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Add mbedtls_ssl_check_curve_tls_id() (internal)

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This can be used to validate the server's choice of group in the PSA
case (this will be done in the next commit).

Backport of 0d63b84fa49ecb758dbec4fd7a94df59fe8367ab with a very
different implementation, as 2.28 still stores the list of allowed
groups with their mbedtls_ecp group IDs, not the IANA/TLS group IDs
(changed by https://github.com/ARMmbed/mbedtls/pull/4859/ in 3.x).

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2022-02-14 11:34:47 +01:00
parent 97f188289d
commit 298d6cc397
2 changed files with 13 additions and 0 deletions
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1
include/mbedtls/ssl_internal.h
View file

@ -1112,6 +1112,7 @@ int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md );
#if defined(MBEDTLS_ECP_C)
int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id );
int mbedtls_ssl_check_curve_tls_id( const mbedtls_ssl_context *ssl, uint16_t tls_id );
#endif
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)

12
library/ssl_tls.c
View file

@ -7326,6 +7326,18 @@ int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_i
return( -1 );
}
/*
* Same as mbedtls_ssl_check_curve() but takes a TLS ID for the curve.
*/
int mbedtls_ssl_check_curve_tls_id( const mbedtls_ssl_context *ssl, uint16_t tls_id )
{
const mbedtls_ecp_curve_info *curve_info =
mbedtls_ecp_curve_info_from_tls_id( tls_id );
if( curve_info == NULL )
return( -1 );
return( mbedtls_ssl_check_curve( ssl, curve_info->grp_id ) );
}
#endif /* MBEDTLS_ECP_C */
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)