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ssh: support RSA SHA-2 (RFC8332) signatures

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This change adds support for RSA SHA-2 based signatures for host keys and certificates. It also switches the default certificate signature algorithm for RSA to use SHA-512. This is implemented by treating ssh.Signer specially when the key type is `ssh-rsa` by also allowing SHA-256 and SHA-512 signatures.

Fixes golang/go#37278

Change-Id: I2ee1ac4ae4c9c1de441a2d6cf1e806357ef18910
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/220037
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
This commit is contained in:
Hans Nielsen
2021-11-15 23:45:14 +00:00
committed by Jason A. Donenfeld
parent ceb1ce70b4
commit b4de73f9ec
12 changed files with 213 additions and 69 deletions
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ssh/test/test_unix_test.go
+1 -1
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@@ -35,7 +35,7 @@ Banner {{.Dir}}/banner
HostKey {{.Dir}}/id_rsa
HostKey {{.Dir}}/id_dsa
HostKey {{.Dir}}/id_ecdsa
HostCertificate {{.Dir}}/id_rsa-cert.pub
HostCertificate {{.Dir}}/id_rsa-sha2-512-cert.pub
Pidfile {{.Dir}}/sshd.pid
#UsePrivilegeSeparation no
KeyRegenerationInterval 3600