/src/openssl33/crypto/ec/ecp_oct.c

Source
/*
 * Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright (c) 2002, Oracle and/or its affiliates. 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
 */

/*
 * ECDSA low level APIs are deprecated for public use, but still ok for
 * internal use.
 */
#include "internal/deprecated.h"

#include <openssl/err.h>
#include <openssl/symhacks.h>

#include "ec_local.h"

int ossl_ec_GFp_simple_set_compressed_coordinates(const EC_GROUP *group,
    EC_POINT *point,
    const BIGNUM *x_, int y_bit,
    BN_CTX *ctx)
{
    BN_CTX *new_ctx = NULL;
    BIGNUM *tmp1, *tmp2, *x, *y;
    int ret = 0;

    if (ctx == NULL) {
        ctx = new_ctx = BN_CTX_new_ex(group->libctx);
        if (ctx == NULL)
            return 0;
    }

    y_bit = (y_bit != 0);

    BN_CTX_start(ctx);
    tmp1 = BN_CTX_get(ctx);
    tmp2 = BN_CTX_get(ctx);
    x = BN_CTX_get(ctx);
    y = BN_CTX_get(ctx);
    if (y == NULL)
        goto err;

    /*-
     * Recover y.  We have a Weierstrass equation
     *     y^2 = x^3 + a*x + b,
     * so  y  is one of the square roots of  x^3 + a*x + b.
     */

    /* tmp1 := x^3 */
    if (!BN_nnmod(x, x_, group->field, ctx))
        goto err;
    if (group->meth->field_decode == 0) {
        /* field_{sqr,mul} work on standard representation */
        if (!group->meth->field_sqr(group, tmp2, x_, ctx))
            goto err;
        if (!group->meth->field_mul(group, tmp1, tmp2, x_, ctx))
            goto err;
    } else {
        if (!BN_mod_sqr(tmp2, x_, group->field, ctx))
            goto err;
        if (!BN_mod_mul(tmp1, tmp2, x_, group->field, ctx))
            goto err;
    }

    /* tmp1 := tmp1 + a*x */
    if (group->a_is_minus3) {
        if (!BN_mod_lshift1_quick(tmp2, x, group->field))
            goto err;
        if (!BN_mod_add_quick(tmp2, tmp2, x, group->field))
            goto err;
        if (!BN_mod_sub_quick(tmp1, tmp1, tmp2, group->field))
            goto err;
    } else {
        if (group->meth->field_decode) {
            if (!group->meth->field_decode(group, tmp2, group->a, ctx))
                goto err;
            if (!BN_mod_mul(tmp2, tmp2, x, group->field, ctx))
                goto err;
        } else {
            /* field_mul works on standard representation */
            if (!group->meth->field_mul(group, tmp2, group->a, x, ctx))
                goto err;
        }

        if (!BN_mod_add_quick(tmp1, tmp1, tmp2, group->field))
            goto err;
    }

    /* tmp1 := tmp1 + b */
    if (group->meth->field_decode) {
        if (!group->meth->field_decode(group, tmp2, group->b, ctx))
            goto err;
        if (!BN_mod_add_quick(tmp1, tmp1, tmp2, group->field))
            goto err;
    } else {
        if (!BN_mod_add_quick(tmp1, tmp1, group->b, group->field))
            goto err;
    }

    ERR_set_mark();
    if (!BN_mod_sqrt(y, tmp1, group->field, ctx)) {
#ifndef FIPS_MODULE
        unsigned long err = ERR_peek_last_error();

        if (ERR_GET_LIB(err) == ERR_LIB_BN
            && ERR_GET_REASON(err) == BN_R_NOT_A_SQUARE) {
            ERR_pop_to_mark();
            ERR_raise(ERR_LIB_EC, EC_R_INVALID_COMPRESSED_POINT);
        } else
#endif
        {
            ERR_clear_last_mark();
            ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
        }
        goto err;
    }
    ERR_clear_last_mark();

    if (y_bit != BN_is_odd(y)) {
        if (BN_is_zero(y)) {
            int kron;

            kron = BN_kronecker(x, group->field, ctx);
            if (kron == -2)
                goto err;

            if (kron == 1)
                ERR_raise(ERR_LIB_EC, EC_R_INVALID_COMPRESSION_BIT);
            else
                /*
                 * BN_mod_sqrt() should have caught this error (not a square)
                 */
                ERR_raise(ERR_LIB_EC, EC_R_INVALID_COMPRESSED_POINT);
            goto err;
        }
        if (!BN_usub(y, group->field, y))
            goto err;
    }
    if (y_bit != BN_is_odd(y)) {
        ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    if (!EC_POINT_set_affine_coordinates(group, point, x, y, ctx))
        goto err;

    ret = 1;

err:
    BN_CTX_end(ctx);
    BN_CTX_free(new_ctx);
    return ret;
}

size_t ossl_ec_GFp_simple_point2oct(const EC_GROUP *group, const EC_POINT *point,
    point_conversion_form_t form,
    unsigned char *buf, size_t len, BN_CTX *ctx)
{
    size_t ret;
    BN_CTX *new_ctx = NULL;
    int used_ctx = 0;
    BIGNUM *x, *y;
    size_t field_len, i, skip;

    if ((form != POINT_CONVERSION_COMPRESSED)
        && (form != POINT_CONVERSION_UNCOMPRESSED)
        && (form != POINT_CONVERSION_HYBRID)) {
        ERR_raise(ERR_LIB_EC, EC_R_INVALID_FORM);
        goto err;
    }

    if (EC_POINT_is_at_infinity(group, point)) {
        /* encodes to a single 0 octet */
        if (buf != NULL) {
            if (len < 1) {
                ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
                return 0;
            }
            buf[0] = 0;
        }
        return 1;
    }

    /* ret := required output buffer length */
    field_len = BN_num_bytes(group->field);
    ret = (form == POINT_CONVERSION_COMPRESSED) ? 1 + field_len : 1 + 2 * field_len;

    /* if 'buf' is NULL, just return required length */
    if (buf != NULL) {
        if (len < ret) {
            ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
            goto err;
        }

        if (ctx == NULL) {
            ctx = new_ctx = BN_CTX_new_ex(group->libctx);
            if (ctx == NULL)
                return 0;
        }

        BN_CTX_start(ctx);
        used_ctx = 1;
        x = BN_CTX_get(ctx);
        y = BN_CTX_get(ctx);
        if (y == NULL)
            goto err;

        if (!EC_POINT_get_affine_coordinates(group, point, x, y, ctx))
            goto err;

        if ((form == POINT_CONVERSION_COMPRESSED
                || form == POINT_CONVERSION_HYBRID)
            && BN_is_odd(y))
            buf[0] = form + 1;
        else
            buf[0] = form;

        i = 1;

        skip = field_len - BN_num_bytes(x);
        if (skip > field_len) {
            ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR);
            goto err;
        }
        while (skip > 0) {
            buf[i++] = 0;
            skip--;
        }
        skip = BN_bn2bin(x, buf + i);
        i += skip;
        if (i != 1 + field_len) {
            ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR);
            goto err;
        }

        if (form == POINT_CONVERSION_UNCOMPRESSED
            || form == POINT_CONVERSION_HYBRID) {
            skip = field_len - BN_num_bytes(y);
            if (skip > field_len) {
                ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR);
                goto err;
            }
            while (skip > 0) {
                buf[i++] = 0;
                skip--;
            }
            skip = BN_bn2bin(y, buf + i);
            i += skip;
        }

        if (i != ret) {
            ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR);
            goto err;
        }
    }

    if (used_ctx)
        BN_CTX_end(ctx);
    BN_CTX_free(new_ctx);
    return ret;

err:
    if (used_ctx)
        BN_CTX_end(ctx);
    BN_CTX_free(new_ctx);
    return 0;
}

int ossl_ec_GFp_simple_oct2point(const EC_GROUP *group, EC_POINT *point,
    const unsigned char *buf, size_t len,
    BN_CTX *ctx)
{
    point_conversion_form_t form;
    int y_bit;
    BN_CTX *new_ctx = NULL;
    BIGNUM *x, *y;
    size_t field_len, enc_len;
    int ret = 0;

    if (len == 0) {
        ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
        return 0;
    }
    form = buf[0];
    y_bit = form & 1;
    form = form & ~1U;
    if ((form != 0) && (form != POINT_CONVERSION_COMPRESSED)
        && (form != POINT_CONVERSION_UNCOMPRESSED)
        && (form != POINT_CONVERSION_HYBRID)) {
        ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
        return 0;
    }
    if ((form == 0 || form == POINT_CONVERSION_UNCOMPRESSED) && y_bit) {
        ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
        return 0;
    }

    if (form == 0) {
        if (len != 1) {
            ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
            return 0;
        }

        return EC_POINT_set_to_infinity(group, point);
    }

    field_len = BN_num_bytes(group->field);
    enc_len = (form == POINT_CONVERSION_COMPRESSED) ? 1 + field_len : 1 + 2 * field_len;

    if (len != enc_len) {
        ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
        return 0;
    }

    if (ctx == NULL) {
        ctx = new_ctx = BN_CTX_new_ex(group->libctx);
        if (ctx == NULL)
            return 0;
    }

    BN_CTX_start(ctx);
    x = BN_CTX_get(ctx);
    y = BN_CTX_get(ctx);
    if (y == NULL)
        goto err;

    if (!BN_bin2bn(buf + 1, field_len, x))
        goto err;
    if (BN_ucmp(x, group->field) >= 0) {
        ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
        goto err;
    }

    if (form == POINT_CONVERSION_COMPRESSED) {
        if (!EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx))
            goto err;
    } else {
        if (!BN_bin2bn(buf + 1 + field_len, field_len, y))
            goto err;
        if (BN_ucmp(y, group->field) >= 0) {
            ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
            goto err;
        }
        if (form == POINT_CONVERSION_HYBRID) {
            if (y_bit != BN_is_odd(y)) {
                ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
                goto err;
            }
        }

        /*
         * EC_POINT_set_affine_coordinates is responsible for checking that
         * the point is on the curve.
         */
        if (!EC_POINT_set_affine_coordinates(group, point, x, y, ctx))
            goto err;
    }

    ret = 1;

err:
    BN_CTX_end(ctx);
    BN_CTX_free(new_ctx);
    return ret;
}

Coverage Report

Created: 2026-07-23 06:28

Line	Count	Source
1		/*
2		* Copyright 2011-2021 The OpenSSL Project Authors. All Rights Reserved.
3		* Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
4		*
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
9		*/
10
11		/*
12		* ECDSA low level APIs are deprecated for public use, but still ok for
13		* internal use.
14		*/
15		#include "internal/deprecated.h"
16
17		#include <openssl/err.h>
18		#include <openssl/symhacks.h>
19
20		#include "ec_local.h"
21
22		int ossl_ec_GFp_simple_set_compressed_coordinates(const EC_GROUP *group,
23		EC_POINT *point,
24		const BIGNUM *x_, int y_bit,
25		BN_CTX *ctx)
26	203k	{
27	203k	BN_CTX *new_ctx = NULL;
28	203k	BIGNUM tmp1, tmp2, x, y;
29	203k	int ret = 0;
30
31	203k	if (ctx == NULL) {
32	0	ctx = new_ctx = BN_CTX_new_ex(group->libctx);
33	0	if (ctx == NULL)
34	0	return 0;
35	0	}
36
37	203k	y_bit = (y_bit != 0);
38
39	203k	BN_CTX_start(ctx);
40	203k	tmp1 = BN_CTX_get(ctx);
41	203k	tmp2 = BN_CTX_get(ctx);
42	203k	x = BN_CTX_get(ctx);
43	203k	y = BN_CTX_get(ctx);
44	203k	if (y == NULL)
45	0	goto err;
46
47		/*-
48		* Recover y. We have a Weierstrass equation
49		* y^2 = x^3 + a*x + b,
50		* so y is one of the square roots of x^3 + a*x + b.
51		*/
52
53		/* tmp1 := x^3 */
54	203k	if (!BN_nnmod(x, x_, group->field, ctx))
55	0	goto err;
56	203k	if (group->meth->field_decode == 0) {
57		/* field_{sqr,mul} work on standard representation */
58	86.3k	if (!group->meth->field_sqr(group, tmp2, x_, ctx))
59	0	goto err;
60	86.3k	if (!group->meth->field_mul(group, tmp1, tmp2, x_, ctx))
61	0	goto err;
62	117k	} else {
63	117k	if (!BN_mod_sqr(tmp2, x_, group->field, ctx))
64	0	goto err;
65	117k	if (!BN_mod_mul(tmp1, tmp2, x_, group->field, ctx))
66	0	goto err;
67	117k	}
68
69		/* tmp1 := tmp1 + ax /
70	203k	if (group->a_is_minus3) {
71	145k	if (!BN_mod_lshift1_quick(tmp2, x, group->field))
72	0	goto err;
73	145k	if (!BN_mod_add_quick(tmp2, tmp2, x, group->field))
74	0	goto err;
75	145k	if (!BN_mod_sub_quick(tmp1, tmp1, tmp2, group->field))
76	0	goto err;
77	145k	} else {
78	58.5k	if (group->meth->field_decode) {
79	58.5k	if (!group->meth->field_decode(group, tmp2, group->a, ctx))
80	0	goto err;
81	58.5k	if (!BN_mod_mul(tmp2, tmp2, x, group->field, ctx))
82	0	goto err;
83	58.5k	} else {
84		/* field_mul works on standard representation */
85	0	if (!group->meth->field_mul(group, tmp2, group->a, x, ctx))
86	0	goto err;
87	0	}
88
89	58.5k	if (!BN_mod_add_quick(tmp1, tmp1, tmp2, group->field))
90	0	goto err;
91	58.5k	}
92
93		/* tmp1 := tmp1 + b */
94	203k	if (group->meth->field_decode) {
95	117k	if (!group->meth->field_decode(group, tmp2, group->b, ctx))
96	0	goto err;
97	117k	if (!BN_mod_add_quick(tmp1, tmp1, tmp2, group->field))
98	0	goto err;
99	117k	} else {
100	86.3k	if (!BN_mod_add_quick(tmp1, tmp1, group->b, group->field))
101	0	goto err;
102	86.3k	}
103
104	203k	ERR_set_mark();
105	203k	if (!BN_mod_sqrt(y, tmp1, group->field, ctx)) {
106	69.5k	#ifndef FIPS_MODULE
107	69.5k	unsigned long err = ERR_peek_last_error();
108
109	69.5k	if (ERR_GET_LIB(err) == ERR_LIB_BN
110	69.5k	&& ERR_GET_REASON(err) == BN_R_NOT_A_SQUARE) {
111	68.7k	ERR_pop_to_mark();
112	68.7k	ERR_raise(ERR_LIB_EC, EC_R_INVALID_COMPRESSED_POINT);
113	68.7k	} else
114	742	#endif
115	742	{
116	742	ERR_clear_last_mark();
117	742	ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
118	742	}
119	69.5k	goto err;
120	69.5k	}
121	134k	ERR_clear_last_mark();
122
123	134k	if (y_bit != BN_is_odd(y)) {
124	67.9k	if (BN_is_zero(y)) {
125	190	int kron;
126
127	190	kron = BN_kronecker(x, group->field, ctx);
128	190	if (kron == -2)
129	0	goto err;
130
131	190	if (kron == 1)
132	190	ERR_raise(ERR_LIB_EC, EC_R_INVALID_COMPRESSION_BIT);
133	190	else
134		/*
135		* BN_mod_sqrt() should have caught this error (not a square)
136		*/
137	190	ERR_raise(ERR_LIB_EC, EC_R_INVALID_COMPRESSED_POINT);
138	190	goto err;
139	190	}
140	67.7k	if (!BN_usub(y, group->field, y))
141	0	goto err;
142	67.7k	}
143	134k	if (y_bit != BN_is_odd(y)) {
144	0	ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR);
145	0	goto err;
146	0	}
147
148	134k	if (!EC_POINT_set_affine_coordinates(group, point, x, y, ctx))
149	0	goto err;
150
151	134k	ret = 1;
152
153	203k	err:
154	203k	BN_CTX_end(ctx);
155	203k	BN_CTX_free(new_ctx);
156	203k	return ret;
157	134k	}
158
159		size_t ossl_ec_GFp_simple_point2oct(const EC_GROUP group, const EC_POINT point,
160		point_conversion_form_t form,
161		unsigned char buf, size_t len, BN_CTX ctx)
162	216k	{
163	216k	size_t ret;
164	216k	BN_CTX *new_ctx = NULL;
165	216k	int used_ctx = 0;
166	216k	BIGNUM x, y;
167	216k	size_t field_len, i, skip;
168
169	216k	if ((form != POINT_CONVERSION_COMPRESSED)
170	199k	&& (form != POINT_CONVERSION_UNCOMPRESSED)
171	627	&& (form != POINT_CONVERSION_HYBRID)) {
172	321	ERR_raise(ERR_LIB_EC, EC_R_INVALID_FORM);
173	321	goto err;
174	321	}
175
176	216k	if (EC_POINT_is_at_infinity(group, point)) {
177		/* encodes to a single 0 octet */
178	1.42k	if (buf != NULL) {
179	712	if (len < 1) {
180	0	ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
181	0	return 0;
182	0	}
183	712	buf[0] = 0;
184	712	}
185	1.42k	return 1;
186	1.42k	}
187
188		/* ret := required output buffer length */
189	215k	field_len = BN_num_bytes(group->field);
190	215k	ret = (form == POINT_CONVERSION_COMPRESSED) ? 1 + field_len : 1 + 2 * field_len;
191
192		/* if 'buf' is NULL, just return required length */
193	215k	if (buf != NULL) {
194	107k	if (len < ret) {
195	0	ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
196	0	goto err;
197	0	}
198
199	107k	if (ctx == NULL) {
200	13.0k	ctx = new_ctx = BN_CTX_new_ex(group->libctx);
201	13.0k	if (ctx == NULL)
202	0	return 0;
203	13.0k	}
204
205	107k	BN_CTX_start(ctx);
206	107k	used_ctx = 1;
207	107k	x = BN_CTX_get(ctx);
208	107k	y = BN_CTX_get(ctx);
209	107k	if (y == NULL)
210	0	goto err;
211
212	107k	if (!EC_POINT_get_affine_coordinates(group, point, x, y, ctx))
213	0	goto err;
214
215	107k	if ((form == POINT_CONVERSION_COMPRESSED
216	98.6k	\|\| form == POINT_CONVERSION_HYBRID)
217	9.05k	&& BN_is_odd(y))
218	3.61k	buf[0] = form + 1;
219	103k	else
220	103k	buf[0] = form;
221
222	107k	i = 1;
223
224	107k	skip = field_len - BN_num_bytes(x);
225	107k	if (skip > field_len) {
226	0	ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR);
227	0	goto err;
228	0	}
229	182k	while (skip > 0) {
230	74.8k	buf[i++] = 0;
231	74.8k	skip--;
232	74.8k	}
233	107k	skip = BN_bn2bin(x, buf + i);
234	107k	i += skip;
235	107k	if (i != 1 + field_len) {
236	0	ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR);
237	0	goto err;
238	0	}
239
240	107k	if (form == POINT_CONVERSION_UNCOMPRESSED
241	98.6k	\|\| form == POINT_CONVERSION_HYBRID) {
242	98.6k	skip = field_len - BN_num_bytes(y);
243	98.6k	if (skip > field_len) {
244	0	ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR);
245	0	goto err;
246	0	}
247	108k	while (skip > 0) {
248	10.3k	buf[i++] = 0;
249	10.3k	skip--;
250	10.3k	}
251	98.6k	skip = BN_bn2bin(y, buf + i);
252	98.6k	i += skip;
253	98.6k	}
254
255	107k	if (i != ret) {
256	0	ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR);
257	0	goto err;
258	0	}
259	107k	}
260
261	215k	if (used_ctx)
262	107k	BN_CTX_end(ctx);
263	215k	BN_CTX_free(new_ctx);
264	215k	return ret;
265
266	321	err:
267	321	if (used_ctx)
268	0	BN_CTX_end(ctx);
269	321	BN_CTX_free(new_ctx);
270	321	return 0;
271	215k	}
272
273		int ossl_ec_GFp_simple_oct2point(const EC_GROUP group, EC_POINT point,
274		const unsigned char *buf, size_t len,
275		BN_CTX *ctx)
276	496k	{
277	496k	point_conversion_form_t form;
278	496k	int y_bit;
279	496k	BN_CTX *new_ctx = NULL;
280	496k	BIGNUM x, y;
281	496k	size_t field_len, enc_len;
282	496k	int ret = 0;
283
284	496k	if (len == 0) {
285	30.8k	ERR_raise(ERR_LIB_EC, EC_R_BUFFER_TOO_SMALL);
286	30.8k	return 0;
287	30.8k	}
288	465k	form = buf[0];
289	465k	y_bit = form & 1;
290	465k	form = form & ~1U;
291	465k	if ((form != 0) && (form != POINT_CONVERSION_COMPRESSED)
292	228k	&& (form != POINT_CONVERSION_UNCOMPRESSED)
293	21.2k	&& (form != POINT_CONVERSION_HYBRID)) {
294	7.94k	ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
295	7.94k	return 0;
296	7.94k	}
297	457k	if ((form == 0 \|\| form == POINT_CONVERSION_UNCOMPRESSED) && y_bit) {
298	5.01k	ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
299	5.01k	return 0;
300	5.01k	}
301
302	452k	if (form == 0) {
303	19.2k	if (len != 1) {
304	6.38k	ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
305	6.38k	return 0;
306	6.38k	}
307
308	12.8k	return EC_POINT_set_to_infinity(group, point);
309	19.2k	}
310
311	433k	field_len = BN_num_bytes(group->field);
312	433k	enc_len = (form == POINT_CONVERSION_COMPRESSED) ? 1 + field_len : 1 + 2 * field_len;
313
314	433k	if (len != enc_len) {
315	9.58k	ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
316	9.58k	return 0;
317	9.58k	}
318
319	423k	if (ctx == NULL) {
320	333k	ctx = new_ctx = BN_CTX_new_ex(group->libctx);
321	333k	if (ctx == NULL)
322	0	return 0;
323	333k	}
324
325	423k	BN_CTX_start(ctx);
326	423k	x = BN_CTX_get(ctx);
327	423k	y = BN_CTX_get(ctx);
328	423k	if (y == NULL)
329	0	goto err;
330
331	423k	if (!BN_bin2bn(buf + 1, field_len, x))
332	0	goto err;
333	423k	if (BN_ucmp(x, group->field) >= 0) {
334	5.39k	ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
335	5.39k	goto err;
336	5.39k	}
337
338	418k	if (form == POINT_CONVERSION_COMPRESSED) {
339	203k	if (!EC_POINT_set_compressed_coordinates(group, point, x, y_bit, ctx))
340	69.6k	goto err;
341	214k	} else {
342	214k	if (!BN_bin2bn(buf + 1 + field_len, field_len, y))
343	0	goto err;
344	214k	if (BN_ucmp(y, group->field) >= 0) {
345	639	ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
346	639	goto err;
347	639	}
348	213k	if (form == POINT_CONVERSION_HYBRID) {
349	8.74k	if (y_bit != BN_is_odd(y)) {
350	1.30k	ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
351	1.30k	goto err;
352	1.30k	}
353	8.74k	}
354
355		/*
356		* EC_POINT_set_affine_coordinates is responsible for checking that
357		* the point is on the curve.
358		*/
359	212k	if (!EC_POINT_set_affine_coordinates(group, point, x, y, ctx))
360	22.6k	goto err;
361	212k	}
362
363	323k	ret = 1;
364
365	423k	err:
366	423k	BN_CTX_end(ctx);
367	423k	BN_CTX_free(new_ctx);
368	423k	return ret;
369	323k	}