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Returns the base64-representation of arg as a string. The argument arg may be a string, a non-negative integer or a list of octets.
Examples:
(%i1) base64: base64("foo bar baz"); (%o1) Zm9vIGJhciBiYXo= (%i2) string: base64_decode(base64); (%o2) foo bar baz (%i3) obase: 16.$ (%i4) integer: base64_decode(base64, 'number); (%o4) 666f6f206261722062617a (%i5) octets: base64_decode(base64, 'list); (%o5) [66, 6F, 6F, 20, 62, 61, 72, 20, 62, 61, 7A] (%i6) ibase: 16.$ (%i7) base64(octets); (%o7) Zm9vIGJhciBiYXo=
Note that if arg contains umlauts (resp. octets larger than 127) the resulting base64-string is platform dependent. However the decoded string will be equal to the original.
‘Category: Package stringproc’
By default base64_decode
decodes the base64-string back to the original string.
The optional argument return-type allows base64_decode
to
alternatively return the corresponding number or list of octets.
return-type may be string
, number
or list
.
Example: See base64.
‘Category: Package stringproc’
By default crc24sum
returns the CRC24
checksum of an octet-list
as a string.
The optional argument return-type allows crc24sum
to
alternatively return the corresponding number or list of octets.
return-type may be string
, number
or list
.
Example:
-----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQEcBAEBAgAGBQJVdCTzAAoJEG/1Mgf2DWAqCSYH/AhVFwhu1D89C3/QFcgVvZTM wnOYzBUURJAL/cT+IngkLEpp3hEbREcugWp+Tm6aw3R4CdJ7G3FLxExBH/5KnDHi rBQu+I7+3ySK2hpryQ6Wx5J9uZSa4YmfsNteR8up0zGkaulJeWkS4pjiRM+auWVe vajlKZCIK52P080DG7Q2dpshh4fgTeNwqCuCiBhQ73t8g1IaLdhDN6EzJVjGIzam /spqT/sTo6sw8yDOJjvU+Qvn6/mSMjC/YxjhRMaQt9EMrR1AZ4ukBF5uG1S7mXOH WdiwkSPZ3gnIBhM9SuC076gLWZUNs6NqTeE3UzMjDAFhH3jYk1T7mysCvdtIkms= =WmeC -----END PGP SIGNATURE-----
(%i1) ibase : obase : 16.$ (%i2) sig64 : sconcat( "iQEcBAEBAgAGBQJVdCTzAAoJEG/1Mgf2DWAqCSYH/AhVFwhu1D89C3/QFcgVvZTM", "wnOYzBUURJAL/cT+IngkLEpp3hEbREcugWp+Tm6aw3R4CdJ7G3FLxExBH/5KnDHi", "rBQu+I7+3ySK2hpryQ6Wx5J9uZSa4YmfsNteR8up0zGkaulJeWkS4pjiRM+auWVe", "vajlKZCIK52P080DG7Q2dpshh4fgTeNwqCuCiBhQ73t8g1IaLdhDN6EzJVjGIzam", "/spqT/sTo6sw8yDOJjvU+Qvn6/mSMjC/YxjhRMaQt9EMrR1AZ4ukBF5uG1S7mXOH", "WdiwkSPZ3gnIBhM9SuC076gLWZUNs6NqTeE3UzMjDAFhH3jYk1T7mysCvdtIkms=" )$ (%i3) octets: base64_decode(sig64, 'list)$ (%i4) crc24: crc24sum(octets, 'list); (%o4) [5A, 67, 82] (%i5) base64(crc24); (%o5) WmeC
‘Category: Package stringproc’
Returns the MD5
checksum of a string, a non-negative integer or
a list of octets. The default return value is a string containing 32 hex characters.
The optional argument return-type allows md5sum
to alternatively
return the corresponding number or list of octets.
return-type may be string
, number
or list
.
Examples:
(%i1) ibase: obase: 16.$ (%i2) msg: "foo bar baz"$ (%i3) string: md5sum(msg); (%o3) ab07acbb1e496801937adfa772424bf7 (%i4) integer: md5sum(msg, 'number); (%o4) 0ab07acbb1e496801937adfa772424bf7 (%i5) octets: md5sum(msg, 'list); (%o5) [0AB,7,0AC,0BB,1E,49,68,1,93,7A,0DF,0A7,72,42,4B,0F7] (%i6) sdowncase( printf(false, "~{~2,'0x~^:~}", octets) ); (%o6) ab:07:ac:bb:1e:49:68:01:93:7a:df:a7:72:42:4b:f7
Note that in case arg contains German umlauts or other non-ASCII
characters (resp. octets larger than 127) the MD5
checksum is platform dependent.
‘Category: Package stringproc’
Returns a pseudo random number of variable length. By default the returned value is a number with a length of len octets.
The optional argument return-type allows mgf1_sha1
to alternatively
return the corresponding list of len octets.
return-type may be number
or list
.
The computation of the returned value is described in RFC 3447
,
appendix B.2.1 MGF1
.
SHA1
ist used as hash function, i.e. the randomness of the computed number
relies on the randomness of SHA1
hashes.
Example:
(%i1) ibase: obase: 16.$ (%i2) number: mgf1_sha1(4711., 8); (%o2) 0e0252e5a2a42fea1 (%i3) octets: mgf1_sha1(4711., 8, 'list); (%o3) [0E0,25,2E,5A,2A,42,0FE,0A1]
‘Category: Package stringproc’
Returns an octet-representation of number as a list of octets. The number must be a non-negative integer.
Example:
(%i1) ibase : obase : 16.$ (%i2) octets: [0ca,0fe,0ba,0be]$ (%i3) number: octets_to_number(octets); (%o3) 0cafebabe (%i4) number_to_octets(number); (%o4) [0CA, 0FE, 0BA, 0BE]
‘Category: Package stringproc’
Returns a number by concatenating the octets in the list of octets.
Example: See number_to_octets.
‘Category: Package stringproc’
Computes an object identifier (OID) from the list of octets.
Example: RSA encryption OID
(%i1) ibase : obase : 16.$ (%i2) oid: octets_to_oid([2A,86,48,86,0F7,0D,1,1,1]); (%o2) 1.2.840.113549.1.1.1 (%i3) oid_to_octets(oid); (%o3) [2A, 86, 48, 86, 0F7, 0D, 1, 1, 1]
‘Category: Package stringproc’
Decodes the list of octets into a string according to current system defaults. When decoding octets corresponding to Non-US-ASCII characters the result depends on the platform, application and underlying Lisp.
Example: Using system defaults (Maxima compiled with GCL, which uses no format definition and simply passes through the UTF-8-octets encoded by the GNU/Linux terminal).
(%i1) octets: string_to_octets("abc"); (%o1) [61, 62, 63] (%i2) octets_to_string(octets); (%o2) abc (%i3) ibase: obase: 16.$ (%i4) unicode(20AC); (%o4) € (%i5) octets: string_to_octets(%); (%o5) [0E2, 82, 0AC] (%i6) octets_to_string(octets); (%o6) € (%i7) utf8_to_unicode(octets); (%o7) 20AC
In case the external format of the Lisp reader is equal to UTF-8 the optional argument encoding allows to set the encoding for the octet to string conversion. If necessary see adjust_external_format for changing the external format.
Some names of supported encodings (see corresponding Lisp manual for more):
CCL, CLISP, SBCL: utf-8, ucs-2be, ucs-4be, iso-8859-1, cp1252, cp850
CMUCL: utf-8, utf-16-be, utf-32-be, iso8859-1, cp1252
ECL: utf-8, ucs-2be, ucs-4be, iso-8859-1, windows-cp1252, dos-cp850
Example (continued): Using the optional encoding argument (Maxima compiled with SBCL, GNU/Linux terminal).
(%i8) string_to_octets("€", "ucs-2be"); (%o8) [20, 0AC]
‘Category: Package stringproc’
Converts an object identifier (OID) to a list of octets.
Example: See octets_to_oid.
‘Category: Package stringproc’
Returns the SHA1
fingerprint of a string, a non-negative integer or
a list of octets. The default return value is a string containing 40 hex characters.
The optional argument return-type allows sha1sum
to alternatively
return the corresponding number or list of octets.
return-type may be string
, number
or list
.
Example:
(%i1) ibase: obase: 16.$ (%i2) msg: "foo bar baz"$ (%i3) string: sha1sum(msg); (%o3) c7567e8b39e2428e38bf9c9226ac68de4c67dc39 (%i4) integer: sha1sum(msg, 'number); (%o4) 0c7567e8b39e2428e38bf9c9226ac68de4c67dc39 (%i5) octets: sha1sum(msg, 'list); (%o5) [0C7,56,7E,8B,39,0E2,42,8E,38,0BF,9C,92,26,0AC,68,0DE,4C,67,0DC,39] (%i6) sdowncase( printf(false, "~{~2,'0x~^:~}", octets) ); (%o6) c7:56:7e:8b:39:e2:42:8e:38:bf:9c:92:26:ac:68:de:4c:67:dc:39
Note that in case arg contains German umlauts or other non-ASCII
characters (resp. octets larger than 127) the SHA1
fingerprint is platform dependent.
‘Category: Package stringproc’
Returns the SHA256
fingerprint of a string, a non-negative integer or
a list of octets. The default return value is a string containing 64 hex characters.
The optional argument return-type allows sha256sum
to alternatively
return the corresponding number or list of octets (see sha1sum).
Example:
(%i1) string: sha256sum("foo bar baz"); (%o1) dbd318c1c462aee872f41109a4dfd3048871a03dedd0fe0e757ced57dad6f2d7
Note that in case arg contains German umlauts or other non-ASCII
characters (resp. octets larger than 127) the SHA256
fingerprint is platform dependent.
‘Category: Package stringproc’
Encodes a string into a list of octets according to current system defaults. When encoding strings containing Non-US-ASCII characters the result depends on the platform, application and underlying Lisp.
In case the external format of the Lisp reader is equal to UTF-8 the optional argument encoding allows to set the encoding for the string to octet conversion. If necessary see adjust_external_format for changing the external format.
See octets_to_string for examples and some more information.
‘Category: Package stringproc’
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