add crypto sha1, sha256, sha512

internal/lib/crypto/sha256/sha224.go

@@ -0,0 +1,31 @@
+package sha256
+
+import (
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/openssl"
+)
+
+type digest224 struct {
+	ctx openssl.SHA224_CTX
+}
+
+func (d *digest224) Size() int { return Size224 }
+
+func (d *digest224) BlockSize() int { return BlockSize }
+
+func (d *digest224) Reset() {
+	d.ctx.Init()
+}
+
+func (d *digest224) Write(p []byte) (nn int, err error) {
+	d.ctx.UpdateBytes(p)
+	return len(p), nil
+}
+
+func (d *digest224) Sum(in []byte) []byte {
+	hash := (*[Size]byte)(c.Alloca(Size))
+	d.ctx.Final((*byte)(unsafe.Pointer(hash)))
+	return append(in, hash[:]...)
+}