SHA · The Julia Language
Description: Documentation for The Julia Language.

# SHA

## SHA functions

Usage is very straightforward:

    julia> using SHA

    julia> bytes2hex(sha256("test"))
    "9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08"

Each exported function (at the time of this writing, SHA-1, SHA-2 224, 256, 384 and 512, and SHA-3 224, 256, 384 and 512 functions are implemented) takes in either an `AbstractVector{UInt8}`, an `AbstractString` or an `IO` object. This makes it trivial to checksum a file:

    shell> cat /tmp/test.txt
    test
    julia> using SHA

    julia> open("/tmp/test.txt") do f
               sha2_256(f)
           end
    32-element Vector{UInt8}:
     0x9f
     0x86
     0xd0
     0x81
     0x88
     0x4c
     0x7d
     0x65
        ⋮
     0x5d
     0x6c
     0x15
     0xb0
     0xf0
     0x0a
     0x08

### All SHA functions

Due to the colloquial usage of `sha256` to refer to `sha2_256`, convenience functions are provided, mapping `shaxxx()` function calls to `sha2_xxx()`. For SHA-3, no such colloquialisms exist and the user must use the full `sha3_xxx()` names.

`shaxxx()` takes `AbstractString` and array-like objects (`NTuple` and `Vector`) with elements of type `UInt8`.

SHA-1

`SHA.sha1` — Function

    sha1(data)

Hash data using the `sha1` algorithm and return the resulting digest. See also `SHA1_CTX`.

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    sha1(io::IO)

Hash data from io using `sha1` algorithm.

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SHA-2

`SHA.sha224` — Function

    sha224(data)

Hash data using the `sha224` algorithm and return the resulting digest. See also `SHA2_224_CTX`.

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    sha224(io::IO)

Hash data from io using `sha224` algorithm.

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`SHA.sha256` — Function

    sha256(data)

Hash data using the `sha256` algorithm and return the resulting digest. See also `SHA2_256_CTX`.

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    sha256(io::IO)

Hash data from io using `sha256` algorithm.

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`SHA.sha384` — Function

    sha384(data)

Hash data using the `sha384` algorithm and return the resulting digest. See also `SHA2_384_CTX`.

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    sha384(io::IO)

Hash data from io using `sha384` algorithm.

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`SHA.sha512` — Function

    sha512(data)

Hash data using the `sha512` algorithm and return the resulting digest. See also `SHA2_512_CTX`.

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    sha512(io::IO)

Hash data from io using `sha512` algorithm.

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`SHA.sha2_224` — Function

    sha2_224(data)

Hash data using the `sha2_224` algorithm and return the resulting digest. See also `SHA2_224_CTX`.

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    sha2_224(io::IO)

Hash data from io using `sha2_224` algorithm.

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`SHA.sha2_256` — Function

    sha2_256(data)

Hash data using the `sha2_256` algorithm and return the resulting digest. See also `SHA2_256_CTX`.

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    sha2_256(io::IO)

Hash data from io using `sha2_256` algorithm.

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`SHA.sha2_384` — Function

    sha2_384(data)

Hash data using the `sha2_384` algorithm and return the resulting digest. See also `SHA2_384_CTX`.

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    sha2_384(io::IO)

Hash data from io using `sha2_384` algorithm.

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`SHA.sha2_512` — Function

    sha2_512(data)

Hash data using the `sha2_512` algorithm and return the resulting digest. See also `SHA2_512_CTX`.

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    sha2_512(io::IO)

Hash data from io using `sha2_512` algorithm.

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`SHA.sha2_512_224` — Function

    sha2_512_224(data)

Hash data using the `sha2_512_224` algorithm and return the resulting digest. See also `SHA2_512_224_CTX`.

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    sha2_512_224(io::IO)

Hash data from io using `sha2_512_224` algorithm.

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`SHA.sha2_512_256` — Function

    sha2_512_256(data)

Hash data using the `sha2_512_256` algorithm and return the resulting digest. See also `SHA2_512_256_CTX`.

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    sha2_512_256(io::IO)

Hash data from io using `sha2_512_256` algorithm.

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SHA-3

`SHA.sha3_224` — Function

    sha3_224(data)

Hash data using the `sha3_224` algorithm and return the resulting digest. See also `SHA3_224_CTX`.

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    sha3_224(io::IO)

Hash data from io using `sha3_224` algorithm.

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`SHA.sha3_256` — Function

    sha3_256(data)

Hash data using the `sha3_256` algorithm and return the resulting digest. See also `SHA3_256_CTX`.

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    sha3_256(io::IO)

Hash data from io using `sha3_256` algorithm.

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`SHA.sha3_384` — Function

    sha3_384(data)

Hash data using the `sha3_384` algorithm and return the resulting digest. See also `SHA3_384_CTX`.

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    sha3_384(io::IO)

Hash data from io using `sha3_384` algorithm.

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`SHA.sha3_512` — Function

    sha3_512(data)

Hash data using the `sha3_512` algorithm and return the resulting digest. See also `SHA3_512_CTX`.

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    sha3_512(io::IO)

Hash data from io using `sha3_512` algorithm.

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## Working with context

To create a hash from multiple items the `SHAX_XXX_CTX()` types can be used to create a stateful hash object that is updated with `update!` and finalized with `digest!`

    julia> using SHA

    julia> ctx = SHA2_256_CTX()
    SHA2 256-bit hash state

    julia> update!(ctx, b"some data")
    0x0000000000000009

    julia> update!(ctx, b"some more data")
    0x0000000000000017

    julia> digest!(ctx)
    32-element Vector{UInt8}:
     0xbe
     0xcf
     0x23
     0xda
     0xaf
     0x02
     0xf7
     0xa3
     0x57
     0x92
        ⋮
     0x89
     0x4f
     0x59
     0xd8
     0xb3
     0xb4
     0x81
     0x8b
     0xc5

Note that, at the time of this writing, the SHA3 code is not optimized, and as such is roughly an order of magnitude slower than SHA2.

`SHA.update!` — Function

    update!(context, data[, datalen])

Update the SHA context with the bytes in data. See also `digest!` for finalizing the hash.

Examples

    julia> ctx = SHA1_CTX()
    SHA1 hash state

    julia> update!(ctx, b"data to to be hashed")

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`SHA.digest!` — Function

    digest!(context)

Finalize the SHA context and return the hash as array of bytes (Vector{Uint8}). Updating the context after calling `digest!` on it will error.

Examples

    julia> ctx = SHA1_CTX()
    SHA1 hash state

    julia> update!(ctx, b"data to to be hashed")

    julia> digest!(ctx)
    20-element Vector{UInt8}:
     0x83
     0xe4
     ⋮
     0x89
     0xf5

    julia> update!(ctx, b"more data")
    ERROR: Cannot update CTX after `digest!` has been called on it
    [...]

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### All SHA context types

SHA-1

`SHA.SHA1_CTX` — Type

    SHA1_CTX()

Construct an empty SHA1 context.

source

SHA-2

Convenience types are also provided, where `SHAXXX_CTX` is a type alias for `SHA2_XXX_CTX`.

`SHA.SHA224_CTX` — Type

    SHA2_224_CTX()

Construct an empty SHA2_224 context.

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`SHA.SHA256_CTX` — Type

    SHA2_256_CTX()

Construct an empty SHA2_256 context.

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`SHA.SHA384_CTX` — Type

    SHA2_384()

Construct an empty SHA2_384 context.

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`SHA.SHA512_CTX` — Type

    SHA2_512_CTX()

Construct an empty SHA2_512 context.

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`SHA.SHA2_224_CTX` — Type

    SHA2_224_CTX()

Construct an empty SHA2_224 context.

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`SHA.SHA2_256_CTX` — Type

    SHA2_256_CTX()

Construct an empty SHA2_256 context.

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`SHA.SHA2_384_CTX` — Type

    SHA2_384()

Construct an empty SHA2_384 context.

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`SHA.SHA2_512_CTX` — Type

    SHA2_512_CTX()

Construct an empty SHA2_512 context.

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`SHA.SHA2_512_224_CTX` — Type

    SHA2_512_224_CTX()

Construct an empty SHA2_512/224 context and set the initial hash value.

For the source of the initial value, refer to FIPS 180-4, 5.3.6.1 SHA-512/224

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`SHA.SHA2_512_256_CTX` — Type

    SHA2_512_256_CTX()

Construct an empty SHA2_512/256 context and set the initial hash value.

For the source of the initial value, refer to FIPS 180-4, 5.3.6.2 SHA-512/256

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SHA-3

`SHA.SHA3_224_CTX` — Type

    SHA3_224_CTX()

Construct an empty SHA3_224 context.

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`SHA.SHA3_256_CTX` — Type

    SHA3_256_CTX()

Construct an empty SHA3_256 context.

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`SHA.SHA3_384_CTX` — Type

    SHA3_384_CTX()

Construct an empty SHA3_384 context.

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`SHA.SHA3_512_CTX` — Type

    SHA3_512_CTX()

Construct an empty SHA3_512 context.

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## HMAC functions

    julia> using SHA

    julia> key = collect(codeunits("key_string"))
    10-element Vector{UInt8}:
     0x6b
     0x65
     0x79
     0x5f
     0x73
     0x74
     0x72
     0x69
     0x6e
     0x67

    julia> bytes2hex(hmac_sha3_256(key, "test-message"))
    "bc49a6f2aa29b27ee5ed1e944edd7f3d153e8a01535d98b5e24dac9a589a6248"

To create a hash from multiple items, the `HMAC_CTX()` types can be used to create a stateful hash object that is updated with `update!` and finalized with `digest!`.

    julia> using SHA

    julia> key = collect(codeunits("key_string"))
    10-element Vector{UInt8}:
     0x6b
     0x65
     0x79
     0x5f
     0x73
     0x74
     0x72
     0x69
     0x6e
     0x67

    julia> ctx = HMAC_CTX(SHA3_256_CTX(), key);

    julia> update!(ctx, b"test-")
    0x0000000000000000000000000000008d

    julia> update!(ctx, b"message")
    0x00000000000000000000000000000094

    julia> bytes2hex(digest!(ctx))
    "bc49a6f2aa29b27ee5ed1e944edd7f3d153e8a01535d98b5e24dac9a589a6248"

### All HMAC functions

HMAC context type

`SHA.HMAC_CTX` — Type

    HMAC_CTX(ctx::CTX, key::Vector{UInt8}) where {CTX<:SHA_CTX}

Construct an empty HMAC_CTX context.

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SHA-1

`SHA.hmac_sha1` — Function

    hmac_sha1(key, data)

Hash data using the `sha1` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha1(key, io::IO)

Hash data from `io` with the passed key using `sha1` algorithm.

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SHA-2

`SHA.hmac_sha224` — Function

    hmac_sha224(key, data)

Hash data using the `sha224` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha224(key, io::IO)

Hash data from `io` with the passed key using `sha224` algorithm.

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`SHA.hmac_sha256` — Function

    hmac_sha256(key, data)

Hash data using the `sha256` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha256(key, io::IO)

Hash data from `io` with the passed key using `sha256` algorithm.

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`SHA.hmac_sha384` — Function

    hmac_sha384(key, data)

Hash data using the `sha384` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha384(key, io::IO)

Hash data from `io` with the passed key using `sha384` algorithm.

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`SHA.hmac_sha512` — Function

    hmac_sha512(key, data)

Hash data using the `sha512` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha512(key, io::IO)

Hash data from `io` with the passed key using `sha512` algorithm.

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`SHA.hmac_sha2_224` — Function

    hmac_sha2_224(key, data)

Hash data using the `sha2_224` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha2_224(key, io::IO)

Hash data from `io` with the passed key using `sha2_224` algorithm.

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`SHA.hmac_sha2_256` — Function

    hmac_sha2_256(key, data)

Hash data using the `sha2_256` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha2_256(key, io::IO)

Hash data from `io` with the passed key using `sha2_256` algorithm.

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`SHA.hmac_sha2_384` — Function

    hmac_sha2_384(key, data)

Hash data using the `sha2_384` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha2_384(key, io::IO)

Hash data from `io` with the passed key using `sha2_384` algorithm.

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`SHA.hmac_sha2_512` — Function

    hmac_sha2_512(key, data)

Hash data using the `sha2_512` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha2_512(key, io::IO)

Hash data from `io` with the passed key using `sha2_512` algorithm.

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SHA-3

`SHA.hmac_sha3_224` — Function

    hmac_sha3_224(key, data)

Hash data using the `sha3_224` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha3_224(key, io::IO)

Hash data from `io` with the passed key using `sha3_224` algorithm.

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`SHA.hmac_sha3_256` — Function

    hmac_sha3_256(key, data)

Hash data using the `sha3_256` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha3_256(key, io::IO)

Hash data from `io` with the passed key using `sha3_256` algorithm.

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`SHA.hmac_sha3_384` — Function

    hmac_sha3_384(key, data)

Hash data using the `sha3_384` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha3_384(key, io::IO)

Hash data from `io` with the passed key using `sha3_384` algorithm.

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`SHA.hmac_sha3_512` — Function

    hmac_sha3_512(key, data)

Hash data using the `sha3_512` algorithm using the passed key. See also `HMAC_CTX`.

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    hmac_sha3_512(key, io::IO)

Hash data from `io` with the passed key using `sha3_512` algorithm.

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Theme

This document was generated with Documenter.jl version 1.17.0 on Thursday 9 April 2026. Using Julia version 1.12.6.