# package sha1 - crypto/sha1 - godocs.io

```
import "crypto/sha1"
```

Package sha1 implements the SHA-1 hash algorithm as defined in RFC 3174.

SHA-1 is cryptographically broken and should not be used for secure applications.

## Constants

```
const BlockSize = 64
```
The blocksize of SHA-1 in bytes.

```
const Size = 20
```
The size of a SHA-1 checksum in bytes.

## Functions

### func New
```
func New() hash.Hash
```
New returns a new hash.Hash computing the SHA1 checksum. The Hash also implements encoding.BinaryMarshaler and encoding.BinaryUnmarshaler to marshal and unmarshal the internal state of the hash.

### Example

Code:
```
package main

import (
	"crypto/sha1"
	"fmt"
	"io"
)

func main() {
	h := sha1.New()
	io.WriteString(h, "His money is twice tainted:")
	io.WriteString(h, " 'taint yours and 'taint mine.")
	fmt.Printf("% x", h.Sum(nil))
}

```

Output:
```
59 7f 6a 54 00 10 f9 4c 15 d7 18 06 a9 9a 2c 87 10 e7 47 bd
```

### Example (File)

Code:
```
package main

import (
	"crypto/sha1"
	"fmt"
	"io"
	"log"
	"os"
)

func main() {
	f, err := os.Open("file.txt")
	if err != nil {
		log.Fatal(err)
	}
	defer f.Close()

	h := sha1.New()
	if _, err := io.Copy(h, f); err != nil {
		log.Fatal(err)
	}

	fmt.Printf("% x", h.Sum(nil))
}

```

### func Sum
```
func Sum(data []byte) [Size]byte
```
Sum returns the SHA-1 checksum of the data.

### Example

Code:
```
package main

import (
	"crypto/sha1"
	"fmt"
)

func main() {
	data := []byte("This page intentionally left blank.")
	fmt.Printf("% x", sha1.Sum(data))
}

```

Output:
```
af 06 49 23 bb f2 30 15 96 aa c4 c2 73 ba 32 17 8e bc 4a 96
```

## Details
=> ?view=versions Version: v1.22.5 (latest)
* Published: Jun 27, 2024
=> ?view=platforms Platform: linux/amd64
=> ?view=imports Imports: 7 packages
* Last checked: 18 seconds ago
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