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add: general function suit_create_es_public_key() #11

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add: general function suit_create_es_public_key() #11

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35 changes: 19 additions & 16 deletions src/suit_cose.c
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Original file line number Diff line number Diff line change
Expand Up @@ -49,47 +49,50 @@ cose_tag_key_t suit_judge_cose_tag_from_buf(const UsefulBufC *signed_cose) {

#if defined(LIBCSUIT_PSA_CRYPTO_C)
/*
Public function. See suit_cose.h
\brief Internal function calls MbedTLS functions to create public key.

\param[in] nid EC network id.
\param[in] public_key Pointer of char array type of public key.
\param[in] public_key_len Length of the public key.
\param[out] cose_public_key Pointer and length of the resulting key.

\return This returns SUIT_SUCCESS or SUIT_ERR_FAILED_TO_VERIFY.
*/
suit_err_t suit_create_es256_public_key(const char *public_key, struct t_cose_key *cose_public_key) {
suit_err_t suit_create_es_public_key(const int nid, const char *public_key, const size_t public_key_len, struct t_cose_key *cose_public_key) {
psa_key_attributes_t key_attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_handle_t key_handle = 0;
psa_status_t result;
size_t public_key_len = 65;

result = psa_crypto_init();

if(result != PSA_SUCCESS)
return( EXIT_FAILURE );
return( SUIT_ERR_FAILED_TO_VERIFY );

psa_set_key_usage_flags( &key_attributes,
PSA_KEY_USAGE_VERIFY_HASH | PSA_KEY_USAGE_EXPORT );
psa_set_key_algorithm( &key_attributes, PSA_ALG_ECDSA(PSA_ALG_SHA_256) );
psa_set_key_type( &key_attributes, PSA_KEY_TYPE_ECC_PUBLIC_KEY(PSA_ECC_FAMILY_SECP_R1) );

/*
psa_key_type_t key_type;
psa_algorithm_t key_alg;
key_type = PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_CURVE_SECP256R1);
key_alg = PSA_ALG_ECDSA(PSA_ALG_SHA_256);
psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_VERIFY_HASH );
psa_set_key_algorithm( &key_attributes, key_alg );
psa_set_key_type( &key_attributes, key_type );
*/
psa_set_key_type( &key_attributes, PSA_KEY_TYPE_ECC_PUBLIC_KEY(nid) );

result = psa_import_key(&key_attributes,
(const unsigned char*) public_key,
public_key_len,
&key_handle);

if (result != PSA_SUCCESS)
return( EXIT_FAILURE );
return( SUIT_ERR_FAILED_TO_VERIFY );

cose_public_key->k.key_handle = key_handle;
cose_public_key->crypto_lib = T_COSE_CRYPTO_LIB_PSA;

return( SUIT_SUCCESS );
}

/*
Public function. See suit_cose.h
*/
suit_err_t suit_create_es256_public_key(const char *public_key, struct t_cose_key *cose_public_key) {
return suit_create_es_public_key(PSA_ECC_FAMILY_SECP_R1, public_key, 65, cose_public_key);
}
#else /* LIBCSUIT_PSA_CRYPTO_C */

/*
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