-/* crypto/evp/digest.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
#include "internal/cryptlib.h"
#include <openssl/objects.h>
#include <openssl/evp.h>
-#ifndef OPENSSL_NO_ENGINE
-# include <openssl/engine.h>
-#endif
+#include <openssl/engine.h>
+#include "internal/evp_int.h"
+#include "evp_locl.h"
-void EVP_MD_CTX_init(EVP_MD_CTX *ctx)
+/* This call frees resources associated with the context */
+int EVP_MD_CTX_reset(EVP_MD_CTX *ctx)
{
+ if (ctx == NULL)
+ return 1;
+
+ /*
+ * 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)) {
+ OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
+ }
+ EVP_PKEY_CTX_free(ctx->pctx);
+#ifndef OPENSSL_NO_ENGINE
+ ENGINE_finish(ctx->engine);
+#endif
memset(ctx, 0, sizeof(*ctx));
+
+ return 1;
}
-EVP_MD_CTX *EVP_MD_CTX_create(void)
+EVP_MD_CTX *EVP_MD_CTX_new(void)
{
- EVP_MD_CTX *ctx = OPENSSL_malloc(sizeof(*ctx));
-
- if (ctx)
- EVP_MD_CTX_init(ctx);
+ return OPENSSL_zalloc(sizeof(EVP_MD_CTX));
+}
- return ctx;
+void EVP_MD_CTX_free(EVP_MD_CTX *ctx)
+{
+ EVP_MD_CTX_reset(ctx);
+ OPENSSL_free(ctx);
}
int EVP_DigestInit(EVP_MD_CTX *ctx, const EVP_MD *type)
{
- EVP_MD_CTX_init(ctx);
+ EVP_MD_CTX_reset(ctx);
return EVP_DigestInit_ex(ctx, type, NULL);
}
* 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.
+ * reinitialisation, when it may all be unnecessary.
*/
if (ctx->engine && ctx->digest && (!type ||
(type
* previous check attempted to avoid this if the same ENGINE and
* EVP_MD could be used).
*/
- if (ctx->engine)
- ENGINE_finish(ctx->engine);
- if (impl) {
+ ENGINE_finish(ctx->engine);
+ if (impl != NULL) {
if (!ENGINE_init(impl)) {
EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
return 0;
}
- } else
+ } else {
/* Ask if an ENGINE is reserved for this job */
impl = ENGINE_get_digest_engine(type->type);
- if (impl) {
+ }
+ if (impl != NULL) {
/* There's an ENGINE for this job ... (apparently) */
const EVP_MD *d = ENGINE_get_digest(impl, type->type);
- if (!d) {
- /* Same comment from evp_enc.c */
+
+ if (d == NULL) {
EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_INITIALIZATION_ERROR);
ENGINE_finish(impl);
return 0;
}
#endif
if (ctx->digest != type) {
- if (ctx->digest && ctx->digest->ctx_size)
+ if (ctx->digest && ctx->digest->ctx_size) {
OPENSSL_free(ctx->md_data);
+ 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 = OPENSSL_malloc(type->ctx_size);
+ ctx->md_data = OPENSSL_zalloc(type->ctx_size);
if (ctx->md_data == NULL) {
EVPerr(EVP_F_EVP_DIGESTINIT_EX, ERR_R_MALLOC_FAILURE);
return 0;
{
int ret;
ret = EVP_DigestFinal_ex(ctx, md, size);
- EVP_MD_CTX_cleanup(ctx);
+ EVP_MD_CTX_reset(ctx);
return ret;
}
int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
{
- EVP_MD_CTX_init(out);
+ EVP_MD_CTX_reset(out);
return EVP_MD_CTX_copy_ex(out, in);
}
EVP_MD_CTX_set_flags(out, EVP_MD_CTX_FLAG_REUSE);
} else
tmp_buf = NULL;
- EVP_MD_CTX_cleanup(out);
+ EVP_MD_CTX_reset(out);
memcpy(out, in, sizeof(*out));
+ /* 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
+ */
+ out->md_data = NULL;
+ out->pctx = NULL;
+
if (in->md_data && out->digest->ctx_size) {
if (tmp_buf)
out->md_data = tmp_buf;
else {
out->md_data = OPENSSL_malloc(out->digest->ctx_size);
- if (!out->md_data) {
+ if (out->md_data == NULL) {
EVPerr(EVP_F_EVP_MD_CTX_COPY_EX, ERR_R_MALLOC_FAILURE);
return 0;
}
if (in->pctx) {
out->pctx = EVP_PKEY_CTX_dup(in->pctx);
if (!out->pctx) {
- EVP_MD_CTX_cleanup(out);
+ EVP_MD_CTX_reset(out);
return 0;
}
}
unsigned char *md, unsigned int *size, const EVP_MD *type,
ENGINE *impl)
{
- EVP_MD_CTX ctx;
+ EVP_MD_CTX *ctx = EVP_MD_CTX_new();
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);
+ if (ctx == NULL)
+ return 0;
+ 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_free(ctx);
return ret;
}
-void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx)
-{
- if (ctx) {
- EVP_MD_CTX_cleanup(ctx);
- OPENSSL_free(ctx);
- }
-}
-
-/* This call frees resources associated with the context */
-int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
+int EVP_MD_CTX_ctrl(EVP_MD_CTX *ctx, int cmd, int p1, void *p2)
{
- /*
- * 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)) {
- OPENSSL_clear_free(ctx->md_data, ctx->digest->ctx_size);
+ if (ctx->digest && ctx->digest->md_ctrl) {
+ int ret = ctx->digest->md_ctrl(ctx, cmd, p1, p2);
+ if (ret <= 0)
+ return 0;
+ return 1;
}
- EVP_PKEY_CTX_free(ctx->pctx);
-#ifndef OPENSSL_NO_ENGINE
- if (ctx->engine)
- /*
- * The EVP_MD we used belongs to an ENGINE, release the functional
- * reference we held for this reason.
- */
- ENGINE_finish(ctx->engine);
-#endif
- memset(ctx, 0, sizeof(*ctx));
-
- return 1;
+ return 0;
}
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