/src/openssl/crypto/asn1/asn1_lib.c

Source
/*
 * Copyright 1995-2025 The OpenSSL Project Authors. 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 <stdio.h>
#include <limits.h>
#include "internal/cryptlib.h"
#include <openssl/asn1.h>
#include "asn1_local.h"

static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
    long max);
static void asn1_put_length(unsigned char **pp, int length);

static int _asn1_check_infinite_end(const unsigned char **p, long len)
{
    /*
     * If there is 0 or 1 byte left, the length check should pick things up
     */
    if (len <= 0) {
        return 1;
    } else {
        if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0)) {
            (*p) += 2;
            return 1;
        }
    }
    return 0;
}

int ASN1_check_infinite_end(unsigned char **p, long len)
{
    return _asn1_check_infinite_end((const unsigned char **)p, len);
}

int ASN1_const_check_infinite_end(const unsigned char **p, long len)
{
    return _asn1_check_infinite_end(p, len);
}

int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
    int *pclass, long omax)
{
    int i, ret;
    long len;
    const unsigned char *p = *pp;
    int tag, xclass, inf;
    long max = omax;

    if (omax <= 0) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL);
        return 0x80;
    }
    ret = (*p & V_ASN1_CONSTRUCTED);
    xclass = (*p & V_ASN1_PRIVATE);
    i = *p & V_ASN1_PRIMITIVE_TAG;
    if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
        p++;
        if (--max == 0)
            goto err;
        len = 0;
        while (*p & 0x80) {
            len <<= 7L;
            len |= *(p++) & 0x7f;
            if (--max == 0)
                goto err;
            if (len > (INT_MAX >> 7L))
                goto err;
        }
        len <<= 7L;
        len |= *(p++) & 0x7f;
        tag = (int)len;
        if (--max == 0)
            goto err;
    } else {
        tag = i;
        p++;
        if (--max == 0)
            goto err;
    }
    *ptag = tag;
    *pclass = xclass;
    if (!asn1_get_length(&p, &inf, plength, max))
        goto err;

    if (inf && !(ret & V_ASN1_CONSTRUCTED))
        goto err;

    if (*plength > (omax - (p - *pp))) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
        /*
         * Set this so that even if things are not long enough the values are
         * set correctly
         */
        ret |= 0x80;
    }
    *pp = p;
    return ret | inf;
err:
    ERR_raise(ERR_LIB_ASN1, ASN1_R_HEADER_TOO_LONG);
    return 0x80;
}

/*
 * Decode a length field.
 * The short form is a single byte defining a length 0 - 127.
 * The long form is a byte 0 - 127 with the top bit set and this indicates
 * the number of following octets that contain the length.  These octets
 * are stored most significant digit first.
 */
static int asn1_get_length(const unsigned char **pp, int *inf, long *rl,
    long max)
{
    const unsigned char *p = *pp;
    unsigned long ret = 0;
    int i;

    if (max-- < 1)
        return 0;
    if (*p == 0x80) {
        *inf = 1;
        p++;
    } else {
        *inf = 0;
        i = *p & 0x7f;
        if (*p++ & 0x80) {
            if (max < i)
                return 0;
            /* Skip leading zeroes */
            while (i > 0 && *p == 0) {
                p++;
                i--;
            }
            if (i > (int)sizeof(long))
                return 0;
            while (i > 0) {
                ret <<= 8;
                ret |= *p++;
                i--;
            }
            if (ret > LONG_MAX)
                return 0;
        } else {
            ret = i;
        }
    }
    *pp = p;
    *rl = (long)ret;
    return 1;
}

/*
 * constructed == 2 for indefinite length constructed
 */
void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
    int xclass)
{
    unsigned char *p = *pp;
    int i, ttag;

    i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
    i |= (xclass & V_ASN1_PRIVATE);
    if (tag < 31) {
        *(p++) = i | (tag & V_ASN1_PRIMITIVE_TAG);
    } else {
        *(p++) = i | V_ASN1_PRIMITIVE_TAG;
        for (i = 0, ttag = tag; ttag > 0; i++)
            ttag >>= 7;
        ttag = i;
        while (i-- > 0) {
            p[i] = tag & 0x7f;
            if (i != (ttag - 1))
                p[i] |= 0x80;
            tag >>= 7;
        }
        p += ttag;
    }
    if (constructed == 2)
        *(p++) = 0x80;
    else
        asn1_put_length(&p, length);
    *pp = p;
}

int ASN1_put_eoc(unsigned char **pp)
{
    unsigned char *p = *pp;

    *p++ = 0;
    *p++ = 0;
    *pp = p;
    return 2;
}

static void asn1_put_length(unsigned char **pp, int length)
{
    unsigned char *p = *pp;
    int i, len;

    if (length <= 127) {
        *(p++) = (unsigned char)length;
    } else {
        len = length;
        for (i = 0; len > 0; i++)
            len >>= 8;
        *(p++) = i | 0x80;
        len = i;
        while (i-- > 0) {
            p[i] = length & 0xff;
            length >>= 8;
        }
        p += len;
    }
    *pp = p;
}

int ASN1_object_size(int constructed, int length, int tag)
{
    int ret = 1;

    if (length < 0)
        return -1;
    if (tag >= 31) {
        while (tag > 0) {
            tag >>= 7;
            ret++;
        }
    }
    if (constructed == 2) {
        ret += 3;
    } else {
        ret++;
        if (length > 127) {
            int tmplen = length;
            while (tmplen > 0) {
                tmplen >>= 8;
                ret++;
            }
        }
    }
    if (ret >= INT_MAX - length)
        return -1;
    return ret + length;
}

void ossl_asn1_bit_string_clear_unused_bits(ASN1_STRING *str)
{
    str->flags &= ~0x07;
    str->flags &= ~ASN1_STRING_FLAG_BITS_LEFT;
}

void ossl_asn1_bit_string_set_unused_bits(ASN1_STRING *str, unsigned int num)
{
    ossl_asn1_bit_string_clear_unused_bits(str);
    str->flags |= ASN1_STRING_FLAG_BITS_LEFT | (num & 0x07);
}

int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
{
    if (str == NULL)
        return 0;
    dst->type = str->type;
    if (!ossl_asn1_string_set_internal(dst, str->data, str->length,
            /*add_nul_byte=*/0))
        return 0;
    /* Copy flags but preserve embed value */
    dst->flags &= ASN1_STRING_FLAG_EMBED;
    dst->flags |= str->flags & ~ASN1_STRING_FLAG_EMBED;
    return 1;
}

ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
{
    ASN1_STRING *ret;

    if (!str)
        return NULL;
    ret = ASN1_STRING_new();
    if (ret == NULL)
        return NULL;
    if (!ASN1_STRING_copy(ret, str)) {
        ASN1_STRING_free(ret);
        return NULL;
    }
    return ret;
}

int ossl_asn1_string_set_internal(ASN1_STRING *str, const uint8_t *data,
    int len_in, int add_nul_byte)
{
    size_t len, alloc_len;

#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
    /*
     * Force no NUL byte for callers that are requesting it
     * 0 length object data will be NULL
     */
    add_nul_byte = 0;
#endif
    if (len_in < -1) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL);
        return 0;
    }
    if (len_in == -1) {
        if (data == NULL)
            return 0;
        len = strlen((const char *)data);
    } else {
        len = (size_t)len_in;
    }
    /*
     * Add one to the length to allow for adding an a '\0' terminator
     * "even though this isn't strictly necessary".
     */
    alloc_len = add_nul_byte ? len + 1 : len;

    if (alloc_len > INT_MAX) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LARGE);
        return 0;
    }

    if ((str->flags & ASN1_STRING_FLAG_DATA_NOT_OWNED)) {
        str->data = NULL;
        str->length = 0;
        str->flags &= ~ASN1_STRING_FLAG_DATA_NOT_OWNED;
    }

    /* Ensure copying a 0 length data field is defined. */
    if (alloc_len == 0) {
        OPENSSL_free(str->data);
        str->data = NULL;
        str->length = 0;
        return 1;
    }

    if ((size_t)str->length != alloc_len) {
        uint8_t *c;
        c = OPENSSL_realloc(str->length == 0 ? NULL : str->data, alloc_len);
        if (c == NULL)
            return 0;
        str->data = c;
    }
    /* length never includes the added \0 byte */
    str->length = (int)len;

    if (data != NULL && str->data != NULL) {
        memcpy(str->data, data, len);
        if (add_nul_byte) {
            /*
             * Add a '\0' terminator. This should not be necessary - but we add it as
             * a safety precaution
             */
            str->data[len] = '\0';
        }
    }
    ossl_asn1_bit_string_clear_unused_bits(str);

    return 1;
}

#ifndef OPENSSL_NO_DEPRECATED_4_1
int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len_in)
{
    return ossl_asn1_string_set_internal(str, (const uint8_t *)_data, len_in,
        /*add_nul_byte=*/1);
}
#endif

void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
{
    if (!(str->flags & ASN1_STRING_FLAG_DATA_NOT_OWNED)) {
        OPENSSL_clear_free(str->data, str->length);
    }
    str->flags &= ~ASN1_STRING_FLAG_DATA_NOT_OWNED;
    str->data = data;
    str->length = len;
}

int ASN1_STRING_set_data(ASN1_STRING *str, const uint8_t *data, size_t len_in)
{
    if (str->type == V_ASN1_BIT_STRING) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_BITSTRING_FORMAT);
        return 0;
    }
    /* This will go away once ASN1_STRING can size_t internally */
    if (len_in > INT_MAX) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LARGE);
        return 0;
    }
    return ossl_asn1_string_set_internal(str, data, (int)len_in, /*add_nul_byte=*/0);
}

int ASN1_STRING_set_string(ASN1_STRING *str, const char *c_string)
{
    return ASN1_STRING_set_data(str, (const uint8_t *)c_string,
        strlen(c_string));
}

ASN1_STRING *ASN1_STRING_new(void)
{
    return ASN1_STRING_type_new(V_ASN1_OCTET_STRING);
}

ASN1_STRING *ASN1_STRING_type_new(int type)
{
    ASN1_STRING *ret;

    ret = OPENSSL_zalloc(sizeof(*ret));
    if (ret == NULL)
        return NULL;
    ret->type = type;
    return ret;
}

ASN1_STRING *ASN1_STRING_new_not_owned(int type, const uint8_t *data,
    size_t length)
{
    ASN1_STRING *ret;

    if (type == V_ASN1_BIT_STRING)
        return NULL;

    if (data == NULL || length == 0)
        return NULL;

    if (length > INT_MAX)
        return NULL;

    ret = OPENSSL_zalloc(sizeof(*ret));
    if (ret == NULL)
        return NULL;

    ret->type = type;
    ret->data = (unsigned char *)data;
    ret->length = (int)length;
    ret->flags |= ASN1_STRING_FLAG_DATA_NOT_OWNED;

    return ret;
}

void ossl_asn1_string_free_internal(ASN1_STRING *a, int clear, int embed)
{
    if (a == NULL)
        return;

    if ((a->flags & ASN1_STRING_FLAG_DATA_NOT_OWNED)) {
        a->data = NULL;
        a->length = 0;
        a->flags &= ~ASN1_STRING_FLAG_DATA_NOT_OWNED;
    }

    if (!(a->flags & ASN1_STRING_FLAG_NDEF)) {
        if (clear)
            OPENSSL_clear_free(a->data, a->length);
        else
            OPENSSL_free(a->data);
    }
    /*
     * TODO(beck): Add an assert here to verify that the embed arg is
     * always set to match the flag, and then get rid of the arg.
     */
    if (!embed && !(a->flags & ASN1_STRING_FLAG_EMBED)) {
        if (clear)
            OPENSSL_clear_free(a, sizeof(*a));
        else
            OPENSSL_free(a);
    }
}

void ASN1_STRING_free(ASN1_STRING *a)
{
    if (a == NULL)
        return;

    ossl_asn1_string_free_internal(a, 0, a->flags & ASN1_STRING_FLAG_EMBED);
}

void ASN1_STRING_clear_free(ASN1_STRING *a)
{
    if (a == NULL)
        return;

    ossl_asn1_string_free_internal(a, 1, a->flags & ASN1_STRING_FLAG_EMBED);
}

int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
{
    int i;

    i = (a->length - b->length);
    if (i == 0) {
        if (a->length != 0)
            i = memcmp(a->data, b->data, a->length);
        if (i == 0)
            return a->type - b->type;
        else
            return i;
    } else {
        return i;
    }
}

#ifndef OPENSSL_NO_DEPRECATED_4_1
int ASN1_STRING_length(const ASN1_STRING *x)
{
    return x->length;
}
#endif

size_t ASN1_STRING_length_ex(const ASN1_STRING *x)
{
    return (size_t)x->length;
}

#ifndef OPENSSL_NO_DEPRECATED_3_0
void ASN1_STRING_length_set(ASN1_STRING *x, int len)
{
    x->length = len;
}
#endif

int ASN1_STRING_type(const ASN1_STRING *x)
{
    return x->type;
}

const unsigned char *ASN1_STRING_get0_data(const ASN1_STRING *x)
{
    return x->data;
}

/* |max_len| excludes NUL terminator and may be 0 to indicate no restriction */
char *ossl_sk_ASN1_UTF8STRING2text(STACK_OF(ASN1_UTF8STRING) *text,
    const char *sep, size_t max_len)
{
    int i;
    ASN1_UTF8STRING *current;
    size_t length = 0, sep_len;
    char *result = NULL;
    char *p;

    if (sep == NULL)
        sep = "";
    sep_len = strlen(sep);

    for (i = 0; i < sk_ASN1_UTF8STRING_num(text); i++) {
        current = sk_ASN1_UTF8STRING_value(text, i);
        if (i > 0)
            length += sep_len;
        length += ASN1_STRING_length_ex(current);
        if (max_len != 0 && length > max_len)
            return NULL;
    }
    if ((result = OPENSSL_malloc(length + 1)) == NULL)
        return NULL;

    p = result;
    for (i = 0; i < sk_ASN1_UTF8STRING_num(text); i++) {
        current = sk_ASN1_UTF8STRING_value(text, i);
        length = ASN1_STRING_length_ex(current);
        if (i > 0 && sep_len > 0) {
            strncpy(p, sep, sep_len + 1); /* using + 1 to silence gcc warning */
            p += sep_len;
        }
        strncpy(p, (const char *)ASN1_STRING_get0_data(current), length);
        p += length;
    }
    *p = '\0';

    return result;
}

Coverage Report

Created: 2026-07-19 06:36

Line	Count	Source
1		/*
2		* Copyright 1995-2025 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the Apache License 2.0 (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		#include <stdio.h>
11		#include <limits.h>
12		#include "internal/cryptlib.h"
13		#include <openssl/asn1.h>
14		#include "asn1_local.h"
15
16		static int asn1_get_length(const unsigned char *pp, int inf, long *rl,
17		long max);
18		static void asn1_put_length(unsigned char **pp, int length);
19
20		static int _asn1_check_infinite_end(const unsigned char **p, long len)
21	0	{
22		/*
23		* If there is 0 or 1 byte left, the length check should pick things up
24		*/
25	0	if (len <= 0) {
26	0	return 1;
27	0	} else {
28	0	if ((len >= 2) && ((p)[0] == 0) && ((p)[1] == 0)) {
29	0	(*p) += 2;
30	0	return 1;
31	0	}
32	0	}
33	0	return 0;
34	0	}
35
36		int ASN1_check_infinite_end(unsigned char **p, long len)
37	0	{
38	0	return _asn1_check_infinite_end((const unsigned char **)p, len);
39	0	}
40
41		int ASN1_const_check_infinite_end(const unsigned char **p, long len)
42	0	{
43	0	return _asn1_check_infinite_end(p, len);
44	0	}
45
46		int ASN1_get_object(const unsigned char *pp, long plength, int *ptag,
47		int *pclass, long omax)
48	154k	{
49	154k	int i, ret;
50	154k	long len;
51	154k	const unsigned char p = pp;
52	154k	int tag, xclass, inf;
53	154k	long max = omax;
54
55	154k	if (omax <= 0) {
56	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL);
57	0	return 0x80;
58	0	}
59	154k	ret = (*p & V_ASN1_CONSTRUCTED);
60	154k	xclass = (*p & V_ASN1_PRIVATE);
61	154k	i = *p & V_ASN1_PRIMITIVE_TAG;
62	154k	if (i == V_ASN1_PRIMITIVE_TAG) { /* high-tag */
63	6.95k	p++;
64	6.95k	if (--max == 0)
65	427	goto err;
66	6.53k	len = 0;
67	12.2k	while (*p & 0x80) {
68	6.85k	len <<= 7L;
69	6.85k	len \|= *(p++) & 0x7f;
70	6.85k	if (--max == 0)
71	724	goto err;
72	6.13k	if (len > (INT_MAX >> 7L))
73	429	goto err;
74	6.13k	}
75	5.37k	len <<= 7L;
76	5.37k	len \|= *(p++) & 0x7f;
77	5.37k	tag = (int)len;
78	5.37k	if (--max == 0)
79	544	goto err;
80	148k	} else {
81	148k	tag = i;
82	148k	p++;
83	148k	if (--max == 0)
84	2.06k	goto err;
85	148k	}
86	150k	*ptag = tag;
87	150k	*pclass = xclass;
88	150k	if (!asn1_get_length(&p, &inf, plength, max))
89	2.66k	goto err;
90
91	148k	if (inf && !(ret & V_ASN1_CONSTRUCTED))
92	465	goto err;
93
94	147k	if (plength > (omax - (p - pp))) {
95	2.48k	ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LONG);
96		/*
97		* Set this so that even if things are not long enough the values are
98		* set correctly
99		*/
100	2.48k	ret \|= 0x80;
101	2.48k	}
102	147k	*pp = p;
103	147k	return ret \| inf;
104	7.31k	err:
105	7.31k	ERR_raise(ERR_LIB_ASN1, ASN1_R_HEADER_TOO_LONG);
106	7.31k	return 0x80;
107	148k	}
108
109		/*
110		* Decode a length field.
111		* The short form is a single byte defining a length 0 - 127.
112		* The long form is a byte 0 - 127 with the top bit set and this indicates
113		* the number of following octets that contain the length. These octets
114		* are stored most significant digit first.
115		*/
116		static int asn1_get_length(const unsigned char *pp, int inf, long *rl,
117		long max)
118	150k	{
119	150k	const unsigned char p = pp;
120	150k	unsigned long ret = 0;
121	150k	int i;
122
123	150k	if (max-- < 1)
124	0	return 0;
125	150k	if (*p == 0x80) {
126	22.1k	*inf = 1;
127	22.1k	p++;
128	128k	} else {
129	128k	*inf = 0;
130	128k	i = *p & 0x7f;
131	128k	if (*p++ & 0x80) {
132	33.0k	if (max < i)
133	847	return 0;
134		/* Skip leading zeroes */
135	39.9k	while (i > 0 && *p == 0) {
136	7.74k	p++;
137	7.74k	i--;
138	7.74k	}
139	32.2k	if (i > (int)sizeof(long))
140	749	return 0;
141	84.0k	while (i > 0) {
142	52.5k	ret <<= 8;
143	52.5k	ret \|= *p++;
144	52.5k	i--;
145	52.5k	}
146	31.4k	if (ret > LONG_MAX)
147	1.06k	return 0;
148	95.5k	} else {
149	95.5k	ret = i;
150	95.5k	}
151	128k	}
152	148k	*pp = p;
153	148k	*rl = (long)ret;
154	148k	return 1;
155	150k	}
156
157		/*
158		* constructed == 2 for indefinite length constructed
159		*/
160		void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
161		int xclass)
162	17.3k	{
163	17.3k	unsigned char p = pp;
164	17.3k	int i, ttag;
165
166	17.3k	i = (constructed) ? V_ASN1_CONSTRUCTED : 0;
167	17.3k	i \|= (xclass & V_ASN1_PRIVATE);
168	17.3k	if (tag < 31) {
169	17.3k	*(p++) = i \| (tag & V_ASN1_PRIMITIVE_TAG);
170	17.3k	} else {
171	0	*(p++) = i \| V_ASN1_PRIMITIVE_TAG;
172	0	for (i = 0, ttag = tag; ttag > 0; i++)
173	0	ttag >>= 7;
174	0	ttag = i;
175	0	while (i-- > 0) {
176	0	p[i] = tag & 0x7f;
177	0	if (i != (ttag - 1))
178	0	p[i] \|= 0x80;
179	0	tag >>= 7;
180	0	}
181	0	p += ttag;
182	0	}
183	17.3k	if (constructed == 2)
184	0	*(p++) = 0x80;
185	17.3k	else
186	17.3k	asn1_put_length(&p, length);
187	17.3k	*pp = p;
188	17.3k	}
189
190		int ASN1_put_eoc(unsigned char **pp)
191	0	{
192	0	unsigned char p = pp;
193
194	0	*p++ = 0;
195	0	*p++ = 0;
196	0	*pp = p;
197	0	return 2;
198	0	}
199
200		static void asn1_put_length(unsigned char **pp, int length)
201	17.3k	{
202	17.3k	unsigned char p = pp;
203	17.3k	int i, len;
204
205	17.3k	if (length <= 127) {
206	6.38k	*(p++) = (unsigned char)length;
207	10.9k	} else {
208	10.9k	len = length;
209	25.5k	for (i = 0; len > 0; i++)
210	14.5k	len >>= 8;
211	10.9k	*(p++) = i \| 0x80;
212	10.9k	len = i;
213	25.5k	while (i-- > 0) {
214	14.5k	p[i] = length & 0xff;
215	14.5k	length >>= 8;
216	14.5k	}
217	10.9k	p += len;
218	10.9k	}
219	17.3k	*pp = p;
220	17.3k	}
221
222		int ASN1_object_size(int constructed, int length, int tag)
223	46.2k	{
224	46.2k	int ret = 1;
225
226	46.2k	if (length < 0)
227	0	return -1;
228	46.2k	if (tag >= 31) {
229	0	while (tag > 0) {
230	0	tag >>= 7;
231	0	ret++;
232	0	}
233	0	}
234	46.2k	if (constructed == 2) {
235	0	ret += 3;
236	46.2k	} else {
237	46.2k	ret++;
238	46.2k	if (length > 127) {
239	27.4k	int tmplen = length;
240	63.8k	while (tmplen > 0) {
241	36.3k	tmplen >>= 8;
242	36.3k	ret++;
243	36.3k	}
244	27.4k	}
245	46.2k	}
246	46.2k	if (ret >= INT_MAX - length)
247	0	return -1;
248	46.2k	return ret + length;
249	46.2k	}
250
251		void ossl_asn1_bit_string_clear_unused_bits(ASN1_STRING *str)
252	0	{
253	0	str->flags &= ~0x07;
254	0	str->flags &= ~ASN1_STRING_FLAG_BITS_LEFT;
255	0	}
256
257		void ossl_asn1_bit_string_set_unused_bits(ASN1_STRING *str, unsigned int num)
258	0	{
259	0	ossl_asn1_bit_string_clear_unused_bits(str);
260	0	str->flags \|= ASN1_STRING_FLAG_BITS_LEFT \| (num & 0x07);
261	0	}
262
263		int ASN1_STRING_copy(ASN1_STRING dst, const ASN1_STRING str)
264	0	{
265	0	if (str == NULL)
266	0	return 0;
267	0	dst->type = str->type;
268	0	if (!ossl_asn1_string_set_internal(dst, str->data, str->length,
269	0	/add_nul_byte=/0))
270	0	return 0;
271		/* Copy flags but preserve embed value */
272	0	dst->flags &= ASN1_STRING_FLAG_EMBED;
273	0	dst->flags \|= str->flags & ~ASN1_STRING_FLAG_EMBED;
274	0	return 1;
275	0	}
276
277		ASN1_STRING ASN1_STRING_dup(const ASN1_STRING str)
278	0	{
279	0	ASN1_STRING *ret;
280
281	0	if (!str)
282	0	return NULL;
283	0	ret = ASN1_STRING_new();
284	0	if (ret == NULL)
285	0	return NULL;
286	0	if (!ASN1_STRING_copy(ret, str)) {
287	0	ASN1_STRING_free(ret);
288	0	return NULL;
289	0	}
290	0	return ret;
291	0	}
292
293		int ossl_asn1_string_set_internal(ASN1_STRING str, const uint8_t data,
294		int len_in, int add_nul_byte)
295	0	{
296	0	size_t len, alloc_len;
297
298	0	#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
299		/*
300		* Force no NUL byte for callers that are requesting it
301		* 0 length object data will be NULL
302		*/
303	0	add_nul_byte = 0;
304	0	#endif
305	0	if (len_in < -1) {
306	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL);
307	0	return 0;
308	0	}
309	0	if (len_in == -1) {
310	0	if (data == NULL)
311	0	return 0;
312	0	len = strlen((const char *)data);
313	0	} else {
314	0	len = (size_t)len_in;
315	0	}
316		/*
317		* Add one to the length to allow for adding an a '\0' terminator
318		* "even though this isn't strictly necessary".
319		*/
320	0	alloc_len = add_nul_byte ? len + 1 : len;
321
322	0	if (alloc_len > INT_MAX) {
323	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LARGE);
324	0	return 0;
325	0	}
326
327	0	if ((str->flags & ASN1_STRING_FLAG_DATA_NOT_OWNED)) {
328	0	str->data = NULL;
329	0	str->length = 0;
330	0	str->flags &= ~ASN1_STRING_FLAG_DATA_NOT_OWNED;
331	0	}
332
333		/* Ensure copying a 0 length data field is defined. */
334	0	if (alloc_len == 0) {
335	0	OPENSSL_free(str->data);
336	0	str->data = NULL;
337	0	str->length = 0;
338	0	return 1;
339	0	}
340
341	0	if ((size_t)str->length != alloc_len) {
342	0	uint8_t *c;
343	0	c = OPENSSL_realloc(str->length == 0 ? NULL : str->data, alloc_len);
344	0	if (c == NULL)
345	0	return 0;
346	0	str->data = c;
347	0	}
348		/* length never includes the added \0 byte */
349	0	str->length = (int)len;
350
351	0	if (data != NULL && str->data != NULL) {
352	0	memcpy(str->data, data, len);
353	0	if (add_nul_byte) {
354		/*
355		* Add a '\0' terminator. This should not be necessary - but we add it as
356		* a safety precaution
357		*/
358	0	str->data[len] = '\0';
359	0	}
360	0	}
361	0	ossl_asn1_bit_string_clear_unused_bits(str);
362
363	0	return 1;
364	0	}
365
366		#ifndef OPENSSL_NO_DEPRECATED_4_1
367		int ASN1_STRING_set(ASN1_STRING str, const void _data, int len_in)
368	0	{
369	0	return ossl_asn1_string_set_internal(str, (const uint8_t *)_data, len_in,
370	0	/add_nul_byte=/1);
371	0	}
372		#endif
373
374		void ASN1_STRING_set0(ASN1_STRING str, void data, int len)
375	0	{
376	0	if (!(str->flags & ASN1_STRING_FLAG_DATA_NOT_OWNED)) {
377	0	OPENSSL_clear_free(str->data, str->length);
378	0	}
379	0	str->flags &= ~ASN1_STRING_FLAG_DATA_NOT_OWNED;
380	0	str->data = data;
381	0	str->length = len;
382	0	}
383
384		int ASN1_STRING_set_data(ASN1_STRING str, const uint8_t data, size_t len_in)
385	0	{
386	0	if (str->type == V_ASN1_BIT_STRING) {
387	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_BITSTRING_FORMAT);
388	0	return 0;
389	0	}
390		/* This will go away once ASN1_STRING can size_t internally */
391	0	if (len_in > INT_MAX) {
392	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LARGE);
393	0	return 0;
394	0	}
395	0	return ossl_asn1_string_set_internal(str, data, (int)len_in, /add_nul_byte=/0);
396	0	}
397
398		int ASN1_STRING_set_string(ASN1_STRING str, const char c_string)
399	0	{
400	0	return ASN1_STRING_set_data(str, (const uint8_t *)c_string,
401	0	strlen(c_string));
402	0	}
403
404		ASN1_STRING *ASN1_STRING_new(void)
405	0	{
406	0	return ASN1_STRING_type_new(V_ASN1_OCTET_STRING);
407	0	}
408
409		ASN1_STRING *ASN1_STRING_type_new(int type)
410	0	{
411	0	ASN1_STRING *ret;
412
413	0	ret = OPENSSL_zalloc(sizeof(*ret));
414	0	if (ret == NULL)
415	0	return NULL;
416	0	ret->type = type;
417	0	return ret;
418	0	}
419
420		ASN1_STRING ASN1_STRING_new_not_owned(int type, const uint8_t data,
421		size_t length)
422	0	{
423	0	ASN1_STRING *ret;
424
425	0	if (type == V_ASN1_BIT_STRING)
426	0	return NULL;
427
428	0	if (data == NULL \|\| length == 0)
429	0	return NULL;
430
431	0	if (length > INT_MAX)
432	0	return NULL;
433
434	0	ret = OPENSSL_zalloc(sizeof(*ret));
435	0	if (ret == NULL)
436	0	return NULL;
437
438	0	ret->type = type;
439	0	ret->data = (unsigned char *)data;
440	0	ret->length = (int)length;
441	0	ret->flags \|= ASN1_STRING_FLAG_DATA_NOT_OWNED;
442
443	0	return ret;
444	0	}
445
446		void ossl_asn1_string_free_internal(ASN1_STRING *a, int clear, int embed)
447	0	{
448	0	if (a == NULL)
449	0	return;
450
451	0	if ((a->flags & ASN1_STRING_FLAG_DATA_NOT_OWNED)) {
452	0	a->data = NULL;
453	0	a->length = 0;
454	0	a->flags &= ~ASN1_STRING_FLAG_DATA_NOT_OWNED;
455	0	}
456
457	0	if (!(a->flags & ASN1_STRING_FLAG_NDEF)) {
458	0	if (clear)
459	0	OPENSSL_clear_free(a->data, a->length);
460	0	else
461	0	OPENSSL_free(a->data);
462	0	}
463		/*
464		* TODO(beck): Add an assert here to verify that the embed arg is
465		* always set to match the flag, and then get rid of the arg.
466		*/
467	0	if (!embed && !(a->flags & ASN1_STRING_FLAG_EMBED)) {
468	0	if (clear)
469	0	OPENSSL_clear_free(a, sizeof(*a));
470	0	else
471	0	OPENSSL_free(a);
472	0	}
473	0	}
474
475		void ASN1_STRING_free(ASN1_STRING *a)
476	0	{
477	0	if (a == NULL)
478	0	return;
479
480	0	ossl_asn1_string_free_internal(a, 0, a->flags & ASN1_STRING_FLAG_EMBED);
481	0	}
482
483		void ASN1_STRING_clear_free(ASN1_STRING *a)
484	0	{
485	0	if (a == NULL)
486	0	return;
487
488	0	ossl_asn1_string_free_internal(a, 1, a->flags & ASN1_STRING_FLAG_EMBED);
489	0	}
490
491		int ASN1_STRING_cmp(const ASN1_STRING a, const ASN1_STRING b)
492	0	{
493	0	int i;
494
495	0	i = (a->length - b->length);
496	0	if (i == 0) {
497	0	if (a->length != 0)
498	0	i = memcmp(a->data, b->data, a->length);
499	0	if (i == 0)
500	0	return a->type - b->type;
501	0	else
502	0	return i;
503	0	} else {
504	0	return i;
505	0	}
506	0	}
507
508		#ifndef OPENSSL_NO_DEPRECATED_4_1
509		int ASN1_STRING_length(const ASN1_STRING *x)
510	0	{
511	0	return x->length;
512	0	}
513		#endif
514
515		size_t ASN1_STRING_length_ex(const ASN1_STRING *x)
516	0	{
517	0	return (size_t)x->length;
518	0	}
519
520		#ifndef OPENSSL_NO_DEPRECATED_3_0
521		void ASN1_STRING_length_set(ASN1_STRING *x, int len)
522	0	{
523	0	x->length = len;
524	0	}
525		#endif
526
527		int ASN1_STRING_type(const ASN1_STRING *x)
528	0	{
529	0	return x->type;
530	0	}
531
532		const unsigned char ASN1_STRING_get0_data(const ASN1_STRING x)
533	0	{
534	0	return x->data;
535	0	}
536
537		/* \|max_len\| excludes NUL terminator and may be 0 to indicate no restriction */
538		char ossl_sk_ASN1_UTF8STRING2text(STACK_OF(ASN1_UTF8STRING) text,
539		const char *sep, size_t max_len)
540	0	{
541	0	int i;
542	0	ASN1_UTF8STRING *current;
543	0	size_t length = 0, sep_len;
544	0	char *result = NULL;
545	0	char *p;
546
547	0	if (sep == NULL)
548	0	sep = "";
549	0	sep_len = strlen(sep);
550
551	0	for (i = 0; i < sk_ASN1_UTF8STRING_num(text); i++) {
552	0	current = sk_ASN1_UTF8STRING_value(text, i);
553	0	if (i > 0)
554	0	length += sep_len;
555	0	length += ASN1_STRING_length_ex(current);
556	0	if (max_len != 0 && length > max_len)
557	0	return NULL;
558	0	}
559	0	if ((result = OPENSSL_malloc(length + 1)) == NULL)
560	0	return NULL;
561
562	0	p = result;
563	0	for (i = 0; i < sk_ASN1_UTF8STRING_num(text); i++) {
564	0	current = sk_ASN1_UTF8STRING_value(text, i);
565	0	length = ASN1_STRING_length_ex(current);
566	0	if (i > 0 && sep_len > 0) {
567	0	strncpy(p, sep, sep_len + 1); /* using + 1 to silence gcc warning */
568	0	p += sep_len;
569	0	}
570	0	strncpy(p, (const char *)ASN1_STRING_get0_data(current), length);
571	0	p += length;
572	0	}
573	0	*p = '\0';
574
575	0	return result;
576	0	}