Online JSON Web Token Builder, for creating signed test JWTs, including standard and custom claims; built by Jamie Kurtz Online JWT Builder - Jamie Kurtz Toggle navigation JSON Web Token Builder. This means there is no way to fully guarantee Auth0 generated the JWT as any client or API with the secret could generate a validly signed JWT. On the other hand, RS256 generates an asymmetric signature, which means a private key must be used to sign the JWT and a different public key must be used to verify the signature.
-->Definition
Computes a Hash-based Message Authentication Code (HMAC) by using the SHA256 hash function.
- Attributes
Examples
The following example shows how to sign a file by using the HMACSHA256 object and then how to verify the file.
Remarks
HMACSHA256 is a type of keyed hash algorithm that is constructed from the SHA-256 hash function and used as a Hash-based Message Authentication Code (HMAC). The HMAC process mixes a secret key with the message data, hashes the result with the hash function, mixes that hash value with the secret key again, and then applies the hash function a second time. The output hash is 256 bits in length.
An HMAC can be used to determine whether a message sent over an insecure channel has been tampered with, provided that the sender and receiver share a secret key. The sender computes the hash value for the original data and sends both the original data and hash value as a single message. The receiver recalculates the hash value on the received message and checks that the computed HMAC matches the transmitted HMAC.
Any change to the data or the hash value results in a mismatch, because knowledge of the secret key is required to change the message and reproduce the correct hash value. Therefore, if the original and computed hash values match, the message is authenticated.
HMACSHA256 accepts keys of any size, and produces a hash sequence 256 bits in length.
Constructors
| HMACSHA256() | Initializes a new instance of the HMACSHA256 class with a randomly generated key. |
| HMACSHA256(Byte[]) | Initializes a new instance of the HMACSHA256 class with the specified key data. |
Fields
| HashSizeValue | Represents the size, in bits, of the computed hash code. (Inherited from HashAlgorithm) |
| HashValue | Represents the value of the computed hash code. (Inherited from HashAlgorithm) |
| KeyValue | The key to use in the hash algorithm. (Inherited from KeyedHashAlgorithm) |
| State | Represents the state of the hash computation. (Inherited from HashAlgorithm) |
Properties
| BlockSizeValue | Gets or sets the block size to use in the hash value. (Inherited from HMAC) |
| CanReuseTransform | Gets a value indicating whether the current transform can be reused. (Inherited from HashAlgorithm) |
| CanTransformMultipleBlocks | When overridden in a derived class, gets a value indicating whether multiple blocks can be transformed. (Inherited from HashAlgorithm) |
| Hash | Gets the value of the computed hash code. (Inherited from HashAlgorithm) |
| HashName | Gets or sets the name of the hash algorithm to use for hashing. (Inherited from HMAC) |
| HashSize | Gets the size, in bits, of the computed HMAC. |
| InputBlockSize | When overridden in a derived class, gets the input block size. (Inherited from HashAlgorithm) |
| Key | Gets or sets the key to use in the HMAC calculation. |
| OutputBlockSize | When overridden in a derived class, gets the output block size. (Inherited from HashAlgorithm) |
Methods
| Clear() | Releases all resources used by the HashAlgorithm class. (Inherited from HashAlgorithm) |
| ComputeHash(Byte[]) | Computes the hash value for the specified byte array. (Inherited from HashAlgorithm) |
| ComputeHash(Byte[], Int32, Int32) | Computes the hash value for the specified region of the specified byte array. (Inherited from HashAlgorithm) |
| ComputeHash(Stream) | Computes the hash value for the specified Stream object. (Inherited from HashAlgorithm) |
| ComputeHashAsync(Stream, CancellationToken) | (Inherited from HashAlgorithm) |
| Dispose() | Releases all resources used by the current instance of the HashAlgorithm class. (Inherited from HashAlgorithm) |
| Dispose(Boolean) | Releases the unmanaged resources used by the HMACSHA256 and optionally releases the managed resources. |
| Equals(Object) | Determines whether the specified object is equal to the current object. (Inherited from Object) |
| GetHashCode() | Serves as the default hash function. (Inherited from Object) |
| GetType() | Gets the Type of the current instance. (Inherited from Object) |
| HashCore(Byte[], Int32, Int32) | Routes data written to the object into the HMAC algorithm for computing the HMAC. |
| HashCore(ReadOnlySpan<Byte>) | Routes data written to the object into the HMAC algorithm for computing the HMAC. |
| HashFinal() | Finalizes the HMAC computation after the last data is processed by the algorithm. |
| Initialize() | Resets the hash algorithm to its initial state. |
| MemberwiseClone() | Creates a shallow copy of the current Object. (Inherited from Object) |
| ToString() | Returns a string that represents the current object. (Inherited from Object) |
| TransformBlock(Byte[], Int32, Int32, Byte[], Int32) | Computes the hash value for the specified region of the input byte array and copies the specified region of the input byte array to the specified region of the output byte array. (Inherited from HashAlgorithm) |
| TransformFinalBlock(Byte[], Int32, Int32) | Computes the hash value for the specified region of the specified byte array. (Inherited from HashAlgorithm) |
| TryComputeHash(ReadOnlySpan<Byte>, Span<Byte>, Int32) | Attempts to compute the hash value for the specified byte array. (Inherited from HashAlgorithm) |
| TryHashFinal(Span<Byte>, Int32) | Attempts to finalize the HMAC computation after the last data is processed by the HMAC algorithm. |
Explicit Interface Implementations
Generate Hs256 Key
| IDisposable.Dispose() | Releases the unmanaged resources used by the HashAlgorithm and optionally releases the managed resources. (Inherited from HashAlgorithm) |
Applies to
See also
TOP(jsrsasign) WIKI DOWNLOADS TUTORIALS API REFERENCE DEMOS
To use jsrsasign including jsjws on your browser, just include 'jsrsasign-latest-all-min.js' script as following:
JSON Web Token(JWT) generation is very similar to JSON Web Signature(JWS) generation since those difference is just payload. JWS generation is to create header and payload JSON object with necessary claims and then sign it.
Time in JWS/JWT, integer value for UNIX origin time since 1970 Jan 1 will be used. To specify time value KJUR.jws.IntData.get method is very useful.
Here is a sample for a JWT generation with HS256 signature algorithm:
When you want to sign JWT by your private key of public key cryptography, KEYUTIL.getKey method can be used to load PKCS#1 or PKCS#8 PEM formatted encrypted or plain private key. Here is an example:
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Please also see Online JWT generation/verification tool.
jwt.io site interoperability
jwt.io site can generate and verify HS256/384/512 JWT online and it uses old version of jsrsasign.However difference of way to specify password between jwt.io and jsrsasign may make some confusion.
jwt.io
- default password is an ascii string of 'secret'.
- it can accept password ascii string or Base64URL encoded data.
Java Generate Hs256 Key
jsrsasign
- Password encoding is detected automatically by default. If is hexadecimal string, then decode it as hexadecimal.
- It supports many way of password encoding: raw string, utf8 string, hexadecimal string, base64 string, base64url string.
In order to verify jsrsasign generated HS* JWT by jwt.io site, specify password as one of follows: