+
+/*
+ * OID for hash functions in RSA signatures.
+ */
+static const unsigned char HASH_OID_SHA1[] = {
+ 0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A
+};
+
+static const unsigned char HASH_OID_SHA224[] = {
+ 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04
+};
+
+static const unsigned char HASH_OID_SHA256[] = {
+ 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01
+};
+
+static const unsigned char HASH_OID_SHA384[] = {
+ 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02
+};
+
+static const unsigned char HASH_OID_SHA512[] = {
+ 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03
+};
+
+static const unsigned char *HASH_OID[] = {
+ HASH_OID_SHA1,
+ HASH_OID_SHA224,
+ HASH_OID_SHA256,
+ HASH_OID_SHA384,
+ HASH_OID_SHA512
+};
+
+/* see brssl.h */
+const unsigned char *
+get_hash_oid(int id)
+{
+ if (id >= 2 && id <= 6) {
+ return HASH_OID[id - 2];
+ } else {
+ return NULL;
+ }
+}
+
+/* see brssl.h */
+const br_hash_class *
+get_hash_impl(int hash_id)
+{
+ size_t u;
+
+ if (hash_id == 0) {
+ return &br_md5sha1_vtable;
+ }
+ for (u = 0; hash_functions[u].name; u ++) {
+ const br_hash_class *hc;
+ int id;
+
+ hc = hash_functions[u].hclass;
+ id = (hc->desc >> BR_HASHDESC_ID_OFF) & BR_HASHDESC_ID_MASK;
+ if (id == hash_id) {
+ return hc;
+ }
+ }
+ return NULL;
+}