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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2014, Linaro Limited
*/
#include <crypto/crypto.h>
#include <initcall.h>
#include <kernel/panic.h>
#include <kernel/tee_time.h>
#include <rng_support.h>
#include <stdlib.h>
#include <string_ext.h>
#include <string.h>
#include <tee/tee_cryp_utl.h>
#include <trace.h>
#include <utee_defines.h>
TEE_Result tee_alg_get_digest_size(uint32_t algo, size_t *size)
{
size_t digest_size = TEE_ALG_GET_DIGEST_SIZE(algo);
if (!digest_size)
return TEE_ERROR_NOT_SUPPORTED;
*size = digest_size;
return TEE_SUCCESS;
}
TEE_Result tee_hash_createdigest(uint32_t algo, const uint8_t *data,
size_t datalen, uint8_t *digest,
size_t digestlen)
{
TEE_Result res;
void *ctx = NULL;
res = crypto_hash_alloc_ctx(&ctx, algo);
if (res)
return res;
res = crypto_hash_init(ctx);
if (res)
goto out;
if (datalen != 0) {
res = crypto_hash_update(ctx, data, datalen);
if (res)
goto out;
}
res = crypto_hash_final(ctx, digest, digestlen);
out:
crypto_hash_free_ctx(ctx);
return res;
}
TEE_Result tee_cipher_get_block_size(uint32_t algo, size_t *size)
{
switch (algo) {
case TEE_ALG_AES_CBC_MAC_NOPAD:
case TEE_ALG_AES_CBC_MAC_PKCS5:
case TEE_ALG_AES_CMAC:
case TEE_ALG_AES_ECB_NOPAD:
case TEE_ALG_AES_CBC_NOPAD:
case TEE_ALG_AES_CTR:
case TEE_ALG_AES_CTS:
case TEE_ALG_AES_XTS:
case TEE_ALG_AES_CCM:
case TEE_ALG_AES_GCM:
case TEE_ALG_SM4_ECB_NOPAD:
case TEE_ALG_SM4_CBC_NOPAD:
case TEE_ALG_SM4_CTR:
*size = 16;
break;
case TEE_ALG_DES_CBC_MAC_NOPAD:
case TEE_ALG_DES_CBC_MAC_PKCS5:
case TEE_ALG_DES_ECB_NOPAD:
case TEE_ALG_DES_CBC_NOPAD:
case TEE_ALG_DES3_CBC_MAC_NOPAD:
case TEE_ALG_DES3_CBC_MAC_PKCS5:
case TEE_ALG_DES3_ECB_NOPAD:
case TEE_ALG_DES3_CBC_NOPAD:
*size = 8;
break;
default:
return TEE_ERROR_NOT_SUPPORTED;
}
return TEE_SUCCESS;
}
TEE_Result tee_do_cipher_update(void *ctx, uint32_t algo,
TEE_OperationMode mode, bool last_block,
const uint8_t *data, size_t len, uint8_t *dst)
{
TEE_Result res;
size_t block_size;
if (mode != TEE_MODE_ENCRYPT && mode != TEE_MODE_DECRYPT)
return TEE_ERROR_BAD_PARAMETERS;
/*
* Check that the block contains the correct number of data, apart
* for the last block in some XTS / CTR / XTS mode
*/
res = tee_cipher_get_block_size(algo, &block_size);
if (res != TEE_SUCCESS)
return res;
if ((len % block_size) != 0) {
if (!last_block && algo != TEE_ALG_AES_CTR)
return TEE_ERROR_BAD_PARAMETERS;
switch (algo) {
case TEE_ALG_AES_ECB_NOPAD:
case TEE_ALG_DES_ECB_NOPAD:
case TEE_ALG_DES3_ECB_NOPAD:
case TEE_ALG_AES_CBC_NOPAD:
case TEE_ALG_DES_CBC_NOPAD:
case TEE_ALG_DES3_CBC_NOPAD:
case TEE_ALG_SM4_ECB_NOPAD:
case TEE_ALG_SM4_CBC_NOPAD:
return TEE_ERROR_BAD_PARAMETERS;
case TEE_ALG_AES_CTR:
case TEE_ALG_AES_XTS:
case TEE_ALG_AES_CTS:
/*
* These modes doesn't require padding for the last
* block.
*
* This isn't entirely true, both XTS and CTS can only
* encrypt minimum one block and also they need at least
* one complete block in the last update to finish the
* encryption. The algorithms are supposed to detect
* that, we're only making sure that all data fed up to
* that point consists of complete blocks.
*/
break;
default:
return TEE_ERROR_NOT_SUPPORTED;
}
}
return crypto_cipher_update(ctx, mode, last_block, data, len, dst);
}
/*
* Override this in your platform code to feed the PRNG platform-specific
* jitter entropy. This implementation does not efficiently deliver entropy
* and is here for backwards-compatibility.
*/
__weak void plat_prng_add_jitter_entropy(enum crypto_rng_src sid,
unsigned int *pnum)
{
TEE_Time current;
#ifdef CFG_SECURE_TIME_SOURCE_REE
if (CRYPTO_RNG_SRC_IS_QUICK(sid))
return; /* Can't read REE time here */
#endif
if (tee_time_get_sys_time(¤t) == TEE_SUCCESS)
crypto_rng_add_event(sid, pnum, ¤t, sizeof(current));
}
__weak void plat_rng_init(void)
{
TEE_Result res = TEE_SUCCESS;
TEE_Time t;
#ifndef CFG_SECURE_TIME_SOURCE_REE
/*
* This isn't much of a seed. Ideally we should either get a seed from
* a hardware RNG or from a previously saved seed.
*
* Seeding with hardware RNG is currently up to the platform to
* override this function.
*
* Seeding with a saved seed will require cooperation from normal
* world, this is still TODO.
*/
res = tee_time_get_sys_time(&t);
#else
EMSG("Warning: seeding RNG with zeroes");
memset(&t, 0, sizeof(t));
#endif
if (!res)
res = crypto_rng_init(&t, sizeof(t));
if (res) {
EMSG("Failed to initialize RNG: %#" PRIx32, res);
panic();
}
}
static TEE_Result tee_cryp_init(void)
{
TEE_Result res = crypto_init();
if (res) {
EMSG("Failed to initialize crypto API: %#" PRIx32, res);
panic();
}
plat_rng_init();
return TEE_SUCCESS;
}
service_init(tee_cryp_init);
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