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pozil edited this page Oct 16, 2023 · 11 revisions

EncryptionRecipes

Demonstrates how to use different encryption and signing algorithms in Apex

Group Encryption Recipes

Fields

public AES_KEY → Blob

public DIGITAL_SIGNATURE_PRIVATE_KEY → Blob

public DIGITAL_SIGNATURE_PUBLIC_KEY → Blob

public HMAC_KEY → Blob

Methods

public static Blob encryptAES256WithManagedIVRecipe(Blob dataToEncrypt)

AURAENABLED

Encrypts data using AES algorithm, which needs a symmetric key to be shared with the receiver. In this case the initialization vector is managed by Salesforce.

Parameters

Param Description
dataToEncrypt Blob that contains the data to encrypt

Returns

Type Description
Blob Blob

Example

Blob dataToEncrypt = Blob.valueOf('Test data');
Blob encryptedData = EncryptionRecipes.encryptAES256WithManagedIVRecipe(dataToEncrypt);
System.debug(EncodingUtil.base64Encode(encryptedData));

public static Blob decryptAES256WithManagedIVRecipe(Blob dataToDecrypt)

AURAENABLED

Encrypts data using AES algorithm, which needs a symmetric key to be shared with the receiver. In this case the initialization vector will be the first 128 bits (16 bytes) of the received data.

Parameters

Param Description
dataToDecrypt Blob that contains the data to be decrypted

Returns

Type Description
Blob Blob

Example

Blob decryptedData = EncryptionRecipes.decryptAES256WithManagedIVRecipe(encryptedData);
System.debug(decryptedData.toString());

public static Blob encryptAES256Recipe(Blob dataToEncrypt, Blob initializationVector)

AURAENABLED

Encrypts data using AES algorithm, which needs a symmetric key to be shared with the receiver. In this case the initialization vector is specified by the sender. It needs to be random and 16 bytes (128 bits).

Parameters

Param Description
dataToEncrypt Blob that contains the data to encrypt

Returns

Type Description
Blob Blob

Example

Blob initializationVector = EncryptionRecipes.generateInitializationVector();
Blob dataToEncrypt = Blob.valueOf('Test data');
Blob encryptedData = EncryptionRecipes.encryptAES256Recipe(dataToEncrypt, initializationVector);
System.debug(EncodingUtil.base64Encode(encryptedData));

public static Blob decryptAES256Recipe(Blob dataToDecrypt)

AURAENABLED

Encrypts data using AES algorithm, which needs a symmetric key to be shared with the receiver. In this case the sender needs to share the initialization vector with the receiver.

Parameters

Param Description
dataToDecrypt Blob that contains the data to be decrypted

Returns

Type Description
Blob Blob

Example

Blob decryptedData = EncryptionRecipes.decryptAES256Recipe(encryptedData);
System.debug(decryptedData.toString());

public static Blob generateInitializationVector()

Aux method to generate a random initialization vector.

Returns

Type Description
Blob Blob

public static Blob generateSHA512HashRecipe(Blob dataToHash)

AURAENABLED

Generates one-way hash digest that can be checked in destination to ensure integrity.

Parameters

Param Description
dataToHmac Blob that contains some data for which to generate a hash

Returns

Type Description
Blob Blob

Example

Blob dataToHash = Blob.valueOf('Test data');
Blob hash = EncryptionRecipes.generateSHA512HashRecipe();
System.debug(EncodingUtil.base64Encode(hash));

public static void checkSHA512HashRecipe(Blob hash, Blob dataToCheck)

AURAENABLED

Recomputes hash digest for and compares it with the received one, throwing an exception if they're not equal.

Parameters

Param Description
hash Blob that contains the received hash
dataToCheck Blob that contains the data to check the hash for

Returns

Type Description
void void

Example

try {
 EncryptionRecipes.checkSHA512HashRecipe(hash, corruptedData);
} catch(Exception e) {
 // Should log exception
 System.debug(e.getMessage());
}

public static Blob generateHMACSHA512Recipe(Blob dataToHmac)

AURAENABLED

Generates one-way HMAC (using a symmetric key) that can be checked in destination to ensure integrity and authenticity.

Parameters

Param Description
dataToHmac Blob that contains some data for which to generate an HMAC

Returns

Type Description
Blob Blob

Example

Blob dataToHmac = Blob.valueOf('Test data');
Blob hmac = EncryptionRecipes.generateHMACSHA512Recipe();
System.debug(EncodingUtil.base64Encode(hmac));

public static void checkHMACSHA512Recipe(Blob hmac, Blob dataToCheck)

AURAENABLED

Recomputes HMAC using the symmetric key and compares it with the received one, throwing an exception if they're not equal.

Parameters

Param Description
hmac Blob that contains the received hmac
dataToCheck Blob that contains the data to check the hmac for

Returns

Type Description
void void

Example

try {
 EncryptionRecipes.checkHMACSHA512Recipe(hmac, corruptedData);
} catch(Exception e) {
 // Should log exception
 System.debug(e.getMessage());
}

public static Blob generateRSASHA512DigitalSignatureRecipe(Blob dataToSign)

AURAENABLED

Generates one-way Digital Signature (encrypted with an asymmetric key) that can be checked in destination to ensure integrity, authenticity and non-repudiation.

Parameters

Param Description
dataToSign Blob that contains some data to sign

Returns

Type Description
Blob Blob

Example

Blob dataToSign = Blob.valueOf('Test data');
Blob signature = EncryptionRecipes.generateRSASHA512DigitalSignatureRecipe();
System.debug(EncodingUtil.base64Encode(signature));

public static void checkRSASHA512DigitalSignatureRecipe(Blob signature, Blob dataToCheck)

AURAENABLED

Recomputes Digital Signature for and compares it with the received one, throwing an exception if they're not equal.

Parameters

Param Description
signature Blob that contains the received signature
dataToCheck Blob that contains the data to check the signature for

Returns

Type Description
void void

Example

try {
 EncryptionRecipes.checkRSASHA512DigitalSignatureRecipe(signature, corruptedData);
} catch(Exception e) {
 // Should log exception
 System.debug(e.getMessage());
}

public static EncryptedAndSignedData encryptAES256AndGenerateRSASHA512DigitalSignRecipe(Blob dataToEncryptAndSign)

AURAENABLED

Encrypts the message with AES and then generates Digital Signature (encrypted with an asymmetric key) that can be checked in destination. This ensure confidentiality, integrity, authenticity and non-repudiation.

Parameters

Param Description
dataToEncryptAndSign Blob that contains some data to encrypt and sign

Returns

Type Description
EncryptedAndSignedData Blob

Example

Blob dataToEncryptAndSign = Blob.valueOf('Test data');
EncryptedAndSignedData wrapper = EncryptionRecipes.encryptAES256AndGenerateRSASHA512DigitalSignRecipe();
System.debug(EncodingUtil.base64Encode(wrapper.encryptedData));
System.debug(EncodingUtil.base64Encode(wrapper.signature));

public static Blob decryptAES256AndCheckRSASHA512DigitalSignRecipe(Blob signature, Blob dataToDecryptAndCheck)

AURAENABLED

Decrypts the message and verifies its Digital Signature.

Parameters

Param Description
signature Blob that contains the received signature
dataToDecryptAndCheck Blob that contains the data to check the signature for

Returns

Type Description
Blob Blob decrypted data

Example

try {
 EncryptionRecipes.decryptAES256AndCheckRSASHA512DigitalSignRecipe(signature, corruptedData);
} catch(Exception e) {
 // Should log exception
 System.debug(e.getMessage());
}

public static boolean areEqualConstantTime(String first, String second)

Comparisons which involve cryptography need to be performed in constant time using specialized functions to avoid timing attack effects. https://en.wikipedia.org/wiki/Timing_attack

Parameters

Param Description
first first String to compare
second second String to compare

Returns

Type Description
boolean Boolean strings are equal

Enums

AESAlgorithm

DigitalSignatureAlgorithm

HMACAlgorithm

HashAlgorithm

Classes

CryptographicException

Internal custom exception class

Inheritance

CryptographicException

EncryptedAndSignedData

Fields

public encryptedData → Blob
public signature → Blob
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