add crypto sha1, sha256, sha512

internal/lib/crypto/sha1/sha1.go

@@ -0,0 +1,53 @@
+package sha1
+
+// llgo:skipall
+
+import (
+	"hash"
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/openssl"
+)
+
+// The blocksize of SHA-1 in bytes.
+const BlockSize = 64
+
+// The size of a SHA-1 checksum in bytes.
+const Size = 20
+
+type digest struct {
+	ctx openssl.SHA_CTX
+}
+
+func (d *digest) Size() int { return Size }
+
+func (d *digest) BlockSize() int { return BlockSize }
+
+func (d *digest) Reset() {
+	d.ctx.Init()
+}
+
+func (d *digest) Write(p []byte) (nn int, err error) {
+	d.ctx.UpdateBytes(p)
+	return len(p), nil
+}
+
+func (d *digest) Sum(in []byte) []byte {
+	hash := (*[Size]byte)(c.Alloca(Size))
+	d.ctx.Final((*byte)(unsafe.Pointer(hash)))
+	return append(in, hash[:]...)
+}
+
+// New returns a new hash.Hash computing the SHA1 checksum.
+func New() hash.Hash {
+	d := new(digest)
+	d.ctx.Init()
+	return d
+}
+
+// Sum returns the SHA-1 checksum of the data.
+func Sum(data []byte) (ret [Size]byte) {
+	openssl.SHA1Bytes(data, &ret[0])
+	return
+}