-typedef STACK_OF(CONF_VALUE) * (*X509V3_EXT_I2V)(struct v3_ext_method *method, void *ext, STACK_OF(CONF_VALUE) *extlist);
-typedef void * (*X509V3_EXT_V2I)(struct v3_ext_method *method, struct v3_ext_ctx *ctx, STACK_OF(CONF_VALUE) *values);
-typedef char * (*X509V3_EXT_I2S)(struct v3_ext_method *method, void *ext);
-typedef void * (*X509V3_EXT_S2I)(struct v3_ext_method *method, struct v3_ext_ctx *ctx, const char *str);
-typedef int (*X509V3_EXT_I2R)(struct v3_ext_method *method, void *ext, BIO *out, int indent);
-typedef void * (*X509V3_EXT_R2I)(struct v3_ext_method *method, struct v3_ext_ctx *ctx, const char *str);
+typedef STACK_OF(CONF_VALUE) *
+ (*X509V3_EXT_I2V)(const struct v3_ext_method *method, void *ext,
+ STACK_OF(CONF_VALUE) *extlist);
+typedef void * (*X509V3_EXT_V2I)(const struct v3_ext_method *method,
+ struct v3_ext_ctx *ctx,
+ STACK_OF(CONF_VALUE) *values);
+typedef char * (*X509V3_EXT_I2S)(const struct v3_ext_method *method, void *ext);
+typedef void * (*X509V3_EXT_S2I)(const struct v3_ext_method *method,
+ struct v3_ext_ctx *ctx, const char *str);
+typedef int (*X509V3_EXT_I2R)(const struct v3_ext_method *method, void *ext,
+ BIO *out, int indent);
+typedef void * (*X509V3_EXT_R2I)(const struct v3_ext_method *method,
+ struct v3_ext_ctx *ctx, const char *str);