Cryptographic Operations

def encrypt(
    algorithm: EncryptionAlgorithm,
    plaintext: bytes,
    *,
    iv: bytes = None,
    additional_authenticated_data: bytes = None,
    **kwargs
) -> EncryptResult:
    """
    Encrypt data using the key.

    Parameters:
    - algorithm: Encryption algorithm to use
    - plaintext: Data to encrypt
    - iv: Initialization vector (required for some algorithms)
    - additional_authenticated_data: Additional data for authenticated encryption

    Returns:
    EncryptResult: Encryption result with ciphertext and metadata
    """

def decrypt(
    algorithm: EncryptionAlgorithm,
    ciphertext: bytes,
    *,
    iv: bytes = None,
    authentication_tag: bytes = None,
    additional_authenticated_data: bytes = None,
    **kwargs
) -> DecryptResult:
    """
    Decrypt data using the key.

    Parameters:
    - algorithm: Encryption algorithm used for encryption
    - ciphertext: Data to decrypt
    - iv: Initialization vector (if used during encryption)
    - authentication_tag: Authentication tag (for authenticated encryption)
    - additional_authenticated_data: Additional data (if used during encryption)

    Returns:
    DecryptResult: Decryption result with plaintext
    """

from azure.keyvault.keys.crypto import CryptographyClient, EncryptionAlgorithm
from azure.identity import DefaultAzureCredential

# Create crypto client
key_id = "https://vault.vault.azure.net/keys/my-key/version"
crypto_client = CryptographyClient(key_id, DefaultAzureCredential())

# RSA encryption
plaintext = b"Hello, World!"
encrypt_result = crypto_client.encrypt(EncryptionAlgorithm.rsa_oaep_256, plaintext)
decrypt_result = crypto_client.decrypt(EncryptionAlgorithm.rsa_oaep_256, encrypt_result.ciphertext)

# AES-GCM encryption
import os
plaintext = b"Sensitive data"
encrypt_result = crypto_client.encrypt(
    EncryptionAlgorithm.a256_gcm,
    plaintext,
    iv=os.urandom(12)  # 96-bit IV for GCM
)
decrypt_result = crypto_client.decrypt(
    EncryptionAlgorithm.a256_gcm,
    encrypt_result.ciphertext,
    iv=encrypt_result.iv,
    authentication_tag=encrypt_result.tag
)

def sign(algorithm: SignatureAlgorithm, digest: bytes, **kwargs) -> SignResult:
    """
    Sign a digest using the key.

    Parameters:
    - algorithm: Signature algorithm to use
    - digest: Pre-computed hash digest to sign

    Returns:
    SignResult: Signature result
    """

def verify(
    algorithm: SignatureAlgorithm,
    digest: bytes,
    signature: bytes,
    **kwargs
) -> VerifyResult:
    """
    Verify a signature using the key.

    Parameters:
    - algorithm: Signature algorithm used for signing
    - digest: Original hash digest that was signed
    - signature: Signature to verify

    Returns:
    VerifyResult: Verification result indicating validity
    """

import hashlib
from azure.keyvault.keys.crypto import SignatureAlgorithm

# Create a hash digest
data = b"Important document content"
digest = hashlib.sha256(data).digest()

# Sign the digest
sign_result = crypto_client.sign(SignatureAlgorithm.rs256, digest)
print(f"Signature: {sign_result.signature.hex()}")

# Verify the signature
verify_result = crypto_client.verify(SignatureAlgorithm.rs256, digest, sign_result.signature)
print(f"Signature valid: {verify_result.is_valid}")

# ECDSA signing
ec_crypto_client = CryptographyClient("https://vault.vault.azure.net/keys/my-ec-key/version", credential)
sign_result = ec_crypto_client.sign(SignatureAlgorithm.es256, digest)
verify_result = ec_crypto_client.verify(SignatureAlgorithm.es256, digest, sign_result.signature)

def wrap_key(algorithm: KeyWrapAlgorithm, key: bytes, **kwargs) -> WrapResult:
    """
    Wrap (encrypt) a key using a key encryption key.

    Parameters:
    - algorithm: Key wrap algorithm to use
    - key: Key material to wrap

    Returns:
    WrapResult: Wrapped key result
    """

def unwrap_key(algorithm: KeyWrapAlgorithm, encrypted_key: bytes, **kwargs) -> UnwrapResult:
    """
    Unwrap (decrypt) a key using a key encryption key.

    Parameters:
    - algorithm: Key wrap algorithm used for wrapping
    - encrypted_key: Wrapped key material to unwrap

    Returns:
    UnwrapResult: Unwrapped key result
    """

from azure.keyvault.keys.crypto import KeyWrapAlgorithm
import os

# Generate a data encryption key
data_key = os.urandom(32)  # 256-bit key

# Wrap the key
wrap_result = crypto_client.wrap_key(KeyWrapAlgorithm.rsa_oaep_256, data_key)
print(f"Wrapped key: {wrap_result.encrypted_key.hex()}")

# Unwrap the key
unwrap_result = crypto_client.unwrap_key(KeyWrapAlgorithm.rsa_oaep_256, wrap_result.encrypted_key)
print(f"Keys match: {unwrap_result.key == data_key}")

# AES key wrapping
aes_kek_client = CryptographyClient("https://vault.vault.azure.net/keys/my-aes-key/version", credential)
wrap_result = aes_kek_client.wrap_key(KeyWrapAlgorithm.aes_256, data_key)
unwrap_result = aes_kek_client.unwrap_key(KeyWrapAlgorithm.aes_256, wrap_result.encrypted_key)

def create_rsa_private_key(**kwargs) -> KeyVaultRSAPrivateKey:
    """
    Create an RSA private key object backed by Key Vault.

    Returns:
    KeyVaultRSAPrivateKey: RSA private key implementation using Key Vault
    """

def create_rsa_public_key(**kwargs) -> KeyVaultRSAPublicKey:
    """
    Create an RSA public key object backed by Key Vault.

    Returns:
    KeyVaultRSAPublicKey: RSA public key implementation using Key Vault
    """

from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import padding

# Create Key Vault-backed RSA key objects
private_key = crypto_client.create_rsa_private_key()
public_key = private_key.public_key()

# Use with cryptography library patterns
message = b"Hello from cryptography library!"

# Encrypt using public key
ciphertext = public_key.encrypt(
    message,
    padding.OAEP(
        mgf=padding.MGF1(algorithm=hashes.SHA256()),
        algorithm=hashes.SHA256(),
        label=None
    )
)

# Decrypt using private key
plaintext = private_key.decrypt(
    ciphertext,
    padding.OAEP(
        mgf=padding.MGF1(algorithm=hashes.SHA256()),
        algorithm=hashes.SHA256(),
        label=None
    )
)

# Serialize public key
public_pem = public_key.public_bytes(
    encoding=serialization.Encoding.PEM,
    format=serialization.PublicFormat.SubjectPublicKeyInfo
)

def __init__(
    key: Union[KeyVaultKey, str],
    credential: TokenCredential,
    **kwargs
):
    """
    Create a CryptographyClient.

    Parameters:
    - key: KeyVaultKey object or key identifier URL
    - credential: Azure credential for authentication
    """

@classmethod
def from_jwk(cls, jwk: Union[JsonWebKey, Dict[str, Any]], **kwargs) -> "CryptographyClient":
    """
    Create a CryptographyClient from a JSON Web Key for local cryptographic operations.

    Parameters:
    - jwk: JSON Web Key containing cryptographic material

    Returns:
    CryptographyClient: Client for local cryptographic operations
    """

from azure.keyvault.keys import KeyClient
from azure.keyvault.keys.crypto import CryptographyClient

# From key ID
crypto_client = CryptographyClient("https://vault.vault.azure.net/keys/my-key/version", credential)

# From KeyVaultKey object
key_client = KeyClient("https://vault.vault.azure.net/", credential)
key = key_client.get_key("my-key")
crypto_client = CryptographyClient(key, credential)

# From JWK for local operations
jwk = {
    "kty": "RSA",
    "n": "...",  # RSA modulus
    "e": "AQAB",  # RSA public exponent
    # ... other parameters
}
local_crypto_client = CryptographyClient.from_jwk(jwk)

class CryptographyClient:
    """Client for performing cryptographic operations with Azure Key Vault keys."""
    key_id: str
    vault_url: str

class EncryptResult:
    """Result of an encrypt operation."""
    key_id: str
    algorithm: EncryptionAlgorithm
    ciphertext: bytes
    iv: bytes
    tag: bytes
    aad: bytes

class DecryptResult:
    """Result of a decrypt operation."""
    key_id: str
    algorithm: EncryptionAlgorithm
    plaintext: bytes

class SignResult:
    """Result of a sign operation."""
    key_id: str
    algorithm: SignatureAlgorithm
    signature: bytes

class VerifyResult:
    """Result of a verify operation."""
    key_id: str
    algorithm: SignatureAlgorithm
    is_valid: bool

class WrapResult:
    """Result of a wrap key operation."""
    key_id: str
    algorithm: KeyWrapAlgorithm
    encrypted_key: bytes

class UnwrapResult:
    """Result of an unwrap key operation."""
    key_id: str
    algorithm: KeyWrapAlgorithm
    key: bytes

class KeyVaultRSAPrivateKey:
    """RSA private key implementation backed by Key Vault."""
    key_size: int
    def decrypt(ciphertext: bytes, padding) -> bytes: ...
    def sign(data: bytes, padding, algorithm) -> bytes: ...
    def public_key() -> KeyVaultRSAPublicKey: ...
    def private_numbers() -> RSAPrivateNumbers: ...
    def private_bytes(encoding, format, encryption_algorithm) -> bytes: ...

class KeyVaultRSAPublicKey:
    """RSA public key implementation backed by Key Vault."""
    key_size: int
    def encrypt(plaintext: bytes, padding) -> bytes: ...
    def verify(signature: bytes, data: bytes, padding, algorithm) -> None: ...
    def public_numbers() -> RSAPublicNumbers: ...
    def public_bytes(encoding, format) -> bytes: ...

class EncryptionAlgorithm(str, Enum):
    """Encryption algorithms."""
    # RSA algorithms
    rsa_oaep = "RSA-OAEP"
    rsa_oaep_256 = "RSA-OAEP-256"
    rsa1_5 = "RSA1_5"
    # AES GCM algorithms
    a128_gcm = "A128GCM"
    a192_gcm = "A192GCM"
    a256_gcm = "A256GCM"
    # AES CBC algorithms
    a128_cbc = "A128CBC"
    a192_cbc = "A192CBC"
    a256_cbc = "A256CBC"
    # AES CBC with PKCS7 padding
    a128_cbcpad = "A128CBCPAD"
    a192_cbcpad = "A192CBCPAD"
    a256_cbcpad = "A256CBCPAD"

class KeyWrapAlgorithm(str, Enum):
    """Key wrapping algorithms."""
    # AES key wrap algorithms
    aes_128 = "A128KW"
    aes_192 = "A192KW"
    aes_256 = "A256KW"
    # RSA key wrap algorithms
    rsa_oaep = "RSA-OAEP"
    rsa_oaep_256 = "RSA-OAEP-256"
    rsa1_5 = "RSA1_5"
    # PKCS#11 mechanisms
    ckm_aes_key_wrap = "CKM_AES_KEY_WRAP"
    ckm_aes_key_wrap_pad = "CKM_AES_KEY_WRAP_PAD"

class SignatureAlgorithm(str, Enum):
    """Signature algorithms."""
    # RSA PSS algorithms
    ps256 = "PS256"  # RSASSA-PSS using SHA-256
    ps384 = "PS384"  # RSASSA-PSS using SHA-384
    ps512 = "PS512"  # RSASSA-PSS using SHA-512
    # RSA PKCS#1 v1.5 algorithms
    rs256 = "RS256"  # RSASSA-PKCS1-v1_5 using SHA-256
    rs384 = "RS384"  # RSASSA-PKCS1-v1_5 using SHA-384
    rs512 = "RS512"  # RSASSA-PKCS1-v1_5 using SHA-512
    # ECDSA algorithms
    es256 = "ES256"  # ECDSA using P-256 and SHA-256
    es384 = "ES384"  # ECDSA using P-384 and SHA-384
    es512 = "ES512"  # ECDSA using P-521 and SHA-512
    es256_k = "ES256K"  # ECDSA using P-256K and SHA-256
    # HMAC algorithms
    hs256 = "HS256"  # HMAC using SHA-256
    hs384 = "HS384"  # HMAC using SHA-384
    hs512 = "HS512"  # HMAC using SHA-512