typedef enum { ... } SilcPkcs1BlockType

    Defines the PKCS#1 block types that define how the blcok is encoded
    for different RSA operations.

    typedef enum {
      SILC_PKCS1_BT_PRV0 = 0x00,    /* Private key BT 0 */
      SILC_PKCS1_BT_PRV1 = 0x01,    /* Private key BT 1 (use this always) */
      SILC_PKCS1_BT_PUB  = 0x02,    /* Public key BT */
    } SilcPkcs1BlockType;