mirror of https://github.com/minio/minio.git
72 lines
1.7 KiB
Go
72 lines
1.7 KiB
Go
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/*
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* Mini Object Storage, (C) 2014 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// +build amd64
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package sha1
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// #include <stdio.h>
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// #include <stdint.h>
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// void sha1_transform(int32_t *hash, const char* input, size_t num_blocks);
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import "C"
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import (
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"errors"
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"github.com/minio-io/minio/pkgs/cpu"
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"unsafe"
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)
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const (
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SHA1_BLOCKSIZE = 64
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SHA1_DIGESTSIZE = 20
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)
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func Sha1(buffer []byte) ([]int32, error) {
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if !cpu.HasAVX2() {
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// Unsupported processor but do not error out tests
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return []int32{0}, nil
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}
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var shbuf []int32
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var cbuffer *C.char
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shbuf = make([]int32, SHA1_DIGESTSIZE)
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var length = len(buffer)
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if length == 0 {
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return []int32{0}, errors.New("Invalid input")
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}
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rem := length % SHA1_BLOCKSIZE
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padded_len := length
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if rem > 0 {
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padded_len = length + (SHA1_BLOCKSIZE - rem)
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}
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rounds := padded_len / SHA1_BLOCKSIZE
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pad := padded_len - length
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if pad > 0 {
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s := make([]byte, pad)
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// Expand with new padded blocks to the byte array
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buffer = append(buffer, s...)
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}
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cshbuf := (*C.int32_t)(unsafe.Pointer(&shbuf[0]))
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cbuffer = (*C.char)(unsafe.Pointer(&buffer[0]))
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C.sha1_transform(cshbuf, cbuffer, C.size_t(rounds))
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return shbuf, nil
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}
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