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.\" ========================================================================
.\"
.IX Title "Crypt::Digest 3pm"
.TH Crypt::Digest 3pm "2019-05-29" "perl v5.24.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Crypt::Digest \- Generic interface to hash/digest functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&   ### Functional interface:
\&   use Crypt::Digest qw( digest_data digest_data_hex digest_data_b64 digest_data_b64u
\&                         digest_file digest_file_hex digest_file_b64 digest_file_b64u );
\&
\&   # calculate digest from string/buffer
\&   $digest_raw  = digest_data(\*(AqSHA1\*(Aq, \*(Aqdata string\*(Aq);
\&   $digest_hex  = digest_data_hex(\*(AqSHA1\*(Aq, \*(Aqdata string\*(Aq);
\&   $digest_b64  = digest_data_b64(\*(AqSHA1\*(Aq, \*(Aqdata string\*(Aq);
\&   $digest_b64u = digest_data_b64u(\*(AqSHA1\*(Aq, \*(Aqdata string\*(Aq);
\&   # calculate digest from file
\&   $digest_raw  = digest_file(\*(AqSHA1\*(Aq, \*(Aqfilename.dat\*(Aq);
\&   $digest_hex  = digest_file_hex(\*(AqSHA1\*(Aq, \*(Aqfilename.dat\*(Aq);
\&   $digest_b64  = digest_file_b64(\*(AqSHA1\*(Aq, \*(Aqfilename.dat\*(Aq);
\&   $digest_b64u = digest_file_b64u(\*(AqSHA1\*(Aq, \*(Aqfilename.dat\*(Aq);
\&   # calculate digest from filehandle
\&   $digest_raw  = digest_file(\*(AqSHA1\*(Aq, *FILEHANDLE);
\&   $digest_hex  = digest_file_hex(\*(AqSHA1\*(Aq, *FILEHANDLE);
\&   $digest_b64  = digest_file_b64(\*(AqSHA1\*(Aq, *FILEHANDLE);
\&   $digest_b64u = digest_file_b64u(\*(AqSHA1\*(Aq, *FILEHANDLE);
\&
\&   ### OO interface:
\&   use Crypt::Digest;
\&
\&   $d = Crypt::Digest\->new(\*(AqSHA1\*(Aq);
\&   $d\->add(\*(Aqany data\*(Aq);
\&   $d\->addfile(\*(Aqfilename.dat\*(Aq);
\&   $d\->addfile(*FILEHANDLE);
\&   $result_raw  = $d\->digest;     # raw bytes
\&   $result_hex  = $d\->hexdigest;  # hexadecimal form
\&   $result_b64  = $d\->b64digest;  # Base64 form
\&   $result_b64u = $d\->b64udigest; # Base64 URL Safe form
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Provides an interface to various hash/digest algorithms.
.SH "EXPORT"
.IX Header "EXPORT"
Nothing is exported by default.
.PP
You can export selected functions:
.PP
.Vb 2
\&  use Crypt::Digest qw( digest_data digest_data_hex digest_data_b64 digest_data_b64u
\&                        digest_file digest_file_hex digest_file_b64 digest_file_b64u );
.Ve
.PP
Or all of them at once:
.PP
.Vb 1
\&  use Crypt::Digest \*(Aq:all\*(Aq;
.Ve
.SH "FUNCTIONS"
.IX Header "FUNCTIONS"
Please note that all functions take as its first argument the algorithm name, supported values are:
.PP
.Vb 6
\& \*(AqCHAES\*(Aq, \*(AqMD2\*(Aq, \*(AqMD4\*(Aq, \*(AqMD5\*(Aq, \*(AqRIPEMD128\*(Aq, \*(AqRIPEMD160\*(Aq,
\& \*(AqRIPEMD256\*(Aq, \*(AqRIPEMD320\*(Aq, \*(AqSHA1\*(Aq, \*(AqSHA224\*(Aq, \*(AqSHA256\*(Aq,
\& \*(AqSHA384\*(Aq, \*(AqSHA512\*(Aq, \*(AqSHA512_224\*(Aq, \*(AqSHA512_256\*(Aq, \*(AqTiger192\*(Aq, \*(AqWhirlpool\*(Aq,
\& \*(AqSHA3_224\*(Aq, \*(AqSHA3_256\*(Aq, \*(AqSHA3_384\*(Aq, \*(AqSHA3_512\*(Aq,
\& \*(AqBLAKE2b_160\*(Aq, \*(AqBLAKE2b_256\*(Aq, \*(AqBLAKE2b_384\*(Aq, \*(AqBLAKE2b_512\*(Aq,
\& \*(AqBLAKE2s_128\*(Aq, \*(AqBLAKE2s_160\*(Aq, \*(AqBLAKE2s_224\*(Aq, \*(AqBLAKE2s_256\*(Aq
\&
\& (simply any <NAME> for which there is Crypt::Digest::<NAME> module)
.Ve
.SS "digest_data"
.IX Subsection "digest_data"
Logically joins all arguments into a single string, and returns its \s-1SHA1\s0 digest encoded as a binary string.
.PP
.Vb 3
\& $digest_raw = digest_data(\*(AqSHA1\*(Aq, \*(Aqdata string\*(Aq);
\& #or
\& $digest_raw = digest_data(\*(AqSHA1\*(Aq, \*(Aqany data\*(Aq, \*(Aqmore data\*(Aq, \*(Aqeven more data\*(Aq);
.Ve
.SS "digest_data_hex"
.IX Subsection "digest_data_hex"
Logically joins all arguments into a single string, and returns its \s-1SHA1\s0 digest encoded as a hexadecimal string.
.PP
.Vb 3
\& $digest_hex = digest_data_hex(\*(AqSHA1\*(Aq, \*(Aqdata string\*(Aq);
\& #or
\& $digest_hex = digest_data_hex(\*(AqSHA1\*(Aq, \*(Aqany data\*(Aq, \*(Aqmore data\*(Aq, \*(Aqeven more data\*(Aq);
.Ve
.SS "digest_data_b64"
.IX Subsection "digest_data_b64"
Logically joins all arguments into a single string, and returns its \s-1SHA1\s0 digest encoded as a Base64 string, \fBwith\fR trailing '=' padding.
.PP
.Vb 3
\& $digest_b64 = digest_data_b64(\*(AqSHA1\*(Aq, \*(Aqdata string\*(Aq);
\& #or
\& $digest_b64 = digest_data_b64(\*(AqSHA1\*(Aq, \*(Aqany data\*(Aq, \*(Aqmore data\*(Aq, \*(Aqeven more data\*(Aq);
.Ve
.SS "digest_data_b64u"
.IX Subsection "digest_data_b64u"
Logically joins all arguments into a single string, and returns its \s-1SHA1\s0 digest encoded as a Base64 \s-1URL\s0 Safe string (see \s-1RFC 4648\s0 section 5).
.PP
.Vb 3
\& $digest_b64url = digest_data_b64u(\*(AqSHA1\*(Aq, \*(Aqdata string\*(Aq);
\& #or
\& $digest_b64url = digest_data_b64u(\*(AqSHA1\*(Aq, \*(Aqany data\*(Aq, \*(Aqmore data\*(Aq, \*(Aqeven more data\*(Aq);
.Ve
.SS "digest_file"
.IX Subsection "digest_file"
Reads file (defined by filename or filehandle) content, and returns its digest encoded as a binary string.
.PP
.Vb 3
\& $digest_raw = digest_file(\*(AqSHA1\*(Aq, \*(Aqfilename.dat\*(Aq);
\& #or
\& $digest_raw = digest_file(\*(AqSHA1\*(Aq, *FILEHANDLE);
.Ve
.SS "digest_file_hex"
.IX Subsection "digest_file_hex"
Reads file (defined by filename or filehandle) content, and returns its digest encoded as a hexadecimal string.
.PP
.Vb 3
\& $digest_hex = digest_file_hex(\*(AqSHA1\*(Aq, \*(Aqfilename.dat\*(Aq);
\& #or
\& $digest_hex = digest_file_hex(\*(AqSHA1\*(Aq, *FILEHANDLE);
.Ve
.PP
\&\fB\s-1BEWARE:\s0\fR You have to make sure that the filehandle is in binary mode before you pass it as argument to the \fIaddfile()\fR method.
.SS "digest_file_b64"
.IX Subsection "digest_file_b64"
Reads file (defined by filename or filehandle) content, and returns its digest encoded as a Base64 string, \fBwith\fR trailing '=' padding.
.PP
.Vb 3
\& $digest_b64 = digest_file_b64(\*(AqSHA1\*(Aq, \*(Aqfilename.dat\*(Aq);
\& #or
\& $digest_b64 = digest_file_b64(\*(AqSHA1\*(Aq, *FILEHANDLE);
.Ve
.SS "digest_file_b64u"
.IX Subsection "digest_file_b64u"
Reads file (defined by filename or filehandle) content, and returns its digest encoded as a Base64 \s-1URL\s0 Safe string (see \s-1RFC 4648\s0 section 5).
.PP
.Vb 3
\& $digest_b64url = digest_file_b64u(\*(AqSHA1\*(Aq, \*(Aqfilename.dat\*(Aq);
\& #or
\& $digest_b64url = digest_file_b64u(\*(AqSHA1\*(Aq, *FILEHANDLE);
.Ve
.SH "METHODS"
.IX Header "METHODS"
.SS "new"
.IX Subsection "new"
Constructor, returns a reference to the digest object.
.PP
.Vb 6
\& $d = Crypt::Digest\->new($name);
\& # $name could be: \*(AqCHAES\*(Aq, \*(AqMD2\*(Aq, \*(AqMD4\*(Aq, \*(AqMD5\*(Aq, \*(AqRIPEMD128\*(Aq, \*(AqRIPEMD160\*(Aq,
\& #                 \*(AqRIPEMD256\*(Aq, \*(AqRIPEMD320\*(Aq, \*(AqSHA1\*(Aq, \*(AqSHA224\*(Aq, \*(AqSHA256\*(Aq, \*(AqSHA384\*(Aq,
\& #                 \*(AqSHA512\*(Aq, \*(AqSHA512_224\*(Aq, \*(AqSHA512_256\*(Aq, \*(AqTiger192\*(Aq, \*(AqWhirlpool\*(Aq
\& #
\& # simply any <FUNCNAME> for which there is Crypt::Digest::<FUNCNAME> module
.Ve
.SS "clone"
.IX Subsection "clone"
Creates a copy of the digest object state and returns a reference to the copy.
.PP
.Vb 1
\& $d\->clone();
.Ve
.SS "reset"
.IX Subsection "reset"
Reinitialize the digest object state and returns a reference to the digest object.
.PP
.Vb 1
\& $d\->reset();
.Ve
.SS "add"
.IX Subsection "add"
All arguments are appended to the message we calculate digest for.
The return value is the digest object itself.
.PP
.Vb 3
\& $d\->add(\*(Aqany data\*(Aq);
\& #or
\& $d\->add(\*(Aqany data\*(Aq, \*(Aqmore data\*(Aq, \*(Aqeven more data\*(Aq);
.Ve
.PP
Note that all the following cases are equivalent:
.PP
.Vb 2
\& # case 1
\& $d\->add(\*(Aqaa\*(Aq, \*(Aqbb\*(Aq, \*(Aqcc\*(Aq);
\&
\& # case 2
\& $d\->add(\*(Aqaa\*(Aq);
\& $d\->add(\*(Aqbb\*(Aq);
\& $d\->add(\*(Aqcc\*(Aq);
\&
\& # case 3
\& $d\->add(\*(Aqaabbcc\*(Aq);
\&
\& # case 4
\& $d\->add(\*(Aqaa\*(Aq)\->add(\*(Aqbb\*(Aq)\->add(\*(Aqcc\*(Aq);
.Ve
.SS "addfile"
.IX Subsection "addfile"
The content of the file (or filehandle) is appended to the message we calculate digest for.
The return value is the digest object itself.
.PP
.Vb 3
\& $d\->addfile(\*(Aqfilename.dat\*(Aq);
\& #or
\& $d\->addfile(*FILEHANDLE);
.Ve
.PP
\&\fB\s-1BEWARE:\s0\fR You have to make sure that the filehandle is in binary mode before you pass it as argument to the \fIaddfile()\fR method.
.SS "add_bits"
.IX Subsection "add_bits"
This method is available mostly for compatibility with other Digest::SOMETHING modules on \s-1CPAN,\s0 you are very unlikely to need it.
The return value is the digest object itself.
.PP
.Vb 3
\& $d\->add_bits($bit_string);   # e.g. $d\->add_bits("111100001010");
\& #or
\& $d\->add_bits($data, $nbits); # e.g. $d\->add_bits("\exF0\exA0", 16);
.Ve
.PP
\&\fB\s-1BEWARE:\s0\fR It is not possible to add bits that are not a multiple of 8.
.SS "hashsize"
.IX Subsection "hashsize"
Returns the length of calculated digest in bytes (e.g. 32 for \s-1SHA\-256\s0).
.PP
.Vb 5
\& $d\->hashsize;
\& #or
\& Crypt::Digest\->hashsize(\*(AqSHA1\*(Aq);
\& #or
\& Crypt::Digest::hashsize(\*(AqSHA1\*(Aq);
.Ve
.SS "digest"
.IX Subsection "digest"
Returns the binary digest (raw bytes).
.PP
.Vb 1
\& $result_raw = $d\->digest();
.Ve
.SS "hexdigest"
.IX Subsection "hexdigest"
Returns the digest encoded as a hexadecimal string.
.PP
.Vb 1
\& $result_hex = $d\->hexdigest();
.Ve
.SS "b64digest"
.IX Subsection "b64digest"
Returns the digest encoded as a Base64 string, \fBwith\fR trailing '=' padding (\fB\s-1BEWARE:\s0\fR this padding
style might differ from other Digest::<\s-1SOMETHING\s0> modules on \s-1CPAN\s0).
.PP
.Vb 1
\& $result_b64 = $d\->b64digest();
.Ve
.SS "b64udigest"
.IX Subsection "b64udigest"
Returns the digest encoded as a Base64 \s-1URL\s0 Safe string (see \s-1RFC 4648\s0 section 5).
.PP
.Vb 1
\& $result_b64url = $d\->b64udigest();
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
.IP "\(bu" 4
CryptX
.IP "\(bu" 4
Crypt::Digest tries to be compatible with Digest interface.
.IP "\(bu" 4
Check subclasses like Crypt::Digest::SHA1, Crypt::Digest::MD5, ...