Hello, Recently I come across this error "gpg: signing failed: Invalid length" when use brainpool512r1 keys to do sign operations, such as --sign-key, --lsign-key or even generate a brainpool512r1 key.
All keys except Brainpool P-384 and Brainpool P-512 work fine. I tried to generate Brainpool P-256, it's fine. Strange thing is that I use brainpool512r1 before, and no error occurred. The error just shows recently, maybe it is a configuration error? - Version gpg (GnuPG) 2.2.4/2.2.9 both tried libgcrypt 1.8.1 Ubuntu 18.04 LTS/MacOS 10.13.6 both tried - steps to reproduce this error: gpg --expert --full-gen-key gpg (GnuPG) 2.2.4; Copyright (C) 2017 Free Software Foundation, Inc. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Please select what kind of key you want: (1) RSA and RSA (default) (2) DSA and Elgamal (3) DSA (sign only) (4) RSA (sign only) (7) DSA (set your own capabilities) (8) RSA (set your own capabilities) (9) ECC and ECC (10) ECC (sign only) (11) ECC (set your own capabilities) (13) Existing key Your selection? 11 Possible actions for a ECDSA/EdDSA key: Sign Certify Authenticate Current allowed actions: Sign Certify (S) Toggle the sign capability (A) Toggle the authenticate capability (Q) Finished Your selection? a Possible actions for a ECDSA/EdDSA key: Sign Certify Authenticate Current allowed actions: Sign Certify Authenticate (S) Toggle the sign capability (A) Toggle the authenticate capability (Q) Finished Your selection? q Please select which elliptic curve you want: (1) Curve 25519 (3) NIST P-256 (4) NIST P-384 (5) NIST P-521 (6) Brainpool P-256 (7) Brainpool P-384 (8) Brainpool P-512 (9) secp256k1 Your selection? 8 Please specify how long the key should be valid. 0 = key does not expire <n> = key expires in n days <n>w = key expires in n weeks <n>m = key expires in n months <n>y = key expires in n years Key is valid for? (0) 1d Key expires at Mon 03 Sep 2018 10:39:53 AM CST Is this correct? (y/N) y GnuPG needs to construct a user ID to identify your key. Real name: test2 Email address: test2 Comment: You selected this USER-ID: "test2 <test2>" Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? o We need to generate a lot of random bytes. It is a good idea to perform some other action (type on the keyboard, move the mouse, utilize the disks) during the prime generation; this gives the random number generator a better chance to gain enough entropy. gpg: signing failed: Invalid length gpg: make_keysig_packet failed: Invalid length Key generation failed: Invalid length Best regards, Yanzhe Lee
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