Imported Upstream version 4.8.0.309

Former-commit-id: 5f9c6ae75f295e057a7d2971f3a6df4656fa8850

external/boringssl/crypto/evp/p_ec.c

@@ -0,0 +1,236 @@
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
+ * project 2006.
+ */
+/* ====================================================================
+ * Copyright (c) 2006 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
+ *    licensing@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 <openssl/evp.h>
+
+#include <string.h>
+
+#include <openssl/bn.h>
+#include <openssl/buf.h>
+#include <openssl/digest.h>
+#include <openssl/ec.h>
+#include <openssl/ec_key.h>
+#include <openssl/ecdh.h>
+#include <openssl/ecdsa.h>
+#include <openssl/err.h>
+#include <openssl/mem.h>
+#include <openssl/nid.h>
+
+#include "internal.h"
+#include "../ec/internal.h"
+
+
+typedef struct {
+  /* message digest */
+  const EVP_MD *md;
+} EC_PKEY_CTX;
+
+
+static int pkey_ec_init(EVP_PKEY_CTX *ctx) {
+  EC_PKEY_CTX *dctx;
+  dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX));
+  if (!dctx) {
+    return 0;
+  }
+  memset(dctx, 0, sizeof(EC_PKEY_CTX));
+
+  ctx->data = dctx;
+
+  return 1;
+}
+
+static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) {
+  EC_PKEY_CTX *dctx, *sctx;
+  if (!pkey_ec_init(dst)) {
+    return 0;
+  }
+  sctx = src->data;
+  dctx = dst->data;
+
+  dctx->md = sctx->md;
+
+  return 1;
+}
+
+static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx) {
+  EC_PKEY_CTX *dctx = ctx->data;
+  if (!dctx) {
+    return;
+  }
+
+  OPENSSL_free(dctx);
+}
+
+static int pkey_ec_sign(EVP_PKEY_CTX *ctx, uint8_t *sig, size_t *siglen,
+                        const uint8_t *tbs, size_t tbslen) {
+  unsigned int sltmp;
+  EC_KEY *ec = ctx->pkey->pkey.ec;
+
+  if (!sig) {
+    *siglen = ECDSA_size(ec);
+    return 1;
+  } else if (*siglen < (size_t)ECDSA_size(ec)) {
+    OPENSSL_PUT_ERROR(EVP, EVP_R_BUFFER_TOO_SMALL);
+    return 0;
+  }
+
+  if (!ECDSA_sign(0, tbs, tbslen, sig, &sltmp, ec)) {
+    return 0;
+  }
+  *siglen = (size_t)sltmp;
+  return 1;
+}
+
+static int pkey_ec_verify(EVP_PKEY_CTX *ctx, const uint8_t *sig, size_t siglen,
+                          const uint8_t *tbs, size_t tbslen) {
+  return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->pkey->pkey.ec);
+}
+
+static int pkey_ec_derive(EVP_PKEY_CTX *ctx, uint8_t *key,
+                          size_t *keylen) {
+  int ret;
+  size_t outlen;
+  const EC_POINT *pubkey = NULL;
+  EC_KEY *eckey;
+
+  if (!ctx->pkey || !ctx->peerkey) {
+    OPENSSL_PUT_ERROR(EVP, EVP_R_KEYS_NOT_SET);
+    return 0;
+  }
+
+  eckey = ctx->pkey->pkey.ec;
+
+  if (!key) {
+    const EC_GROUP *group;
+    group = EC_KEY_get0_group(eckey);
+    *keylen = (EC_GROUP_get_degree(group) + 7) / 8;
+    return 1;
+  }
+  pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
+
+  /* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is
+   * not an error, the result is truncated. */
+
+  outlen = *keylen;
+
+  ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
+  if (ret < 0) {
+    return 0;
+  }
+  *keylen = ret;
+  return 1;
+}
+
+static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) {
+  EC_PKEY_CTX *dctx = ctx->data;
+
+  switch (type) {
+    case EVP_PKEY_CTRL_MD:
+      if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
+          EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
+          EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
+          EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
+          EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
+          EVP_MD_type((const EVP_MD *)p2) != NID_sha512) {
+        OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_DIGEST_TYPE);
+        return 0;
+      }
+      dctx->md = p2;
+      return 1;
+
+    case EVP_PKEY_CTRL_GET_MD:
+      *(const EVP_MD **)p2 = dctx->md;
+      return 1;
+
+    case EVP_PKEY_CTRL_PEER_KEY:
+      /* Default behaviour is OK */
+      return 1;
+
+    default:
+      OPENSSL_PUT_ERROR(EVP, EVP_R_COMMAND_NOT_SUPPORTED);
+      return 0;
+  }
+}
+
+static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) {
+  if (ctx->pkey == NULL) {
+    OPENSSL_PUT_ERROR(EVP, EVP_R_NO_PARAMETERS_SET);
+    return 0;
+  }
+  EC_KEY *ec = EC_KEY_new();
+  if (ec == NULL ||
+      !EC_KEY_set_group(ec, EC_KEY_get0_group(ctx->pkey->pkey.ec)) ||
+      !EC_KEY_generate_key(ec)) {
+    EC_KEY_free(ec);
+    return 0;
+  }
+  EVP_PKEY_assign_EC_KEY(pkey, ec);
+  return 1;
+}
+
+const EVP_PKEY_METHOD ec_pkey_meth = {
+    EVP_PKEY_EC,
+    pkey_ec_init,
+    pkey_ec_copy,
+    pkey_ec_cleanup,
+    pkey_ec_keygen,
+    pkey_ec_sign,
+    pkey_ec_verify,
+    0 /* verify_recover */,
+    0 /* encrypt */,
+    0 /* decrypt */,
+    pkey_ec_derive,
+    pkey_ec_ctrl,
+};