| /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| * project 2007. |
| */ |
| /* ==================================================================== |
| * Copyright (c) 2007 The OpenSSL Project. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. All advertising materials mentioning features or use of this |
| * software must display the following acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| * |
| * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| * endorse or promote products derived from this software without |
| * prior written permission. For written permission, please contact |
| * licensing@OpenSSL.org. |
| * |
| * 5. Products derived from this software may not be called "OpenSSL" |
| * nor may "OpenSSL" appear in their names without prior written |
| * permission of the OpenSSL Project. |
| * |
| * 6. Redistributions of any form whatsoever must retain the following |
| * acknowledgment: |
| * "This product includes software developed by the OpenSSL Project |
| * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| * OF THE POSSIBILITY OF SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This product includes cryptographic software written by Eric Young |
| * (eay@cryptsoft.com). This product includes software written by Tim |
| * Hudson (tjh@cryptsoft.com). */ |
| |
| #include <openssl/evp.h> |
| |
| #include <string.h> |
| |
| #include <openssl/asn1.h> |
| #include <openssl/err.h> |
| #include <openssl/hmac.h> |
| #include <openssl/mem.h> |
| #include <openssl/obj.h> |
| |
| #include "internal.h" |
| |
| |
| typedef struct { |
| const EVP_MD *md; /* MD for HMAC use */ |
| ASN1_OCTET_STRING ktmp; /* Temp storage for key */ |
| HMAC_CTX ctx; |
| } HMAC_PKEY_CTX; |
| |
| static int pkey_hmac_init(EVP_PKEY_CTX *ctx) { |
| HMAC_PKEY_CTX *hctx; |
| hctx = OPENSSL_malloc(sizeof(HMAC_PKEY_CTX)); |
| if (!hctx) { |
| return 0; |
| } |
| memset(hctx, 0, sizeof(HMAC_PKEY_CTX)); |
| hctx->ktmp.type = V_ASN1_OCTET_STRING; |
| HMAC_CTX_init(&hctx->ctx); |
| |
| ctx->data = hctx; |
| |
| return 1; |
| } |
| |
| static int pkey_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) { |
| HMAC_PKEY_CTX *sctx, *dctx; |
| if (!pkey_hmac_init(dst)) { |
| return 0; |
| } |
| sctx = src->data; |
| dctx = dst->data; |
| dctx->md = sctx->md; |
| HMAC_CTX_init(&dctx->ctx); |
| if (!HMAC_CTX_copy_ex(&dctx->ctx, &sctx->ctx)) { |
| return 0; |
| } |
| if (sctx->ktmp.data) { |
| if (!ASN1_OCTET_STRING_set(&dctx->ktmp, sctx->ktmp.data, |
| sctx->ktmp.length)) { |
| return 0; |
| } |
| } |
| return 1; |
| } |
| |
| static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx) { |
| HMAC_PKEY_CTX *hctx = ctx->data; |
| |
| if (hctx == NULL) { |
| return; |
| } |
| |
| HMAC_CTX_cleanup(&hctx->ctx); |
| if (hctx->ktmp.data) { |
| if (hctx->ktmp.length) { |
| OPENSSL_cleanse(hctx->ktmp.data, hctx->ktmp.length); |
| } |
| OPENSSL_free(hctx->ktmp.data); |
| hctx->ktmp.data = NULL; |
| } |
| OPENSSL_free(hctx); |
| } |
| |
| static int pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) { |
| ASN1_OCTET_STRING *hkey = NULL; |
| HMAC_PKEY_CTX *hctx = ctx->data; |
| |
| if (!hctx->ktmp.data) { |
| return 0; |
| } |
| hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp); |
| if (!hkey) { |
| return 0; |
| } |
| EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey); |
| |
| return 1; |
| } |
| |
| static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count) { |
| HMAC_PKEY_CTX *hctx = ctx->pctx->data; |
| return HMAC_Update(&hctx->ctx, data, count); |
| } |
| |
| static int hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx) { |
| HMAC_PKEY_CTX *hctx = ctx->data; |
| |
| HMAC_CTX_set_flags(&hctx->ctx, mctx->flags & ~EVP_MD_CTX_FLAG_NO_INIT); |
| EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT); |
| mctx->update = int_update; |
| return 1; |
| } |
| |
| static int hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, |
| EVP_MD_CTX *mctx) { |
| unsigned int hlen; |
| HMAC_PKEY_CTX *hctx = ctx->data; |
| size_t md_size = EVP_MD_CTX_size(mctx); |
| |
| if (!sig) { |
| *siglen = md_size; |
| return 1; |
| } else if (*siglen < md_size) { |
| OPENSSL_PUT_ERROR(EVP, hmac_signctx, EVP_R_BUFFER_TOO_SMALL); |
| return 0; |
| } |
| |
| if (!HMAC_Final(&hctx->ctx, sig, &hlen)) { |
| return 0; |
| } |
| *siglen = (size_t)hlen; |
| return 1; |
| } |
| |
| static int pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) { |
| HMAC_PKEY_CTX *hctx = ctx->data; |
| ASN1_OCTET_STRING *key; |
| |
| switch (type) { |
| case EVP_PKEY_CTRL_SET_MAC_KEY: |
| if ((!p2 && p1 > 0) || (p1 < -1)) { |
| return 0; |
| } |
| if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1)) { |
| return 0; |
| } |
| break; |
| |
| case EVP_PKEY_CTRL_MD: |
| hctx->md = p2; |
| break; |
| |
| case EVP_PKEY_CTRL_DIGESTINIT: |
| key = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr; |
| if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md, |
| ctx->engine)) { |
| return 0; |
| } |
| break; |
| |
| default: |
| OPENSSL_PUT_ERROR(EVP, pkey_hmac_ctrl, EVP_R_COMMAND_NOT_SUPPORTED); |
| return 0; |
| } |
| return 1; |
| } |
| |
| const EVP_PKEY_METHOD hmac_pkey_meth = { |
| EVP_PKEY_HMAC, 0 /* flags */, pkey_hmac_init, |
| pkey_hmac_copy, pkey_hmac_cleanup, 0 /* paramgen_init */, |
| 0 /* paramgen */, 0 /* keygen_init */, pkey_hmac_keygen, |
| 0 /* sign_init */, 0 /* sign */, 0 /* verify_init */, |
| 0 /* verify */, hmac_signctx_init, hmac_signctx, |
| 0 /* verifyctx_init */, 0 /* verifyctx */, 0 /* encrypt_init */, |
| 0 /* encrypt */, 0 /* decrypt_init */, 0 /* decrypt */, |
| 0 /* derive_init */, 0 /* derive */, pkey_hmac_ctrl, |
| 0, |
| }; |