package gcm
Import Path
crypto/internal/fips140/aes/gcm (on go.dev)
Dependency Relation
imports 11 packages, and imported by 3 packages
Involved Source Files
cast.go
cmac.go
ctrkdf.go
gcm.go
gcm_asm.go
gcm_generic.go
gcm_nonces.go
ghash.go
gcm_amd64.s
Package-Level Type Names (total 5)
CMAC implements the CMAC mode from NIST SP 800-38B.
It is optimized for use in Counter KDF (SP 800-108r1) and XAES-256-GCM
(https://c2sp.org/XAES-256-GCM), rather than for exposing it to applications
as a stand-alone MAC.
(*CMAC) MAC(m []byte) [16]byte
func NewCMAC(b *aes.Block) *CMAC
CounterKDF implements a KDF in Counter Mode instantiated with CMAC-AES,
according to NIST SP 800-108 Revision 1 Update 1, Section 4.1.
It produces a 256-bit output, and accepts a 8-bit Label and a 96-bit Context.
It uses a counter of 16 bits placed before the fixed data. The fixed data is
the sequence Label || 0x00 || Context. The L field is omitted, since the
output key length is fixed.
It's optimized for use in XAES-256-GCM (https://c2sp.org/XAES-256-GCM),
rather than for exposing it to applications as a stand-alone KDF.
DeriveKey derives a key from the given label and context.
func NewCounterKDF(b *aes.Block) *CounterKDF
GCM represents a Galois Counter Mode with a specific key.
(*GCM) NonceSize() int
(*GCM) Open(dst, nonce, ciphertext, data []byte) ([]byte, error)
(*GCM) Overhead() int
(*GCM) Seal(dst, nonce, plaintext, data []byte) []byte
*GCM : crypto/cipher.AEAD
func New(cipher *aes.Block, nonceSize, tagSize int) (*GCM, error)
func SealWithRandomNonce(g *GCM, nonce, out, plaintext, additionalData []byte)
(*GCMWithCounterNonce) NonceSize() int
(*GCMWithCounterNonce) Open(dst, nonce, ciphertext, data []byte) ([]byte, error)
(*GCMWithCounterNonce) Overhead() int
Seal implements the [cipher.AEAD] interface, checking that the nonce prefix
is stable and that the counter is strictly increasing.
It is not safe for concurrent use.
*GCMWithCounterNonce : crypto/cipher.AEAD
func NewGCMForSSH(cipher *aes.Block) (*GCMWithCounterNonce, error)
func NewGCMForTLS12(cipher *aes.Block) (*GCMWithCounterNonce, error)
func NewGCMWithCounterNonce(cipher *aes.Block) (*GCMWithCounterNonce, error)
(*GCMWithXORCounterNonce) NonceSize() int
(*GCMWithXORCounterNonce) Open(dst, nonce, ciphertext, data []byte) ([]byte, error)
(*GCMWithXORCounterNonce) Overhead() int
Seal implements the [cipher.AEAD] interface, checking that the nonce prefix
is stable and that the counter is strictly increasing.
It is not safe for concurrent use.
SetNoncePrefixAndMask sets the fixed prefix and XOR mask for the nonces used
in Seal. It must be called before the first call to Seal.
The first 32 bits of nonce are used as the fixed prefix, and the last 64 bits
are used as the XOR mask.
Note that Seal expects the nonce to be already XOR'd with the mask. The mask
is provided here only to allow Seal to enforce that the counter is strictly
increasing.
*GCMWithXORCounterNonce : crypto/cipher.AEAD
func NewGCMForHPKE(cipher *aes.Block) (*GCMWithXORCounterNonce, error)
func NewGCMForQUIC(cipher *aes.Block, iv []byte) (*GCMWithXORCounterNonce, error)
func NewGCMForTLS13(cipher *aes.Block) (*GCMWithXORCounterNonce, error)
func NewGCMWithXORCounterNonce(cipher *aes.Block) (*GCMWithXORCounterNonce, error)
Package-Level Functions (total 12)
GHASH is exposed to allow crypto/cipher to implement non-AES GCM modes.
It is not allowed as a stand-alone operation in FIPS mode because it
is not ACVP tested.
NewCounterKDF creates a new CounterKDF with the given key.
NewGCMForHPKE returns a new AEAD that works like GCM, but enforces the
construction of nonces as specified in RFC 9180, Section 5.2.
This complies with FIPS 140-3 IG C.H Scenario 5.
NewGCMForQUIC returns a new AEAD that works like GCM, but enforces the
construction of nonces as specified in RFC 9001, Section 5.3.
Unlike in TLS 1.3, the QUIC nonce counter does not always start at zero, as
the packet number does not reset on key updates, so the XOR mask must be
provided explicitly instead of being learned on the first Seal call. Note
that the nonce passed to Seal must already be XOR'd with the IV, the IV is
provided here only to allow Seal to enforce that the counter is strictly
increasing.
This complies with FIPS 140-3 IG C.H Scenario 5.
NewGCMForSSH returns a new AEAD that works like GCM, but enforces the
construction of nonces as specified in RFC 5647.
This complies with FIPS 140-3 IG C.H Scenario 1.d.
NewGCMForTLS12 returns a new AEAD that works like GCM, but enforces the
construction of nonces as specified in RFC 5288, Section 3 and RFC 9325,
Section 7.2.1.
This complies with FIPS 140-3 IG C.H Scenario 1.a.
NewGCMForTLS13 returns a new AEAD that works like GCM, but enforces the
construction of nonces as specified in RFC 8446, Section 5.3.
This complies with FIPS 140-3 IG C.H Scenario 1.a.
NewGCMWithCounterNonce returns a new AEAD that works like GCM, but enforces
the construction of deterministic nonces. The nonce must be 96 bits, the
first 32 bits must be an encoding of the module name, and the last 64 bits
must be a counter. The starting value of the counter is set on the first call
to Seal, and each subsequent call must increment it as a big-endian uint64.
If the counter reaches the starting value minus one, Seal will panic.
This complies with FIPS 140-3 IG C.H Scenario 3.
NewGCMWithXORCounterNonce returns a new AEAD that works like GCM, but
enforces the construction of deterministic nonces. The nonce must be 96 bits,
the first 32 bits must be an encoding of the module name, and the last 64
bits must be a counter XOR'd with a fixed value. The module name and XOR mask
can be set with [GCMWithCounterNonce.SetNoncePrefixAndMask], or they are set
on the first call to Seal, assuming the counter starts at zero. Each
subsequent call must increment the counter as a big-endian uint64. If the
counter reaches 2⁶⁴ minus one, Seal will panic.
This complies with FIPS 140-3 IG C.H Scenario 3.
SealWithRandomNonce encrypts plaintext to out, and writes a random nonce to
nonce. nonce must be 12 bytes, and out must be 16 bytes longer than plaintext.
out and plaintext may overlap exactly or not at all. additionalData and out
must not overlap.
This complies with FIPS 140-3 IG C.H Scenario 2.
Note that this is NOT a [cipher.AEAD].Seal method.
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