[331] | 1 | /*
|
---|
| 2 | * Copyright 1995-2016 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 <stdio.h>
|
---|
| 11 | #include <stdlib.h>
|
---|
| 12 | #include <string.h>
|
---|
| 13 | #include "internal/cryptlib.h"
|
---|
| 14 | #include <openssl/hmac.h>
|
---|
| 15 | #include <openssl/opensslconf.h>
|
---|
| 16 | #include "hmac_lcl.h"
|
---|
| 17 |
|
---|
| 18 | int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
|
---|
| 19 | const EVP_MD *md, ENGINE *impl)
|
---|
| 20 | {
|
---|
| 21 | int i, j, reset = 0;
|
---|
| 22 | unsigned char pad[HMAC_MAX_MD_CBLOCK];
|
---|
| 23 |
|
---|
| 24 | /* If we are changing MD then we must have a key */
|
---|
| 25 | if (md != NULL && md != ctx->md && (key == NULL || len < 0))
|
---|
| 26 | return 0;
|
---|
| 27 |
|
---|
| 28 | if (md != NULL) {
|
---|
| 29 | reset = 1;
|
---|
| 30 | ctx->md = md;
|
---|
| 31 | } else if (ctx->md) {
|
---|
| 32 | md = ctx->md;
|
---|
| 33 | } else {
|
---|
| 34 | return 0;
|
---|
| 35 | }
|
---|
| 36 |
|
---|
| 37 | if (key != NULL) {
|
---|
| 38 | reset = 1;
|
---|
| 39 | j = EVP_MD_block_size(md);
|
---|
| 40 | OPENSSL_assert(j <= (int)sizeof(ctx->key));
|
---|
| 41 | if (j < len) {
|
---|
| 42 | if (!EVP_DigestInit_ex(ctx->md_ctx, md, impl))
|
---|
| 43 | goto err;
|
---|
| 44 | if (!EVP_DigestUpdate(ctx->md_ctx, key, len))
|
---|
| 45 | goto err;
|
---|
| 46 | if (!EVP_DigestFinal_ex(ctx->md_ctx, ctx->key,
|
---|
| 47 | &ctx->key_length))
|
---|
| 48 | goto err;
|
---|
| 49 | } else {
|
---|
| 50 | if (len < 0 || len > (int)sizeof(ctx->key))
|
---|
| 51 | return 0;
|
---|
| 52 | memcpy(ctx->key, key, len);
|
---|
| 53 | ctx->key_length = len;
|
---|
| 54 | }
|
---|
| 55 | if (ctx->key_length != HMAC_MAX_MD_CBLOCK)
|
---|
| 56 | memset(&ctx->key[ctx->key_length], 0,
|
---|
| 57 | HMAC_MAX_MD_CBLOCK - ctx->key_length);
|
---|
| 58 | }
|
---|
| 59 |
|
---|
| 60 | if (reset) {
|
---|
| 61 | for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
|
---|
| 62 | pad[i] = 0x36 ^ ctx->key[i];
|
---|
| 63 | if (!EVP_DigestInit_ex(ctx->i_ctx, md, impl))
|
---|
| 64 | goto err;
|
---|
| 65 | if (!EVP_DigestUpdate(ctx->i_ctx, pad, EVP_MD_block_size(md)))
|
---|
| 66 | goto err;
|
---|
| 67 |
|
---|
| 68 | for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++)
|
---|
| 69 | pad[i] = 0x5c ^ ctx->key[i];
|
---|
| 70 | if (!EVP_DigestInit_ex(ctx->o_ctx, md, impl))
|
---|
| 71 | goto err;
|
---|
| 72 | if (!EVP_DigestUpdate(ctx->o_ctx, pad, EVP_MD_block_size(md)))
|
---|
| 73 | goto err;
|
---|
| 74 | }
|
---|
| 75 | if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->i_ctx))
|
---|
| 76 | goto err;
|
---|
| 77 | return 1;
|
---|
| 78 | err:
|
---|
| 79 | return 0;
|
---|
| 80 | }
|
---|
| 81 |
|
---|
| 82 | #if OPENSSL_API_COMPAT < 0x10100000L
|
---|
| 83 | int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md)
|
---|
| 84 | {
|
---|
| 85 | if (key && md)
|
---|
| 86 | HMAC_CTX_reset(ctx);
|
---|
| 87 | return HMAC_Init_ex(ctx, key, len, md, NULL);
|
---|
| 88 | }
|
---|
| 89 | #endif
|
---|
| 90 |
|
---|
| 91 | int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)
|
---|
| 92 | {
|
---|
| 93 | if (!ctx->md)
|
---|
| 94 | return 0;
|
---|
| 95 | return EVP_DigestUpdate(ctx->md_ctx, data, len);
|
---|
| 96 | }
|
---|
| 97 |
|
---|
| 98 | int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
|
---|
| 99 | {
|
---|
| 100 | unsigned int i;
|
---|
| 101 | unsigned char buf[EVP_MAX_MD_SIZE];
|
---|
| 102 |
|
---|
| 103 | if (!ctx->md)
|
---|
| 104 | goto err;
|
---|
| 105 |
|
---|
| 106 | if (!EVP_DigestFinal_ex(ctx->md_ctx, buf, &i))
|
---|
| 107 | goto err;
|
---|
| 108 | if (!EVP_MD_CTX_copy_ex(ctx->md_ctx, ctx->o_ctx))
|
---|
| 109 | goto err;
|
---|
| 110 | if (!EVP_DigestUpdate(ctx->md_ctx, buf, i))
|
---|
| 111 | goto err;
|
---|
| 112 | if (!EVP_DigestFinal_ex(ctx->md_ctx, md, len))
|
---|
| 113 | goto err;
|
---|
| 114 | return 1;
|
---|
| 115 | err:
|
---|
| 116 | return 0;
|
---|
| 117 | }
|
---|
| 118 |
|
---|
| 119 | size_t HMAC_size(const HMAC_CTX *ctx)
|
---|
| 120 | {
|
---|
| 121 | return EVP_MD_size((ctx)->md);
|
---|
| 122 | }
|
---|
| 123 |
|
---|
| 124 | HMAC_CTX *HMAC_CTX_new(void)
|
---|
| 125 | {
|
---|
| 126 | HMAC_CTX *ctx = OPENSSL_zalloc(sizeof(HMAC_CTX));
|
---|
| 127 |
|
---|
| 128 | if (ctx != NULL) {
|
---|
| 129 | if (!HMAC_CTX_reset(ctx)) {
|
---|
| 130 | HMAC_CTX_free(ctx);
|
---|
| 131 | return NULL;
|
---|
| 132 | }
|
---|
| 133 | }
|
---|
| 134 | return ctx;
|
---|
| 135 | }
|
---|
| 136 |
|
---|
| 137 | static void hmac_ctx_cleanup(HMAC_CTX *ctx)
|
---|
| 138 | {
|
---|
| 139 | EVP_MD_CTX_reset(ctx->i_ctx);
|
---|
| 140 | EVP_MD_CTX_reset(ctx->o_ctx);
|
---|
| 141 | EVP_MD_CTX_reset(ctx->md_ctx);
|
---|
| 142 | ctx->md = NULL;
|
---|
| 143 | ctx->key_length = 0;
|
---|
| 144 | OPENSSL_cleanse(ctx->key, sizeof(ctx->key));
|
---|
| 145 | }
|
---|
| 146 |
|
---|
| 147 | void HMAC_CTX_free(HMAC_CTX *ctx)
|
---|
| 148 | {
|
---|
| 149 | if (ctx != NULL) {
|
---|
| 150 | hmac_ctx_cleanup(ctx);
|
---|
| 151 | EVP_MD_CTX_free(ctx->i_ctx);
|
---|
| 152 | EVP_MD_CTX_free(ctx->o_ctx);
|
---|
| 153 | EVP_MD_CTX_free(ctx->md_ctx);
|
---|
| 154 | OPENSSL_free(ctx);
|
---|
| 155 | }
|
---|
| 156 | }
|
---|
| 157 |
|
---|
| 158 | int HMAC_CTX_reset(HMAC_CTX *ctx)
|
---|
| 159 | {
|
---|
| 160 | hmac_ctx_cleanup(ctx);
|
---|
| 161 | if (ctx->i_ctx == NULL)
|
---|
| 162 | ctx->i_ctx = EVP_MD_CTX_new();
|
---|
| 163 | if (ctx->i_ctx == NULL)
|
---|
| 164 | goto err;
|
---|
| 165 | if (ctx->o_ctx == NULL)
|
---|
| 166 | ctx->o_ctx = EVP_MD_CTX_new();
|
---|
| 167 | if (ctx->o_ctx == NULL)
|
---|
| 168 | goto err;
|
---|
| 169 | if (ctx->md_ctx == NULL)
|
---|
| 170 | ctx->md_ctx = EVP_MD_CTX_new();
|
---|
| 171 | if (ctx->md_ctx == NULL)
|
---|
| 172 | goto err;
|
---|
| 173 | ctx->md = NULL;
|
---|
| 174 | return 1;
|
---|
| 175 | err:
|
---|
| 176 | hmac_ctx_cleanup(ctx);
|
---|
| 177 | return 0;
|
---|
| 178 | }
|
---|
| 179 |
|
---|
| 180 | int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
|
---|
| 181 | {
|
---|
| 182 | if (!HMAC_CTX_reset(dctx))
|
---|
| 183 | goto err;
|
---|
| 184 | if (!EVP_MD_CTX_copy_ex(dctx->i_ctx, sctx->i_ctx))
|
---|
| 185 | goto err;
|
---|
| 186 | if (!EVP_MD_CTX_copy_ex(dctx->o_ctx, sctx->o_ctx))
|
---|
| 187 | goto err;
|
---|
| 188 | if (!EVP_MD_CTX_copy_ex(dctx->md_ctx, sctx->md_ctx))
|
---|
| 189 | goto err;
|
---|
| 190 | memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK);
|
---|
| 191 | dctx->key_length = sctx->key_length;
|
---|
| 192 | dctx->md = sctx->md;
|
---|
| 193 | return 1;
|
---|
| 194 | err:
|
---|
| 195 | hmac_ctx_cleanup(dctx);
|
---|
| 196 | return 0;
|
---|
| 197 | }
|
---|
| 198 |
|
---|
| 199 | unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
|
---|
| 200 | const unsigned char *d, size_t n, unsigned char *md,
|
---|
| 201 | unsigned int *md_len)
|
---|
| 202 | {
|
---|
| 203 | HMAC_CTX *c = NULL;
|
---|
| 204 | static unsigned char m[EVP_MAX_MD_SIZE];
|
---|
| 205 | static const unsigned char dummy_key[1] = {'\0'};
|
---|
| 206 |
|
---|
| 207 | if (md == NULL)
|
---|
| 208 | md = m;
|
---|
| 209 | if ((c = HMAC_CTX_new()) == NULL)
|
---|
| 210 | goto err;
|
---|
| 211 |
|
---|
| 212 | /* For HMAC_Init_ex, NULL key signals reuse. */
|
---|
| 213 | if (key == NULL && key_len == 0) {
|
---|
| 214 | key = dummy_key;
|
---|
| 215 | }
|
---|
| 216 |
|
---|
| 217 | if (!HMAC_Init_ex(c, key, key_len, evp_md, NULL))
|
---|
| 218 | goto err;
|
---|
| 219 | if (!HMAC_Update(c, d, n))
|
---|
| 220 | goto err;
|
---|
| 221 | if (!HMAC_Final(c, md, md_len))
|
---|
| 222 | goto err;
|
---|
| 223 | HMAC_CTX_free(c);
|
---|
| 224 | return md;
|
---|
| 225 | err:
|
---|
| 226 | HMAC_CTX_free(c);
|
---|
| 227 | return NULL;
|
---|
| 228 | }
|
---|
| 229 |
|
---|
| 230 | void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
|
---|
| 231 | {
|
---|
| 232 | EVP_MD_CTX_set_flags(ctx->i_ctx, flags);
|
---|
| 233 | EVP_MD_CTX_set_flags(ctx->o_ctx, flags);
|
---|
| 234 | EVP_MD_CTX_set_flags(ctx->md_ctx, flags);
|
---|
| 235 | }
|
---|
| 236 |
|
---|
| 237 | const EVP_MD *HMAC_CTX_get_md(const HMAC_CTX *ctx)
|
---|
| 238 | {
|
---|
| 239 | return ctx->md;
|
---|
| 240 | }
|
---|