/* $OpenBSD: a_int.c,v 1.49 2025/05/10 05:54:38 tb Exp $ */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <limits.h>
#include <stdio.h>
#include <string.h>

#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/bn.h>
#include <openssl/buffer.h>

#include "bytestring.h"
#include "err_local.h"

const ASN1_ITEM ASN1_INTEGER_it = {
        .itype = ASN1_ITYPE_PRIMITIVE,
        .utype = V_ASN1_INTEGER,
        .sname = "ASN1_INTEGER",
};
LCRYPTO_ALIAS(ASN1_INTEGER_it);

ASN1_INTEGER *
ASN1_INTEGER_new(void)
{
        return (ASN1_INTEGER *)ASN1_item_new(&ASN1_INTEGER_it);
}
LCRYPTO_ALIAS(ASN1_INTEGER_new);

static void
asn1_aint_clear(ASN1_INTEGER *aint)
{
        freezero(aint->data, aint->length);

        memset(aint, 0, sizeof(*aint));

        aint->type = V_ASN1_INTEGER;
}

void
ASN1_INTEGER_free(ASN1_INTEGER *a)
{
        ASN1_item_free((ASN1_VALUE *)a, &ASN1_INTEGER_it);
}
LCRYPTO_ALIAS(ASN1_INTEGER_free);

static int
ASN1_INTEGER_valid(const ASN1_INTEGER *a)
{
        return (a != NULL && a->length >= 0);
}

ASN1_INTEGER *
ASN1_INTEGER_dup(const ASN1_INTEGER *x)
{
        if (!ASN1_INTEGER_valid(x))
                return NULL;

        return ASN1_STRING_dup(x);
}
LCRYPTO_ALIAS(ASN1_INTEGER_dup);

int
ASN1_INTEGER_cmp(const ASN1_INTEGER *a, const ASN1_INTEGER *b)
{
        int ret = 1;

        /* Compare sign, then content. */
        if ((a->type & V_ASN1_NEG) == (b->type & V_ASN1_NEG))
                ret = ASN1_STRING_cmp(a, b);

        if ((a->type & V_ASN1_NEG) != 0)
                return -ret;

        return ret;
}
LCRYPTO_ALIAS(ASN1_INTEGER_cmp);

int
asn1_aint_get_uint64(CBS *cbs, uint64_t *out_val)
{
        uint64_t val = 0;
        uint8_t u8;

        *out_val = 0;

        while (CBS_len(cbs) > 0) {
                if (!CBS_get_u8(cbs, &u8))
                        return 0;
                if (val > (UINT64_MAX >> 8)) {
                        ASN1error(ASN1_R_TOO_LARGE);
                        return 0;
                }
                val = val << 8 | u8;
        }

        *out_val = val;

        return 1;
}

int
asn1_aint_set_uint64(uint64_t val, uint8_t **out_data, int *out_len)
{
        uint8_t *data = NULL;
        size_t data_len = 0;
        int started = 0;
        uint8_t u8;
        CBB cbb;
        int i;
        int ret = 0;

        if (!CBB_init(&cbb, sizeof(long)))
                goto err;

        if (out_data == NULL || out_len == NULL)
                goto err;
        if (*out_data != NULL || *out_len != 0)
                goto err;

        for (i = sizeof(uint64_t) - 1; i >= 0; i--) {
                u8 = (val >> (i * 8)) & 0xff;
                if (!started && i != 0 && u8 == 0)
                        continue;
                if (!CBB_add_u8(&cbb, u8))
                        goto err;
                started = 1;
        }

        if (!CBB_finish(&cbb, &data, &data_len))
                goto err;
        if (data_len > INT_MAX)
                goto err;

        *out_data = data;
        *out_len = (int)data_len;
        data = NULL;

        ret = 1;
 err:
        CBB_cleanup(&cbb);
        freezero(data, data_len);

        return ret;
}

int
asn1_aint_get_int64(CBS *cbs, int negative, int64_t *out_val)
{
        uint64_t val;

        if (!asn1_aint_get_uint64(cbs, &val))
                return 0;

        if (negative) {
                if (val > (uint64_t)INT64_MIN) {
                        ASN1error(ASN1_R_TOO_SMALL);
                        return 0;
                }
                *out_val = (int64_t)-val;
        } else {
                if (val > (uint64_t)INT64_MAX) {
                        ASN1error(ASN1_R_TOO_LARGE);
                        return 0;
                }
                *out_val = (int64_t)val;
        }

        return 1;
}

int
ASN1_INTEGER_get_uint64(uint64_t *out_val, const ASN1_INTEGER *aint)
{
        uint64_t val;
        CBS cbs;

        *out_val = 0;

        if (aint == NULL || aint->length < 0)
                return 0;

        if (aint->type == V_ASN1_NEG_INTEGER) {
                ASN1error(ASN1_R_ILLEGAL_NEGATIVE_VALUE);
                return 0;
        }
        if (aint->type != V_ASN1_INTEGER) {
                ASN1error(ASN1_R_WRONG_INTEGER_TYPE);
                return 0;
        }

        CBS_init(&cbs, aint->data, aint->length);

        if (!asn1_aint_get_uint64(&cbs, &val))
                return 0;

        *out_val = val;

        return 1;
}
LCRYPTO_ALIAS(ASN1_INTEGER_get_uint64);

int
ASN1_INTEGER_set_uint64(ASN1_INTEGER *aint, uint64_t val)
{
        asn1_aint_clear(aint);

        return asn1_aint_set_uint64(val, &aint->data, &aint->length);
}
LCRYPTO_ALIAS(ASN1_INTEGER_set_uint64);

int
ASN1_INTEGER_get_int64(int64_t *out_val, const ASN1_INTEGER *aint)
{
        CBS cbs;

        *out_val = 0;

        if (aint == NULL || aint->length < 0)
                return 0;

        if (aint->type != V_ASN1_INTEGER &&
            aint->type != V_ASN1_NEG_INTEGER) {
                ASN1error(ASN1_R_WRONG_INTEGER_TYPE);
                return 0;
        }

        CBS_init(&cbs, aint->data, aint->length);

        return asn1_aint_get_int64(&cbs, (aint->type == V_ASN1_NEG_INTEGER),
            out_val);
}
LCRYPTO_ALIAS(ASN1_INTEGER_get_int64);

int
ASN1_INTEGER_set_int64(ASN1_INTEGER *aint, int64_t val)
{
        uint64_t uval;

        asn1_aint_clear(aint);

        uval = (uint64_t)val;

        if (val < 0) {
                aint->type = V_ASN1_NEG_INTEGER;
                uval = -uval;
        }

        return asn1_aint_set_uint64(uval, &aint->data, &aint->length);
}
LCRYPTO_ALIAS(ASN1_INTEGER_set_int64);

long
ASN1_INTEGER_get(const ASN1_INTEGER *aint)
{
        int64_t val;

        if (aint == NULL)
                return 0;
        if (!ASN1_INTEGER_get_int64(&val, aint))
                return -1;
        if (val < LONG_MIN || val > LONG_MAX) {
                /* hmm... a bit ugly, return all ones */
                return -1;
        }

        return (long)val;
}
LCRYPTO_ALIAS(ASN1_INTEGER_get);

int
ASN1_INTEGER_set(ASN1_INTEGER *aint, long val)
{
        return ASN1_INTEGER_set_int64(aint, val);
}
LCRYPTO_ALIAS(ASN1_INTEGER_set);

ASN1_INTEGER *
BN_to_ASN1_INTEGER(const BIGNUM *bn, ASN1_INTEGER *ai)
{
        ASN1_INTEGER *ret;
        int len, j;

        if (ai == NULL)
                ret = ASN1_INTEGER_new();
        else
                ret = ai;
        if (ret == NULL) {
                ASN1error(ERR_R_NESTED_ASN1_ERROR);
                goto err;
        }

        if (!ASN1_INTEGER_valid(ret))
                goto err;

        if (BN_is_negative(bn))
                ret->type = V_ASN1_NEG_INTEGER;
        else
                ret->type = V_ASN1_INTEGER;
        j = BN_num_bits(bn);
        len = ((j == 0) ? 0 : ((j / 8) + 1));
        if (ret->length < len + 4) {
                unsigned char *new_data = realloc(ret->data, len + 4);
                if (!new_data) {
                        ASN1error(ERR_R_MALLOC_FAILURE);
                        goto err;
                }
                ret->data = new_data;
        }
        ret->length = BN_bn2bin(bn, ret->data);

        /* Correct zero case */
        if (!ret->length) {
                ret->data[0] = 0;
                ret->length = 1;
        }
        return (ret);

 err:
        if (ret != ai)
                ASN1_INTEGER_free(ret);
        return (NULL);
}
LCRYPTO_ALIAS(BN_to_ASN1_INTEGER);

BIGNUM *
ASN1_INTEGER_to_BN(const ASN1_INTEGER *ai, BIGNUM *bn)
{
        BIGNUM *ret;

        if (!ASN1_INTEGER_valid(ai))
                return (NULL);

        if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
                ASN1error(ASN1_R_BN_LIB);
        else if (ai->type == V_ASN1_NEG_INTEGER)
                BN_set_negative(ret, 1);
        return (ret);
}
LCRYPTO_ALIAS(ASN1_INTEGER_to_BN);

int
i2a_ASN1_INTEGER(BIO *bp, const ASN1_INTEGER *a)
{
        int i, n = 0;
        static const char h[] = "0123456789ABCDEF";
        char buf[2];

        if (a == NULL)
                return (0);

        if (a->type & V_ASN1_NEG) {
                if (BIO_write(bp, "-", 1) != 1)
                        goto err;
                n = 1;
        }

        if (a->length == 0) {
                if (BIO_write(bp, "00", 2) != 2)
                        goto err;
                n += 2;
        } else {
                for (i = 0; i < a->length; i++) {
                        if ((i != 0) && (i % 35 == 0)) {
                                if (BIO_write(bp, "\\\n", 2) != 2)
                                        goto err;
                                n += 2;
                        }
                        buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
                        buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
                        if (BIO_write(bp, buf, 2) != 2)
                                goto err;
                        n += 2;
                }
        }
        return (n);

 err:
        return (-1);
}
LCRYPTO_ALIAS(i2a_ASN1_INTEGER);

int
a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
{
        int ret = 0;
        int i, j,k, m,n, again, bufsize;
        unsigned char *s = NULL, *sp;
        unsigned char *bufp;
        int num = 0, slen = 0, first = 1;

        bs->type = V_ASN1_INTEGER;

        bufsize = BIO_gets(bp, buf, size);
        for (;;) {
                if (bufsize < 1)
                        goto err_sl;
                i = bufsize;
                if (buf[i - 1] == '\n')
                        buf[--i] = '\0';
                if (i == 0)
                        goto err_sl;
                if (buf[i - 1] == '\r')
                        buf[--i] = '\0';
                if (i == 0)
                        goto err_sl;
                if (buf[i - 1] == '\\') {
                        i--;
                        again = 1;
                } else
                        again = 0;
                buf[i] = '\0';
                if (i < 2)
                        goto err_sl;

                bufp = (unsigned char *)buf;
                if (first) {
                        first = 0;
                        if ((bufp[0] == '0') && (buf[1] == '0')) {
                                bufp += 2;
                                i -= 2;
                        }
                }
                k = 0;
                if (i % 2 != 0) {
                        ASN1error(ASN1_R_ODD_NUMBER_OF_CHARS);
                        goto err;
                }
                i /= 2;
                if (num + i > slen) {
                        if ((sp = recallocarray(s, slen, num + i, 1)) == NULL) {
                                ASN1error(ERR_R_MALLOC_FAILURE);
                                goto err;
                        }
                        s = sp;
                        slen = num + i;
                }
                for (j = 0; j < i; j++, k += 2) {
                        for (n = 0; n < 2; n++) {
                                m = bufp[k + n];
                                if ((m >= '0') && (m <= '9'))
                                        m -= '0';
                                else if ((m >= 'a') && (m <= 'f'))
                                        m = m - 'a' + 10;
                                else if ((m >= 'A') && (m <= 'F'))
                                        m = m - 'A' + 10;
                                else {
                                        ASN1error(ASN1_R_NON_HEX_CHARACTERS);
                                        goto err;
                                }
                                s[num + j] <<= 4;
                                s[num + j] |= m;
                        }
                }
                num += i;
                if (again)
                        bufsize = BIO_gets(bp, buf, size);
                else
                        break;
        }
        bs->length = num;
        bs->data = s;
        return (1);

 err_sl:
        ASN1error(ASN1_R_SHORT_LINE);
 err:
        free(s);
        return (ret);
}
LCRYPTO_ALIAS(a2i_ASN1_INTEGER);

static void
asn1_aint_twos_complement(uint8_t *data, size_t data_len)
{
        uint8_t carry = 1;
        ssize_t i;

        for (i = data_len - 1; i >= 0; i--) {
                data[i] = (data[i] ^ 0xff) + carry;
                if (data[i] != 0)
                        carry = 0;
        }
}

static int
asn1_aint_keep_twos_padding(const uint8_t *data, size_t data_len)
{
        size_t i;

        /*
         * If a two's complement value has a padding byte (0xff) and the rest
         * of the value is all zeros, the padding byte cannot be removed as when
         * converted from two's complement this becomes 0x01 (in the place of
         * the padding byte) followed by the same number of zero bytes.
         */
        if (data_len <= 1 || data[0] != 0xff)
                return 0;
        for (i = 1; i < data_len; i++) {
                if (data[i] != 0)
                        return 0;
        }
        return 1;
}

static int
i2c_ASN1_INTEGER_cbb(ASN1_INTEGER *aint, CBB *cbb)
{
        uint8_t *data = NULL;
        size_t data_len = 0;
        uint8_t padding, val;
        uint8_t msb;
        CBS cbs;
        int ret = 0;

        if (aint->length < 0)
                goto err;
        if (aint->data == NULL && aint->length != 0)
                goto err;

        if ((aint->type & ~V_ASN1_NEG) != V_ASN1_ENUMERATED &&
            (aint->type & ~V_ASN1_NEG) != V_ASN1_INTEGER)
                goto err;

        CBS_init(&cbs, aint->data, aint->length);

        /* Find the first non-zero byte. */
        while (CBS_len(&cbs) > 0) {
                if (!CBS_peek_u8(&cbs, &val))
                        goto err;
                if (val != 0)
                        break;
                if (!CBS_skip(&cbs, 1))
                        goto err;
        }

        /* A zero value is encoded as a single octet. */
        if (CBS_len(&cbs) == 0) {
                if (!CBB_add_u8(cbb, 0))
                        goto err;
                goto done;
        }

        if (!CBS_stow(&cbs, &data, &data_len))
                goto err;

        if ((aint->type & V_ASN1_NEG) != 0)
                asn1_aint_twos_complement(data, data_len);

        /* Topmost bit indicates sign, padding is all zeros or all ones. */
        msb = (data[0] >> 7);
        padding = (msb - 1) & 0xff;

        /* See if we need a padding octet to avoid incorrect sign. */
        if (((aint->type & V_ASN1_NEG) == 0 && msb == 1) ||
            ((aint->type & V_ASN1_NEG) != 0 && msb == 0)) {
                if (!CBB_add_u8(cbb, padding))
                        goto err;
        }
        if (!CBB_add_bytes(cbb, data, data_len))
                goto err;

 done:
        ret = 1;

 err:
        freezero(data, data_len);

        return ret;
}

int
i2c_ASN1_INTEGER(ASN1_INTEGER *aint, unsigned char **pp)
{
        uint8_t *data = NULL;
        size_t data_len = 0;
        CBB cbb;
        int ret = -3;

        if (!CBB_init(&cbb, 0))
                goto err;
        if (!i2c_ASN1_INTEGER_cbb(aint, &cbb))
                goto err;
        if (!CBB_finish(&cbb, &data, &data_len))
                goto err;
        if (data_len > INT_MAX)
                goto err;

        if (pp != NULL) {
                if ((uintptr_t)*pp > UINTPTR_MAX - data_len)
                        goto err;
                memcpy(*pp, data, data_len);
                *pp += data_len;
        }

        ret = data_len;

 err:
        freezero(data, data_len);
        CBB_cleanup(&cbb);

        return ret;
}

int
c2i_ASN1_INTEGER_cbs(ASN1_INTEGER **out_aint, CBS *cbs)
{
        ASN1_INTEGER *aint = NULL;
        uint8_t *data = NULL;
        size_t data_len = 0;
        uint8_t padding, val;
        uint8_t negative;
        int ret = 0;

        if (out_aint == NULL)
                goto err;

        if (*out_aint != NULL) {
                ASN1_INTEGER_free(*out_aint);
                *out_aint = NULL;
        }

        if (CBS_len(cbs) == 0) {
                /* XXX INVALID ENCODING? */
                ASN1error(ERR_R_ASN1_LENGTH_MISMATCH);
                goto err;
        }
        if (!CBS_peek_u8(cbs, &val))
                goto err;

        /* Topmost bit indicates sign, padding is all zeros or all ones. */
        negative = (val >> 7);
        padding = ~(negative - 1) & 0xff;

        /*
         * Ensure that the first 9 bits are not all zero or all one, as per
         * X.690 section 8.3.2. Remove the padding octet if possible.
         */
        if (CBS_len(cbs) > 1 && val == padding) {
                if (!asn1_aint_keep_twos_padding(CBS_data(cbs), CBS_len(cbs))) {
                        if (!CBS_get_u8(cbs, &padding))
                                goto err;
                        if (!CBS_peek_u8(cbs, &val))
                                goto err;
                        if ((val >> 7) == (padding >> 7)) {
                                /* XXX INVALID ENCODING? */
                                ASN1error(ERR_R_ASN1_LENGTH_MISMATCH);
                                goto err;
                        }
                }
        }

        if (!CBS_stow(cbs, &data, &data_len))
                goto err;
        if (data_len > INT_MAX)
                goto err;

        if ((aint = ASN1_INTEGER_new()) == NULL)
                goto err;

        /*
         * Negative integers are handled as a separate type - convert from
         * two's complement for internal representation.
         */
        if (negative) {
                aint->type = V_ASN1_NEG_INTEGER;
                asn1_aint_twos_complement(data, data_len);
        }

        aint->data = data;
        aint->length = (int)data_len;
        data = NULL;

        *out_aint = aint;
        aint = NULL;

        ret = 1;

 err:
        ASN1_INTEGER_free(aint);
        freezero(data, data_len);

        return ret;
}

ASN1_INTEGER *
c2i_ASN1_INTEGER(ASN1_INTEGER **out_aint, const unsigned char **pp, long len)
{
        ASN1_INTEGER *aint = NULL;
        CBS content;

        if (out_aint != NULL) {
                ASN1_INTEGER_free(*out_aint);
                *out_aint = NULL;
        }

        if (len < 0) {
                ASN1error(ASN1_R_LENGTH_ERROR);
                return NULL;
        }

        CBS_init(&content, *pp, len);

        if (!c2i_ASN1_INTEGER_cbs(&aint, &content))
                return NULL;

        *pp = CBS_data(&content);

        if (out_aint != NULL)
                *out_aint = aint;

        return aint;
}

int
i2d_ASN1_INTEGER(ASN1_INTEGER *a, unsigned char **out)
{
        return ASN1_item_i2d((ASN1_VALUE *)a, out, &ASN1_INTEGER_it);
}
LCRYPTO_ALIAS(i2d_ASN1_INTEGER);

ASN1_INTEGER *
d2i_ASN1_INTEGER(ASN1_INTEGER **a, const unsigned char **in, long len)
{
        return (ASN1_INTEGER *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
            &ASN1_INTEGER_it);
}
LCRYPTO_ALIAS(d2i_ASN1_INTEGER);

/* This is a version of d2i_ASN1_INTEGER that ignores the sign bit of
 * ASN1 integers: some broken software can encode a positive INTEGER
 * with its MSB set as negative (it doesn't add a padding zero).
 */

ASN1_INTEGER *
d2i_ASN1_UINTEGER(ASN1_INTEGER **a, const unsigned char **pp, long length)
{
        ASN1_INTEGER *ret = NULL;
        const unsigned char *p;
        unsigned char *s;
        long len;
        int inf, tag, xclass;
        int i;

        if ((a == NULL) || ((*a) == NULL)) {
                if ((ret = ASN1_INTEGER_new()) == NULL)
                        return (NULL);
        } else
                ret = (*a);

        if (!ASN1_INTEGER_valid(ret)) {
                i = ERR_R_ASN1_LENGTH_MISMATCH;
                goto err;
        }

        p = *pp;
        inf = ASN1_get_object(&p, &len, &tag, &xclass, length);
        if (inf & 0x80) {
                i = ASN1_R_BAD_OBJECT_HEADER;
                goto err;
        }

        if (tag != V_ASN1_INTEGER) {
                i = ASN1_R_EXPECTING_AN_INTEGER;
                goto err;
        }

        /* We must malloc stuff, even for 0 bytes otherwise it
         * signifies a missing NULL parameter. */
        if (len < 0 || len > INT_MAX) {
                i = ERR_R_ASN1_LENGTH_MISMATCH;
                goto err;
        }
        s = malloc(len + 1);
        if (s == NULL) {
                i = ERR_R_MALLOC_FAILURE;
                goto err;
        }
        ret->type = V_ASN1_INTEGER;
        if (len) {
                if ((*p == 0) && (len != 1)) {
                        p++;
                        len--;
                }
                memcpy(s, p, len);
                p += len;
        }

        free(ret->data);
        ret->data = s;
        ret->length = (int)len;
        if (a != NULL)
                (*a) = ret;
        *pp = p;
        return (ret);

 err:
        ASN1error(i);
        if (a == NULL || *a != ret)
                ASN1_INTEGER_free(ret);
        return (NULL);
}
LCRYPTO_ALIAS(d2i_ASN1_UINTEGER);