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New function mbedtls_pk_copy_public_from_psa

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Document and implement mbedtls_pk_copy_public_from_psa() to export the
public key of a PSA key into PK.

Unit-test it alongside mbedtls_pk_copy_from_psa().

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2024-03-06 13:39:01 +01:00
parent d7e7f48323
commit bf69f2e682
4 changed files with 157 additions and 6 deletions
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33
include/mbedtls/pk.h
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@@ -426,6 +426,39 @@ int mbedtls_pk_setup_opaque(mbedtls_pk_context *ctx,
* parameters are not correct.
*/
int mbedtls_pk_copy_from_psa(mbedtls_svc_key_id_t key_id, mbedtls_pk_context *pk);
/**
* \brief Create a PK context for the public key of a PSA key.
*
* The key must be an RSA or ECC key. It can be either a
* public key or a key pair, and only the public key is copied.
* The resulting PK object will be a transparent type:
* - #MBEDTLS_PK_RSA for RSA keys or
* - #MBEDTLS_PK_ECKEY for EC keys.
*
* Once this functions returns the PK object will be completely
* independent from the original PSA key that it was generated
* from.
* Calling mbedtls_pk_verify() or
* mbedtls_pk_encrypt() on the resulting
* PK context will perform the corresponding algorithm for that
* PK context type.
*
* For an RSA key, the output PK context will allow both
* encrypt and verify regardless of the original key's policy.
* The original key's policy determines the output key's padding
* mode: PCKS1 v2.1 is set if the PSA key policy is OAEP or PSS,
* otherwise PKCS1 v1.5 is set.
*
* \param key_id The key identifier of the key stored in PSA.
* \param pk The PK context that will be filled. It must be initialized,
* but not set up.
*
* \return 0 on success.
* \return MBEDTLS_ERR_PK_BAD_INPUT_DATA in case the provided input
* parameters are not correct.
*/
int mbedtls_pk_copy_public_from_psa(mbedtls_svc_key_id_t key_id, mbedtls_pk_context *pk);
#endif /* MBEDTLS_PSA_CRYPTO_C */
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)