+{
+ 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).
+ */
+ if (ctx->engine)
+ ENGINE_finish(ctx->engine);
+ if (impl) {
+ if (!ENGINE_init(impl)) {
+ EVPerr(EVP_F_EVP_DIGESTINIT_EX, 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) {
+ /* 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 */
+ EVPerr(EVP_F_EVP_DIGESTINIT_EX, 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) {
+ EVPerr(EVP_F_EVP_DIGESTINIT_EX, EVP_R_NO_DIGEST_SET);
+ return 0;
+ }
+ type = ctx->digest;
+ }
+#endif
+ if (ctx->digest != type) {
+ if (ctx->digest && ctx->digest->ctx_size)
+ OPENSSL_free(ctx->md_data);
+ 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);
+ if (ctx->md_data == NULL) {
+ EVPerr(EVP_F_EVP_DIGESTINIT_EX, 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);
+}