1/*
2 * Copyright 1995-2020 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 "crypto/ctype.h"
12#include "internal/cryptlib.h"
13#include <openssl/buffer.h>
14#include <openssl/asn1.h>
15
16int i2a_ASN1_INTEGER(BIO *bp, const ASN1_INTEGER *a)
17{
18    int i, n = 0;
19    static const char *h = "0123456789ABCDEF";
20    char buf[2];
21
22    if (a == NULL)
23        return 0;
24
25    if (a->type & V_ASN1_NEG) {
26        if (BIO_write(bp, "-", 1) != 1)
27            goto err;
28        n = 1;
29    }
30
31    if (a->length == 0) {
32        if (BIO_write(bp, "00", 2) != 2)
33            goto err;
34        n += 2;
35    } else {
36        for (i = 0; i < a->length; i++) {
37            if ((i != 0) && (i % 35 == 0)) {
38                if (BIO_write(bp, "\\\n", 2) != 2)
39                    goto err;
40                n += 2;
41            }
42            buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
43            buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
44            if (BIO_write(bp, buf, 2) != 2)
45                goto err;
46            n += 2;
47        }
48    }
49    return n;
50 err:
51    return -1;
52}
53
54int a2i_ASN1_INTEGER(BIO *bp, ASN1_INTEGER *bs, char *buf, int size)
55{
56    int i, j, k, m, n, again, bufsize;
57    unsigned char *s = NULL, *sp;
58    unsigned char *bufp;
59    int num = 0, slen = 0, first = 1;
60
61    bs->type = V_ASN1_INTEGER;
62
63    bufsize = BIO_gets(bp, buf, size);
64    for (;;) {
65        if (bufsize < 1)
66            goto err;
67        i = bufsize;
68        if (buf[i - 1] == '\n')
69            buf[--i] = '\0';
70        if (i == 0)
71            goto err;
72        if (buf[i - 1] == '\r')
73            buf[--i] = '\0';
74        if (i == 0)
75            goto err;
76        again = (buf[i - 1] == '\\');
77
78        for (j = 0; j < i; j++) {
79            if (!ossl_isxdigit(buf[j]))
80            {
81                i = j;
82                break;
83            }
84        }
85        buf[i] = '\0';
86        /*
87         * We have now cleared all the crap off the end of the line
88         */
89        if (i < 2)
90            goto err;
91
92        bufp = (unsigned char *)buf;
93        if (first) {
94            first = 0;
95            if ((bufp[0] == '0') && (bufp[1] == '0')) {
96                bufp += 2;
97                i -= 2;
98            }
99        }
100        k = 0;
101        i -= again;
102        if (i % 2 != 0) {
103            ERR_raise(ERR_LIB_ASN1, ASN1_R_ODD_NUMBER_OF_CHARS);
104            OPENSSL_free(s);
105            return 0;
106        }
107        i /= 2;
108        if (num + i > slen) {
109            sp = OPENSSL_clear_realloc(s, slen, num + i * 2);
110            if (sp == NULL) {
111                ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
112                OPENSSL_free(s);
113                return 0;
114            }
115            s = sp;
116            slen = num + i * 2;
117        }
118        for (j = 0; j < i; j++, k += 2) {
119            for (n = 0; n < 2; n++) {
120                m = OPENSSL_hexchar2int(bufp[k + n]);
121                if (m < 0) {
122                    ERR_raise(ERR_LIB_ASN1, ASN1_R_NON_HEX_CHARACTERS);
123                    goto err;
124                }
125                s[num + j] <<= 4;
126                s[num + j] |= m;
127            }
128        }
129        num += i;
130        if (again)
131            bufsize = BIO_gets(bp, buf, size);
132        else
133            break;
134    }
135    bs->length = num;
136    bs->data = s;
137    return 1;
138 err:
139    ERR_raise(ERR_LIB_ASN1, ASN1_R_SHORT_LINE);
140    OPENSSL_free(s);
141    return 0;
142}
143
144int i2a_ASN1_ENUMERATED(BIO *bp, const ASN1_ENUMERATED *a)
145{
146    return i2a_ASN1_INTEGER(bp, a);
147}
148
149int a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size)
150{
151    int rv = a2i_ASN1_INTEGER(bp, bs, buf, size);
152    if (rv == 1)
153        bs->type = V_ASN1_INTEGER | (bs->type & V_ASN1_NEG);
154    return rv;
155}
156