Imported Upstream version 4.8.0.309

Former-commit-id: 5f9c6ae75f295e057a7d2971f3a6df4656fa8850

external/boringssl/crypto/evp/sign.c

@@ -0,0 +1,151 @@
+/* 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.] */
+
+#include <openssl/evp.h>
+
+#include <openssl/digest.h>
+#include <openssl/err.h>
+
+#include "internal.h"
+
+
+int EVP_SignInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) {
+  return EVP_DigestInit_ex(ctx, type, impl);
+}
+
+int EVP_SignInit(EVP_MD_CTX *ctx, const EVP_MD *type) {
+  return EVP_DigestInit(ctx, type);
+}
+
+int EVP_SignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
+  return EVP_DigestUpdate(ctx, data, len);
+}
+
+int EVP_SignFinal(const EVP_MD_CTX *ctx, uint8_t *sig,
+                  unsigned int *out_sig_len, EVP_PKEY *pkey) {
+  uint8_t m[EVP_MAX_MD_SIZE];
+  unsigned int m_len;
+  int ret = 0;
+  EVP_MD_CTX tmp_ctx;
+  EVP_PKEY_CTX *pkctx = NULL;
+  size_t sig_len = EVP_PKEY_size(pkey);
+
+  *out_sig_len = 0;
+  EVP_MD_CTX_init(&tmp_ctx);
+  if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) ||
+      !EVP_DigestFinal_ex(&tmp_ctx, m, &m_len)) {
+    goto out;
+  }
+  EVP_MD_CTX_cleanup(&tmp_ctx);
+
+  pkctx = EVP_PKEY_CTX_new(pkey, NULL);
+  if (!pkctx || !EVP_PKEY_sign_init(pkctx) ||
+      !EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest) ||
+      !EVP_PKEY_sign(pkctx, sig, &sig_len, m, m_len)) {
+    goto out;
+  }
+  *out_sig_len = sig_len;
+  ret = 1;
+
+out:
+  if (pkctx) {
+    EVP_PKEY_CTX_free(pkctx);
+  }
+
+  return ret;
+}
+
+int EVP_VerifyInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl) {
+  return EVP_DigestInit_ex(ctx, type, impl);
+}
+
+int EVP_VerifyInit(EVP_MD_CTX *ctx, const EVP_MD *type) {
+  return EVP_DigestInit(ctx, type);
+}
+
+int EVP_VerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) {
+  return EVP_DigestUpdate(ctx, data, len);
+}
+
+int EVP_VerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig, size_t sig_len,
+                    EVP_PKEY *pkey) {
+  uint8_t m[EVP_MAX_MD_SIZE];
+  unsigned int m_len;
+  int ret = 0;
+  EVP_MD_CTX tmp_ctx;
+  EVP_PKEY_CTX *pkctx = NULL;
+
+  EVP_MD_CTX_init(&tmp_ctx);
+  if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) ||
+      !EVP_DigestFinal_ex(&tmp_ctx, m, &m_len)) {
+    EVP_MD_CTX_cleanup(&tmp_ctx);
+    goto out;
+  }
+  EVP_MD_CTX_cleanup(&tmp_ctx);
+
+  pkctx = EVP_PKEY_CTX_new(pkey, NULL);
+  if (!pkctx ||
+      !EVP_PKEY_verify_init(pkctx) ||
+      !EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest)) {
+    goto out;
+  }
+  ret = EVP_PKEY_verify(pkctx, sig, sig_len, m, m_len);
+
+out:
+  EVP_PKEY_CTX_free(pkctx);
+  return ret;
+}
+