| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved. |
| 3 | * |
| 4 | * Licensed under the OpenSSL license (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 <openssl/crypto.h> |
| 11 | #include <openssl/err.h> |
| 12 | #include "ec_local.h" |
| 13 | |
| 14 | BIGNUM *EC_POINT_point2bn(const EC_GROUP *group, |
| 15 | const EC_POINT *point, |
| 16 | point_conversion_form_t form, |
| 17 | BIGNUM *ret, BN_CTX *ctx) |
| 18 | { |
| 19 | size_t buf_len = 0; |
| 20 | unsigned char *buf; |
| 21 | |
| 22 | buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx); |
| 23 | |
| 24 | if (buf_len == 0) |
| 25 | return NULL; |
| 26 | |
| 27 | ret = BN_bin2bn(buf, buf_len, ret); |
| 28 | |
| 29 | OPENSSL_free(buf); |
| 30 | |
| 31 | return ret; |
| 32 | } |
| 33 | |
| 34 | EC_POINT *EC_POINT_bn2point(const EC_GROUP *group, |
| 35 | const BIGNUM *bn, EC_POINT *point, BN_CTX *ctx) |
| 36 | { |
| 37 | size_t buf_len = 0; |
| 38 | unsigned char *buf; |
| 39 | EC_POINT *ret; |
| 40 | |
| 41 | if ((buf_len = BN_num_bytes(bn)) == 0) |
| 42 | buf_len = 1; |
| 43 | if ((buf = OPENSSL_malloc(buf_len)) == NULL) { |
| 44 | ECerr(EC_F_EC_POINT_BN2POINT, ERR_R_MALLOC_FAILURE); |
| 45 | return NULL; |
| 46 | } |
| 47 | |
| 48 | if (!BN_bn2binpad(bn, buf, buf_len)) { |
| 49 | OPENSSL_free(buf); |
| 50 | return NULL; |
| 51 | } |
| 52 | |
| 53 | if (point == NULL) { |
| 54 | if ((ret = EC_POINT_new(group)) == NULL) { |
| 55 | OPENSSL_free(buf); |
| 56 | return NULL; |
| 57 | } |
| 58 | } else |
| 59 | ret = point; |
| 60 | |
| 61 | if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) { |
| 62 | if (ret != point) |
| 63 | EC_POINT_clear_free(ret); |
| 64 | OPENSSL_free(buf); |
| 65 | return NULL; |
| 66 | } |
| 67 | |
| 68 | OPENSSL_free(buf); |
| 69 | return ret; |
| 70 | } |
| 71 | |
| 72 | static const char *HEX_DIGITS = "0123456789ABCDEF"; |
| 73 | |
| 74 | /* the return value must be freed (using OPENSSL_free()) */ |
| 75 | char *EC_POINT_point2hex(const EC_GROUP *group, |
| 76 | const EC_POINT *point, |
| 77 | point_conversion_form_t form, BN_CTX *ctx) |
| 78 | { |
| 79 | char *ret, *p; |
| 80 | size_t buf_len = 0, i; |
| 81 | unsigned char *buf = NULL, *pbuf; |
| 82 | |
| 83 | buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx); |
| 84 | |
| 85 | if (buf_len == 0) |
| 86 | return NULL; |
| 87 | |
| 88 | ret = OPENSSL_malloc(buf_len * 2 + 2); |
| 89 | if (ret == NULL) { |
| 90 | OPENSSL_free(buf); |
| 91 | return NULL; |
| 92 | } |
| 93 | p = ret; |
| 94 | pbuf = buf; |
| 95 | for (i = buf_len; i > 0; i--) { |
| 96 | int v = (int)*(pbuf++); |
| 97 | *(p++) = HEX_DIGITS[v >> 4]; |
| 98 | *(p++) = HEX_DIGITS[v & 0x0F]; |
| 99 | } |
| 100 | *p = '\0'; |
| 101 | |
| 102 | OPENSSL_free(buf); |
| 103 | |
| 104 | return ret; |
| 105 | } |
| 106 | |
| 107 | EC_POINT *EC_POINT_hex2point(const EC_GROUP *group, |
| 108 | const char *buf, EC_POINT *point, BN_CTX *ctx) |
| 109 | { |
| 110 | EC_POINT *ret = NULL; |
| 111 | BIGNUM *tmp_bn = NULL; |
| 112 | |
| 113 | if (!BN_hex2bn(&tmp_bn, buf)) |
| 114 | return NULL; |
| 115 | |
| 116 | ret = EC_POINT_bn2point(group, tmp_bn, point, ctx); |
| 117 | |
| 118 | BN_clear_free(tmp_bn); |
| 119 | |
| 120 | return ret; |
| 121 | } |