Read and write X25519 and X448 private keys
Signed-off-by: Jethro Beekman <jethro@fortanix.com>
Co-authored-by: Gijs Kwakkel <gijs.kwakkel@fortanix.com>
Signed-off-by: Gijs Kwakkel <gijs.kwakkel@fortanix.com>
diff --git a/include/mbedtls/asn1write.h b/include/mbedtls/asn1write.h
index da73759..3c5072c 100644
--- a/include/mbedtls/asn1write.h
+++ b/include/mbedtls/asn1write.h
@@ -164,6 +164,27 @@
size_t par_len);
/**
+ * \brief Write an AlgorithmIdentifier sequence in ASN.1 format.
+ *
+ * \note This function works backwards in data buffer.
+ *
+ * \param p The reference to the current position pointer.
+ * \param start The start of the buffer, for bounds-checking.
+ * \param oid The OID of the algorithm to write.
+ * \param oid_len The length of the algorithm's OID.
+ * \param par_len The length of the parameters, which must be already written.
+ * \param has_par If there are any parameters. If 0, par_len must be 0. If 1
+ * and \p par_len is 0, NULL parameters are added.
+ *
+ * \return The number of bytes written to \p p on success.
+ * \return A negative \c MBEDTLS_ERR_ASN1_XXX error code on failure.
+ */
+int mbedtls_asn1_write_algorithm_identifier_ext(unsigned char **p,
+ const unsigned char *start,
+ const char *oid, size_t oid_len,
+ size_t par_len, int has_par);
+
+/**
* \brief Write a boolean tag (#MBEDTLS_ASN1_BOOLEAN) and value
* in ASN.1 format.
*
diff --git a/include/mbedtls/oid.h b/include/mbedtls/oid.h
index a72f51c..1cbf968 100644
--- a/include/mbedtls/oid.h
+++ b/include/mbedtls/oid.h
@@ -90,6 +90,9 @@
#define MBEDTLS_OID_OIW_SECSIG MBEDTLS_OID_ORG_OIW "\x03"
#define MBEDTLS_OID_OIW_SECSIG_ALG MBEDTLS_OID_OIW_SECSIG "\x02"
#define MBEDTLS_OID_OIW_SECSIG_SHA1 MBEDTLS_OID_OIW_SECSIG_ALG "\x1a"
+#define MBEDTLS_OID_ORG_THAWTE "\x65" /* thawte(101) */
+#define MBEDTLS_OID_THAWTE MBEDTLS_OID_ISO_IDENTIFIED_ORG \
+ MBEDTLS_OID_ORG_THAWTE
#define MBEDTLS_OID_ORG_CERTICOM "\x81\x04" /* certicom(132) */
#define MBEDTLS_OID_CERTICOM MBEDTLS_OID_ISO_IDENTIFIED_ORG \
MBEDTLS_OID_ORG_CERTICOM
@@ -437,6 +440,15 @@
* ecdsa-with-SHA2(3) 4 } */
#define MBEDTLS_OID_ECDSA_SHA512 MBEDTLS_OID_ANSI_X9_62_SIG_SHA2 "\x04"
+/*
+ * EC key algorithms from RFC 8410
+ */
+
+#define MBEDTLS_OID_X25519 MBEDTLS_OID_THAWTE "\x6e" /**< id-X25519 OBJECT IDENTIFIER ::= { 1 3 101 110 } */
+#define MBEDTLS_OID_X448 MBEDTLS_OID_THAWTE "\x6f" /**< id-X448 OBJECT IDENTIFIER ::= { 1 3 101 111 } */
+#define MBEDTLS_OID_ED25519 MBEDTLS_OID_THAWTE "\x70" /**< id-Ed25519 OBJECT IDENTIFIER ::= { 1 3 101 112 } */
+#define MBEDTLS_OID_ED448 MBEDTLS_OID_THAWTE "\x71" /**< id-Ed448 OBJECT IDENTIFIER ::= { 1 3 101 113 } */
+
#ifdef __cplusplus
extern "C" {
#endif
@@ -531,6 +543,30 @@
*/
int mbedtls_oid_get_oid_by_ec_grp(mbedtls_ecp_group_id grp_id,
const char **oid, size_t *olen);
+
+/**
+ * \brief Translate AlgorithmIdentifier OID into an EC group identifier,
+ * for curves that are directly encoded at this level
+ *
+ * \param oid OID to use
+ * \param grp_id place to store group id
+ *
+ * \return 0 if successful, or MBEDTLS_ERR_OID_NOT_FOUND
+ */
+int mbedtls_oid_get_ec_grp_algid(const mbedtls_asn1_buf *oid, mbedtls_ecp_group_id *grp_id);
+
+/**
+ * \brief Translate EC group identifier into AlgorithmIdentifier OID,
+ * for curves that are directly encoded at this level
+ *
+ * \param grp_id EC group identifier
+ * \param oid place to store ASN.1 OID string pointer
+ * \param olen length of the OID
+ *
+ * \return 0 if successful, or MBEDTLS_ERR_OID_NOT_FOUND
+ */
+int mbedtls_oid_get_oid_by_ec_grp_algid(mbedtls_ecp_group_id grp_id,
+ const char **oid, size_t *olen);
#endif /* MBEDTLS_ECP_LIGHT */
/**