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I RSA encrypt an AES key using PyCrypto PKCS_OAEP. The OAEP uses SHA1 and MGF1 (defaults).

I am trying to get a Cipher instance in Java which matches my PyCrypto encryption param spec.

I see that the SHA1/MGF1 padding is fine, BUT totally unsure about the cipher mode. I assume it is ECB but can someone help here. Decryption is failing. I can provide the errors when I get to work, but till then there may be a trivial answer that will save any more discussion.

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    RSA can only be used in ECB mode. You need to show us how you are attempting to perform the decryption. Commented Sep 22, 2013 at 23:36
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    Public key ciphers are not used in any mode of operation, so the technically correct term is "NONE", though the JCE does accept "ECB" as a synonym for legacy compatibility reasons. The string to pass to Cipher.getInstance() should be "RSA/NONE/OAEPWithSHA1AndMGF1Padding". Commented Sep 23, 2013 at 15:35
  • @ntoskrnl sounds like an answer to me ... don't become CodesInChaos and use the answer button :P Commented Sep 23, 2013 at 19:14
  • Done. All good. Thx for the answers Commented Sep 24, 2013 at 4:36
  • @owlstead Posted comment as answer. Commented Sep 24, 2013 at 13:54

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Public key ciphers are not used in any mode of operation, so the technically correct term is "NONE", though the JCE does accept "ECB" as a synonym for legacy compatibility reasons. The string to pass to Cipher.getInstance() should be "RSA/NONE/OAEPWithSHA1AndMGF1Padding".

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SunJCE (1.7.40) seems to not have None as an option. RSA/ECB/OAEPWithSHA1AndMGF1Paddinng works fine

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