R: Calculate a SHA1 hash of an object

sha1 {digest} | R Documentation

## Calculate a SHA1 hash of an object

### Description

Calculate a SHA1 hash of an object. The main difference with `digest(x, algo = "sha1")` is that `sha1()` will give the same hash on 32-bit and 64-bit systems. Note that the results depends on the setting of `digits` and `zapsmall` when handling floating point numbers. The current defaults keep `digits` and `zapsmall` as large as possible while maintaining the same hash on 32 bit and 64 bit systems.

### Usage

    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'integer'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'numeric'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'character'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'factor'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'complex'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'Date'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'NULL'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'logical'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'matrix'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'data.frame'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'array'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'list'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'pairlist'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'name'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'POSIXlt'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'POSIXct'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'anova'
    sha1(x, digits = 4, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'function'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'call'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
    ## S3 method for class 'raw'
    sha1(x, digits = 14, zapsmall = 7, ..., algo = "sha1")

### Arguments

`x` | the object to calculate the SHA1
`digits` | the approximate number of significant digits in base 10. Will be converted to a base 16 equivalent. Defaults to `digits = 14`, expect for sha1.anova where `digits = 4`
`zapsmall` | the approximate negative magnitude of the smallest relevant digit. Will be converted to a base 2 equivalent. Values smaller than this number are equivalent to 0. Defaults to `zapsmall = 7`
`...` | Ignored in most methods. See Details for usage
`algo` | The hashing algoritm to be used by `digest`. Defaults to "sha1"

### Details

Extra arguments:

environment: An optional extra argument for `sha1.function`. Should be TRUE, FALSE or missing. `sha1.function` will ignore the enviroment of the function only when `environment = FALSE`.

### Note

`sha1` gained an `algo` argument since version 0.6.15. This allows `sha1()` to use all hashing algoritms available in `digest()`. The hashes created with `sha1(x)` from digest >= 0.6.15 are identical to `sha1(x)` from digest <= 0.6.14. The only exceptions are hashes created with `sha1(x, algo = "sha1")`, they will be different starting from digest 0.6.15

### Author(s)

Thierry Onkelinx

[Package digest version 0.6.15 Index]