crypto: Add BoringSSL accelerated version of SHA-1

crypto/secure_hash.cc

Index: crypto/secure_hash.cc
diff --git a/crypto/secure_hash.cc b/crypto/secure_hash.cc
index 2a5a1f02089e6f1ddd24523ab6f39fd31bea744a..09cbb0139ee4414a0f997c8be1cad17e7cf15e78 100644
--- a/crypto/secure_hash.cc
+++ b/crypto/secure_hash.cc
@@ -16,6 +16,34 @@ namespace crypto {
 
 namespace {
 
+class SecureHashSHA1 : public SecureHash {
+ public:
+  SecureHashSHA1() { SHA1_Init(&ctx_); }
+
+  SecureHashSHA1(const SecureHashSHA1& other) {
+    memcpy(&ctx_, &other.ctx_, sizeof(ctx_));
+  }
+
+  ~SecureHashSHA1() override { OPENSSL_cleanse(&ctx_, sizeof(ctx_)); }
+
+  void Update(const void* input, size_t len) override {
+    SHA1_Update(&ctx_, static_cast<const unsigned char*>(input), len);
+  }
+
+  void Finish(void* output, size_t len) override {
+    ScopedOpenSSLSafeSizeBuffer<SHA_DIGEST_LENGTH> result(
+        static_cast<unsigned char*>(output), len);
+    SHA1_Final(result.safe_buffer(), &ctx_);
+  }
+
+  SecureHash* Clone() const override { return new SecureHashSHA1(*this); }
+
+  size_t GetHashLength() const override { return SHA_DIGEST_LENGTH; }
+
+ private:
+  SHA_CTX ctx_;
+};
+
 class SecureHashSHA256 : public SecureHash {
  public:
   SecureHashSHA256() {
@@ -56,6 +84,8 @@ SecureHash* SecureHash::Create(Algorithm algorithm) {
   switch (algorithm) {
     case SHA256:
       return new SecureHashSHA256();
+    case SHA1:
+      return new SecureHashSHA1();
     default:
       NOTIMPLEMENTED();
       return NULL;