1 | /* |
2 | * Copyright 1995-2017 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 | |
16 | int 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 | |
54 | int 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 | ASN1err(ASN1_F_A2I_ASN1_INTEGER, 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 | ASN1err(ASN1_F_A2I_ASN1_INTEGER, 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 | ASN1err(ASN1_F_A2I_ASN1_INTEGER, |
123 | ASN1_R_NON_HEX_CHARACTERS); |
124 | goto err; |
125 | } |
126 | s[num + j] <<= 4; |
127 | s[num + j] |= m; |
128 | } |
129 | } |
130 | num += i; |
131 | if (again) |
132 | bufsize = BIO_gets(bp, buf, size); |
133 | else |
134 | break; |
135 | } |
136 | bs->length = num; |
137 | bs->data = s; |
138 | return 1; |
139 | err: |
140 | ASN1err(ASN1_F_A2I_ASN1_INTEGER, ASN1_R_SHORT_LINE); |
141 | OPENSSL_free(s); |
142 | return 0; |
143 | } |
144 | |
145 | int i2a_ASN1_ENUMERATED(BIO *bp, const ASN1_ENUMERATED *a) |
146 | { |
147 | return i2a_ASN1_INTEGER(bp, a); |
148 | } |
149 | |
150 | int a2i_ASN1_ENUMERATED(BIO *bp, ASN1_ENUMERATED *bs, char *buf, int size) |
151 | { |
152 | int rv = a2i_ASN1_INTEGER(bp, bs, buf, size); |
153 | if (rv == 1) |
154 | bs->type = V_ASN1_INTEGER | (bs->type & V_ASN1_NEG); |
155 | return rv; |
156 | } |
157 | |