Computes a non-cryptographic hash of a list of fields. The hash
is returned as an integer in the range [0,4294967295]. Calling
this function with the same values and the same seed (or no
seed) will result in the same hash being computed. This hash is
not cryptographic and should not be used to securely obscure
data (instead use hashRewrite() and
hashMatch() for that). This function can,
for example, be used to reduce the number of groups in a
groupBy(), at the cost of having
collisions.
Click + next to an example below to get the full details.
MD5 Hash Multiple Fields
MD5 hash multiple fields using the crypto:md5() function
Query
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crypto:md5(field=[a,b,c])
Introduction
In this example, the crypto:md5() function is used
to hash the fields a,b,c and
return the result into a field named
_md5.
Step-by-Step
Starting with the source repository events.
logscale
crypto:md5(field=[a,b,c])
Performs a cryptographic MD5-hashing of
a,b,c. The
field argument can be omitted to write:
crypto:md5([a,b,c])
Event Result set.
Summary and Results
The query is used to encode a string using the MD5 hash. When called with
multiple values, crypto:md5() function creates a
single MD5 sum from the combined value of the supplied fields. Combining
fields in this way and converting to an MD5 can be an effective method of
creating a unique ID for a given fieldset which could be used to identify
a specific event type. The MD5 is reproducible (for example, supplying the
same values will produce the same MD5 sum), and so it can sometimes be an
effective method of creating unique identifier or lookup fields for a
join() across two different datasets.
MD5 Hash a Field With a Given Value
MD5 hash a field with a given value using the crypto:md5() function
Query
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a:="Hello, world!"|crypto:md5(a)
Introduction
In this example, the crypto:md5() function is used
to hash the field a with value
Hello, world! and convert the
result into _md5.
Step-by-Step
Starting with the source repository events.
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a:="Hello, world!"
Assigns the value Hello, world! to
the field a.
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|crypto:md5(a)
Performs a cryptographic MD5-hashing of a:=
"Hello, world!". The output value would be
_md5 =
"6cd3556deb0da54bca060b4c39479839"
Event Result set.
Summary and Results
The query is used to encode a string using the MD5 hash. The hash
generators MD5,
SHA-1, and
SHA-256 are, for example, useful
for encoding passwords or representing other strings in the system as
hashed values.
SHA-1 Hash Multiple Fields
SHA-1 hash multiple fields using the crypto:sha1() function
Query
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crypto:sha1(field=[a,b,c])
Introduction
In this example, the crypto:sha1() function is used
to hash the fields a,b,c and
return the result into a field named
_sha1.
Step-by-Step
Starting with the source repository events.
logscale
crypto:sha1(field=[a,b,c])
Performs a cryptographic SHA1-hashing of
a,b,c. The
field argument can be omitted to write:
crypto:sha1([a,b,c])
Event Result set.
Summary and Results
The query is used to encode a string using the SHA-1 hash. When called
with multiple values, crypto:sha1() function creates
a single SHA-1 sum from the combined value of the supplied fields.
Combining fields in this way and converting to an SHa-1 can be an
effective method of creating a unique ID for a given fieldset which could
be used to identify a specific event type. The SHA-1 is reproducible (for
example, supplying the same values will produce the same SHA-1 sum), and
so it can sometimes be an effective method of creating unique identifier
or lookup fields for a join() across two different
datasets.
SHA-1 Hash a Field With a Given Value
SHA-1 hash a field with a given value using the crypto:sha1() function
Query
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a:="Hello, world!"|crypto:sha1(a)
Introduction
In this example, the crypto:sha1() function is used
to hash the field a with value
Hello, world! and convert the
result into _sha1.
Step-by-Step
Starting with the source repository events.
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a:="Hello, world!"
Assigns the value Hello, world! to
the field a.
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|crypto:sha1(a)
Performs a cryptographic SHA-1-hashing of
a:= "Hello, world!". The output
value would be _sha1 =
"943a702d06f34599aee1f8da8ef9f7296031d699"
Event Result set.
Summary and Results
The query is used to encode a string using the SHA-1 hash. The hash
generators MD5,
SHA-1, and
SHA-256 are, for example, useful
for encoding passwords or representing other strings in the system as
hashed values.
SHA-256 Hash Multiple Fields
SHA-256 hash multiple fields using the crypto:sha256() function
Query
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crypto:sha256(field=[a,b,c])
Introduction
In this example, the crypto:sha256() function is
used to hash the fields a,b,c
and return the result into a field named
_sha256.
Step-by-Step
Starting with the source repository events.
logscale
crypto:sha256(field=[a,b,c])
Performs a cryptographic SHA256-hashing of
a,b,c. The
field argument can be omitted to write:
crypto:sha1([a,b,c])
Event Result set.
Summary and Results
The query is used to encode a string using the SHA-256 hash. When called
with multiple values, crypto:sha256() function
creates a single SHA-256 sum from the combined value of the supplied
fields. Combining fields in this way and converting to an SHa-256 can be
an effective method of creating a unique ID for a given fieldset which
could be used to identify a specific event type. The SHA-256 is
reproducible (for example, supplying the same values will produce the same
SHA-256 sum), and so it can sometimes be an effective method of creating
unique identifier or lookup fields for a join()
across two different datasets.
SHA-256 Hash a Field With a Given Value
SHA-256 hash a field with a given value using the crypto:sha256() function
Query
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a:="Hello, world!"|crypto:sha256(a)
Introduction
In this example, the crypto:sha256() function is
used to hash the field a with
value Hello, world! and convert
the result into _sha256.
Step-by-Step
Starting with the source repository events.
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a:="Hello, world!"
Assigns the value Hello, world! to
the field a.
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|crypto:sha256(a)
Performs a cryptographic SHA-256-hashing of
a:= "Hello, world!". The output
value would be _sha256 =
"315f5bdb76d078c43b8ac0064e4a0164612b1fce77c869345bfc94c75894edd3"
Event Result set.
Summary and Results
The query is used to encode a string using the SHA-256 hash. The hash
generators MD5,
SHA-1, and
SHA-256 are, for example, useful
for encoding passwords or representing other strings in the system as
hashed values.
