mirror of
https://github.com/openssl/openssl.git
synced 2024-11-27 05:21:51 +08:00
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
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* Copyright 2002-2024 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 <string.h> /* strlen */
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#include <openssl/crypto.h>
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#include "internal/cryptlib.h"
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#include "ec_local.h"
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/* the return value must be freed (using OPENSSL_free()) */
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char *EC_POINT_point2hex(const EC_GROUP *group,
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const EC_POINT *point,
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point_conversion_form_t form, BN_CTX *ctx)
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{
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char *ret, *p;
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size_t buf_len, i;
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unsigned char *buf = NULL;
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buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx);
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if (buf_len == 0)
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return NULL;
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ret = OPENSSL_malloc(buf_len * 2 + 2);
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if (ret == NULL)
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goto err;
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p = ret;
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for (i = 0; i < buf_len; ++i)
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p += ossl_to_hex(p, buf[i]);
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*p = '\0';
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err:
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OPENSSL_free(buf);
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return ret;
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}
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EC_POINT *EC_POINT_hex2point(const EC_GROUP *group,
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const char *hex, EC_POINT *point, BN_CTX *ctx)
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{
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int ok = 0;
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unsigned char *oct_buf = NULL;
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size_t len, oct_buf_len = 0;
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EC_POINT *pt = NULL;
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if (group == NULL || hex == NULL)
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return NULL;
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if (point == NULL) {
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pt = EC_POINT_new(group);
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if (pt == NULL)
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goto err;
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} else {
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pt = point;
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}
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len = strlen(hex) / 2;
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oct_buf = OPENSSL_malloc(len);
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if (oct_buf == NULL)
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goto err;
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if (!OPENSSL_hexstr2buf_ex(oct_buf, len, &oct_buf_len, hex, '\0')
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|| !EC_POINT_oct2point(group, pt, oct_buf, oct_buf_len, ctx))
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goto err;
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ok = 1;
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err:
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OPENSSL_clear_free(oct_buf, oct_buf_len);
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if (!ok) {
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if (pt != point)
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EC_POINT_clear_free(pt);
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pt = NULL;
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}
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return pt;
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}
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