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Merge pull request #6723 from mpg/restartable-vs-use-psa

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Document ECP_RESTARTABLE and make it compatible with USE_PSA
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Gilles Peskine 2022-12-15 19:47:44 +01:00 • committed by GitHub
commit d1dd41f3fc
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12 changed files with 202 additions and 37 deletions
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34
include/mbedtls/mbedtls_config.h
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@ -690,11 +690,42 @@
* This is useful in non-threaded environments if you want to avoid blocking
* for too long on ECC (and, hence, X.509 or SSL/TLS) operations.
*
* Uncomment this macro to enable restartable ECC computations.
* This option:
* - Adds xxx_restartable() variants of existing operations in the
* following modules, with corresponding restart context types:
* - ECP (for Short Weierstrass curves only): scalar multiplication (mul),
* linear combination (muladd);
* - ECDSA: signature generation & verification;
* - PK: signature generation & verification;
* - X509: certificate chain verification.
* - Adds mbedtls_ecdh_enable_restart() in the ECDH module.
* - Changes the behaviour of TLS 1.2 clients (not servers) when using the
* ECDHE-ECDSA key exchange (not other key exchanges) to make all ECC
* computations restartable:
* - ECDH operations from the key exchange, only for Short Weierstass
* curves, only when MBEDTLS_USE_PSA_CRYPTO is not enabled.
* - verification of the server's key exchange signature;
* - verification of the server's certificate chain;
* - generation of the client's signature if client authentication is used,
* with an ECC key/certificate.
*
* \note In the cases above, the usual SSL/TLS functions, such as
* mbedtls_ssl_handshake(), can now return
* MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS.
*
* \note When this option and MBEDTLS_USE_PSA_CRYPTO are both enabled,
* restartable operations in PK, X.509 and TLS (see above) are not
* using PSA. On the other hand, ECDH computations in TLS are using
* PSA, and are not restartable. These are temporary limitations that
* should be lifted in the future.
*
* \note This option only works with the default software implementation of
* elliptic curve functionality. It is incompatible with
* MBEDTLS_ECP_ALT, MBEDTLS_ECDH_XXX_ALT, MBEDTLS_ECDSA_XXX_ALT.
*
* Requires: MBEDTLS_ECP_C
*
* Uncomment this macro to enable restartable ECC computations.
*/
//#define MBEDTLS_ECP_RESTARTABLE
@ -1923,7 +1954,6 @@
* before calling any function from the SSL/TLS, X.509 or PK modules.
*
* Requires: MBEDTLS_PSA_CRYPTO_C.
* Conflicts with: MBEDTLS_ECP_RESTARTABLE
*
* Uncomment this to enable internal use of PSA Crypto and new associated APIs.
*/