{
    "mode": "perldoc",
    "parameter": "Crypt::Digest::Keccak256",
    "section": "",
    "url": "https://www.chedong.com/phpMan.php/perldoc/Crypt%3A%3ADigest%3A%3AKeccak256/json",
    "generated": "2026-06-11T17:16:58Z",
    "synopsis": "### Functional interface:\nuse Crypt::Digest::Keccak256 qw( keccak256 keccak256hex keccak256b64 keccak256b64u\nkeccak256file keccak256filehex keccak256fileb64 keccak256fileb64u );\n# calculate digest from string/buffer\n$keccak256raw  = keccak256('data string');\n$keccak256hex  = keccak256hex('data string');\n$keccak256b64  = keccak256b64('data string');\n$keccak256b64u = keccak256b64u('data string');\n# calculate digest from file\n$keccak256raw  = keccak256file('filename.dat');\n$keccak256hex  = keccak256filehex('filename.dat');\n$keccak256b64  = keccak256fileb64('filename.dat');\n$keccak256b64u = keccak256fileb64u('filename.dat');\n# calculate digest from filehandle\n$keccak256raw  = keccak256file(*FILEHANDLE);\n$keccak256hex  = keccak256filehex(*FILEHANDLE);\n$keccak256b64  = keccak256fileb64(*FILEHANDLE);\n$keccak256b64u = keccak256fileb64u(*FILEHANDLE);\n### OO interface:\nuse Crypt::Digest::Keccak256;\n$d = Crypt::Digest::Keccak256->new;\n$d->add('any data');\n$d->addfile('filename.dat');\n$d->addfile(*FILEHANDLE);\n$resultraw  = $d->digest;     # raw bytes\n$resulthex  = $d->hexdigest;  # hexadecimal form\n$resultb64  = $d->b64digest;  # Base64 form\n$resultb64u = $d->b64udigest; # Base64 URL Safe form",
    "sections": {
        "NAME": {
            "content": "Crypt::Digest::Keccak256 - Hash function Keccak-256 [size: 256 bits]\n",
            "subsections": []
        },
        "SYNOPSIS": {
            "content": "### Functional interface:\nuse Crypt::Digest::Keccak256 qw( keccak256 keccak256hex keccak256b64 keccak256b64u\nkeccak256file keccak256filehex keccak256fileb64 keccak256fileb64u );\n\n# calculate digest from string/buffer\n$keccak256raw  = keccak256('data string');\n$keccak256hex  = keccak256hex('data string');\n$keccak256b64  = keccak256b64('data string');\n$keccak256b64u = keccak256b64u('data string');\n# calculate digest from file\n$keccak256raw  = keccak256file('filename.dat');\n$keccak256hex  = keccak256filehex('filename.dat');\n$keccak256b64  = keccak256fileb64('filename.dat');\n$keccak256b64u = keccak256fileb64u('filename.dat');\n# calculate digest from filehandle\n$keccak256raw  = keccak256file(*FILEHANDLE);\n$keccak256hex  = keccak256filehex(*FILEHANDLE);\n$keccak256b64  = keccak256fileb64(*FILEHANDLE);\n$keccak256b64u = keccak256fileb64u(*FILEHANDLE);\n\n### OO interface:\nuse Crypt::Digest::Keccak256;\n\n$d = Crypt::Digest::Keccak256->new;\n$d->add('any data');\n$d->addfile('filename.dat');\n$d->addfile(*FILEHANDLE);\n$resultraw  = $d->digest;     # raw bytes\n$resulthex  = $d->hexdigest;  # hexadecimal form\n$resultb64  = $d->b64digest;  # Base64 form\n$resultb64u = $d->b64udigest; # Base64 URL Safe form\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "Provides an interface to the Keccak256 digest algorithm.\n",
            "subsections": []
        },
        "EXPORT": {
            "content": "Nothing is exported by default.\n\nYou can export selected functions:\n\nuse Crypt::Digest::Keccak256 qw(keccak256 keccak256hex keccak256b64 keccak256b64u\nkeccak256file keccak256filehex keccak256fileb64 keccak256fileb64u);\n\nOr all of them at once:\n\nuse Crypt::Digest::Keccak256 ':all';\n",
            "subsections": []
        },
        "FUNCTIONS": {
            "content": "keccak256\nLogically joins all arguments into a single string, and returns its Keccak256 digest encoded as\na binary string.\n\n$keccak256raw = keccak256('data string');\n#or\n$keccak256raw = keccak256('any data', 'more data', 'even more data');\n\nkeccak256hex\nLogically joins all arguments into a single string, and returns its Keccak256 digest encoded as\na hexadecimal string.\n\n$keccak256hex = keccak256hex('data string');\n#or\n$keccak256hex = keccak256hex('any data', 'more data', 'even more data');\n\nkeccak256b64\nLogically joins all arguments into a single string, and returns its Keccak256 digest encoded as\na Base64 string, with trailing '=' padding.\n\n$keccak256b64 = keccak256b64('data string');\n#or\n$keccak256b64 = keccak256b64('any data', 'more data', 'even more data');\n\nkeccak256b64u\nLogically joins all arguments into a single string, and returns its Keccak256 digest encoded as\na Base64 URL Safe string (see RFC 4648 section 5).\n\n$keccak256b64url = keccak256b64u('data string');\n#or\n$keccak256b64url = keccak256b64u('any data', 'more data', 'even more data');\n\nkeccak256file\nReads file (defined by filename or filehandle) content, and returns its Keccak256 digest encoded\nas a binary string.\n\n$keccak256raw = keccak256file('filename.dat');\n#or\n$keccak256raw = keccak256file(*FILEHANDLE);\n\nkeccak256filehex\nReads file (defined by filename or filehandle) content, and returns its Keccak256 digest encoded\nas a hexadecimal string.\n\n$keccak256hex = keccak256filehex('filename.dat');\n#or\n$keccak256hex = keccak256filehex(*FILEHANDLE);\n\nBEWARE: You have to make sure that the filehandle is in binary mode before you pass it as\nargument to the addfile() method.\n\nkeccak256fileb64\nReads file (defined by filename or filehandle) content, and returns its Keccak256 digest encoded\nas a Base64 string, with trailing '=' padding.\n\n$keccak256b64 = keccak256fileb64('filename.dat');\n#or\n$keccak256b64 = keccak256fileb64(*FILEHANDLE);\n\nkeccak256fileb64u\nReads file (defined by filename or filehandle) content, and returns its Keccak256 digest encoded\nas a Base64 URL Safe string (see RFC 4648 section 5).\n\n$keccak256b64url = keccak256fileb64u('filename.dat');\n#or\n$keccak256b64url = keccak256fileb64u(*FILEHANDLE);\n",
            "subsections": []
        },
        "METHODS": {
            "content": "The OO interface provides the same set of functions as Crypt::Digest.\n\nnew\n$d = Crypt::Digest::Keccak256->new();\n\nclone\n$d->clone();\n\nreset\n$d->reset();\n\nadd\n$d->add('any data');\n#or\n$d->add('any data', 'more data', 'even more data');\n\naddfile\n$d->addfile('filename.dat');\n#or\n$d->addfile(*FILEHANDLE);\n\naddbits\n$d->addbits($bitstring);   # e.g. $d->addbits(\"111100001010\");\n#or\n$d->addbits($data, $nbits); # e.g. $d->addbits(\"\\xF0\\xA0\", 16);\n\nhashsize\n$d->hashsize;\n#or\nCrypt::Digest::Keccak256->hashsize();\n#or\nCrypt::Digest::Keccak256::hashsize();\n\ndigest\n$resultraw = $d->digest();\n\nhexdigest\n$resulthex = $d->hexdigest();\n\nb64digest\n$resultb64 = $d->b64digest();\n\nb64udigest\n$resultb64url = $d->b64udigest();\n",
            "subsections": []
        },
        "SEE ALSO": {
            "content": "*   CryptX, Crypt::Digest\n\n*   <https://keccak.team/index.html>\n",
            "subsections": []
        }
    },
    "summary": "Crypt::Digest::Keccak256 - Hash function Keccak-256 [size: 256 bits]",
    "flags": [],
    "examples": [],
    "see_also": []
}