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tls13: add ecdh_read_public

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Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
This commit is contained in:
Jerry Yu 2021-09-09 15:42:32 +08:00
parent a0650ebb9d
commit 1efa815db7
2 changed files with 64 additions and 0 deletions
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58
library/ecdh.c
View file

@ -806,6 +806,64 @@ int mbedtls_ecdh_setup_no_everest( mbedtls_ecdh_context *ctx,
#endif
}
static int ecdh_tls1_3_read_public_internal( mbedtls_ecdh_context_mbed *ctx,
const unsigned char *buf,
size_t blen )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const unsigned char *p = buf;
const unsigned char *end = buf + blen;
size_t data_len;
if( end - p < 3 )
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
data_len = MBEDTLS_GET_UINT16_BE( p, 0 );
p += 2;
if( data_len < 1 || data_len != ( blen - 2 ) )
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA );
/*
* Save buffer start for read_binary and update buf
*/
if( ( ret = mbedtls_ecp_point_read_binary( &ctx->grp,
&ctx->Qp, p, data_len ) ) != 0)
{
return( ret );
}
return( 0 );
}
/*
* Parse and import the client's TLS 1.3 public value
*/
int mbedtls_ecdh_tls1_3_read_public( mbedtls_ecdh_context *ctx,
const unsigned char *buf,
size_t blen )
{
ECDH_VALIDATE_RET( ctx != NULL );
ECDH_VALIDATE_RET( buf != NULL );
#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
return( ecdh_tls1_3_read_public_internal( ctx, buf, blen ) );
#else
switch( ctx->var )
{
#if defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED)
case MBEDTLS_ECDH_VARIANT_EVEREST:
return( MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
#endif
case MBEDTLS_ECDH_VARIANT_MBEDTLS_2_0:
return( ecdh_tls1_3_read_public_internal( &ctx->ctx.mbed_ecdh,
buf, blen ) );
default:
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
}
#endif
}
#endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
#endif /* MBEDTLS_ECDH_C */

6
library/ecdh_misc.h
View file

@ -43,6 +43,12 @@ int mbedtls_ecdh_tls13_make_params( mbedtls_ecdh_context *ctx, size_t *olen,
int ( *f_rng )( void *, unsigned char *, size_t ),
void *p_rng );
/*
* TLS 1.3 version of mbedtls_ecdh_read_public in ecdh.h
*/
int mbedtls_ecdh_tls1_3_read_public( mbedtls_ecdh_context *ctx,
const unsigned char *buf,
size_t blen );
#endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */