Source file src/github.com/aws/smithy-go/rand/rand.go

Documentation: github.com/aws/smithy-go/rand

     1  package rand
     2  
     3  import (
     4  	"crypto/rand"
     5  	"fmt"
     6  	"io"
     7  	"math/big"
     8  )
     9  
    10  func init() {
    11  	Reader = rand.Reader
    12  }
    13  
    14  // Reader provides a random reader that can reset during testing.
    15  var Reader io.Reader
    16  
    17  // Int63n returns a int64 between zero and value of max, read from an io.Reader source.
    18  func Int63n(reader io.Reader, max int64) (int64, error) {
    19  	bi, err := rand.Int(reader, big.NewInt(max))
    20  	if err != nil {
    21  		return 0, fmt.Errorf("failed to read random value, %w", err)
    22  	}
    23  
    24  	return bi.Int64(), nil
    25  }
    26  
    27  // CryptoRandInt63n returns a random int64 between zero and value of max
    28  // obtained from the crypto rand source.
    29  func CryptoRandInt63n(max int64) (int64, error) {
    30  	return Int63n(Reader, max)
    31  }
    32  

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