/src/openssl/crypto/asn1/x_int64.c

Source
/*
 * Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include <inttypes.h>
#include "internal/cryptlib.h"
#include "internal/numbers.h"
#include <openssl/asn1t.h>
#include <openssl/bn.h>
#include "asn1_local.h"

/*
 * Custom primitive types for handling int32_t, int64_t, uint32_t, uint64_t.
 * This converts between an ASN1_INTEGER and those types directly.
 * This is preferred to using the LONG / ZLONG primitives.
 */

/*
 * We abuse the ASN1_ITEM fields |size| as a flags field
 */
#define INTxx_FLAG_ZERO_DEFAULT (1 << 0)
#define INTxx_FLAG_SIGNED (1 << 1)

static int uint64_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
    if ((*pval = (ASN1_VALUE *)OPENSSL_zalloc(sizeof(uint64_t))) == NULL)
        return 0;
    return 1;
}

static void uint64_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
    OPENSSL_free(*pval);
    *pval = NULL;
}

static void uint64_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
    **(uint64_t **)pval = 0;
}

static int uint64_i2c(const ASN1_VALUE **pval, unsigned char *cont, int *putype,
    const ASN1_ITEM *it)
{
    uint64_t utmp;
    int neg = 0;
    /* this exists to bypass broken gcc optimization */
    char *cp = (char *)*pval;

    /* use memcpy, because we may not be uint64_t aligned */
    memcpy(&utmp, cp, sizeof(utmp));

    if ((it->size & INTxx_FLAG_ZERO_DEFAULT) == INTxx_FLAG_ZERO_DEFAULT
        && utmp == 0)
        return -1;
    if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED
        && (int64_t)utmp < 0) {
        /* ossl_i2c_uint64_int() assumes positive values */
        utmp = 0 - utmp;
        neg = 1;
    }

    return ossl_i2c_uint64_int(cont, utmp, neg);
}

static int uint64_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
    int utype, char *free_cont, const ASN1_ITEM *it)
{
    uint64_t utmp = 0;
    char *cp;
    int neg = 0;

    if (*pval == NULL && !uint64_new(pval, it))
        return 0;

    cp = (char *)*pval;

    /*
     * Strictly speaking, zero length is malformed.  However, long_c2i
     * (x_long.c) encodes 0 as a zero length INTEGER (wrongly, of course),
     * so for the sake of backward compatibility, we still decode zero
     * length INTEGERs as the number zero.
     */
    if (len == 0)
        goto long_compat;

    if (!ossl_c2i_uint64_int(&utmp, &neg, &cont, len))
        return 0;
    if ((it->size & INTxx_FLAG_SIGNED) == 0 && neg) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_NEGATIVE_VALUE);
        return 0;
    }
    if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED
        && !neg && utmp > INT64_MAX) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LARGE);
        return 0;
    }
    if (neg)
        /* ossl_c2i_uint64_int() returns positive values */
        utmp = 0 - utmp;

long_compat:
    memcpy(cp, &utmp, sizeof(utmp));
    return 1;
}

static int uint64_print(BIO *out, const ASN1_VALUE **pval, const ASN1_ITEM *it,
    int indent, const ASN1_PCTX *pctx)
{
    if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED)
        return BIO_printf(out, "%" PRId64 "\n", **(int64_t **)pval);
    return BIO_printf(out, "%" PRIu64 "\n", **(uint64_t **)pval);
}

/* 32-bit variants */

static int uint32_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
    if ((*pval = (ASN1_VALUE *)OPENSSL_zalloc(sizeof(uint32_t))) == NULL)
        return 0;
    return 1;
}

static void uint32_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
    OPENSSL_free(*pval);
    *pval = NULL;
}

static void uint32_clear(ASN1_VALUE **pval, const ASN1_ITEM *it)
{
    **(uint32_t **)pval = 0;
}

static int uint32_i2c(const ASN1_VALUE **pval, unsigned char *cont, int *putype,
    const ASN1_ITEM *it)
{
    uint32_t utmp;
    int neg = 0;
    /* this exists to bypass broken gcc optimization */
    char *cp = (char *)*pval;

    /* use memcpy, because we may not be uint32_t aligned */
    memcpy(&utmp, cp, sizeof(utmp));

    if ((it->size & INTxx_FLAG_ZERO_DEFAULT) == INTxx_FLAG_ZERO_DEFAULT
        && utmp == 0)
        return -1;
    if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED
        && (int32_t)utmp < 0) {
        /* ossl_i2c_uint64_int() assumes positive values */
        utmp = 0 - utmp;
        neg = 1;
    }

    return ossl_i2c_uint64_int(cont, (uint64_t)utmp, neg);
}

/*
 * Absolute value of INT32_MIN: we can't just use -INT32_MIN as it produces
 * overflow warnings.
 */

#define ABS_INT32_MIN ((uint32_t)INT32_MAX + 1)

static int uint32_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
    int utype, char *free_cont, const ASN1_ITEM *it)
{
    uint64_t utmp = 0;
    uint32_t utmp2 = 0;
    char *cp;
    int neg = 0;

    if (*pval == NULL && !uint64_new(pval, it))
        return 0;

    cp = (char *)*pval;

    /*
     * Strictly speaking, zero length is malformed.  However, long_c2i
     * (x_long.c) encodes 0 as a zero length INTEGER (wrongly, of course),
     * so for the sake of backward compatibility, we still decode zero
     * length INTEGERs as the number zero.
     */
    if (len == 0)
        goto long_compat;

    if (!ossl_c2i_uint64_int(&utmp, &neg, &cont, len))
        return 0;
    if ((it->size & INTxx_FLAG_SIGNED) == 0 && neg) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_NEGATIVE_VALUE);
        return 0;
    }
    if (neg) {
        if (utmp > ABS_INT32_MIN) {
            ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL);
            return 0;
        }
        utmp = 0 - utmp;
    } else {
        if (((it->size & INTxx_FLAG_SIGNED) != 0 && utmp > INT32_MAX)
            || ((it->size & INTxx_FLAG_SIGNED) == 0 && utmp > UINT32_MAX)) {
            ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LARGE);
            return 0;
        }
    }

long_compat:
    utmp2 = (uint32_t)utmp;
    memcpy(cp, &utmp2, sizeof(utmp2));
    return 1;
}

static int uint32_print(BIO *out, const ASN1_VALUE **pval, const ASN1_ITEM *it,
    int indent, const ASN1_PCTX *pctx)
{
    if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED)
        return BIO_printf(out, "%d\n", (int)**(int32_t **)pval);
    return BIO_printf(out, "%u\n", (unsigned int)**(uint32_t **)pval);
}

/* Define the primitives themselves */

static ASN1_PRIMITIVE_FUNCS uint32_pf = {
    NULL, 0,
    uint32_new,
    uint32_free,
    uint32_clear,
    uint32_c2i,
    uint32_i2c,
    uint32_print
};

static ASN1_PRIMITIVE_FUNCS uint64_pf = {
    NULL, 0,
    uint64_new,
    uint64_free,
    uint64_clear,
    uint64_c2i,
    uint64_i2c,
    uint64_print
};

ASN1_ITEM_start(INT32)
    ASN1_ITYPE_PRIMITIVE,
    V_ASN1_INTEGER, NULL, 0, &uint32_pf,
    INTxx_FLAG_SIGNED, "INT32" ASN1_ITEM_end(INT32)

                           ASN1_ITEM_start(UINT32) ASN1_ITYPE_PRIMITIVE,
    V_ASN1_INTEGER, NULL, 0, &uint32_pf, 0, "UINT32" ASN1_ITEM_end(UINT32)

                                                ASN1_ITEM_start(INT64) ASN1_ITYPE_PRIMITIVE,
    V_ASN1_INTEGER, NULL, 0, &uint64_pf,
    INTxx_FLAG_SIGNED, "INT64" ASN1_ITEM_end(INT64)

                           ASN1_ITEM_start(UINT64) ASN1_ITYPE_PRIMITIVE,
    V_ASN1_INTEGER, NULL, 0, &uint64_pf, 0, "UINT64" ASN1_ITEM_end(UINT64)

                                                ASN1_ITEM_start(ZINT32) ASN1_ITYPE_PRIMITIVE,
    V_ASN1_INTEGER, NULL, 0, &uint32_pf,
    INTxx_FLAG_ZERO_DEFAULT | INTxx_FLAG_SIGNED, "ZINT32" ASN1_ITEM_end(ZINT32)

                                                     ASN1_ITEM_start(ZUINT32) ASN1_ITYPE_PRIMITIVE,
    V_ASN1_INTEGER, NULL, 0, &uint32_pf,
    INTxx_FLAG_ZERO_DEFAULT, "ZUINT32" ASN1_ITEM_end(ZUINT32)

                                 ASN1_ITEM_start(ZINT64) ASN1_ITYPE_PRIMITIVE,
    V_ASN1_INTEGER, NULL, 0, &uint64_pf,
    INTxx_FLAG_ZERO_DEFAULT | INTxx_FLAG_SIGNED, "ZINT64" ASN1_ITEM_end(ZINT64)

                                                     ASN1_ITEM_start(ZUINT64) ASN1_ITYPE_PRIMITIVE,
    V_ASN1_INTEGER, NULL, 0, &uint64_pf,
    INTxx_FLAG_ZERO_DEFAULT, "ZUINT64" ASN1_ITEM_end(ZUINT64)

Coverage Report

Created: 2026-06-08 06:07

Line	Count	Source
1		/*
2		* Copyright 2017-2021 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 <inttypes.h>
12		#include "internal/cryptlib.h"
13		#include "internal/numbers.h"
14		#include <openssl/asn1t.h>
15		#include <openssl/bn.h>
16		#include "asn1_local.h"
17
18		/*
19		* Custom primitive types for handling int32_t, int64_t, uint32_t, uint64_t.
20		* This converts between an ASN1_INTEGER and those types directly.
21		* This is preferred to using the LONG / ZLONG primitives.
22		*/
23
24		/*
25		* We abuse the ASN1_ITEM fields \|size\| as a flags field
26		*/
27	0	#define INTxx_FLAG_ZERO_DEFAULT (1 << 0)
28	0	#define INTxx_FLAG_SIGNED (1 << 1)
29
30		static int uint64_new(ASN1_VALUE *pval, const ASN1_ITEM it)
31	0	{
32	0	if ((pval = (ASN1_VALUE )OPENSSL_zalloc(sizeof(uint64_t))) == NULL)
33	0	return 0;
34	0	return 1;
35	0	}
36
37		static void uint64_free(ASN1_VALUE *pval, const ASN1_ITEM it)
38	0	{
39	0	OPENSSL_free(*pval);
40	0	*pval = NULL;
41	0	}
42
43		static void uint64_clear(ASN1_VALUE *pval, const ASN1_ITEM it)
44	0	{
45	0	(uint64_t )pval = 0;
46	0	}
47
48		static int uint64_i2c(const ASN1_VALUE *pval, unsigned char cont, int *putype,
49		const ASN1_ITEM *it)
50	0	{
51	0	uint64_t utmp;
52	0	int neg = 0;
53		/* this exists to bypass broken gcc optimization */
54	0	char cp = (char )*pval;
55
56		/* use memcpy, because we may not be uint64_t aligned */
57	0	memcpy(&utmp, cp, sizeof(utmp));
58
59	0	if ((it->size & INTxx_FLAG_ZERO_DEFAULT) == INTxx_FLAG_ZERO_DEFAULT
60	0	&& utmp == 0)
61	0	return -1;
62	0	if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED
63	0	&& (int64_t)utmp < 0) {
64		/* ossl_i2c_uint64_int() assumes positive values */
65	0	utmp = 0 - utmp;
66	0	neg = 1;
67	0	}
68
69	0	return ossl_i2c_uint64_int(cont, utmp, neg);
70	0	}
71
72		static int uint64_c2i(ASN1_VALUE *pval, const unsigned char cont, int len,
73		int utype, char free_cont, const ASN1_ITEM it)
74	0	{
75	0	uint64_t utmp = 0;
76	0	char *cp;
77	0	int neg = 0;
78
79	0	if (*pval == NULL && !uint64_new(pval, it))
80	0	return 0;
81
82	0	cp = (char )pval;
83
84		/*
85		* Strictly speaking, zero length is malformed. However, long_c2i
86		* (x_long.c) encodes 0 as a zero length INTEGER (wrongly, of course),
87		* so for the sake of backward compatibility, we still decode zero
88		* length INTEGERs as the number zero.
89		*/
90	0	if (len == 0)
91	0	goto long_compat;
92
93	0	if (!ossl_c2i_uint64_int(&utmp, &neg, &cont, len))
94	0	return 0;
95	0	if ((it->size & INTxx_FLAG_SIGNED) == 0 && neg) {
96	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_NEGATIVE_VALUE);
97	0	return 0;
98	0	}
99	0	if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED
100	0	&& !neg && utmp > INT64_MAX) {
101	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LARGE);
102	0	return 0;
103	0	}
104	0	if (neg)
105		/* ossl_c2i_uint64_int() returns positive values */
106	0	utmp = 0 - utmp;
107
108	0	long_compat:
109	0	memcpy(cp, &utmp, sizeof(utmp));
110	0	return 1;
111	0	}
112
113		static int uint64_print(BIO out, const ASN1_VALUE pval, const ASN1_ITEM it,
114		int indent, const ASN1_PCTX *pctx)
115	0	{
116	0	if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED)
117	0	return BIO_printf(out, "%" PRId64 "\n", (int64_t )pval);
118	0	return BIO_printf(out, "%" PRIu64 "\n", (uint64_t )pval);
119	0	}
120
121		/* 32-bit variants */
122
123		static int uint32_new(ASN1_VALUE *pval, const ASN1_ITEM it)
124	0	{
125	0	if ((pval = (ASN1_VALUE )OPENSSL_zalloc(sizeof(uint32_t))) == NULL)
126	0	return 0;
127	0	return 1;
128	0	}
129
130		static void uint32_free(ASN1_VALUE *pval, const ASN1_ITEM it)
131	0	{
132	0	OPENSSL_free(*pval);
133	0	*pval = NULL;
134	0	}
135
136		static void uint32_clear(ASN1_VALUE *pval, const ASN1_ITEM it)
137	0	{
138	0	(uint32_t )pval = 0;
139	0	}
140
141		static int uint32_i2c(const ASN1_VALUE *pval, unsigned char cont, int *putype,
142		const ASN1_ITEM *it)
143	0	{
144	0	uint32_t utmp;
145	0	int neg = 0;
146		/* this exists to bypass broken gcc optimization */
147	0	char cp = (char )*pval;
148
149		/* use memcpy, because we may not be uint32_t aligned */
150	0	memcpy(&utmp, cp, sizeof(utmp));
151
152	0	if ((it->size & INTxx_FLAG_ZERO_DEFAULT) == INTxx_FLAG_ZERO_DEFAULT
153	0	&& utmp == 0)
154	0	return -1;
155	0	if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED
156	0	&& (int32_t)utmp < 0) {
157		/* ossl_i2c_uint64_int() assumes positive values */
158	0	utmp = 0 - utmp;
159	0	neg = 1;
160	0	}
161
162	0	return ossl_i2c_uint64_int(cont, (uint64_t)utmp, neg);
163	0	}
164
165		/*
166		* Absolute value of INT32_MIN: we can't just use -INT32_MIN as it produces
167		* overflow warnings.
168		*/
169
170	0	#define ABS_INT32_MIN ((uint32_t)INT32_MAX + 1)
171
172		static int uint32_c2i(ASN1_VALUE *pval, const unsigned char cont, int len,
173		int utype, char free_cont, const ASN1_ITEM it)
174	0	{
175	0	uint64_t utmp = 0;
176	0	uint32_t utmp2 = 0;
177	0	char *cp;
178	0	int neg = 0;
179
180	0	if (*pval == NULL && !uint64_new(pval, it))
181	0	return 0;
182
183	0	cp = (char )pval;
184
185		/*
186		* Strictly speaking, zero length is malformed. However, long_c2i
187		* (x_long.c) encodes 0 as a zero length INTEGER (wrongly, of course),
188		* so for the sake of backward compatibility, we still decode zero
189		* length INTEGERs as the number zero.
190		*/
191	0	if (len == 0)
192	0	goto long_compat;
193
194	0	if (!ossl_c2i_uint64_int(&utmp, &neg, &cont, len))
195	0	return 0;
196	0	if ((it->size & INTxx_FLAG_SIGNED) == 0 && neg) {
197	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_ILLEGAL_NEGATIVE_VALUE);
198	0	return 0;
199	0	}
200	0	if (neg) {
201	0	if (utmp > ABS_INT32_MIN) {
202	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_SMALL);
203	0	return 0;
204	0	}
205	0	utmp = 0 - utmp;
206	0	} else {
207	0	if (((it->size & INTxx_FLAG_SIGNED) != 0 && utmp > INT32_MAX)
208	0	\|\| ((it->size & INTxx_FLAG_SIGNED) == 0 && utmp > UINT32_MAX)) {
209	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_TOO_LARGE);
210	0	return 0;
211	0	}
212	0	}
213
214	0	long_compat:
215	0	utmp2 = (uint32_t)utmp;
216	0	memcpy(cp, &utmp2, sizeof(utmp2));
217	0	return 1;
218	0	}
219
220		static int uint32_print(BIO out, const ASN1_VALUE pval, const ASN1_ITEM it,
221		int indent, const ASN1_PCTX *pctx)
222	0	{
223	0	if ((it->size & INTxx_FLAG_SIGNED) == INTxx_FLAG_SIGNED)
224	0	return BIO_printf(out, "%d\n", (int)(int32_t )pval);
225	0	return BIO_printf(out, "%u\n", (unsigned int)(uint32_t )pval);
226	0	}
227
228		/* Define the primitives themselves */
229
230		static ASN1_PRIMITIVE_FUNCS uint32_pf = {
231		NULL, 0,
232		uint32_new,
233		uint32_free,
234		uint32_clear,
235		uint32_c2i,
236		uint32_i2c,
237		uint32_print
238		};
239
240		static ASN1_PRIMITIVE_FUNCS uint64_pf = {
241		NULL, 0,
242		uint64_new,
243		uint64_free,
244		uint64_clear,
245		uint64_c2i,
246		uint64_i2c,
247		uint64_print
248		};
249
250	0	ASN1_ITEM_start(INT32)
251	0	ASN1_ITYPE_PRIMITIVE,
252	0	V_ASN1_INTEGER, NULL, 0, &uint32_pf,
253	0	INTxx_FLAG_SIGNED, "INT32" ASN1_ITEM_end(INT32)
254
255	0	ASN1_ITEM_start(UINT32) ASN1_ITYPE_PRIMITIVE,
256	0	V_ASN1_INTEGER, NULL, 0, &uint32_pf, 0, "UINT32" ASN1_ITEM_end(UINT32)
257
258	0	ASN1_ITEM_start(INT64) ASN1_ITYPE_PRIMITIVE,
259	0	V_ASN1_INTEGER, NULL, 0, &uint64_pf,
260	0	INTxx_FLAG_SIGNED, "INT64" ASN1_ITEM_end(INT64)
261
262	0	ASN1_ITEM_start(UINT64) ASN1_ITYPE_PRIMITIVE,
263	0	V_ASN1_INTEGER, NULL, 0, &uint64_pf, 0, "UINT64" ASN1_ITEM_end(UINT64)
264
265	0	ASN1_ITEM_start(ZINT32) ASN1_ITYPE_PRIMITIVE,
266	0	V_ASN1_INTEGER, NULL, 0, &uint32_pf,
267	0	INTxx_FLAG_ZERO_DEFAULT \| INTxx_FLAG_SIGNED, "ZINT32" ASN1_ITEM_end(ZINT32)
268
269	0	ASN1_ITEM_start(ZUINT32) ASN1_ITYPE_PRIMITIVE,
270	0	V_ASN1_INTEGER, NULL, 0, &uint32_pf,
271	0	INTxx_FLAG_ZERO_DEFAULT, "ZUINT32" ASN1_ITEM_end(ZUINT32)
272
273	0	ASN1_ITEM_start(ZINT64) ASN1_ITYPE_PRIMITIVE,
274	0	V_ASN1_INTEGER, NULL, 0, &uint64_pf,
275	0	INTxx_FLAG_ZERO_DEFAULT \| INTxx_FLAG_SIGNED, "ZINT64" ASN1_ITEM_end(ZINT64)
276
277	0	ASN1_ITEM_start(ZUINT64) ASN1_ITYPE_PRIMITIVE,
278	0	V_ASN1_INTEGER, NULL, 0, &uint64_pf,
279	0	INTxx_FLAG_ZERO_DEFAULT, "ZUINT64" ASN1_ITEM_end(ZUINT64)