AES_GCM_ICV8:
case ENCR_AES_GCM_ICV12:
case ENCR_AES_GCM_ICV16:
@@ -334,21 +332,43 @@ aead_t *botan_aead_create(encryption_algorithm_t algo, size_t key_size,
{
key_size = 16;
}
if (!determine_gcm_params(this, algo, key_size))
if (!check_salt_size(SALT_LEN, &salt_size) ||
!determine_aes_params(this, algo, key_size))
{
free(this);
return NULL;
}
break;
#endif
#ifdef BOTAN_HAS_AEAD_CCM
case ENCR_AES_CCM_ICV8:
case ENCR_AES_CCM_ICV12:
case ENCR_AES_CCM_ICV16:
if (!key_size)
{
key_size = 16;
}
if (!check_salt_size(CCM_SALT_LEN, &salt_size) ||
!determine_aes_params(this, algo, key_size))
{
free(this);
return NULL;
}
break;
#endif
#endif
#ifdef BOTAN_HAS_AEAD_CHACHA20_POLY1305
case ENCR_CHACHA20_POLY1305:
if (key_size && key_size != CHAPOLY_KEY_LEN)
if (!key_size)
{
key_size = CHAPOLY_KEY_LEN;
}
if (key_size != CHAPOLY_KEY_LEN ||
!check_salt_size(SALT_LEN, &salt_size))
{
free(this);
return NULL;
}
key_size = CHAPOLY_KEY_LEN;
this->cipher_name = "ChaCha20Poly1305";
this->icv_size = 16;
break;
@@ -359,6 +379,7 @@ aead_t *botan_aead_create(encryption_algorithm_t algo, size_t key_size,
}
this->key = chunk_alloc(key_size);
this->salt = chunk_alloc(salt_size);
this->iv_gen = iv_gen_seq_create();
return &this->public;
src/libstrongswan/plugins/botan/botan_plugin.c
+14
View File
@@ -122,6 +122,20 @@ METHOD(plugin_t, get_features, int,
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV12, 16),
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV12, 24),
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV12, 32),
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV8, 16),
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV8, 24),
PLUGIN_PROVIDE(AEAD, ENCR_AES_GCM_ICV8, 32),
#endif
#ifdef BOTAN_HAS_AEAD_CCM
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV16, 16),
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV16, 24),
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV16, 32),
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV12, 16),
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV12, 24),
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV12, 32),
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV8, 16),
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV8, 24),
PLUGIN_PROVIDE(AEAD, ENCR_AES_CCM_ICV8, 32),
#endif
#endif
#ifdef BOTAN_HAS_AEAD_CHACHA20_POLY1305