crypto_extra.h File Reference

Statistics about resource consumption related to the PSA keystore.

Note:

The content of this structure is not part of the stable API and ABI of Mbed Crypto and may change arbitrarily from version to version.

Library deinitialization.

This function clears all data associated with the PSA layer, including the whole key store.

This is an Mbed TLS extension.

Definition at line 5606 of file psa_crypto.c.

Get statistics about resource consumption related to the PSA keystore.

Note:

When Mbed Crypto is built as part of a service, with isolation between the application and the keystore, the service may or may not expose this function.

Definition at line 268 of file psa_crypto_slot_management.c.

Inject an initial entropy seed for the random generator into secure storage.

This function injects data to be used as a seed for the random generator used by the PSA Crypto implementation. On devices that lack a trusted entropy source (preferably a hardware random number generator), the Mbed PSA Crypto implementation uses this value to seed its random generator.

On devices without a trusted entropy source, this function must be called exactly once in the lifetime of the device. On devices with a trusted entropy source, calling this function is optional. In all cases, this function may only be called before calling any other function in the PSA Crypto API, including psa_crypto_init().

When this function returns successfully, it populates a file in persistent storage. Once the file has been created, this function can no longer succeed.

If any error occurs, this function does not change the system state. You can call this function again after correcting the reason for the error if possible.

Warning:

This function **can** fail! Callers MUST check the return status.

If you use this function, you should use it as part of a factory provisioning process. The value of the injected seed is critical to the security of the device. It must be *secret*, *unpredictable* and (statistically) *unique per device*. You should be generate it randomly using a cryptographically secure random generator seeded from trusted entropy sources. You should transmit it securely to the device and ensure that its value is not leaked or stored anywhere beyond the needs of transmitting it from the point of generation to the call of this function, and erase all copies of the value once this function returns.

This is an Mbed TLS extension.

Note:

This function is only available on the following platforms: * If the compile-time option MBEDTLS_PSA_INJECT_ENTROPY is enabled. Note that you must provide compatible implementations of mbedtls_nv_seed_read and mbedtls_nv_seed_write. * In a client-server integration of PSA Cryptography, on the client side, if the server supports this feature.

Parameters:

[in]	seed	Buffer containing the seed value to inject.
[in]	seed_size	Size of the seed buffer. The size of the seed in bytes must be greater or equal to both MBEDTLS_ENTROPY_MIN_PLATFORM and MBEDTLS_ENTROPY_BLOCK_SIZE. It must be less or equal to MBEDTLS_ENTROPY_MAX_SEED_SIZE.

Return values:

PSA_SUCCESS	The seed value was injected successfully. The random generator of the PSA Crypto implementation is now ready for use. You may now call psa_crypto_init() and use the PSA Crypto implementation.
PSA_ERROR_INVALID_ARGUMENT	seed_size is out of range.
PSA_ERROR_STORAGE_FAILURE	There was a failure reading or writing from storage.
PSA_ERROR_NOT_PERMITTED	The library has already been initialized. It is no longer possible to call this function.

Definition at line 5391 of file psa_crypto.c.