Revert 283813 "Switch to BoringSSL."

trunk/src/crypto/signature_verifier_openssl.cc

Index: trunk/src/crypto/signature_verifier_openssl.cc
===================================================================
--- trunk/src/crypto/signature_verifier_openssl.cc	(revision 283844)
+++ trunk/src/crypto/signature_verifier_openssl.cc	(working copy)
@@ -26,7 +26,7 @@
     case SignatureVerifier::SHA256:
       return EVP_sha256();
   }
-  return NULL;
+  return EVP_md_null();
 }
 
 }  // namespace
@@ -80,11 +80,8 @@
                                          const uint8* public_key_info,
                                          int public_key_info_len) {
   OpenSSLErrStackTracer err_tracer(FROM_HERE);
-  const EVP_MD* const digest = ToOpenSSLDigest(hash_alg);
+  const EVP_MD* digest = ToOpenSSLDigest(hash_alg);
   DCHECK(digest);
-  if (!digest) {
-    return false;
-  }
 
   EVP_PKEY_CTX* pkey_ctx;
   if (!CommonInit(digest, signature, signature_len, public_key_info,
@@ -95,12 +92,8 @@
   int rv = EVP_PKEY_CTX_set_rsa_padding(pkey_ctx, RSA_PKCS1_PSS_PADDING);
   if (rv != 1)
     return false;
-  const EVP_MD* const mgf_digest = ToOpenSSLDigest(mask_hash_alg);
-  DCHECK(mgf_digest);
-  if (!mgf_digest) {
-    return false;
-  }
-  rv = EVP_PKEY_CTX_set_rsa_mgf1_md(pkey_ctx, mgf_digest);
+  rv = EVP_PKEY_CTX_set_rsa_mgf1_md(pkey_ctx,
+                                    ToOpenSSLDigest(mask_hash_alg));
   if (rv != 1)
     return false;
   rv = EVP_PKEY_CTX_set_rsa_pss_saltlen(pkey_ctx, salt_len);