/* $OpenBSD: digest.c,v 1.34 2022/01/10 10:51:31 tb Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * 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 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 acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS 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 AUTHOR OR 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. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ /* ==================================================================== * Copyright (c) 1998-2001 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 * openssl-core@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 <stdio.h> #include <string.h> #include <openssl/opensslconf.h> #include <openssl/err.h> #include <openssl/evp.h> #include <openssl/objects.h> #ifndef OPENSSL_NO_ENGINE #include <openssl/engine.h> #endif #include "evp_locl.h" int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type) { EVP_MD_CTX_init(ctx); return EVP_DigestInit_ex(ctx, type, NULL); } int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) { EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); #ifndef OPENSSL_NO_ENGINE /* Whether it's nice or not, "Inits" can be used on "Final"'d contexts * so this context may already have an ENGINE! Try to avoid releasing * the previous handle, re-querying for an ENGINE, and having a * reinitialisation, when it may all be unecessary. */ if (ctx->engine && ctx->digest && (!type || (type && (type->type == ctx->digest->type)))) goto skip_to_init; if (type) { /* Ensure an ENGINE left lying around from last time is cleared * (the previous check attempted to avoid this if the same * ENGINE and EVP_MD could be used). */ ENGINE_finish(ctx->engine); if (impl != NULL) { if (!ENGINE_init(impl)) { EVPerror(EVP_R_INITIALIZATION_ERROR); return 0; } } else /* Ask if an ENGINE is reserved for this job */ impl = ENGINE_get_digest_engine(type->type); if (impl != NULL) { /* There's an ENGINE for this job ... (apparently) */ const EVP_MD *d = ENGINE_get_digest(impl, type->type); if (d == NULL) { /* Same comment from evp_enc.c */ EVPerror(EVP_R_INITIALIZATION_ERROR); ENGINE_finish(impl); return 0; } /* We'll use the ENGINE's private digest definition */ type = d; /* Store the ENGINE functional reference so we know * 'type' came from an ENGINE and we need to release * it when done. */ ctx->engine = impl; } else ctx->engine = NULL; } else if (!ctx->digest) { EVPerror(EVP_R_NO_DIGEST_SET); return 0; } #endif if (ctx->digest != type) { if (ctx->digest && ctx->digest->ctx_size && ctx->md_data && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) { freezero(ctx->md_data, ctx->digest->ctx_size); ctx->md_data = NULL; } ctx->digest = type; if (!(ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) && type->ctx_size) { ctx->update = type->update; ctx->md_data = calloc(1, type->ctx_size); if (ctx->md_data == NULL) { EVP_PKEY_CTX_free(ctx->pctx); ctx->pctx = NULL; EVPerror(ERR_R_MALLOC_FAILURE); return 0; } } } #ifndef OPENSSL_NO_ENGINE skip_to_init: #endif if (ctx->pctx) { int r; r = EVP_PKEY_CTX_ctrl(ctx->pctx, -1, EVP_PKEY_OP_TYPE_SIG, EVP_PKEY_CTRL_DIGESTINIT, 0, ctx); if (r <= 0 && (r != -2)) return 0; } if (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) return 1; return ctx->digest->init(ctx); } int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count) { return ctx->update(ctx, data, count); } /* The caller can assume that this removes any secret data from the context */ int EVP_DigestFinal(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) { int ret; ret = EVP_DigestFinal_ex(ctx, md, size); EVP_MD_CTX_cleanup(ctx); return ret; } /* The caller can assume that this removes any secret data from the context */ int EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *size) { int ret; if ((size_t)ctx->digest->md_size > EVP_MAX_MD_SIZE) { EVPerror(EVP_R_TOO_LARGE); return 0; } ret = ctx->digest->final(ctx, md); if (size != NULL) *size = ctx->digest->md_size; if (ctx->digest->cleanup) { ctx->digest->cleanup(ctx); EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED); } memset(ctx->md_data, 0, ctx->digest->ctx_size); return ret; } int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in) { EVP_MD_CTX_init(out); return EVP_MD_CTX_copy_ex(out, in); } int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in) { unsigned char *tmp_buf; if ((in == NULL) || (in->digest == NULL)) { EVPerror(EVP_R_INPUT_NOT_INITIALIZED); return 0; } #ifndef OPENSSL_NO_ENGINE /* Make sure it's safe to copy a digest context using an ENGINE */ if (in->engine && !ENGINE_init(in->engine)) { EVPerror(ERR_R_ENGINE_LIB); return 0; } #endif if (out->digest == in->digest) { tmp_buf = out->md_data; EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE); } else tmp_buf = NULL; EVP_MD_CTX_cleanup(out); memcpy(out, in, sizeof *out); out->md_data = NULL; out->pctx = NULL; /* * Because of the EVP_PKEY_CTX_dup() below, EVP_MD_CTX_cleanup() needs * to free out->pctx in all cases (even if this flag is set on in). */ EVP_MD_CTX_clear_flags(out, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX); if (in->md_data && out->digest->ctx_size) { if (tmp_buf) { out->md_data = tmp_buf; } else { out->md_data = calloc(1, out->digest->ctx_size); if (out->md_data == NULL) { EVPerror(ERR_R_MALLOC_FAILURE); return 0; } } memcpy(out->md_data, in->md_data, out->digest->ctx_size); } out->update = in->update; if (in->pctx) { out->pctx = EVP_PKEY_CTX_dup(in->pctx); if (!out->pctx) { EVP_MD_CTX_cleanup(out); return 0; } } if (out->digest->copy) return out->digest->copy(out, in); return 1; } int EVP_Digest(const void *data, size_t count, unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl) { EVP_MD_CTX ctx; int ret; EVP_MD_CTX_init(&ctx); EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_ONESHOT); ret = EVP_DigestInit_ex(&ctx, type, impl) && EVP_DigestUpdate(&ctx, data, count) && EVP_DigestFinal_ex(&ctx, md, size); EVP_MD_CTX_cleanup(&ctx); return ret; } EVP_MD_CTX * EVP_MD_CTX_new(void) { return calloc(1, sizeof(EVP_MD_CTX)); } void EVP_MD_CTX_free(EVP_MD_CTX *ctx) { if (ctx == NULL) return; EVP_MD_CTX_cleanup(ctx); free(ctx); } void EVP_MD_CTX_init(EVP_MD_CTX *ctx) { memset(ctx, 0, sizeof(*ctx)); } int EVP_MD_CTX_reset(EVP_MD_CTX *ctx) { return EVP_MD_CTX_cleanup(ctx); } EVP_MD_CTX * EVP_MD_CTX_create(void) { return EVP_MD_CTX_new(); } void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx) { EVP_MD_CTX_free(ctx); } /* This call frees resources associated with the context */ int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx) { /* * Don't assume ctx->md_data was cleaned in EVP_Digest_Final, * because sometimes only copies of the context are ever finalised. */ if (ctx->digest && ctx->digest->cleanup && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_CLEANED)) ctx->digest->cleanup(ctx); if (ctx->digest && ctx->digest->ctx_size && ctx->md_data && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) freezero(ctx->md_data, ctx->digest->ctx_size); /* * If EVP_MD_CTX_FLAG_KEEP_PKEY_CTX is set, EVP_MD_CTX_set_pkey() was * called and its strange API contract implies we don't own ctx->pctx. */ if (!EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX)) EVP_PKEY_CTX_free(ctx->pctx); #ifndef OPENSSL_NO_ENGINE ENGINE_finish(ctx->engine); #endif memset(ctx, 0, sizeof(*ctx)); return 1; } int EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr) { int ret; if (!ctx->digest) { EVPerror(EVP_R_NO_CIPHER_SET); return 0; } if (!ctx->digest->md_ctrl) { EVPerror(EVP_R_CTRL_NOT_IMPLEMENTED); return 0; } ret = ctx->digest->md_ctrl(ctx, type, arg, ptr); if (ret == -1) { EVPerror(EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED); return 0; } return ret; }
