[thirdparty/openssl.git] / crypto / param_build.c

/*
 * Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright (c) 2019, Oracle and/or its affiliates.  All rights reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <string.h>
#include <openssl/err.h>
#include <openssl/cryptoerr.h>
#include <openssl/params.h>
#include <openssl/types.h>
#include <openssl/safestack.h>
#include "internal/cryptlib.h"
#include "openssl/param_build.h"

/*
 * Special internal param type to indicate the end of an allocate OSSL_PARAM
 * array.
 */
#define OSSL_PARAM_ALLOCATED_END    127

typedef struct {
    const char *key;
    int type;
    int secure;
    size_t size;
    size_t alloc_blocks;
    const BIGNUM *bn;
    const void *string;
    union {
        /*
         * These fields are never directly addressed, but their sizes are
         * imporant so that all native types can be copied here without overrun.
         */
        ossl_intmax_t i;
        ossl_uintmax_t u;
        double d;
    } num;
} OSSL_PARAM_BLD_DEF;

DEFINE_STACK_OF(OSSL_PARAM_BLD_DEF)

struct ossl_param_bld_st {
    size_t total_blocks;
    size_t secure_blocks;
    STACK_OF(OSSL_PARAM_BLD_DEF) *params;
};

typedef union {
    OSSL_UNION_ALIGN;
} OSSL_PARAM_BLD_BLOCK;

#define ALIGN_SIZE  sizeof(OSSL_PARAM_BLD_BLOCK)

static size_t bytes_to_blocks(size_t bytes)
{
    return (bytes + ALIGN_SIZE - 1) / ALIGN_SIZE;
}

static OSSL_PARAM_BLD_DEF *param_push(OSSL_PARAM_BLD *bld, const char *key,
                                      int size, size_t alloc, int type,
                                      int secure)
{
    OSSL_PARAM_BLD_DEF *pd = OPENSSL_zalloc(sizeof(*pd));

    if (pd == NULL) {
        CRYPTOerr(CRYPTO_F_PARAM_PUSH, ERR_R_MALLOC_FAILURE);
        return NULL;
    }
    pd->key = key;
    pd->type = type;
    pd->size = size;
    pd->alloc_blocks = bytes_to_blocks(size);
    if ((pd->secure = secure) != 0)
        bld->secure_blocks += pd->alloc_blocks;
    else
        bld->total_blocks += pd->alloc_blocks;
    if (sk_OSSL_PARAM_BLD_DEF_push(bld->params, pd) <= 0) {
        OPENSSL_free(pd);
        pd = NULL;
    }
    return pd;
}

static int param_push_num(OSSL_PARAM_BLD *bld, const char *key,
                          void *num, size_t size, int type)
{
    OSSL_PARAM_BLD_DEF *pd = param_push(bld, key, size, size, type, 0);

    if (pd == NULL)
        return 0;
    if (size > sizeof(pd->num)) {
        CRYPTOerr(CRYPTO_F_PARAM_PUSH_NUM, CRYPTO_R_TOO_MANY_BYTES);
        return 0;
    }
    memcpy(&pd->num, num, size);
    return 1;
}

OSSL_PARAM_BLD *OSSL_PARAM_BLD_new(void)
{
    OSSL_PARAM_BLD *r = OPENSSL_zalloc(sizeof(OSSL_PARAM_BLD));

    if (r != NULL) {
        r->params = sk_OSSL_PARAM_BLD_DEF_new_null();
        if (r->params == NULL) {
            OPENSSL_free(r);
            r = NULL;
        }
    }
    return r;
}

static void free_all_params(OSSL_PARAM_BLD *bld)
{
    int i, n = sk_OSSL_PARAM_BLD_DEF_num(bld->params);

    for (i = 0; i < n; i++)
        OPENSSL_free(sk_OSSL_PARAM_BLD_DEF_pop(bld->params));
}

void OSSL_PARAM_BLD_free(OSSL_PARAM_BLD *bld)
{
    free_all_params(bld);
    sk_OSSL_PARAM_BLD_DEF_free(bld->params);
    OPENSSL_free(bld);
}

int OSSL_PARAM_BLD_push_int(OSSL_PARAM_BLD *bld, const char *key, int num)
{
    return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
}

int OSSL_PARAM_BLD_push_uint(OSSL_PARAM_BLD *bld, const char *key,
                             unsigned int num)
{
    return param_push_num(bld, key, &num, sizeof(num),
                          OSSL_PARAM_UNSIGNED_INTEGER);
}

int OSSL_PARAM_BLD_push_long(OSSL_PARAM_BLD *bld, const char *key,
                             long int num)
{
    return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
}

int OSSL_PARAM_BLD_push_ulong(OSSL_PARAM_BLD *bld, const char *key,
                              unsigned long int num)
{
    return param_push_num(bld, key, &num, sizeof(num),
                          OSSL_PARAM_UNSIGNED_INTEGER);
}

int OSSL_PARAM_BLD_push_int32(OSSL_PARAM_BLD *bld, const char *key,
                              int32_t num)
{
    return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
}

int OSSL_PARAM_BLD_push_uint32(OSSL_PARAM_BLD *bld, const char *key,
                               uint32_t num)
{
    return param_push_num(bld, key, &num, sizeof(num),
                          OSSL_PARAM_UNSIGNED_INTEGER);
}

int OSSL_PARAM_BLD_push_int64(OSSL_PARAM_BLD *bld, const char *key,
                              int64_t num)
{
    return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
}

int OSSL_PARAM_BLD_push_uint64(OSSL_PARAM_BLD *bld, const char *key,
                               uint64_t num)
{
    return param_push_num(bld, key, &num, sizeof(num),
                          OSSL_PARAM_UNSIGNED_INTEGER);
}

int OSSL_PARAM_BLD_push_size_t(OSSL_PARAM_BLD *bld, const char *key,
                               size_t num)
{
    return param_push_num(bld, key, &num, sizeof(num),
                          OSSL_PARAM_UNSIGNED_INTEGER);
}

int OSSL_PARAM_BLD_push_double(OSSL_PARAM_BLD *bld, const char *key,
                               double num)
{
    return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_REAL);
}

int OSSL_PARAM_BLD_push_BN(OSSL_PARAM_BLD *bld, const char *key,
                           const BIGNUM *bn)
{
    return OSSL_PARAM_BLD_push_BN_pad(bld, key, bn,
                                      bn == NULL ? 0 : BN_num_bytes(bn));
}

int OSSL_PARAM_BLD_push_BN_pad(OSSL_PARAM_BLD *bld, const char *key,
                               const BIGNUM *bn, size_t sz)
{
    int n, secure = 0;
    OSSL_PARAM_BLD_DEF *pd;

    if (bn != NULL) {
        n = BN_num_bytes(bn);
        if (n < 0) {
            CRYPTOerr(0, CRYPTO_R_ZERO_LENGTH_NUMBER);
            return 0;
        }
        if (sz < (size_t)n) {
            CRYPTOerr(0, CRYPTO_R_TOO_SMALL_BUFFER);
            return 0;
        }
        if (BN_get_flags(bn, BN_FLG_SECURE) == BN_FLG_SECURE)
            secure = 1;
    }
    pd = param_push(bld, key, sz, sz, OSSL_PARAM_UNSIGNED_INTEGER, secure);
    if (pd == NULL)
        return 0;
    pd->bn = bn;
    return 1;
}

int OSSL_PARAM_BLD_push_utf8_string(OSSL_PARAM_BLD *bld, const char *key,
                                    const char *buf, size_t bsize)
{
    OSSL_PARAM_BLD_DEF *pd;

    if (bsize == 0) {
        bsize = strlen(buf) + 1;
    } else if (bsize > INT_MAX) {
        CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_UTF8_STRING,
                  CRYPTO_R_STRING_TOO_LONG);
        return 0;
    }
    pd = param_push(bld, key, bsize, bsize, OSSL_PARAM_UTF8_STRING, 0);
    if (pd == NULL)
        return 0;
    pd->string = buf;
    return 1;
}

int OSSL_PARAM_BLD_push_utf8_ptr(OSSL_PARAM_BLD *bld, const char *key,
                                 char *buf, size_t bsize)
{
    OSSL_PARAM_BLD_DEF *pd;

    if (bsize == 0) {
        bsize = strlen(buf) + 1;
    } else if (bsize > INT_MAX) {
        CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_UTF8_PTR,
                  CRYPTO_R_STRING_TOO_LONG);
        return 0;
    }
    pd = param_push(bld, key, bsize, sizeof(buf), OSSL_PARAM_UTF8_PTR, 0);
    if (pd == NULL)
        return 0;
    pd->string = buf;
    return 1;
}

int OSSL_PARAM_BLD_push_octet_string(OSSL_PARAM_BLD *bld, const char *key,
                                     const void *buf, size_t bsize)
{
    OSSL_PARAM_BLD_DEF *pd;

    if (bsize > INT_MAX) {
        CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_OCTET_STRING,
                  CRYPTO_R_STRING_TOO_LONG);
        return 0;
    }
    pd = param_push(bld, key, bsize, bsize, OSSL_PARAM_OCTET_STRING, 0);
    if (pd == NULL)
        return 0;
    pd->string = buf;
    return 1;
}

int OSSL_PARAM_BLD_push_octet_ptr(OSSL_PARAM_BLD *bld, const char *key,
                                  void *buf, size_t bsize)
{
    OSSL_PARAM_BLD_DEF *pd;

    if (bsize > INT_MAX) {
        CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_OCTET_PTR,
                  CRYPTO_R_STRING_TOO_LONG);
        return 0;
    }
    pd = param_push(bld, key, bsize, sizeof(buf), OSSL_PARAM_OCTET_PTR, 0);
    if (pd == NULL)
        return 0;
    pd->string = buf;
    return 1;
}

static OSSL_PARAM *param_bld_convert(OSSL_PARAM_BLD *bld, OSSL_PARAM *param,
                                     OSSL_PARAM_BLD_BLOCK *blk,
                                     OSSL_PARAM_BLD_BLOCK *secure)
{
    int i, num = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
    OSSL_PARAM_BLD_DEF *pd;
    void *p;

    for (i = 0; i < num; i++) {
        pd = sk_OSSL_PARAM_BLD_DEF_value(bld->params, i);
        param[i].key = pd->key;
        param[i].data_type = pd->type;
        param[i].data_size = pd->size;
        param[i].return_size = OSSL_PARAM_UNMODIFIED;

        if (pd->secure) {
            p = secure;
            secure += pd->alloc_blocks;
        } else {
            p = blk;
            blk += pd->alloc_blocks;
        }
        param[i].data = p;
        if (pd->bn != NULL) {
            /* BIGNUM */
            BN_bn2nativepad(pd->bn, (unsigned char *)p, pd->size);
        } else if (pd->type == OSSL_PARAM_OCTET_PTR
                   || pd->type == OSSL_PARAM_UTF8_PTR) {
            /* PTR */
            *(const void **)p = pd->string;
        } else if (pd->type == OSSL_PARAM_OCTET_STRING
                   || pd->type == OSSL_PARAM_UTF8_STRING) {
            if (pd->string != NULL)
                memcpy(p, pd->string, pd->size);
            else
                memset(p, 0, pd->size);
        } else {
            /* Number, but could also be a NULL BIGNUM */
            if (pd->size > sizeof(pd->num))
                memset(p, 0, pd->size);
            else if (pd->size > 0)
                memcpy(p, &pd->num, pd->size);
        }
    }
    param[i] = OSSL_PARAM_construct_end();
    return param + i;
}

OSSL_PARAM *OSSL_PARAM_BLD_to_param(OSSL_PARAM_BLD *bld)
{
    OSSL_PARAM_BLD_BLOCK *blk, *s = NULL;
    OSSL_PARAM *params, *last;
    const int num = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
    const size_t p_blks = bytes_to_blocks((1 + num) * sizeof(*params));
    const size_t total = ALIGN_SIZE * (p_blks + bld->total_blocks);
    const size_t ss = ALIGN_SIZE * bld->secure_blocks;

    if (ss > 0) {
        s = OPENSSL_secure_malloc(ss);
        if (s == NULL) {
            CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_TO_PARAM,
                      CRYPTO_R_SECURE_MALLOC_FAILURE);
            return NULL;
        }
    }
    params = OPENSSL_malloc(total);
    if (params == NULL) {
        CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_TO_PARAM, ERR_R_MALLOC_FAILURE);
        OPENSSL_secure_free(s);
        return NULL;
    }
    blk = p_blks + (OSSL_PARAM_BLD_BLOCK *)(params);
    last = param_bld_convert(bld, params, blk, s);
    last->data_size = ss;
    last->data = s;
    last->data_type = OSSL_PARAM_ALLOCATED_END;

    /* Reset builder for reuse */
    bld->total_blocks = 0;
    bld->secure_blocks = 0;
    free_all_params(bld);
    return params;
}

void OSSL_PARAM_BLD_free_params(OSSL_PARAM *params)
{
    if (params != NULL) {
        OSSL_PARAM *p;

        for (p = params; p->key != NULL; p++)
            ;
        if (p->data_type == OSSL_PARAM_ALLOCATED_END)
            OPENSSL_secure_clear_free(p->data, p->data_size);
        OPENSSL_free(params);
    }
}
Commit	Line	Data
	1	/*
	2	* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
	3	* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
	4	*
	5	* Licensed under the Apache License 2.0 (the "License"). You may not use
	6	* this file except in compliance with the License. You can obtain a copy
	7	* in the file LICENSE in the source distribution or at
	8	* https://www.openssl.org/source/license.html
	9	*/
	10
	11	#include <string.h>
	12	#include <openssl/err.h>
	13	#include <openssl/cryptoerr.h>
	14	#include <openssl/params.h>
	15	#include <openssl/types.h>
	16	#include <openssl/safestack.h>
	17	#include "internal/cryptlib.h"
	18	#include "openssl/param_build.h"
	19
	20	/*
	21	* Special internal param type to indicate the end of an allocate OSSL_PARAM
	22	* array.
	23	*/
	24	#define OSSL_PARAM_ALLOCATED_END 127
	25
	26	typedef struct {
	27	const char *key;
	28	int type;
	29	int secure;
	30	size_t size;
	31	size_t alloc_blocks;
	32	const BIGNUM *bn;
	33	const void *string;
	34	union {
	35	/*
	36	* These fields are never directly addressed, but their sizes are
	37	* imporant so that all native types can be copied here without overrun.
	38	*/
	39	ossl_intmax_t i;
	40	ossl_uintmax_t u;
	41	double d;
	42	} num;
	43	} OSSL_PARAM_BLD_DEF;
	44
	45	DEFINE_STACK_OF(OSSL_PARAM_BLD_DEF)
	46
	47	struct ossl_param_bld_st {
	48	size_t total_blocks;
	49	size_t secure_blocks;
	50	STACK_OF(OSSL_PARAM_BLD_DEF) *params;
	51	};
	52
	53	typedef union {
	54	OSSL_UNION_ALIGN;
	55	} OSSL_PARAM_BLD_BLOCK;
	56
	57	#define ALIGN_SIZE sizeof(OSSL_PARAM_BLD_BLOCK)
	58
	59	static size_t bytes_to_blocks(size_t bytes)
	60	{
	61	return (bytes + ALIGN_SIZE - 1) / ALIGN_SIZE;
	62	}
	63
	64	static OSSL_PARAM_BLD_DEF param_push(OSSL_PARAM_BLD bld, const char *key,
	65	int size, size_t alloc, int type,
	66	int secure)
	67	{
	68	OSSL_PARAM_BLD_DEF pd = OPENSSL_zalloc(sizeof(pd));
	69
	70	if (pd == NULL) {
	71	CRYPTOerr(CRYPTO_F_PARAM_PUSH, ERR_R_MALLOC_FAILURE);
	72	return NULL;
	73	}
	74	pd->key = key;
	75	pd->type = type;
	76	pd->size = size;
	77	pd->alloc_blocks = bytes_to_blocks(size);
	78	if ((pd->secure = secure) != 0)
	79	bld->secure_blocks += pd->alloc_blocks;
	80	else
	81	bld->total_blocks += pd->alloc_blocks;
	82	if (sk_OSSL_PARAM_BLD_DEF_push(bld->params, pd) <= 0) {
	83	OPENSSL_free(pd);
	84	pd = NULL;
	85	}
	86	return pd;
	87	}
	88
	89	static int param_push_num(OSSL_PARAM_BLD bld, const char key,
	90	void *num, size_t size, int type)
	91	{
	92	OSSL_PARAM_BLD_DEF *pd = param_push(bld, key, size, size, type, 0);
	93
	94	if (pd == NULL)
	95	return 0;
	96	if (size > sizeof(pd->num)) {
	97	CRYPTOerr(CRYPTO_F_PARAM_PUSH_NUM, CRYPTO_R_TOO_MANY_BYTES);
	98	return 0;
	99	}
	100	memcpy(&pd->num, num, size);
	101	return 1;
	102	}
	103
	104	OSSL_PARAM_BLD *OSSL_PARAM_BLD_new(void)
	105	{
	106	OSSL_PARAM_BLD *r = OPENSSL_zalloc(sizeof(OSSL_PARAM_BLD));
	107
	108	if (r != NULL) {
	109	r->params = sk_OSSL_PARAM_BLD_DEF_new_null();
	110	if (r->params == NULL) {
	111	OPENSSL_free(r);
	112	r = NULL;
	113	}
	114	}
	115	return r;
	116	}
	117
	118	static void free_all_params(OSSL_PARAM_BLD *bld)
	119	{
	120	int i, n = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
	121
	122	for (i = 0; i < n; i++)
	123	OPENSSL_free(sk_OSSL_PARAM_BLD_DEF_pop(bld->params));
	124	}
	125
	126	void OSSL_PARAM_BLD_free(OSSL_PARAM_BLD *bld)
	127	{
	128	free_all_params(bld);
	129	sk_OSSL_PARAM_BLD_DEF_free(bld->params);
	130	OPENSSL_free(bld);
	131	}
	132
	133	int OSSL_PARAM_BLD_push_int(OSSL_PARAM_BLD bld, const char key, int num)
	134	{
	135	return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
	136	}
	137
	138	int OSSL_PARAM_BLD_push_uint(OSSL_PARAM_BLD bld, const char key,
	139	unsigned int num)
	140	{
	141	return param_push_num(bld, key, &num, sizeof(num),
	142	OSSL_PARAM_UNSIGNED_INTEGER);
	143	}
	144
	145	int OSSL_PARAM_BLD_push_long(OSSL_PARAM_BLD bld, const char key,
	146	long int num)
	147	{
	148	return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
	149	}
	150
	151	int OSSL_PARAM_BLD_push_ulong(OSSL_PARAM_BLD bld, const char key,
	152	unsigned long int num)
	153	{
	154	return param_push_num(bld, key, &num, sizeof(num),
	155	OSSL_PARAM_UNSIGNED_INTEGER);
	156	}
	157
	158	int OSSL_PARAM_BLD_push_int32(OSSL_PARAM_BLD bld, const char key,
	159	int32_t num)
	160	{
	161	return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
	162	}
	163
	164	int OSSL_PARAM_BLD_push_uint32(OSSL_PARAM_BLD bld, const char key,
	165	uint32_t num)
	166	{
	167	return param_push_num(bld, key, &num, sizeof(num),
	168	OSSL_PARAM_UNSIGNED_INTEGER);
	169	}
	170
	171	int OSSL_PARAM_BLD_push_int64(OSSL_PARAM_BLD bld, const char key,
	172	int64_t num)
	173	{
	174	return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_INTEGER);
	175	}
	176
	177	int OSSL_PARAM_BLD_push_uint64(OSSL_PARAM_BLD bld, const char key,
	178	uint64_t num)
	179	{
	180	return param_push_num(bld, key, &num, sizeof(num),
	181	OSSL_PARAM_UNSIGNED_INTEGER);
	182	}
	183
	184	int OSSL_PARAM_BLD_push_size_t(OSSL_PARAM_BLD bld, const char key,
	185	size_t num)
	186	{
	187	return param_push_num(bld, key, &num, sizeof(num),
	188	OSSL_PARAM_UNSIGNED_INTEGER);
	189	}
	190
	191	int OSSL_PARAM_BLD_push_double(OSSL_PARAM_BLD bld, const char key,
	192	double num)
	193	{
	194	return param_push_num(bld, key, &num, sizeof(num), OSSL_PARAM_REAL);
	195	}
	196
	197	int OSSL_PARAM_BLD_push_BN(OSSL_PARAM_BLD bld, const char key,
	198	const BIGNUM *bn)
	199	{
	200	return OSSL_PARAM_BLD_push_BN_pad(bld, key, bn,
	201	bn == NULL ? 0 : BN_num_bytes(bn));
	202	}
	203
	204	int OSSL_PARAM_BLD_push_BN_pad(OSSL_PARAM_BLD bld, const char key,
	205	const BIGNUM *bn, size_t sz)
	206	{
	207	int n, secure = 0;
	208	OSSL_PARAM_BLD_DEF *pd;
	209
	210	if (bn != NULL) {
	211	n = BN_num_bytes(bn);
	212	if (n < 0) {
	213	CRYPTOerr(0, CRYPTO_R_ZERO_LENGTH_NUMBER);
	214	return 0;
	215	}
	216	if (sz < (size_t)n) {
	217	CRYPTOerr(0, CRYPTO_R_TOO_SMALL_BUFFER);
	218	return 0;
	219	}
	220	if (BN_get_flags(bn, BN_FLG_SECURE) == BN_FLG_SECURE)
	221	secure = 1;
	222	}
	223	pd = param_push(bld, key, sz, sz, OSSL_PARAM_UNSIGNED_INTEGER, secure);
	224	if (pd == NULL)
	225	return 0;
	226	pd->bn = bn;
	227	return 1;
	228	}
	229
	230	int OSSL_PARAM_BLD_push_utf8_string(OSSL_PARAM_BLD bld, const char key,
	231	const char *buf, size_t bsize)
	232	{
	233	OSSL_PARAM_BLD_DEF *pd;
	234
	235	if (bsize == 0) {
	236	bsize = strlen(buf) + 1;
	237	} else if (bsize > INT_MAX) {
	238	CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_UTF8_STRING,
	239	CRYPTO_R_STRING_TOO_LONG);
	240	return 0;
	241	}
	242	pd = param_push(bld, key, bsize, bsize, OSSL_PARAM_UTF8_STRING, 0);
	243	if (pd == NULL)
	244	return 0;
	245	pd->string = buf;
	246	return 1;
	247	}
	248
	249	int OSSL_PARAM_BLD_push_utf8_ptr(OSSL_PARAM_BLD bld, const char key,
	250	char *buf, size_t bsize)
	251	{
	252	OSSL_PARAM_BLD_DEF *pd;
	253
	254	if (bsize == 0) {
	255	bsize = strlen(buf) + 1;
	256	} else if (bsize > INT_MAX) {
	257	CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_UTF8_PTR,
	258	CRYPTO_R_STRING_TOO_LONG);
	259	return 0;
	260	}
	261	pd = param_push(bld, key, bsize, sizeof(buf), OSSL_PARAM_UTF8_PTR, 0);
	262	if (pd == NULL)
	263	return 0;
	264	pd->string = buf;
	265	return 1;
	266	}
	267
	268	int OSSL_PARAM_BLD_push_octet_string(OSSL_PARAM_BLD bld, const char key,
	269	const void *buf, size_t bsize)
	270	{
	271	OSSL_PARAM_BLD_DEF *pd;
	272
	273	if (bsize > INT_MAX) {
	274	CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_OCTET_STRING,
	275	CRYPTO_R_STRING_TOO_LONG);
	276	return 0;
	277	}
	278	pd = param_push(bld, key, bsize, bsize, OSSL_PARAM_OCTET_STRING, 0);
	279	if (pd == NULL)
	280	return 0;
	281	pd->string = buf;
	282	return 1;
	283	}
	284
	285	int OSSL_PARAM_BLD_push_octet_ptr(OSSL_PARAM_BLD bld, const char key,
	286	void *buf, size_t bsize)
	287	{
	288	OSSL_PARAM_BLD_DEF *pd;
	289
	290	if (bsize > INT_MAX) {
	291	CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_PUSH_OCTET_PTR,
	292	CRYPTO_R_STRING_TOO_LONG);
	293	return 0;
	294	}
	295	pd = param_push(bld, key, bsize, sizeof(buf), OSSL_PARAM_OCTET_PTR, 0);
	296	if (pd == NULL)
	297	return 0;
	298	pd->string = buf;
	299	return 1;
	300	}
	301
	302	static OSSL_PARAM param_bld_convert(OSSL_PARAM_BLD bld, OSSL_PARAM *param,
	303	OSSL_PARAM_BLD_BLOCK *blk,
	304	OSSL_PARAM_BLD_BLOCK *secure)
	305	{
	306	int i, num = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
	307	OSSL_PARAM_BLD_DEF *pd;
	308	void *p;
	309
	310	for (i = 0; i < num; i++) {
	311	pd = sk_OSSL_PARAM_BLD_DEF_value(bld->params, i);
	312	param[i].key = pd->key;
	313	param[i].data_type = pd->type;
	314	param[i].data_size = pd->size;
	315	param[i].return_size = OSSL_PARAM_UNMODIFIED;
	316
	317	if (pd->secure) {
	318	p = secure;
	319	secure += pd->alloc_blocks;
	320	} else {
	321	p = blk;
	322	blk += pd->alloc_blocks;
	323	}
	324	param[i].data = p;
	325	if (pd->bn != NULL) {
	326	/* BIGNUM */
	327	BN_bn2nativepad(pd->bn, (unsigned char *)p, pd->size);
	328	} else if (pd->type == OSSL_PARAM_OCTET_PTR
	329	\|\| pd->type == OSSL_PARAM_UTF8_PTR) {
	330	/* PTR */
	331	(const void *)p = pd->string;
	332	} else if (pd->type == OSSL_PARAM_OCTET_STRING
	333	\|\| pd->type == OSSL_PARAM_UTF8_STRING) {
	334	if (pd->string != NULL)
	335	memcpy(p, pd->string, pd->size);
	336	else
	337	memset(p, 0, pd->size);
	338	} else {
	339	/* Number, but could also be a NULL BIGNUM */
	340	if (pd->size > sizeof(pd->num))
	341	memset(p, 0, pd->size);
	342	else if (pd->size > 0)
	343	memcpy(p, &pd->num, pd->size);
	344	}
	345	}
	346	param[i] = OSSL_PARAM_construct_end();
	347	return param + i;
	348	}
	349
	350	OSSL_PARAM OSSL_PARAM_BLD_to_param(OSSL_PARAM_BLD bld)
	351	{
	352	OSSL_PARAM_BLD_BLOCK blk, s = NULL;
	353	OSSL_PARAM params, last;
	354	const int num = sk_OSSL_PARAM_BLD_DEF_num(bld->params);
	355	const size_t p_blks = bytes_to_blocks((1 + num) * sizeof(*params));
	356	const size_t total = ALIGN_SIZE * (p_blks + bld->total_blocks);
	357	const size_t ss = ALIGN_SIZE * bld->secure_blocks;
	358
	359	if (ss > 0) {
	360	s = OPENSSL_secure_malloc(ss);
	361	if (s == NULL) {
	362	CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_TO_PARAM,
	363	CRYPTO_R_SECURE_MALLOC_FAILURE);
	364	return NULL;
	365	}
	366	}
	367	params = OPENSSL_malloc(total);
	368	if (params == NULL) {
	369	CRYPTOerr(CRYPTO_F_OSSL_PARAM_BLD_TO_PARAM, ERR_R_MALLOC_FAILURE);
	370	OPENSSL_secure_free(s);
	371	return NULL;
	372	}
	373	blk = p_blks + (OSSL_PARAM_BLD_BLOCK *)(params);
	374	last = param_bld_convert(bld, params, blk, s);
	375	last->data_size = ss;
	376	last->data = s;
	377	last->data_type = OSSL_PARAM_ALLOCATED_END;
	378
	379	/* Reset builder for reuse */
	380	bld->total_blocks = 0;
	381	bld->secure_blocks = 0;
	382	free_all_params(bld);
	383	return params;
	384	}
	385
	386	void OSSL_PARAM_BLD_free_params(OSSL_PARAM *params)
	387	{
	388	if (params != NULL) {
	389	OSSL_PARAM *p;
	390
	391	for (p = params; p->key != NULL; p++)
	392	;
	393	if (p->data_type == OSSL_PARAM_ALLOCATED_END)
	394	OPENSSL_secure_clear_free(p->data, p->data_size);
	395	OPENSSL_free(params);
	396	}
	397	}