hmac

0th

Percentile

compute a hash-based message authentication code

The hmac function calculates a message authentication code (MAC) involving the specified cryptographic hash function in combination with a given secret key.

Keywords
misc
Usage
hmac(key, object, algo = c("md5", "sha1", "crc32", "sha256", "sha512"), serialize = FALSE, raw = FALSE, ...)
Value

The hmac function uses the digest to return a hash digest as specified in the RFC 2104.

References

MD5: http://www.ietf.org/rfc/rfc1321.txt.

SHA-1: http://www.itl.nist.gov/fipspubs/fip180-1.htm. SHA-256: http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf. CRC32: ftp://ftp.rocksoft.com/cliens/rocksoft/papers/crc_v3.txt.

http://www.aarongifford.com/computers/sha.html for the integrated C implementation of sha-512.

http://www.cr0.net:8040/code/crypto for the underlying C functions used here for sha-1 and md5, and further references.

http://zlib.net for documentation on the zlib library which supplied the code for crc32.

http://en.wikipedia.org/wiki/SHA_hash_functions for documentation on the sha functions.

See Also

digest

Aliases
Examples
## Standard RFC 2104 test vectors
current <- hmac('Jefe', 'what do ya want for nothing?', "md5")
target <- '750c783e6ab0b503eaa86e310a5db738'
stopifnot(identical(target, as.character(current)))

current <- hmac(rep(0x0b, 16), 'Hi There', "md5")
target <- '9294727a3638bb1c13f48ef8158bfc9d'
stopifnot(identical(target, as.character(current)))

current <- hmac(rep(0xaa, 16), rep(0xdd, 50), "md5")
target <- '56be34521d144c88dbb8c733f0e8b3f6'
stopifnot(identical(target, as.character(current)))

## SHA1 tests inspired to the RFC 2104 and checked against the python
## hmac implementation.
current <- hmac('Jefe', 'what do ya want for nothing?', "sha1")
target <- 'effcdf6ae5eb2fa2d27416d5f184df9c259a7c79'
stopifnot(identical(target, as.character(current)))

current <- hmac(rep(0x0b, 16), 'Hi There', "sha1")
target <- '675b0b3a1b4ddf4e124872da6c2f632bfed957e9'
stopifnot(identical(target, as.character(current)))

current <- hmac(rep(0xaa, 16), rep(0xdd, 50), "sha1")
target <- 'd730594d167e35d5956fd8003d0db3d3f46dc7bb'
stopifnot(identical(target, as.character(current)))
Documentation reproduced from package digest, version 0.6.3, License: GPL-2

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