/*
- * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
- * Licensed under the OpenSSL license (the "License"). You may not use
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
#include <openssl/evp.h>
#include <openssl/engine.h>
#include "internal/evp_int.h"
+#include "internal/provider.h"
#include "evp_locl.h"
/* This call frees resources associated with the context */
if (ctx == NULL)
return 1;
+ if (ctx->digest == NULL || ctx->digest->prov == NULL)
+ goto legacy;
+
+ if (ctx->provctx != NULL) {
+ if (ctx->digest->freectx != NULL)
+ ctx->digest->freectx(ctx->provctx);
+ ctx->provctx = NULL;
+ EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
+ }
+
+ if (ctx->pctx != NULL)
+ goto legacy;
+
+ return 1;
+
+ /* TODO(3.0): Remove legacy code below */
+ legacy:
+
/*
* Don't assume ctx->md_data was cleaned in EVP_Digest_Final, because
* sometimes only copies of the context are ever finalised.
&& !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE)) {
OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
}
- EVP_PKEY_CTX_free(ctx->pctx);
+ /*
+ * pctx should be freed by the user of EVP_MD_CTX
+ * if EVP_MD_CTX_FLAG_KEEP_PKEY_CTX is set
+ */
+ 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
void EVP_MD_CTX_free(EVP_MD_CTX *ctx)
{
+ if (ctx == NULL)
+ return;
+
+ if (ctx->digest == NULL || ctx->digest->prov == NULL)
+ goto legacy;
+
+ EVP_MD_CTX_reset(ctx);
+
+ EVP_MD_meth_free(ctx->fetched_digest);
+ ctx->fetched_digest = NULL;
+ ctx->digest = NULL;
+ ctx->reqdigest = NULL;
+
+ OPENSSL_free(ctx);
+ return;
+
+ /* TODO(3.0): Remove legacy code below */
+ legacy:
EVP_MD_CTX_reset(ctx);
OPENSSL_free(ctx);
}
int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl)
{
+ EVP_MD *provmd;
+ ENGINE *tmpimpl = NULL;
+
EVP_MD_CTX_clear_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
+
+ if (type != NULL)
+ ctx->reqdigest = type;
+
+ /* TODO(3.0): Legacy work around code below. Remove this */
#ifndef OPENSSL_NO_ENGINE
/*
* Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
if (ctx->engine && ctx->digest &&
(type == NULL || (type->type == ctx->digest->type)))
goto skip_to_init;
+
+ if (type != NULL && impl == NULL)
+ tmpimpl = ENGINE_get_digest_engine(type->type);
+#endif
+
+ /*
+ * If there are engines involved or if we're being used as part of
+ * EVP_DigestSignInit then we should use legacy handling for now.
+ */
+ if (ctx->engine != NULL
+ || impl != NULL
+ || tmpimpl != NULL
+ || ctx->pctx != NULL
+ || (ctx->flags & EVP_MD_CTX_FLAG_NO_INIT) != 0) {
+ if (ctx->digest == ctx->fetched_digest)
+ ctx->digest = NULL;
+ EVP_MD_meth_free(ctx->fetched_digest);
+ ctx->fetched_digest = NULL;
+ goto legacy;
+ }
+
+ if (type->prov == NULL) {
+ switch(type->type) {
+ case NID_sha256:
+ break;
+ default:
+ goto legacy;
+ }
+ }
+
+ if (ctx->digest != NULL && ctx->digest->ctx_size > 0) {
+ OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
+ ctx->md_data = NULL;
+ }
+
+ /* TODO(3.0): Start of non-legacy code below */
+
+ if (type->prov == NULL) {
+ provmd = EVP_MD_fetch(NULL, OBJ_nid2sn(type->type), "");
+ if (provmd == NULL) {
+ EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
+ return 0;
+ }
+ type = provmd;
+ EVP_MD_meth_free(ctx->fetched_digest);
+ ctx->fetched_digest = provmd;
+ }
+
+ ctx->digest = type;
+ if (ctx->provctx == NULL) {
+ ctx->provctx = ctx->digest->newctx();
+ if (ctx->provctx == NULL) {
+ EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
+ return 0;
+ }
+ }
+
+ if (ctx->digest->dinit == NULL) {
+ EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
+ return 0;
+ }
+
+ return ctx->digest->dinit(ctx->provctx);
+
+ /* TODO(3.0): Remove legacy code below */
+ legacy:
+
+#ifndef OPENSSL_NO_ENGINE
if (type) {
/*
* Ensure an ENGINE left lying around from last time is cleared (the
}
} else {
/* Ask if an ENGINE is reserved for this job */
- impl = ENGINE_get_digest_engine(type->type);
+ impl = tmpimpl;
}
if (impl != NULL) {
/* There's an ENGINE for this job ... (apparently) */
int EVP_DigestUpdate(EVP_MD_CTX *ctx, const void *data, size_t count)
{
+ if (count == 0)
+ return 1;
+
+ if (ctx->digest == NULL || ctx->digest->prov == NULL)
+ goto legacy;
+
+ if (ctx->digest->dupdate == NULL) {
+ EVPerr(EVP_F_EVP_DIGESTUPDATE, EVP_R_UPDATE_ERROR);
+ return 0;
+ }
+ return ctx->digest->dupdate(ctx->provctx, data, count);
+
+ /* TODO(3.0): Remove legacy code below */
+ legacy:
return ctx->update(ctx, data, count);
}
}
/* 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 EVP_DigestFinal_ex(EVP_MD_CTX *ctx, unsigned char *md, unsigned int *isize)
{
int ret;
+ size_t size = 0;
+
+ if (ctx->digest == NULL || ctx->digest->prov == NULL)
+ goto legacy;
+
+ if (ctx->digest->dfinal == NULL) {
+ EVPerr(EVP_F_EVP_DIGESTFINAL_EX, EVP_R_FINAL_ERROR);
+ return 0;
+ }
+
+ ret = ctx->digest->dfinal(ctx->provctx, md, &size);
+ if (isize != NULL) {
+ if (size <= UINT_MAX) {
+ *isize = (int)size;
+ } else {
+ EVPerr(EVP_F_EVP_DIGESTFINAL_EX, EVP_R_FINAL_ERROR);
+ ret = 0;
+ }
+ }
+
+ EVP_MD_CTX_reset(ctx);
+
+ return ret;
+
+ /* TODO(3.0): Remove legacy code below */
+ legacy:
OPENSSL_assert(ctx->digest->md_size <= EVP_MAX_MD_SIZE);
ret = ctx->digest->final(ctx, md);
- if (size != NULL)
- *size = ctx->digest->md_size;
+ if (isize != NULL)
+ *isize = ctx->digest->md_size;
if (ctx->digest->cleanup) {
ctx->digest->cleanup(ctx);
EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
return ret;
}
+int EVP_DigestFinalXOF(EVP_MD_CTX *ctx, unsigned char *md, size_t size)
+{
+ int ret = 0;
+
+ if (ctx->digest->flags & EVP_MD_FLAG_XOF
+ && size <= INT_MAX
+ && ctx->digest->md_ctrl(ctx, EVP_MD_CTRL_XOF_LEN, (int)size, NULL)) {
+ ret = ctx->digest->final(ctx, md);
+
+ if (ctx->digest->cleanup != NULL) {
+ ctx->digest->cleanup(ctx);
+ EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_CLEANED);
+ }
+ OPENSSL_cleanse(ctx->md_data, ctx->digest->ctx_size);
+ } else {
+ EVPerr(EVP_F_EVP_DIGESTFINALXOF, EVP_R_NOT_XOF_OR_INVALID_LENGTH);
+ }
+
+ return ret;
+}
+
int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
{
EVP_MD_CTX_reset(out);
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)) {
+
+ if (in == NULL || in->digest == NULL) {
EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_INPUT_NOT_INITIALIZED);
return 0;
}
+
+ if (in->digest->prov == NULL)
+ goto legacy;
+
+ if (in->digest->dupctx == NULL) {
+ EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_NOT_ABLE_TO_COPY_CTX);
+ return 0;
+ }
+
+ EVP_MD_CTX_reset(out);
+ if (out->fetched_digest != NULL)
+ EVP_MD_meth_free(out->fetched_digest);
+ *out = *in;
+ /* NULL out pointers in case of error */
+ out->pctx = NULL;
+ out->provctx = NULL;
+
+ if (in->fetched_digest != NULL)
+ EVP_MD_upref(in->fetched_digest);
+
+ out->provctx = in->digest->dupctx(in->provctx);
+ if (out->provctx == NULL) {
+ EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_NOT_ABLE_TO_COPY_CTX);
+ return 0;
+ }
+
+ /* copied EVP_MD_CTX should free the copied EVP_PKEY_CTX */
+ EVP_MD_CTX_clear_flags(out, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
+ if (in->pctx != NULL) {
+ out->pctx = EVP_PKEY_CTX_dup(in->pctx);
+ if (out->pctx == NULL) {
+ EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, EVP_R_NOT_ABLE_TO_COPY_CTX);
+ EVP_MD_CTX_reset(out);
+ return 0;
+ }
+ }
+
+ return 1;
+
+ /* TODO(3.0): Remove legacy code below */
+ legacy:
#ifndef OPENSSL_NO_ENGINE
/* Make sure it's safe to copy a digest context using an ENGINE */
if (in->engine && !ENGINE_init(in->engine)) {
EVP_MD_CTX_reset(out);
memcpy(out, in, sizeof(*out));
+ /* copied EVP_MD_CTX should free the copied EVP_PKEY_CTX */
+ EVP_MD_CTX_clear_flags(out, EVP_MD_CTX_FLAG_KEEP_PKEY_CTX);
+
/* Null these variables, since they are getting fixed up
* properly below. Anything else may cause a memleak and/or
* double free if any of the memory allocations below fail
}
return 0;
}
+
+static void *evp_md_from_dispatch(int mdtype, const OSSL_DISPATCH *fns,
+ OSSL_PROVIDER *prov)
+{
+ EVP_MD *md = NULL;
+ int fncnt = 0;
+
+ if ((md = EVP_MD_meth_new(mdtype, NID_undef)) == NULL)
+ return NULL;
+
+ for (; fns->function_id != 0; fns++) {
+ switch (fns->function_id) {
+ case OSSL_FUNC_DIGEST_NEWCTX:
+ if (md->newctx != NULL)
+ break;
+ md->newctx = OSSL_get_OP_digest_newctx(fns);
+ fncnt++;
+ break;
+ case OSSL_FUNC_DIGEST_INIT:
+ if (md->dinit != NULL)
+ break;
+ md->dinit = OSSL_get_OP_digest_init(fns);
+ fncnt++;
+ break;
+ case OSSL_FUNC_DIGEST_UPDDATE:
+ if (md->dupdate != NULL)
+ break;
+ md->dupdate = OSSL_get_OP_digest_update(fns);
+ fncnt++;
+ break;
+ case OSSL_FUNC_DIGEST_FINAL:
+ if (md->dfinal != NULL)
+ break;
+ md->dfinal = OSSL_get_OP_digest_final(fns);
+ fncnt++;
+ break;
+ case OSSL_FUNC_DIGEST_DIGEST:
+ if (md->digest != NULL)
+ break;
+ md->digest = OSSL_get_OP_digest_digest(fns);
+ /* We don't increment fnct for this as it is stand alone */
+ break;
+ case OSSL_FUNC_DIGEST_FREECTX:
+ if (md->freectx != NULL)
+ break;
+ md->freectx = OSSL_get_OP_digest_freectx(fns);
+ fncnt++;
+ break;
+ case OSSL_FUNC_DIGEST_DUPCTX:
+ if (md->dupctx != NULL)
+ break;
+ md->dupctx = OSSL_get_OP_digest_dupctx(fns);
+ break;
+ case OSSL_FUNC_DIGEST_SIZE:
+ if (md->size != NULL)
+ break;
+ md->size = OSSL_get_OP_digest_size(fns);
+ break;
+ }
+ }
+ if ((fncnt != 0 && fncnt != 5)
+ || (fncnt == 0 && md->digest == NULL)
+ || md->size == NULL) {
+ /*
+ * In order to be a consistent set of functions we either need the
+ * whole set of init/update/final etc functions or none of them.
+ * The "digest" function can standalone. We at least need one way to
+ * generate digests.
+ */
+ EVP_MD_meth_free(md);
+ return NULL;
+ }
+ md->prov = prov;
+ if (prov != NULL)
+ ossl_provider_upref(prov);
+
+ return md;
+}
+
+static int evp_md_upref(void *md)
+{
+ return EVP_MD_upref(md);
+}
+
+static void evp_md_free(void *md)
+{
+ EVP_MD_meth_free(md);
+}
+
+EVP_MD *EVP_MD_fetch(OPENSSL_CTX *ctx, const char *algorithm,
+ const char *properties)
+{
+ return evp_generic_fetch(ctx, OSSL_OP_DIGEST, algorithm, properties,
+ evp_md_from_dispatch, evp_md_upref,
+ evp_md_free);
+}
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