Add functions to psa_util module to convert EC public keys
diff --git a/include/mbedtls/psa_util.h b/include/mbedtls/psa_util.h
index fbf25e6..dca4fa4 100644
--- a/include/mbedtls/psa_util.h
+++ b/include/mbedtls/psa_util.h
@@ -43,6 +43,8 @@
#include "pk.h"
#include "oid.h"
+#include <string.h>
+
/* Translations for symmetric crypto. */
static inline psa_key_type_t mbedtls_psa_translate_cipher_type(
@@ -352,6 +354,48 @@
return( (psa_ecc_curve_t) tls_ecc_grp_reg_id );
}
+/* This function takes a buffer holding an EC public key
+ * exported through psa_export_public_key(), and converts
+ * it into an ECPoint structure to be put into a ClientKeyExchange
+ * message in an ECDHE exchange.
+ *
+ * Both the present and the foreseeable future format of EC public keys
+ * used by PSA have the ECPoint structure contained in the exported key
+ * as a subbuffer, and the function merely selects this subbuffer instead
+ * of making a copy.
+ */
+static inline int mbedtls_psa_tls_psa_ec_to_ecpoint( unsigned char *src,
+ size_t srclen,
+ unsigned char **dst,
+ size_t *dstlen )
+{
+ *dst = src;
+ *dstlen = srclen;
+ return( 0 );
+}
+
+/* This function takes a buffer holding an ECPoint structure
+ * (as contained in a TLS ServerKeyExchange message for ECDHE
+ * exchanges) and converts it into a format that the PSA key
+ * agreement API understands.
+ */
+static inline int mbedtls_psa_tls_ecpoint_to_psa_ec( psa_ecc_curve_t curve,
+ unsigned char const *src,
+ size_t srclen,
+ unsigned char *dst,
+ size_t dstlen,
+ size_t *olen )
+{
+ ((void) curve);
+
+ if( srclen > dstlen )
+ return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
+
+ memcpy( dst, src, srclen );
+ *olen = srclen;
+ return( 0 );
+}
+
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#endif /* MBEDTLS_PSA_UTIL_H */