Move oid_xxx_numeric_string back to oid.h
The header `mbedtls/oid.h` now belongs to the X.509 library. Move the
declarations of `mbedtls_oid_get_numeric_string()` and
`mbedtls_oid_from_numeric_string()` back to this header, which is where they
were in all previous releases of Mbed TLS. This avoids gratuitously breaking
backward compatibility.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/include/mbedtls/oid.h b/include/mbedtls/oid.h
index 5ef87d3..375ea60 100644
--- a/include/mbedtls/oid.h
+++ b/include/mbedtls/oid.h
@@ -264,4 +264,40 @@
* ecdsa-with-SHA2(3) 4 } */
#define MBEDTLS_OID_ECDSA_SHA512 MBEDTLS_OID_ANSI_X9_62_SIG_SHA2 "\x04"
+#if defined(MBEDTLS_X509_USE_C)
+/**
+ * \brief Translate an ASN.1 OID into its numeric representation
+ * (e.g. "\x2A\x86\x48\x86\xF7\x0D" into "1.2.840.113549")
+ *
+ * \param buf buffer to put representation in
+ * \param size size of the buffer
+ * \param oid OID to translate
+ *
+ * \return Length of the string written (excluding final NULL) or
+ * PSA_ERROR_BUFFER_TOO_SMALL in case of error
+ */
+int mbedtls_oid_get_numeric_string(char *buf, size_t size, const mbedtls_asn1_buf *oid);
+#endif /* MBEDTLS_X509_USE_C */
+
+#if defined(MBEDTLS_X509_CREATE_C)
+/**
+ * \brief Translate a string containing a dotted-decimal
+ * representation of an ASN.1 OID into its encoded form
+ * (e.g. "1.2.840.113549" into "\x2A\x86\x48\x86\xF7\x0D").
+ * On success, this function allocates oid->buf from the
+ * heap. It must be freed by the caller using mbedtls_free().
+ *
+ * \param oid #mbedtls_asn1_buf to populate with the DER-encoded OID
+ * \param oid_str string representation of the OID to parse
+ * \param size length of the OID string, not including any null terminator
+ *
+ * \return 0 if successful
+ * \return #MBEDTLS_ERR_ASN1_INVALID_DATA if \p oid_str does not
+ * represent a valid OID
+ * \return #MBEDTLS_ERR_ASN1_ALLOC_FAILED if the function fails to
+ * allocate oid->buf
+ */
+int mbedtls_oid_from_numeric_string(mbedtls_asn1_buf *oid, const char *oid_str, size_t size);
+#endif /* MBEDTLS_X509_CREATE_C */
+
#endif /* oid.h */