Add import_key entry point to p256-m driver
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
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2 changed files with 78 additions and 0 deletions
45
3rdparty/p256-m/p256-m_driver_entrypoints.c
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3rdparty/p256-m/p256-m_driver_entrypoints.c
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@ -24,6 +24,7 @@
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#include "psa/crypto.h"
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#include "psa_crypto_driver_wrappers.h"
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#include <stddef.h>
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#include <string.h>
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#if defined(MBEDTLS_P256M_EXAMPLE_DRIVER_ENABLED)
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@ -59,6 +60,50 @@ static psa_status_t p256_to_psa_error(int ret)
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}
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}
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psa_status_t p256_transparent_import_key(const psa_key_attributes_t *attributes,
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const uint8_t *data,
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size_t data_length,
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uint8_t *key_buffer,
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size_t key_buffer_size,
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size_t *key_buffer_length,
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size_t *bits)
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{
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/* Check the key size */
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if (*bits != 0 && *bits != 256) {
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return PSA_ERROR_NOT_SUPPORTED;
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}
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/* Validate the key (and its type and size) */
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psa_key_type_t type = psa_get_key_type(attributes);
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if (type == PSA_KEY_TYPE_ECC_PUBLIC_KEY(PSA_ECC_FAMILY_SECP_R1)) {
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if (data_length != 65) {
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return *bits == 0 ? PSA_ERROR_NOT_SUPPORTED : PSA_ERROR_INVALID_ARGUMENT;
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}
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if (p256_validate_pubkey(data + 1) != P256_SUCCESS) {
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return PSA_ERROR_INVALID_ARGUMENT;
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}
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} else if (type == PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1)) {
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if (data_length != 32) {
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return *bits == 0 ? PSA_ERROR_NOT_SUPPORTED : PSA_ERROR_INVALID_ARGUMENT;
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}
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if (p256_validate_privkey(data) != P256_SUCCESS) {
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return PSA_ERROR_INVALID_ARGUMENT;
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}
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} else {
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return PSA_ERROR_NOT_SUPPORTED;
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}
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*bits = 256;
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/* We only support the export format for input, so just copy. */
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if (key_buffer_size < data_length) {
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return PSA_ERROR_BUFFER_TOO_SMALL;
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}
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memcpy(key_buffer, data, data_length);
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*key_buffer_length = data_length;
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return PSA_SUCCESS;
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}
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psa_status_t p256_transparent_generate_key(
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const psa_key_attributes_t *attributes,
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uint8_t *key_buffer,
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33
3rdparty/p256-m/p256-m_driver_entrypoints.h
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3rdparty/p256-m/p256-m_driver_entrypoints.h
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@ -29,6 +29,39 @@
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#include "psa/crypto_types.h"
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/** Import SECP256R1 key.
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*
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* \param[in] attributes The attributes of the key to use for the
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* operation.
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* \param[in] data The raw key material. For private keys
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* this must be a big-endian integer of 32
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* bytes; for public key this must be an
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* uncompressed ECPoint (65 bytes).
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* \param[in] data_length The size of the raw key material.
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* \param[out] key_buffer The buffer to contain the key data in
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* output format upon successful return.
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* \param[in] key_buffer_size Size of the \p key_buffer buffer in bytes.
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* \param[out] key_buffer_length The length of the data written in \p
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* key_buffer in bytes.
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* \param[out] bits The bitsize of the key.
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*
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* \retval #PSA_SUCCESS
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* Success. Keypair generated and stored in buffer.
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* \retval #PSA_ERROR_NOT_SUPPORTED
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* The input is not supported by this driver (not SECP256R1).
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* \retval #PSA_ERROR_INVALID_ARGUMENT
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* The input is invalid.
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* \retval #PSA_ERROR_BUFFER_TOO_SMALL
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* \p key_buffer_size is too small.
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*/
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psa_status_t p256_transparent_import_key(const psa_key_attributes_t *attributes,
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const uint8_t *data,
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size_t data_length,
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uint8_t *key_buffer,
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size_t key_buffer_size,
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size_t *key_buffer_length,
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size_t *bits);
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/** Generate SECP256R1 ECC Key Pair.
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* Interface function which calls the p256-m key generation function and
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* places it in the key buffer provided by the caller (mbed TLS) in the
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