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DsaSignPreHash Method

Generate a DSA signature over a pre-hashed message.

Namespace: CryptoSysPQC
Assembly: diCrSysPQCNet (in diCrSysPQCNet.dll) Version: 1.0.0.0 (1.0.0.0)
Syntax
Copy
public static byte[] SignPreHash(
	DsaAlg alg,
	byte[] msg,
	DsaPreHashAlg hashAlg,
	byte[] sk,
	DsaSigOpts opts = DsaSigOpts.Default,
	byte[] context = null,
	string paramstr = ""
)

Parameters

alg  DsaAlg
DSA signature algorithm.
msg  Byte
Hash digest of message to be signed PH_M = PH(M).
hashAlg  DsaPreHashAlg
Pre-hash function used to create hash digest.
sk  Byte
Private key.
opts  DsaSigOpts  (Optional)
Signature options.
context  Byte  (Optional)
Optional context string in byte array (maximum 255 bytes).
paramstr  String  (Optional)
Optional parameters string.

Return Value

Byte
Signature in a byte array.
Remarks
Use paramstr to pass known test random material encoded in hexadecimal [default = "" = add fresh randomness if in hedged mode]. For SLH-DSA this must represent exactly n bytes (16/24/32 bytes) and for ML-DSA exactly 32 bytes. For the pre-hash version, the hash digest of the message is passed instead of the message itself. Caller is responsible for computing the hash digest independently prior to input. The hash function used must be identifed in the hashAlg parameter.

For ML-DSA, the private key sk may be passed in expanded form (2560|4032|4896 bytes) or as a 32-byte seed. The key form is detected automatically by its length.

See Also