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5.6

GnuPG --passphrase-fd option in BASH

Asked by rblampain in Linux Network Security

Tags: gpg, passphrase, gnupg, key

Fedora C2.
I need to encrypt a file received by a CGI script and be able to decrypt it later. I need these processes automated.
I have made the following test script that I hoped would do both and can be split later:

#!/bin/bash
rm -f encrypted
cat phrase | gpg --batch --passphrase-fd 0 --output encrypted --encrypt unencrypted.txt
cat phrase | gpg --batch --passphrase-fd 0 --output decrypted --decrypt encrypted

"phrase" is a file containing a 32 bytes passphrase.

The encryption is working but the decryption is not, if I try to include -c or --symmetric in the first line then it doesn't work either.

gpg: encrypted with 1024-bit ELG-E key, ID 96C7D90C, created 2005-08-11
"............................................................."
gpg: public key decryption failed: bad passphrase
gpg: decryption failed: secret key not available

Questions:
1) can anyone correct the script? I have created a pair of asymmetric keys and it looks like the script is using it when I probably need it to use the symmetric key from the passphrase.
2) how can I suppress all comments? I thought --batch would do that.

Thank you for your help.

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20091021-EE-VQP-81

GnuPG --passphrase-fd option in BASH

Asked by rblampain in Linux Network Security

Tags: gpg, passphrase, gnupg, key

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