crypto

package standard library
go1.23.4 Latest Latest
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 Go to latest Published: Dec 3, 2024 License: BSD-3-Clause Imports: 3 Imported by: 42,809

Documentation

Overview

Package crypto collects common cryptographic constants.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func RegisterHash 

func RegisterHash(h Hash, f func() hash.Hash)

RegisterHash registers a function that returns a new instance of the given hash function. This is intended to be called from the init function in packages that implement hash functions.

Types

type Decrypter added in go1.5 

type Decrypter interface {
	// Public returns the public key corresponding to the opaque,
	// private key.
	Public() PublicKey

	// Decrypt decrypts msg. The opts argument should be appropriate for
	// the primitive used. See the documentation in each implementation for
	// details.
	Decrypt(rand io.Reader, msg []byte, opts DecrypterOpts) (plaintext []byte, err error)
}

Decrypter is an interface for an opaque private key that can be used for asymmetric decryption operations. An example would be an RSA key kept in a hardware module.

type DecrypterOpts added in go1.5 

type DecrypterOpts any

type Hash 

type Hash uint

Hash identifies a cryptographic hash function that is implemented in another package. 

const (
	MD4         Hash = 1 + iota // import golang.org/x/crypto/md4
	MD5                         // import crypto/md5
	SHA1                        // import crypto/sha1
	SHA224                      // import crypto/sha256
	SHA256                      // import crypto/sha256
	SHA384                      // import crypto/sha512
	SHA512                      // import crypto/sha512
	MD5SHA1                     // no implementation; MD5+SHA1 used for TLS RSA
	RIPEMD160                   // import golang.org/x/crypto/ripemd160
	SHA3_224                    // import golang.org/x/crypto/sha3
	SHA3_256                    // import golang.org/x/crypto/sha3
	SHA3_384                    // import golang.org/x/crypto/sha3
	SHA3_512                    // import golang.org/x/crypto/sha3
	SHA512_224                  // import crypto/sha512
	SHA512_256                  // import crypto/sha512
	BLAKE2s_256                 // import golang.org/x/crypto/blake2s
	BLAKE2b_256                 // import golang.org/x/crypto/blake2b
	BLAKE2b_384                 // import golang.org/x/crypto/blake2b
	BLAKE2b_512                 // import golang.org/x/crypto/blake2b

)

func (Hash) Available 

func (h Hash) Available() bool

Available reports whether the given hash function is linked into the binary.

func (Hash) HashFunc added in go1.4 

func (h Hash) HashFunc() Hash

HashFunc simply returns the value of h so that Hash implements SignerOpts.

func (Hash) New 

func (h Hash) New() hash.Hash

New returns a new hash.Hash calculating the given hash function. New panics if the hash function is not linked into the binary.

func (Hash) Size 

func (h Hash) Size() int

Size returns the length, in bytes, of a digest resulting from the given hash function. It doesn't require that the hash function in question be linked into the program.

func (Hash) String added in go1.15 

func (h Hash) String() string

type PrivateKey 

type PrivateKey any

PrivateKey represents a private key using an unspecified algorithm.

Although this type is an empty interface for backwards compatibility reasons, all private key types in the standard library implement the following interface 

interface{
    Public() crypto.PublicKey
    Equal(x crypto.PrivateKey) bool
}

as well as purpose-specific interfaces such as Signer and Decrypter, which can be used for increased type safety within applications.

type PublicKey added in go1.2 

type PublicKey any

PublicKey represents a public key using an unspecified algorithm.

Although this type is an empty interface for backwards compatibility reasons, all public key types in the standard library implement the following interface 

interface{
    Equal(x crypto.PublicKey) bool
}

which can be used for increased type safety within applications.

type Signer added in go1.4 

type Signer interface {
	// Public returns the public key corresponding to the opaque,
	// private key.
	Public() PublicKey

	// Sign signs digest with the private key, possibly using entropy from
	// rand. For an RSA key, the resulting signature should be either a
	// PKCS #1 v1.5 or PSS signature (as indicated by opts). For an (EC)DSA
	// key, it should be a DER-serialised, ASN.1 signature structure.
	//
	// Hash implements the SignerOpts interface and, in most cases, one can
	// simply pass in the hash function used as opts. Sign may also attempt
	// to type assert opts to other types in order to obtain algorithm
	// specific values. See the documentation in each package for details.
	//
	// Note that when a signature of a hash of a larger message is needed,
	// the caller is responsible for hashing the larger message and passing
	// the hash (as digest) and the hash function (as opts) to Sign.
	Sign(rand io.Reader, digest []byte, opts SignerOpts) (signature []byte, err error)
}

Signer is an interface for an opaque private key that can be used for signing operations. For example, an RSA key kept in a hardware module.

type SignerOpts added in go1.4 

type SignerOpts interface {
	// HashFunc returns an identifier for the hash function used to produce
	// the message passed to Signer.Sign, or else zero to indicate that no
	// hashing was done.
	HashFunc() Hash
}

SignerOpts contains options for signing with a Signer.

Source Files

View all Source files

Directories

Path Synopsis
Package aes implements AES encryption (formerly Rijndael), as defined in U.S. Federal Information Processing Standards Publication 197.
 Package aes implements AES encryption (formerly Rijndael), as defined in U.S. Federal Information Processing Standards Publication 197.
Package cipher implements standard block cipher modes that can be wrapped around low-level block cipher implementations.
 Package cipher implements standard block cipher modes that can be wrapped around low-level block cipher implementations.
Package des implements the Data Encryption Standard (DES) and the Triple Data Encryption Algorithm (TDEA) as defined in U.S. Federal Information Processing Standards Publication 46-3.
 Package des implements the Data Encryption Standard (DES) and the Triple Data Encryption Algorithm (TDEA) as defined in U.S. Federal Information Processing Standards Publication 46-3.
Package dsa implements the Digital Signature Algorithm, as defined in FIPS 186-3.
 Package dsa implements the Digital Signature Algorithm, as defined in FIPS 186-3.
Package ecdh implements Elliptic Curve Diffie-Hellman over NIST curves and Curve25519.
 Package ecdh implements Elliptic Curve Diffie-Hellman over NIST curves and Curve25519.
Package ecdsa implements the Elliptic Curve Digital Signature Algorithm, as defined in FIPS 186-4 and SEC 1, Version 2.0.
 Package ecdsa implements the Elliptic Curve Digital Signature Algorithm, as defined in FIPS 186-4 and SEC 1, Version 2.0.
Package ed25519 implements the Ed25519 signature algorithm.
 Package ed25519 implements the Ed25519 signature algorithm.
Package elliptic implements the standard NIST P-224, P-256, P-384, and P-521 elliptic curves over prime fields.
 Package elliptic implements the standard NIST P-224, P-256, P-384, and P-521 elliptic curves over prime fields.
Package hmac implements the Keyed-Hash Message Authentication Code (HMAC) as defined in U.S. Federal Information Processing Standards Publication 198.
 Package hmac implements the Keyed-Hash Message Authentication Code (HMAC) as defined in U.S. Federal Information Processing Standards Publication 198.
internal
alias
Package alias implements memory aliasing tests.
 Package alias implements memory aliasing tests.
bigmod
boring
Package boring provides access to BoringCrypto implementation functions.
 Package boring provides access to BoringCrypto implementation functions.
boring/bbig
boring/bcache
Package bcache implements a GC-friendly cache (see Cache) for BoringCrypto.
 Package bcache implements a GC-friendly cache (see Cache) for BoringCrypto.
boring/sig
Package sig holds “code signatures” that can be called and will result in certain code sequences being linked into the final binary.
 Package sig holds “code signatures” that can be called and will result in certain code sequences being linked into the final binary.
cryptotest
edwards25519
Package edwards25519 implements group logic for the twisted Edwards curve
 Package edwards25519 implements group logic for the twisted Edwards curve
edwards25519/field
Package field implements fast arithmetic modulo 2^255-19.
 Package field implements fast arithmetic modulo 2^255-19.
hpke
mlkem768
Package mlkem768 implements the quantum-resistant key encapsulation method ML-KEM (formerly known as Kyber).
 Package mlkem768 implements the quantum-resistant key encapsulation method ML-KEM (formerly known as Kyber).
nistec
Package nistec implements the NIST P elliptic curves from FIPS 186-4.
 Package nistec implements the NIST P elliptic curves from FIPS 186-4.
nistec/fiat
randutil
Package randutil contains internal randomness utilities for various crypto packages.
 Package randutil contains internal randomness utilities for various crypto packages.
Package md5 implements the MD5 hash algorithm as defined in RFC 1321.
 Package md5 implements the MD5 hash algorithm as defined in RFC 1321.
Package rand implements a cryptographically secure random number generator.
 Package rand implements a cryptographically secure random number generator.
Package rc4 implements RC4 encryption, as defined in Bruce Schneier's Applied Cryptography.
 Package rc4 implements RC4 encryption, as defined in Bruce Schneier's Applied Cryptography.
Package rsa implements RSA encryption as specified in PKCS #1 and RFC 8017.
 Package rsa implements RSA encryption as specified in PKCS #1 and RFC 8017.
Package sha1 implements the SHA-1 hash algorithm as defined in RFC 3174.
 Package sha1 implements the SHA-1 hash algorithm as defined in RFC 3174.
Package sha256 implements the SHA224 and SHA256 hash algorithms as defined in FIPS 180-4.
 Package sha256 implements the SHA224 and SHA256 hash algorithms as defined in FIPS 180-4.
Package sha512 implements the SHA-384, SHA-512, SHA-512/224, and SHA-512/256 hash algorithms as defined in FIPS 180-4.
 Package sha512 implements the SHA-384, SHA-512, SHA-512/224, and SHA-512/256 hash algorithms as defined in FIPS 180-4.
Package subtle implements functions that are often useful in cryptographic code but require careful thought to use correctly.
 Package subtle implements functions that are often useful in cryptographic code but require careful thought to use correctly.
Package tls partially implements TLS 1.2, as specified in RFC 5246, and TLS 1.3, as specified in RFC 8446.
 Package tls partially implements TLS 1.2, as specified in RFC 5246, and TLS 1.3, as specified in RFC 8446.
Package x509 implements a subset of the X.509 standard.
 Package x509 implements a subset of the X.509 standard.
internal/macos
Package macOS provides cgo-less wrappers for Core Foundation and Security.framework, similarly to how package syscall provides access to libSystem.dylib.
 Package macOS provides cgo-less wrappers for Core Foundation and Security.framework, similarly to how package syscall provides access to libSystem.dylib.
pkix
Package pkix contains shared, low level structures used for ASN.1 parsing and serialization of X.509 certificates, CRL and OCSP.
 Package pkix contains shared, low level structures used for ASN.1 parsing and serialization of X.509 certificates, CRL and OCSP.

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