EnricoMi commented on code in PR #44990:
URL: https://github.com/apache/arrow/pull/44990#discussion_r1945046993
##########
cpp/src/parquet/encryption/encryption_internal.cc:
##########
@@ -52,25 +52,55 @@ constexpr int32_t kBufferSizeLength = 4;
throw ParquetException("Couldn't init ALG decryption"); \
}
-class AesEncryptor::AesEncryptorImpl {
+class AesEncryptionContext {
+ public:
+ AesEncryptionContext(ParquetCipher::type alg_id, int32_t key_len, bool
metadata,
+ bool write_length) {
+ openssl::EnsureInitialized();
+
+ length_buffer_length_ = write_length ? kBufferSizeLength : 0;
+ ciphertext_size_delta_ = length_buffer_length_ + kNonceLength;
+ if (metadata || (ParquetCipher::AES_GCM_V1 == alg_id)) {
+ aes_mode_ = kGcmMode;
+ ciphertext_size_delta_ += kGcmTagLength;
+ } else {
+ aes_mode_ = kCtrMode;
+ }
+
+ if (16 != key_len && 24 != key_len && 32 != key_len) {
+ std::stringstream ss;
+ ss << "Wrong key length: " << key_len;
+ throw ParquetException(ss.str());
+ }
+
+ key_length_ = key_len;
+ }
+
+ virtual ~AesEncryptionContext() = default;
+
+ protected:
+ static inline std::function<void(EVP_CIPHER_CTX*)> ctx_deleter_ =
+ [](EVP_CIPHER_CTX* ctx) { EVP_CIPHER_CTX_free(ctx); };
Review Comment:
:sparkles: smart pointer magic :sparkles:
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