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- Lee_SutcliffeNacreous
You can use openssl
openssl req -text -noout -verify -in my.csr
The signature algorithm should be displayed towards the bottom. SHA1 is a 160 Bit hash, SHA2 is a family of hashes, most commonly used is 256
In my example, it's SHA2 as a 256 hash is used.
-- output omited -- Exponent: 65537 (0x10001) Attributes: a0:00 Signature Algorithm: sha256WithRSAEncryption 36:7a:46:3e:49:a5:ec:a6:f8:a7:ff:fc:e4:58:d5:06:0d:fc: 4a:25:a3:c8:f0:65:87:15:f9:30:8d:c7:fd:05:e9:1f:bb:77: -- output omited --