Secure Element Authenticated Encryption with Additional Data

Detailed Description

Authenticated Encryption with Additional Data (AEAD) operations with secure elements must be done in one function call. While this creates a burden for implementers as there must be sufficient space in memory for the entire message, it prevents decrypted data from being made available before the authentication operation is complete and the data is known to be authentic.

Data Structures
struct	psa_drv_se_aead_t
	A struct containing all of the function pointers needed to implement secure element Authenticated Encryption with Additional Data operations. More...

Typedefs
typedef psa_status_t(*	psa_drv_se_aead_encrypt_t) (psa_drv_se_context_t *drv_context, psa_key_slot_number_t key_slot, psa_algorithm_t algorithm, const uint8_t *p_nonce, size_t nonce_length, const uint8_t *p_additional_data, size_t additional_data_length, const uint8_t *p_plaintext, size_t plaintext_length, uint8_t *p_ciphertext, size_t ciphertext_size, size_t *p_ciphertext_length)
	A function that performs a secure element authenticated encryption operation.
typedef psa_status_t(*	psa_drv_se_aead_decrypt_t) (psa_drv_se_context_t *drv_context, psa_key_slot_number_t key_slot, psa_algorithm_t algorithm, const uint8_t *p_nonce, size_t nonce_length, const uint8_t *p_additional_data, size_t additional_data_length, const uint8_t *p_ciphertext, size_t ciphertext_length, uint8_t *p_plaintext, size_t plaintext_size, size_t *p_plaintext_length)
	A function that performs a secure element authenticated decryption operation.

Typedef Documentation

psa_drv_se_aead_decrypt_t

typedef psa_status_t(* psa_drv_se_aead_decrypt_t) (psa_drv_se_context_t *drv_context, psa_key_slot_number_t key_slot, psa_algorithm_t algorithm, const uint8_t *p_nonce, size_t nonce_length, const uint8_t *p_additional_data, size_t additional_data_length, const uint8_t *p_ciphertext, size_t ciphertext_length, uint8_t *p_plaintext, size_t plaintext_size, size_t *p_plaintext_length)

A function that performs a secure element authenticated decryption operation.

Parameters

drv_context	The driver context structure.
key_slot	Slot containing the key to use
algorithm	The AEAD algorithm to compute (PSA_ALG_XXX value such that PSA_ALG_IS_AEAD(alg) is true)
p_nonce	Nonce or IV to use
nonce_length	Size of the p_nonce buffer in bytes
p_additional_data	Additional data that has been authenticated but not encrypted
additional_data_length	Size of p_additional_data in bytes
p_ciphertext	Data that has been authenticated and encrypted. For algorithms where the encrypted data and the authentication tag are defined as separate inputs, the buffer must contain the encrypted data followed by the authentication tag.
ciphertext_length	Size of p_ciphertext in bytes
p_plaintext	Output buffer for the decrypted data
plaintext_size	Size of the p_plaintext buffer in bytes
p_plaintext_length	On success, the size of the output in the p_plaintext buffer

Returns

PSA_SUCCESS Success.

Definition at line 787 of file psa_crypto_se_driver.h.

psa_drv_se_aead_encrypt_t

typedef psa_status_t(* psa_drv_se_aead_encrypt_t) (psa_drv_se_context_t *drv_context, psa_key_slot_number_t key_slot, psa_algorithm_t algorithm, const uint8_t *p_nonce, size_t nonce_length, const uint8_t *p_additional_data, size_t additional_data_length, const uint8_t *p_plaintext, size_t plaintext_length, uint8_t *p_ciphertext, size_t ciphertext_size, size_t *p_ciphertext_length)

A function that performs a secure element authenticated encryption operation.

Parameters

drv_context	The driver context structure.
key_slot	Slot containing the key to use.
algorithm	The AEAD algorithm to compute (PSA_ALG_XXX value such that PSA_ALG_IS_AEAD(alg) is true)
p_nonce	Nonce or IV to use
nonce_length	Size of the p_nonce buffer in bytes
p_additional_data	Additional data that will be authenticated but not encrypted
additional_data_length	Size of p_additional_data in bytes
p_plaintext	Data that will be authenticated and encrypted
plaintext_length	Size of p_plaintext in bytes
p_ciphertext	Output buffer for the authenticated and encrypted data. The additional data is not part of this output. For algorithms where the encrypted data and the authentication tag are defined as separate outputs, the authentication tag is appended to the encrypted data.
ciphertext_size	Size of the p_ciphertext buffer in bytes
p_ciphertext_length	On success, the size of the output in the p_ciphertext buffer

Returns

PSA_SUCCESS Success.

Definition at line 745 of file psa_crypto_se_driver.h.