mirror of https://github.com/openssl/openssl.git
137 lines
3.4 KiB
C
137 lines
3.4 KiB
C
/*
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* Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "crypto/ctype.h"
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#include "internal/cryptlib.h"
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#include <openssl/buffer.h>
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#include <openssl/asn1.h>
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int i2a_ASN1_STRING(BIO *bp, const ASN1_STRING *a, int type)
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{
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int i, n = 0;
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static const char *h = "0123456789ABCDEF";
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char buf[2];
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if (a == NULL)
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return 0;
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if (a->length == 0) {
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if (BIO_write(bp, "0", 1) != 1)
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goto err;
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n = 1;
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} else {
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for (i = 0; i < a->length; i++) {
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if ((i != 0) && (i % 35 == 0)) {
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if (BIO_write(bp, "\\\n", 2) != 2)
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goto err;
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n += 2;
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}
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buf[0] = h[((unsigned char)a->data[i] >> 4) & 0x0f];
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buf[1] = h[((unsigned char)a->data[i]) & 0x0f];
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if (BIO_write(bp, buf, 2) != 2)
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goto err;
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n += 2;
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}
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}
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return n;
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err:
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return -1;
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}
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int a2i_ASN1_STRING(BIO *bp, ASN1_STRING *bs, char *buf, int size)
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{
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int i, j, k, m, n, again, bufsize;
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unsigned char *s = NULL, *sp;
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unsigned char *bufp;
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int num = 0, slen = 0, first = 1;
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bufsize = BIO_gets(bp, buf, size);
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for (;;) {
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if (bufsize < 1) {
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if (first)
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break;
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else
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goto err;
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}
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first = 0;
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i = bufsize;
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if (buf[i - 1] == '\n')
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buf[--i] = '\0';
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if (i == 0)
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goto err;
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if (buf[i - 1] == '\r')
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buf[--i] = '\0';
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if (i == 0)
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goto err;
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again = (buf[i - 1] == '\\');
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for (j = i - 1; j > 0; j--) {
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if (!ossl_isxdigit(buf[j])) {
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i = j;
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break;
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}
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}
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buf[i] = '\0';
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/*
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* We have now cleared all the crap off the end of the line
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*/
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if (i < 2)
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goto err;
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bufp = (unsigned char *)buf;
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k = 0;
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i -= again;
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if (i % 2 != 0) {
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ASN1err(ASN1_F_A2I_ASN1_STRING, ASN1_R_ODD_NUMBER_OF_CHARS);
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OPENSSL_free(s);
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return 0;
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}
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i /= 2;
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if (num + i > slen) {
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sp = OPENSSL_realloc(s, (unsigned int)num + i * 2);
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if (sp == NULL) {
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ASN1err(ASN1_F_A2I_ASN1_STRING, ERR_R_MALLOC_FAILURE);
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OPENSSL_free(s);
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return 0;
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}
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s = sp;
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slen = num + i * 2;
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}
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for (j = 0; j < i; j++, k += 2) {
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for (n = 0; n < 2; n++) {
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m = OPENSSL_hexchar2int(bufp[k + n]);
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if (m < 0) {
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ASN1err(ASN1_F_A2I_ASN1_STRING,
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ASN1_R_NON_HEX_CHARACTERS);
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OPENSSL_free(s);
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return 0;
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}
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s[num + j] <<= 4;
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s[num + j] |= m;
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}
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}
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num += i;
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if (again)
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bufsize = BIO_gets(bp, buf, size);
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else
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break;
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}
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bs->length = num;
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bs->data = s;
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return 1;
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err:
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ASN1err(ASN1_F_A2I_ASN1_STRING, ASN1_R_SHORT_LINE);
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OPENSSL_free(s);
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return 0;
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}
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