/* $OpenBSD: asn1_locl.h,v 1.39 2022/09/11 17:22:52 tb Exp $ */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2006.
 */
/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include "bytestring.h"

__BEGIN_HIDDEN_DECLS

/* Internal ASN1 structures and functions: not for application use */

ASN1_TYPE *ASN1_TYPE_pack_sequence(const ASN1_ITEM *it, void *s, ASN1_TYPE **t);
void *ASN1_TYPE_unpack_sequence(const ASN1_ITEM *it, const ASN1_TYPE *t);

/* These are used internally in the ASN1_OBJECT to keep track of
 * whether the names and data need to be free()ed */
#define ASN1_OBJECT_FLAG_DYNAMIC         0x01   /* internal use */
#define ASN1_OBJECT_FLAG_CRITICAL        0x02   /* critical x509v3 object id */
#define ASN1_OBJECT_FLAG_DYNAMIC_STRINGS 0x04   /* internal use */
#define ASN1_OBJECT_FLAG_DYNAMIC_DATA    0x08   /* internal use */
struct asn1_object_st {
        const char *sn, *ln;
        int nid;
        int length;
        const unsigned char *data;      /* data remains const after init */
        int flags;      /* Should we free this one */
} /* ASN1_OBJECT */;

/* ASN1 print context structure */

struct asn1_pctx_st {
        unsigned long flags;
        unsigned long nm_flags;
        unsigned long cert_flags;
        unsigned long oid_flags;
        unsigned long str_flags;
} /* ASN1_PCTX */;

/* ASN1 public key method structure */

struct evp_pkey_asn1_method_st {
        int pkey_id;
        int pkey_base_id;
        unsigned long pkey_flags;

        char *pem_str;
        char *info;

        int (*pub_decode)(EVP_PKEY *pk, X509_PUBKEY *pub);
        int (*pub_encode)(X509_PUBKEY *pub, const EVP_PKEY *pk);
        int (*pub_cmp)(const EVP_PKEY *a, const EVP_PKEY *b);
        int (*pub_print)(BIO *out, const EVP_PKEY *pkey, int indent,
            ASN1_PCTX *pctx);

        int (*priv_decode)(EVP_PKEY *pk, const PKCS8_PRIV_KEY_INFO *p8inf);
        int (*priv_encode)(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pk);
        int (*priv_print)(BIO *out, const EVP_PKEY *pkey, int indent,
            ASN1_PCTX *pctx);

        int (*pkey_size)(const EVP_PKEY *pk);
        int (*pkey_bits)(const EVP_PKEY *pk);
        int (*pkey_security_bits)(const EVP_PKEY *pk);

        int (*param_decode)(EVP_PKEY *pkey, const unsigned char **pder,
            int derlen);
        int (*param_encode)(const EVP_PKEY *pkey, unsigned char **pder);
        int (*param_missing)(const EVP_PKEY *pk);
        int (*param_copy)(EVP_PKEY *to, const EVP_PKEY *from);
        int (*param_cmp)(const EVP_PKEY *a, const EVP_PKEY *b);
        int (*param_print)(BIO *out, const EVP_PKEY *pkey, int indent,
            ASN1_PCTX *pctx);
        int (*sig_print)(BIO *out, const X509_ALGOR *sigalg,
            const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx);

        void (*pkey_free)(EVP_PKEY *pkey);
        int (*pkey_ctrl)(EVP_PKEY *pkey, int op, long arg1, void *arg2);

        /* Legacy functions for old PEM */

        int (*old_priv_decode)(EVP_PKEY *pkey, const unsigned char **pder,
            int derlen);
        int (*old_priv_encode)(const EVP_PKEY *pkey, unsigned char **pder);
        /* Custom ASN1 signature verification */
        int (*item_verify)(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
            X509_ALGOR *a, ASN1_BIT_STRING *sig, EVP_PKEY *pkey);
        int (*item_sign)(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
            X509_ALGOR *alg1, X509_ALGOR *alg2, ASN1_BIT_STRING *sig);

        int (*pkey_check)(const EVP_PKEY *pk);
        int (*pkey_public_check)(const EVP_PKEY *pk);
        int (*pkey_param_check)(const EVP_PKEY *pk);
} /* EVP_PKEY_ASN1_METHOD */;

/* Method to handle CRL access.
 * In general a CRL could be very large (several Mb) and can consume large
 * amounts of resources if stored in memory by multiple processes.
 * This method allows general CRL operations to be redirected to more
 * efficient callbacks: for example a CRL entry database.
 */

#define X509_CRL_METHOD_DYNAMIC         1

struct x509_crl_method_st {
        int flags;
        int (*crl_init)(X509_CRL *crl);
        int (*crl_free)(X509_CRL *crl);
        int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret,
            ASN1_INTEGER *ser, X509_NAME *issuer);
        int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk);
};

int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it);
int asn1_set_choice_selector(ASN1_VALUE **pval, int value, const ASN1_ITEM *it);

ASN1_VALUE ** asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt);

const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt, int nullerr);

int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it);

void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it);
void asn1_enc_cleanup(ASN1_VALUE **pval, const ASN1_ITEM *it);
int asn1_enc_save(ASN1_VALUE **pval, CBS *cbs, const ASN1_ITEM *it);
int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval, const ASN1_ITEM *it);

int i2d_ASN1_BOOLEAN(int a, unsigned char **pp);
int d2i_ASN1_BOOLEAN(int *a, const unsigned char **pp, long length);

/*
 * Unicode codepoint constants
 */
#define UNICODE_MAX             0x10FFFF
#define UNICODE_SURROGATE_MIN   0x00D800
#define UNICODE_SURROGATE_MAX   0x00DFFF

#define UNICODE_IS_SURROGATE(x) \
        ((x) >= UNICODE_SURROGATE_MIN && (x) <= UNICODE_SURROGATE_MAX)

int UTF8_getc(const unsigned char *str, int len, unsigned long *val);
int UTF8_putc(unsigned char *str, int len, unsigned long value);

int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb);

int asn1_get_identifier_cbs(CBS *cbs, int der_mode, uint8_t *out_class,
    int *out_constructed, uint32_t *out_tag_number);
int asn1_get_length_cbs(CBS *cbs, int der_mode, int *out_indefinite,
    size_t *out_length);
int asn1_get_object_cbs(CBS *cbs, int der_mode, uint8_t *out_class,
    int *out_constructed, uint32_t *out_tag_number, int *out_indefinite,
    size_t *out_length);
int asn1_get_primitive(CBS *cbs, int der_mode, uint32_t *out_tag_number,
    CBS *out_content);

int asn1_must_be_constructed(int tag);
int asn1_must_be_primitive(int tag);
int asn1_tag2charwidth(int tag);

int asn1_abs_set_unused_bits(ASN1_BIT_STRING *abs, uint8_t unused_bits);
int c2i_ASN1_BIT_STRING_cbs(ASN1_BIT_STRING **out_abs, CBS *cbs);

int c2i_ASN1_ENUMERATED_cbs(ASN1_ENUMERATED **out_aenum, CBS *cbs);

int asn1_aint_get_uint64(CBS *cbs, uint64_t *out_val);
int asn1_aint_set_uint64(uint64_t val, uint8_t **out_data, int *out_len);
int asn1_aint_get_int64(CBS *cbs, int negative, int64_t *out_val);
int c2i_ASN1_INTEGER_cbs(ASN1_INTEGER **out_aint, CBS *cbs);

int c2i_ASN1_OBJECT_cbs(ASN1_OBJECT **out_aobj, CBS *content);
int i2t_ASN1_OBJECT_internal(const ASN1_OBJECT *aobj, char *buf, int buf_len,
    int no_name);
ASN1_OBJECT *t2i_ASN1_OBJECT_internal(const char *oid);

int asn1_time_parse_cbs(const CBS *cbs, int is_gentime, struct tm *out_tm);

ASN1_OBJECT *c2i_ASN1_OBJECT(ASN1_OBJECT **a, const unsigned char **pp,
    long length);
int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp);
ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a,
    const unsigned char **pp, long length);
int i2c_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **pp);
ASN1_INTEGER *c2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **pp,
    long length);

__END_HIDDEN_DECLS