Add license text

go/gmssl/cipher.go

@@ -1,3 +1,51 @@
+/*
+ * Copyright (c) 2017 - 2018 The GmSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the GmSSL Project.
+ *    (http://gmssl.org/)"
+ *
+ * 4. The name "GmSSL Project" must not be used to endorse or promote
+ *    products derived from this software without prior written
+ *    permission. For written permission, please contact
+ *    guanzhi1980@gmail.com.
+ *
+ * 5. Products derived from this software may not be called "GmSSL"
+ *    nor may "GmSSL" appear in their names without prior written
+ *    permission of the GmSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the GmSSL Project
+ *    (http://gmssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE GmSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
 /* +build cgo */
 package gmssl
 
@@ -87,22 +135,18 @@ type CipherContext struct {
 
 func NewCipherContext(name string, key, iv []byte, encrypt bool) (
 	*CipherContext, error) {
-
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
-
 	cipher := C.EVP_get_cipherbyname(cname)
 	if cipher == nil {
 		return nil, GetErrors()
 	}
-
 	if key == nil {
 		return nil, errors.New("No key")
 	}
 	if len(key) != int(C.EVP_CIPHER_key_length(cipher)) {
 		return nil, errors.New("Invalid key length")
 	}
-
 	if 0 != int(C.EVP_CIPHER_iv_length(cipher)) {
 		if iv == nil {
 			return nil, errors.New("No IV")
@@ -111,27 +155,22 @@ func NewCipherContext(name string, key, iv []byte, encrypt bool) (
 			return nil, errors.New("Invalid IV")
 		}
 	}
-
 	ctx := C.EVP_CIPHER_CTX_new()
 	if ctx == nil {
 		return nil, GetErrors()
 	}
-
 	ret := &CipherContext{ctx}
 	runtime.SetFinalizer(ret, func(ret *CipherContext) {
 		C.EVP_CIPHER_CTX_free(ret.ctx)
 	})
-
 	enc := 1
 	if encrypt == false {
 		enc = 0
 	}
-
 	if 1 != C.EVP_CipherInit(ctx, cipher, (*C.uchar)(&key[0]),
 		(*C.uchar)(&iv[0]), C.int(enc)) {
 		return nil, GetErrors()
 	}
-
 	return ret, nil
 }