| 1 | /*
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| 2 | * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/crypto.h>
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| 11 | #include <openssl/err.h>
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| 12 | #include "ec_local.h"
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| 13 |
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| 14 | BIGNUM *EC_POINT_point2bn(const EC_GROUP *group,
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| 15 | const EC_POINT *point,
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| 16 | point_conversion_form_t form,
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| 17 | BIGNUM *ret, BN_CTX *ctx)
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| 18 | {
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| 19 | size_t buf_len = 0;
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| 20 | unsigned char *buf;
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| 21 |
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| 22 | buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx);
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| 23 |
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| 24 | if (buf_len == 0)
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| 25 | return NULL;
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| 26 |
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| 27 | ret = BN_bin2bn(buf, buf_len, ret);
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| 28 |
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| 29 | OPENSSL_free(buf);
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| 30 |
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| 31 | return ret;
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| 32 | }
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| 33 |
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| 34 | EC_POINT *EC_POINT_bn2point(const EC_GROUP *group,
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| 35 | const BIGNUM *bn, EC_POINT *point, BN_CTX *ctx)
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| 36 | {
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| 37 | size_t buf_len = 0;
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| 38 | unsigned char *buf;
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| 39 | EC_POINT *ret;
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| 40 |
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| 41 | if ((buf_len = BN_num_bytes(bn)) == 0)
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| 42 | buf_len = 1;
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| 43 | if ((buf = OPENSSL_malloc(buf_len)) == NULL) {
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| 44 | ECerr(EC_F_EC_POINT_BN2POINT, ERR_R_MALLOC_FAILURE);
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| 45 | return NULL;
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| 46 | }
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| 47 |
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| 48 | if (!BN_bn2binpad(bn, buf, buf_len)) {
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| 49 | OPENSSL_free(buf);
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| 50 | return NULL;
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| 51 | }
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| 52 |
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| 53 | if (point == NULL) {
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| 54 | if ((ret = EC_POINT_new(group)) == NULL) {
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| 55 | OPENSSL_free(buf);
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| 56 | return NULL;
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| 57 | }
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| 58 | } else
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| 59 | ret = point;
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| 60 |
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| 61 | if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) {
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| 62 | if (ret != point)
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| 63 | EC_POINT_clear_free(ret);
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| 64 | OPENSSL_free(buf);
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| 65 | return NULL;
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| 66 | }
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| 67 |
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| 68 | OPENSSL_free(buf);
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| 69 | return ret;
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| 70 | }
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| 71 |
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| 72 | static const char *HEX_DIGITS = "0123456789ABCDEF";
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| 73 |
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| 74 | /* the return value must be freed (using OPENSSL_free()) */
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| 75 | char *EC_POINT_point2hex(const EC_GROUP *group,
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| 76 | const EC_POINT *point,
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| 77 | point_conversion_form_t form, BN_CTX *ctx)
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| 78 | {
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| 79 | char *ret, *p;
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| 80 | size_t buf_len = 0, i;
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| 81 | unsigned char *buf = NULL, *pbuf;
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| 82 |
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| 83 | buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx);
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| 84 |
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| 85 | if (buf_len == 0)
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| 86 | return NULL;
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| 87 |
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| 88 | ret = OPENSSL_malloc(buf_len * 2 + 2);
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| 89 | if (ret == NULL) {
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| 90 | OPENSSL_free(buf);
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| 91 | return NULL;
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| 92 | }
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| 93 | p = ret;
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| 94 | pbuf = buf;
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| 95 | for (i = buf_len; i > 0; i--) {
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| 96 | int v = (int)*(pbuf++);
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| 97 | *(p++) = HEX_DIGITS[v >> 4];
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| 98 | *(p++) = HEX_DIGITS[v & 0x0F];
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| 99 | }
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| 100 | *p = '\0';
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| 101 |
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| 102 | OPENSSL_free(buf);
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| 103 |
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| 104 | return ret;
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| 105 | }
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| 106 |
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| 107 | EC_POINT *EC_POINT_hex2point(const EC_GROUP *group,
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| 108 | const char *buf, EC_POINT *point, BN_CTX *ctx)
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| 109 | {
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| 110 | EC_POINT *ret = NULL;
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| 111 | BIGNUM *tmp_bn = NULL;
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| 112 |
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| 113 | if (!BN_hex2bn(&tmp_bn, buf))
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| 114 | return NULL;
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| 115 |
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| 116 | ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);
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| 117 |
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| 118 | BN_clear_free(tmp_bn);
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| 119 |
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| 120 | return ret;
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| 121 | }
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