> Interestingly, when I tried searching the latest GnuPG code base (cloned from
> github)
> for the "Weak encryption key" error message, nothing showed up.
>
> $ "grep -iRl "Weak encryption key" gnupg
> <no matches>
>
It appears that the problem lies in libgcrypt, which refuses to set a key for
this
cipher that's considered weak.
libgcrypt/cipher/blowfish.c
static gcry_err_code_t
do_bf_setkey (BLOWFISH_context *c, const byte *key, unsigned keylen)
...
/* Check for weak key. A weak key is a key in which a value in
the P-array (here c) occurs more than once per table. */
if (weak)
return GPG_ERR_WEAK_KEY;
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