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- #include "sdk_common.h"
- #if NRF_MODULE_ENABLED(NRF_CRYPTO)
- #include <drivers/nrfx_common.h>
- #include <stdbool.h>
- #include "cc310_backend_mutex.h"
- #include "crys_chacha_poly_error.h"
- #include "cc310_backend_chacha_poly_aead.h"
- #include "cc310_backend_shared.h"
- #include "cc310_backend_shared.h"
- #if NRF_MODULE_ENABLED(NRF_CRYPTO_CC310_CHACHA_POLY_AEAD)
- static ret_code_t result_get(CRYSError_t error)
- {
- ret_code_t ret_val;
- switch (error)
- {
- case CRYS_OK:
- ret_val = NRF_SUCCESS;
- break;
-
- case CRYS_CHACHA_POLY_DATA_INVALID_ERROR:
- case CRYS_CHACHA_POLY_ADATA_INVALID_ERROR:
- ret_val = NRF_ERROR_CRYPTO_INPUT_NULL;
- break;
-
- case CRYS_CHACHA_POLY_ENC_MODE_INVALID_ERROR:
- ret_val = NRF_ERROR_CRYPTO_INVALID_PARAM;
- break;
-
- case CRYS_CHACHA_POLY_DATA_SIZE_INVALID_ERROR:
- ret_val = NRF_ERROR_CRYPTO_INPUT_LENGTH;
- break;
-
- case CRYS_CHACHA_POLY_MAC_ERROR:
- ret_val = NRF_ERROR_CRYPTO_AEAD_INVALID_MAC;
- break;
- default:
- ret_val = NRF_ERROR_CRYPTO_INTERNAL;
- break;
- }
- return ret_val;
- }
- static ret_code_t backend_cc310_init(void * const p_context, uint8_t * p_key)
- {
- nrf_crypto_backend_chacha_poly_context_t * p_ctx =
- (nrf_crypto_backend_chacha_poly_context_t *)p_context;
- if (!nrfx_is_in_ram(p_ctx))
- {
- return NRF_ERROR_CRYPTO_INPUT_LOCATION;
- }
- if (p_ctx->header.p_info->key_size != NRF_CRYPTO_KEY_SIZE_256)
- {
- return NRF_ERROR_CRYPTO_KEY_SIZE;
- }
- memcpy(p_ctx->key, p_key, sizeof(p_ctx->key));
- return NRF_SUCCESS;
- }
- static inline ret_code_t backend_cc310_uninit(void * const p_context)
- {
- return NRF_SUCCESS;
- }
- static ret_code_t backend_cc310_crypt(void * const p_context,
- nrf_crypto_operation_t operation,
- uint8_t * p_nonce,
- uint8_t nonce_size,
- uint8_t * p_adata,
- size_t adata_size,
- uint8_t * p_data_in,
- size_t data_in_size,
- uint8_t * p_data_out,
- uint8_t * p_mac,
- uint8_t mac_size)
- {
- CRYSError_t result;
- ret_code_t ret_val;
- bool mutex_locked;
- CRYS_CHACHA_EncryptMode_t operation_cc310;
- nrf_crypto_backend_chacha_poly_context_t * p_ctx =
- (nrf_crypto_backend_chacha_poly_context_t *)p_context;
- mutex_locked = cc310_backend_mutex_trylock();
- VERIFY_TRUE(mutex_locked, NRF_ERROR_CRYPTO_BUSY);
- if ((adata_size == 0) || (data_in_size == 0))
- {
- ret_val = NRF_ERROR_CRYPTO_INPUT_LENGTH;
- goto exit;
- }
- if (mac_size != NRF_CRYPTO_CHACHA_POLY_MAC_SIZE)
- {
- ret_val = NRF_ERROR_CRYPTO_AEAD_MAC_SIZE;
- goto exit;
- }
- if (nonce_size != NRF_CRYPTO_CHACHA_POLY_NONCE_SIZE)
- {
- ret_val = NRF_ERROR_CRYPTO_AEAD_NONCE_SIZE;
- goto exit;
- }
- if (!nrfx_is_in_ram(p_data_in) || !nrfx_is_in_ram(p_data_out) ||
- !nrfx_is_in_ram(p_mac) || !nrfx_is_in_ram(p_adata) ||
- !nrfx_is_in_ram(p_nonce))
- {
- ret_val = NRF_ERROR_CRYPTO_INPUT_LOCATION;
- goto exit;
- }
- if (operation == NRF_CRYPTO_DECRYPT)
- {
- operation_cc310 = CRYS_CHACHA_Decrypt;
- }
- else if (operation == NRF_CRYPTO_ENCRYPT)
- {
- operation_cc310 = CRYS_CHACHA_Encrypt;
- }
- else
- {
- ret_val = NRF_ERROR_CRYPTO_INVALID_PARAM;
- goto exit;
- }
- result = CRYS_CHACHA_POLY(p_nonce,
- p_ctx->key,
- operation_cc310,
- p_adata,
- adata_size,
- p_data_in,
- data_in_size,
- p_data_out,
- (uint32_t *)p_mac);
- ret_val = result_get(result);
- exit:
- cc310_backend_mutex_unlock();
- return ret_val;
- }
- nrf_crypto_aead_info_t const g_nrf_crypto_chacha_poly_256_info =
- {
- .key_size = NRF_CRYPTO_KEY_SIZE_256,
- .mode = NRF_CRYPTO_AEAD_MODE_CHACHA_POLY,
- .init_fn = backend_cc310_init,
- .uninit_fn = backend_cc310_uninit,
- .crypt_fn = backend_cc310_crypt
- };
- #endif
- #endif
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