Rfc3161TimestampRequest.CreateFromData Method

Definition

Namespace:

System.Security.Cryptography.Pkcs

Assembly:

System.Security.Cryptography.Pkcs.dll

Source:

Rfc3161TimestampRequest.cs

Creates a timestamp request by hashing the provided data with a specified algorithm.

public static System.Security.Cryptography.Pkcs.Rfc3161TimestampRequest CreateFromData (ReadOnlySpan<byte> data, System.Security.Cryptography.HashAlgorithmName hashAlgorithm, System.Security.Cryptography.Oid? requestedPolicyId = default, ReadOnlyMemory<byte>? nonce = default, bool requestSignerCertificates = false, System.Security.Cryptography.X509Certificates.X509ExtensionCollection? extensions = default);

static member CreateFromData : ReadOnlySpan<byte> * System.Security.Cryptography.HashAlgorithmName * System.Security.Cryptography.Oid * Nullable<ReadOnlyMemory<byte>> * bool * System.Security.Cryptography.X509Certificates.X509ExtensionCollection -> System.Security.Cryptography.Pkcs.Rfc3161TimestampRequest

Public Shared Function CreateFromData (data As ReadOnlySpan(Of Byte), hashAlgorithm As HashAlgorithmName, Optional requestedPolicyId As Oid = Nothing, Optional nonce As Nullable(Of ReadOnlyMemory(Of Byte)) = Nothing, Optional requestSignerCertificates As Boolean = false, Optional extensions As X509ExtensionCollection = Nothing) As Rfc3161TimestampRequest

Parameters

data

ReadOnlySpan<Byte>

The data to timestamp, which will be hashed by this method.

hashAlgorithm

HashAlgorithmName

The hash algorithm to use with this timestamp request.

requestedPolicyId

Oid

The Object Identifier (OID) for a timestamp policy the Timestamp Authority (TSA) should use, or null to express no preference.

nonce

Nullable<ReadOnlyMemory<Byte>>

An optional nonce (number used once) to uniquely identify this request to pair it with the response. The value is interpreted as an unsigned big-endian integer and may be normalized to the encoding format.

requestSignerCertificates

Boolean

true to indicate the Timestamp Authority (TSA) must include the signing certificate in the issued timestamp token; otherwise, false.

extensions

X509ExtensionCollection

An optional collection of extensions to include in the request.

Returns

Rfc3161TimestampRequest

An Rfc3161TimestampRequest representing the chosen values.

Exceptions

ArgumentException

hashAlgorithm.Name is null or Empty.

CryptographicException

hashAlgorithm is not a known hash algorithm.

Remarks

Cryptographic timestamps are always applied to a combination of the hash of data and the algorithm identifier for the hash algorithm used to hash the data. This method is a convenient alternative to CreateFromHash(ReadOnlyMemory<Byte>, HashAlgorithmName, Oid, Nullable<ReadOnlyMemory<Byte>>, Boolean, X509ExtensionCollection) when the data has not already been hashed.

The nonce value in this method is treated as an unsigned, big-endian integer. This method normalizes the input to a BER INTEGER encoding before assigning the nonce value. The normalized value is returned by the GetNonce() method.

See also

• CreateFromHash(ReadOnlyMemory<Byte>, HashAlgorithmName, Oid, Nullable<ReadOnlyMemory<Byte>>, Boolean, X509ExtensionCollection)
• CreateFromSignerInfo(SignerInfo, HashAlgorithmName, Oid, Nullable<ReadOnlyMemory<Byte>>, Boolean, X509ExtensionCollection)