2 * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
5 * Licensed under the Apache License 2.0 (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
12 #include <openssl/ebcdic.h>
13 #include <openssl/err.h>
14 #include <openssl/params.h>
17 * When processing text to params, we're trying to be smart with numbers.
18 * Instead of handling each specific separate integer type, we use a bignum
19 * and ensure that it isn't larger than the expected size, and we then make
20 * sure it is the expected size... if there is one given.
21 * (if the size can be arbitrary, then we give whatever we have)
24 static int prepare_from_text(const OSSL_PARAM *paramdefs, const char *key,
25 const char *value, size_t value_n,
26 /* Output parameters */
27 const OSSL_PARAM **paramdef, int *ishex,
28 size_t *buf_n, BIGNUM **tmpbn, int *found)
33 * ishex is used to translate legacy style string controls in hex format
34 * to octet string parameters.
36 *ishex = strncmp(key, "hex", 3) == 0;
41 p = *paramdef = OSSL_PARAM_locate_const(paramdefs, key);
47 switch (p->data_type) {
48 case OSSL_PARAM_INTEGER:
49 case OSSL_PARAM_UNSIGNED_INTEGER:
51 BN_hex2bn(tmpbn, value);
53 BN_dec2bn(tmpbn, value);
59 * 2s complement negate, part 1
61 * BN_bn2nativepad puts the absolute value of the number in the
62 * buffer, i.e. if it's negative, we need to deal with it. We do
63 * it by subtracting 1 here and inverting the bytes in
64 * construct_from_text() below.
66 if (p->data_type == OSSL_PARAM_INTEGER && BN_is_negative(*tmpbn)
67 && !BN_sub_word(*tmpbn, 1)) {
71 *buf_n = BN_num_bytes(*tmpbn);
74 * TODO(v3.0) is this the right way to do this? This code expects
75 * a zero data size to simply mean "arbitrary size".
77 if (p->data_size > 0) {
78 if (*buf_n >= p->data_size) {
79 ERR_raise(ERR_LIB_CRYPTO, CRYPTO_R_TOO_SMALL_BUFFER);
80 /* Since this is a different error, we don't break */
83 /* Change actual size to become the desired size. */
84 *buf_n = p->data_size;
87 case OSSL_PARAM_UTF8_STRING:
89 ERR_raise(ERR_LIB_CRYPTO, ERR_R_PASSED_INVALID_ARGUMENT);
92 *buf_n = strlen(value) + 1;
94 case OSSL_PARAM_OCTET_STRING:
96 *buf_n = strlen(value) >> 1;
106 static int construct_from_text(OSSL_PARAM *to, const OSSL_PARAM *paramdef,
107 const char *value, size_t value_n, int ishex,
108 void *buf, size_t buf_n, BIGNUM *tmpbn)
114 switch (paramdef->data_type) {
115 case OSSL_PARAM_INTEGER:
116 case OSSL_PARAM_UNSIGNED_INTEGER:
119 if ((new_value = OPENSSL_malloc(new_value_n)) == NULL) {
125 BN_bn2nativepad(tmpbn, buf, buf_n);
128 * 2s complement negate, part two.
130 * Because we did the first part on the BIGNUM itself, we can just
131 * invert all the bytes here and be done with it.
133 if (paramdef->data_type == OSSL_PARAM_INTEGER
134 && BN_is_negative(tmpbn)) {
138 for (cp = buf; i-- > 0; cp++)
142 case OSSL_PARAM_UTF8_STRING:
143 #ifdef CHARSET_EBCDIC
144 ebcdic2ascii(buf, value, buf_n);
146 strncpy(buf, value, buf_n);
149 case OSSL_PARAM_OCTET_STRING:
153 if (!OPENSSL_hexstr2buf_ex(buf, buf_n, &l, value, ':'))
156 memcpy(buf, value, buf_n);
164 to->data_size = buf_n;
165 to->return_size = OSSL_PARAM_UNMODIFIED;
170 int OSSL_PARAM_allocate_from_text(OSSL_PARAM *to,
171 const OSSL_PARAM *paramdefs,
172 const char *key, const char *value,
173 size_t value_n, int *found)
175 const OSSL_PARAM *paramdef = NULL;
179 BIGNUM *tmpbn = NULL;
182 if (to == NULL || paramdefs == NULL)
185 if (!prepare_from_text(paramdefs, key, value, value_n,
186 ¶mdef, &ishex, &buf_n, &tmpbn, found))
189 if ((buf = OPENSSL_zalloc(buf_n > 0 ? buf_n : 1)) == NULL) {
190 ERR_raise(ERR_LIB_CRYPTO, ERR_R_MALLOC_FAILURE);
194 ok = construct_from_text(to, paramdef, value, value_n, ishex,