| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved. |
| 3 | * |
| 4 | * Licensed under the OpenSSL license (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_STRING(BIO *bp, const ASN1_STRING *a, int type) |
| 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->length == 0) { |
| 26 | if (BIO_write(bp, "0", 1) != 1) |
| 27 | goto err; |
| 28 | n = 1; |
| 29 | } else { |
| 30 | for (i = 0; i < a->length; i++) { |
| 31 | if ((i != 0) && (i % 35 == 0)) { |
| 32 | if (BIO_write(bp, "\\\n", 2) != 2) |
| 33 | goto err; |
| 34 | n += 2; |
| 35 | } |
| 36 | buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f]; |
| 37 | buf[1] = h[((unsigned char)a->data[i]) & 0x0f]; |
| 38 | if (BIO_write(bp, buf, 2) != 2) |
| 39 | goto err; |
| 40 | n += 2; |
| 41 | } |
| 42 | } |
| 43 | return n; |
| 44 | err: |
| 45 | return -1; |
| 46 | } |
| 47 | |
| 48 | int a2i_ASN1_STRING(BIO *bp, ASN1_STRING *bs, char *buf, int size) |
| 49 | { |
| 50 | int i, j, k, m, n, again, bufsize; |
| 51 | unsigned char *s = NULL, *sp; |
| 52 | unsigned char *bufp; |
| 53 | int num = 0, slen = 0, first = 1; |
| 54 | |
| 55 | bufsize = BIO_gets(bp, buf, size); |
| 56 | for (;;) { |
| 57 | if (bufsize < 1) { |
| 58 | if (first) |
| 59 | break; |
| 60 | else |
| 61 | goto err; |
| 62 | } |
| 63 | first = 0; |
| 64 | |
| 65 | i = bufsize; |
| 66 | if (buf[i - 1] == '\n') |
| 67 | buf[--i] = '\0'; |
| 68 | if (i == 0) |
| 69 | goto err; |
| 70 | if (buf[i - 1] == '\r') |
| 71 | buf[--i] = '\0'; |
| 72 | if (i == 0) |
| 73 | goto err; |
| 74 | again = (buf[i - 1] == '\\'); |
| 75 | |
| 76 | for (j = i - 1; j > 0; j--) { |
| 77 | if (!ossl_isxdigit(buf[j])) { |
| 78 | i = j; |
| 79 | break; |
| 80 | } |
| 81 | } |
| 82 | buf[i] = '\0'; |
| 83 | /* |
| 84 | * We have now cleared all the crap off the end of the line |
| 85 | */ |
| 86 | if (i < 2) |
| 87 | goto err; |
| 88 | |
| 89 | bufp = (unsigned char *)buf; |
| 90 | |
| 91 | k = 0; |
| 92 | i -= again; |
| 93 | if (i % 2 != 0) { |
| 94 | ASN1err(ASN1_F_A2I_ASN1_STRING, ASN1_R_ODD_NUMBER_OF_CHARS); |
| 95 | OPENSSL_free(s); |
| 96 | return 0; |
| 97 | } |
| 98 | i /= 2; |
| 99 | if (num + i > slen) { |
| 100 | sp = OPENSSL_realloc(s, (unsigned int)num + i * 2); |
| 101 | if (sp == NULL) { |
| 102 | ASN1err(ASN1_F_A2I_ASN1_STRING, ERR_R_MALLOC_FAILURE); |
| 103 | OPENSSL_free(s); |
| 104 | return 0; |
| 105 | } |
| 106 | s = sp; |
| 107 | slen = num + i * 2; |
| 108 | } |
| 109 | for (j = 0; j < i; j++, k += 2) { |
| 110 | for (n = 0; n < 2; n++) { |
| 111 | m = OPENSSL_hexchar2int(bufp[k + n]); |
| 112 | if (m < 0) { |
| 113 | ASN1err(ASN1_F_A2I_ASN1_STRING, |
| 114 | ASN1_R_NON_HEX_CHARACTERS); |
| 115 | OPENSSL_free(s); |
| 116 | return 0; |
| 117 | } |
| 118 | s[num + j] <<= 4; |
| 119 | s[num + j] |= m; |
| 120 | } |
| 121 | } |
| 122 | num += i; |
| 123 | if (again) |
| 124 | bufsize = BIO_gets(bp, buf, size); |
| 125 | else |
| 126 | break; |
| 127 | } |
| 128 | bs->length = num; |
| 129 | bs->data = s; |
| 130 | return 1; |
| 131 | |
| 132 | err: |
| 133 | ASN1err(ASN1_F_A2I_ASN1_STRING, ASN1_R_SHORT_LINE); |
| 134 | OPENSSL_free(s); |
| 135 | return 0; |
| 136 | } |