Amazon S3 支援 MD5 以外的檢查演算法了

Amazon S3 宣佈支援 MD5 以外的檢查演算法了:「New – Additional Checksum Algorithms for Amazon S3」。

多支援了 SHA-1SHA-256 以及 CRC-32CRC-32C

In particular, you can specify the use of any one of four widely used checksum algorithms (SHA-1, SHA-256, CRC-32, and CRC-32C) when you upload each of your objects to S3.

雖然有拿 cryptographic hash function 來用,但其實是當作 checksum algorithm 在用,拿來檢查檔案正確性的,而不是防中間被竄改之類 (這個部份是靠 HTTPS),本來支援的 MD5 應該算是夠用,只是現在多了不少選擇。

然後全商用區都可以用了:

The four additional checksums are now available in all commercial AWS Regions and you can start using them today at no extra charge.

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