static int i2r_PKEY_USAGE_PERIOD(X509V3_EXT_METHOD *method, PKEY_USAGE_PERIOD *usage, BIO *out, int indent);
/*
static PKEY_USAGE_PERIOD *v2i_PKEY_USAGE_PERIOD(X509V3_EXT_METHOD *method, X509V3_CTX *ctx, STACK *values);
*/
static int i2r_PKEY_USAGE_PERIOD(X509V3_EXT_METHOD *method, PKEY_USAGE_PERIOD *usage, BIO *out, int indent);
/*
static PKEY_USAGE_PERIOD *v2i_PKEY_USAGE_PERIOD(X509V3_EXT_METHOD *method, X509V3_CTX *ctx, STACK *values);
*/