[style] Remove magic words.

project-chip · Aug 23, 2022 · cc70c1c · cc70c1c
1 parent 3c76544
commit cc70c1c
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Showing 3 changed files with 8 additions and 6 deletions.
diff --git a/src/crypto/CHIPCryptoPAL.cpp b/src/crypto/CHIPCryptoPAL.cpp
@@ -710,7 +710,7 @@ CHIP_ERROR AES_CTR_crypt(const uint8_t * input, size_t input_length, const uint8
                          size_t nonce_length, uint8_t * output)
 {
     // Discard tag portion of CCM to apply only CTR mode encryption/decryption.
-    constexpr size_t kTagLen = 16;
+    constexpr size_t kTagLen = Crypto::kAES_CCM128_Tag_Length;
     uint8_t tag[kTagLen];
 
     return AES_CCM_encrypt(input, input_length, nullptr, 0, key, key_length, nonce, nonce_length, output, tag, kTagLen);

diff --git a/src/crypto/CHIPCryptoPAL.h b/src/crypto/CHIPCryptoPAL.h
@@ -78,6 +78,8 @@ constexpr size_t kP256_PublicKey_Length  = CHIP_CRYPTO_PUBLIC_KEY_SIZE_BYTES;
 
 constexpr size_t kAES_CCM128_Key_Length   = 128u / 8u;
 constexpr size_t kAES_CCM128_Block_Length = kAES_CCM128_Key_Length;
+constexpr size_t kAES_CCM128_Nonce_Length = 13;
+constexpr size_t kAES_CCM128_Tag_Length   = 16;
 
 /* These sizes are hardcoded here to remove header dependency on underlying crypto library
  * in a public interface file. The validity of these sizes is verified by static_assert in
@@ -622,9 +624,9 @@ CHIP_ERROR AES_CCM_decrypt(const uint8_t * ciphertext, size_t ciphertext_length,
  * @brief A function that implements AES-CCM decryption
  *
  * This implements the AES-CTR-Encrypt/Decrypt() cryptographic primitives per sections
- * 3.7.1 and 3.7.2 of the specification. For an empty ciphertext, the user of the API
- * can provide an empty string, or a nullptr, and provide ciphertext_length as 0.
- * The output buffer, plaintext can also be an empty string, or a nullptr for this case.
+ * 3.7.1 and 3.7.2 of the specification. For an empty input, the user of the API
+ * can provide an empty string, or a nullptr, and provide input as 0.
+ * The output buffer can also be an empty string, or a nullptr for this case.
  *
  * @param input Input text to encrypt/decrypt
  * @param input_length Length of ciphertext

diff --git a/src/crypto/tests/CHIPCryptoPALTest.cpp b/src/crypto/tests/CHIPCryptoPALTest.cpp
@@ -202,8 +202,8 @@ const AesCtrTestEntry theAesCtrTestVector[] = {
 
 constexpr size_t kAesCtrTestVectorSize = sizeof(theAesCtrTestVector) / sizeof(theAesCtrTestVector[0]);
 
-constexpr size_t KEY_LENGTH   = 16;
-constexpr size_t NONCE_LENGTH = 13;
+constexpr size_t KEY_LENGTH   = Crypto::kAES_CCM128_Key_Length;
+constexpr size_t NONCE_LENGTH = Crypto::kAES_CCM128_Nonce_Length;
 
 static void TestAES_CTR_128_Encrypt(nlTestSuite * inSuite, const AesCtrTestEntry * vector)
 {