space monkey internal commit export

[katamari commit: 2810bbc33c846960c53369be928975330b93d5cb]

sha1.go

@@ -0,0 +1,76 @@
+// Copyright (C) 2014 Space Monkey, Inc.
+// +build cgo
+
+package openssl
+
+/*
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "openssl/evp.h"
+*/
+import "C"
+
+import (
+	"errors"
+	"runtime"
+	"unsafe"
+)
+
+type SHA1Hash struct {
+	ctx C.EVP_MD_CTX
+}
+
+func NewSHA1Hash() (*SHA1Hash, error) {
+	hash := new(SHA1Hash)
+	C.EVP_MD_CTX_init(&hash.ctx)
+	runtime.SetFinalizer(hash, func(h *SHA1Hash) { h.Close() })
+	if err := hash.Reset(); err != nil {
+		return nil, err
+	}
+	return hash, nil
+}
+
+func (s *SHA1Hash) Close() {
+	C.EVP_MD_CTX_cleanup(&s.ctx)
+}
+
+func (s *SHA1Hash) Reset() error {
+	if 1 != C.EVP_DigestInit_ex(&s.ctx, C.EVP_sha1(), nil) {
+		return errors.New("openssl: sha1: cannot init digest ctx")
+	}
+	return nil
+}
+
+func (s *SHA1Hash) Write(p []byte) (n int, err error) {
+	if len(p) == 0 {
+		return 0, nil
+	}
+	if 1 != C.EVP_DigestUpdate(&s.ctx, unsafe.Pointer(&p[0]),
+		C.size_t(len(p))) {
+		return 0, errors.New("openssl: sha1: cannot update digest")
+	}
+	return len(p), nil
+}
+
+func (s *SHA1Hash) Sum() (result [20]byte, err error) {
+	if 1 != C.EVP_DigestFinal_ex(&s.ctx,
+		(*C.uchar)(unsafe.Pointer(&result[0])), nil) {
+		return result, errors.New("openssl: sha1: cannot finalize ctx")
+	}
+	return result, s.Reset()
+}
+
+func SHA1(data []byte) (result [20]byte, err error) {
+	hash, err := NewSHA1Hash()
+	if err != nil {
+		return result, err
+	}
+	defer hash.Close()
+	if _, err := hash.Write(data); err != nil {
+		return result, err
+	}
+	return hash.Sum()
+}

sha1_test.go

@@ -0,0 +1,98 @@
+// Copyright (C) 2014 Space Monkey, Inc.
+// +build cgo
+
+package openssl
+
+import (
+	"crypto/rand"
+	"crypto/sha1"
+	"io"
+	"testing"
+)
+
+func TestSHA1(t *testing.T) {
+	for i := 0; i < 100; i++ {
+		buf := make([]byte, 10*1024-i)
+		if _, err := io.ReadFull(rand.Reader, buf); err != nil {
+			t.Fatal(err)
+		}
+
+		expected := sha1.Sum(buf)
+		got, err := SHA1(buf)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if expected != got {
+			t.Fatal("exp:%x got:%x", expected, got)
+		}
+	}
+}
+
+func TestSHA1Writer(t *testing.T) {
+	ohash, err := NewSHA1Hash()
+	if err != nil {
+		t.Fatal(err)
+	}
+	hash := sha1.New()
+
+	for i := 0; i < 100; i++ {
+		if err := ohash.Reset(); err != nil {
+			t.Fatal(err)
+		}
+		hash.Reset()
+		buf := make([]byte, 10*1024-i)
+		if _, err := io.ReadFull(rand.Reader, buf); err != nil {
+			t.Fatal(err)
+		}
+
+		if _, err := ohash.Write(buf); err != nil {
+			t.Fatal(err)
+		}
+		if _, err := hash.Write(buf); err != nil {
+			t.Fatal(err)
+		}
+
+		var got, exp [20]byte
+
+		hash.Sum(exp[:0])
+		got, err := ohash.Sum()
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if got != exp {
+			t.Fatal("exp:%x got:%x", exp, got)
+		}
+	}
+}
+
+type shafunc func([]byte)
+
+func benchmarkSHA1(b *testing.B, length int64, fn shafunc) {
+	buf := make([]byte, length)
+	if _, err := io.ReadFull(rand.Reader, buf); err != nil {
+		b.Fatal(err)
+	}
+	b.SetBytes(length)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		fn(buf)
+	}
+}
+
+func BenchmarkSHA1Large_openssl(b *testing.B) {
+	benchmarkSHA1(b, 1024*1024, func(buf []byte) { SHA1(buf) })
+}
+
+func BenchmarkSHA1Large_stdlib(b *testing.B) {
+	benchmarkSHA1(b, 1024*1024, func(buf []byte) { sha1.Sum(buf) })
+}
+
+func BenchmarkSHA1Small_openssl(b *testing.B) {
+	benchmarkSHA1(b, 1, func(buf []byte) { SHA1(buf) })
+}
+
+func BenchmarkSHA1Small_stdlib(b *testing.B) {
+	benchmarkSHA1(b, 1, func(buf []byte) { sha1.Sum(buf) })
+}