ASN1_i2d_bio
ret = ASN1_i2d_bio(i2d, b, x);
int ASN1_i2d_bio(i2d_of_void *i2d, BIO *out, unsigned char *x);
(ASN1_i2d_bio(CHECKED_I2D_OF(type, i2d), \
(ASN1_i2d_bio(CHECKED_I2D_OF(const type, i2d), \