package dsa

Import Path
	crypto/dsa (on go.dev)

Dependency Relation
	imports 4 packages, and imported by one package

Involved Source Files

	  d dsa.go
		Package dsa implements the Digital Signature Algorithm, as defined in FIPS 186-3.
		
		The DSA operations in this package are not implemented using constant-time algorithms.
		
		Deprecated: DSA is a legacy algorithm, and modern alternatives such as
		Ed25519 (implemented by package crypto/ed25519) should be used instead. Keys
		with 1024-bit moduli (L1024N160 parameters) are cryptographically weak, while
		bigger keys are not widely supported. Note that FIPS 186-5 no longer approves
		DSA for signature generation.
Package-Level Type Names (total 4)

	/* sort by: alphabet | popularity */
	 type Parameters (struct)
		Parameters represents the domain parameters for a key. These parameters can
		be shared across many keys. The bit length of Q must be a multiple of 8.

		Fields (total 3)
			G *big.Int
			P *big.Int
			Q *big.Int
		As Inputs Of (at least one exported)
			func GenerateParameters(params *Parameters, rand io.Reader, sizes ParameterSizes) error

	 type ParameterSizes int (basic type)
		ParameterSizes is an enumeration of the acceptable bit lengths of the primes
		in a set of DSA parameters. See FIPS 186-3, section 4.2.

		As Inputs Of (at least one exported)
			func GenerateParameters(params *Parameters, rand io.Reader, sizes ParameterSizes) error
		As Types Of (total 4)
			const L1024N160
			const L2048N224
			const L2048N256
			const L3072N256

	 type PrivateKey (struct)
		PrivateKey represents a DSA private key.

		Fields (total 7)
			PublicKey PublicKey
			PublicKey.Parameters Parameters
			PublicKey.Parameters.G *big.Int
			PublicKey.Parameters.P *big.Int
			PublicKey.Parameters.Q *big.Int
			PublicKey.Y *big.Int
			X *big.Int
		As Inputs Of (at least 2)
			func GenerateKey(priv *PrivateKey, rand io.Reader) error
			func Sign(rand io.Reader, priv *PrivateKey, hash []byte) (r, s *big.Int, err error)

	 type PublicKey (struct)
		PublicKey represents a DSA public key.

		Fields (total 5)
			Parameters Parameters
			Parameters.G *big.Int
			Parameters.P *big.Int
			Parameters.Q *big.Int
			Y *big.Int
		As Inputs Of (at least one exported)
			func Verify(pub *PublicKey, hash []byte, r, s *big.Int) bool


Package-Level Functions (total 4)

	 func GenerateKey(priv *PrivateKey, rand io.Reader) error
		GenerateKey generates a public&private key pair. The Parameters of the
		[PrivateKey] must already be valid (see [GenerateParameters]).

	 func GenerateParameters(params *Parameters, rand io.Reader, sizes ParameterSizes) error
		GenerateParameters puts a random, valid set of DSA parameters into params.
		This function can take many seconds, even on fast machines.

	 func Sign(rand io.Reader, priv *PrivateKey, hash []byte) (r, s *big.Int, err error)
		Sign signs an arbitrary length hash (which should be the result of hashing a
		larger message) using the private key, priv. It returns the signature as a
		pair of integers. The security of the private key depends on the entropy of
		rand.
		
		Note that FIPS 186-3 section 4.6 specifies that the hash should be truncated
		to the byte-length of the subgroup. This function does not perform that
		truncation itself.
		
		Be aware that calling Sign with an attacker-controlled [PrivateKey] may
		require an arbitrary amount of CPU.

	 func Verify(pub *PublicKey, hash []byte, r, s *big.Int) bool
		Verify verifies the signature in r, s of hash using the public key, pub. It
		reports whether the signature is valid.
		
		Note that FIPS 186-3 section 4.6 specifies that the hash should be truncated
		to the byte-length of the subgroup. This function does not perform that
		truncation itself.


Package-Level Variables (only one)

	  var ErrInvalidPublicKey error
		ErrInvalidPublicKey results when a public key is not usable by this code.
		FIPS is quite strict about the format of DSA keys, but other code may be
		less so. Thus, when using keys which may have been generated by other code,
		this error must be handled.


Package-Level Constants (total 4)

	const L1024N160 ParameterSizes = 0
	const L2048N224 ParameterSizes = 1
	const L2048N256 ParameterSizes = 2
	const L3072N256 ParameterSizes = 3

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