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Clarify guarantees made by rsa_check_privkey and rsa_complete

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Document explicitly that `mbedtls_rsa_check_privkey` and `mbedtls_rsa_complete` succeeding does not guarantee the
consistency of the underlying RSA private key but only that enough information is present to perform a private key
operation.
This commit is contained in:
Hanno Becker 2017-10-02 13:16:35 +01:00
parent 1b831fe1c5
commit 43a08d029e
1 changed files with 42 additions and 13 deletions
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55
include/mbedtls/rsa.h
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@ -375,8 +375,8 @@ int mbedtls_rsa_import_raw( mbedtls_rsa_context *ctx,
* a set of imported core parameters.
*
* \param ctx Initialized RSA context to store parameters
* \param f_rng RNG function,
* \param p_rng RNG parameter
* \param f_rng RNG function, or NULL
* \param p_rng RNG parameter, or NULL
*
* \note
* - To setup an RSA public key, precisely N and E
@ -392,15 +392,26 @@ int mbedtls_rsa_import_raw( mbedtls_rsa_context *ctx,
* - Alternative implementations need not support these
* and may return \c MBEDTLS_ERR_RSA_BAD_INPUT_DATA instead.
*
* \note The PRNG is used for probabilistic algorithms
* like the derivation of P, Q from N, D, E, as
* well as primality checks.
* \note The PRNG is used for the probabilistic algorithm
* used in the derivation of P, Q from N, D, E. If it
* not present, a deterministic heuristic is used.
*
* \return - 0 if successful. In this case, all imported core
* parameters are guaranteed to be sane, the RSA context
* has been fully setup and is ready for use.
* \return
* - 0 if successful. In this case, it is guaranteed
* the functions \c mbedtls_rsa_check_pubkey resp.
* \c mbedtls_rsa_check_privkey pass in case of a
* public resp. private key.
* - \c MBEDTLS_ERR_RSA_BAD_INPUT_DATA if the attempted
* derivations failed.
*
* \warning Implementations are *not* obliged to perform exhaustive
* validation of the imported parameters!
* In particular, parameters that are not needed by the
* implementation may be silently discarded and left unchecked.
* If the user mistrusts the given key material, he should
* employ other means for verification like the helper functions
* \c mbedtls_rsa_validate_params, \c mbedtls_rsa_validate_crt.
*
*/
int mbedtls_rsa_complete( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
@ -573,21 +584,39 @@ int mbedtls_rsa_gen_key( mbedtls_rsa_context *ctx,
unsigned int nbits, int exponent );
/**
* \brief Check if a context contains an RSA public key
* \brief Check if a context contains (at least) an RSA public key
*
* \param ctx RSA context to be checked
*
* \return 0 if successful, or an \c MBEDTLS_ERR_RSA_XXX error code
* \return 0 if successful, or an \c MBEDTLS_ERR_RSA_XXX error code.
* On success, it is guaranteed that enough information is
* present to perform an RSA public key operation
* \c mbedtls_rsa_public.
*
*/
int mbedtls_rsa_check_pubkey( const mbedtls_rsa_context *ctx );
/**
* \brief Check if a context contains a complete
* and valid RSA private key.
* \brief Check if a context contains an RSA private key
* and perform basic sanity checks.
*
* \param ctx RSA context to be checked
*
* \return 0 if successful, or an \c MBEDTLS_ERR_RSA_XXX error code
* \return 0 if successful, or an \c MBEDTLS_ERR_RSA_XXX error code.
* On success, it is guaranteed that enough information is
* present to perform RSA private and public key operations.
*
* \warning This function is *not* obliged to perform an exhaustive
* sanity check what would guarantee the internal parameters
* to match and \c mbedtls_rsa_private and \c mbedtls_rsa_public
* to be mutually inverse to each other.
* The reason is that for minimal non-CRT implementations
* using only N, D, E, for example, checking the validity
* would be computationally expensive.
* Users mistrusting their key material should use other
* means for verification; see the documentation of
* \c mbedtls_rsa_complete.
*
*/
int mbedtls_rsa_check_privkey( const mbedtls_rsa_context *ctx );