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From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
Date: Thu, 7 Sep 2017 18:49:35 -0400
Subject: gpg: Default to SHA-512 for all signature types on RSA keys.
* g10/main.h (DEFAULT_DIGEST_ALGO): Use SHA512 instead of SHA256 in
--gnupg mode (leave strict RFC and PGP modes alone).
* configure.ac: Do not allow disabling sha512.
* g10/misc.c (map_md_openpgp_to_gcry): Always support SHA512.
--
SHA512 is more performant on most 64-bit platforms than SHA256, and
offers a better security margin. It is also widely implemented.
Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
---
configure.ac | 2 +-
g10/main.h | 2 +-
g10/misc.c | 5 +----
3 files changed, 3 insertions(+), 6 deletions(-)
Patch-Source: https://sources.debian.org/data/main/g/gnupg2/2.2.27-2/debian/patches/update-defaults/gpg-Default-to-SHA-512-for-all-signature-types-on-RS.patch
diff --git a/configure.ac b/configure.ac
index 2d8b050..4b9d908 100644
--- a/configure.ac
+++ b/configure.ac
@@ -317,7 +317,7 @@ GNUPG_GPG_DISABLE_ALGO([rmd160],[RIPE-MD160 hash])
GNUPG_GPG_DISABLE_ALGO([sha224],[SHA-224 hash])
# SHA256 is a MUST algorithm for GnuPG.
GNUPG_GPG_DISABLE_ALGO([sha384],[SHA-384 hash])
-GNUPG_GPG_DISABLE_ALGO([sha512],[SHA-512 hash])
+# SHA512 is a MUST algorithm for GnuPG.
# Allow disabling of zip support.
diff --git a/g10/main.h b/g10/main.h
index 1983e42..388eae3 100644
--- a/g10/main.h
+++ b/g10/main.h
@@ -41,7 +41,7 @@
# define DEFAULT_CIPHER_ALGO CIPHER_ALGO_3DES
#endif
-#define DEFAULT_DIGEST_ALGO ((GNUPG)? DIGEST_ALGO_SHA256:DIGEST_ALGO_SHA1)
+#define DEFAULT_DIGEST_ALGO ((GNUPG)? DIGEST_ALGO_SHA512:DIGEST_ALGO_SHA1)
#define DEFAULT_S2K_DIGEST_ALGO DIGEST_ALGO_SHA1
#ifdef HAVE_ZIP
# define DEFAULT_COMPRESS_ALGO COMPRESS_ALGO_ZIP
diff --git a/g10/misc.c b/g10/misc.c
index 634d303..6fc2d58 100644
--- a/g10/misc.c
+++ b/g10/misc.c
@@ -849,11 +849,8 @@ map_md_openpgp_to_gcry (digest_algo_t algo)
case DIGEST_ALGO_SHA384: return 0;
#endif
-#ifdef GPG_USE_SHA512
case DIGEST_ALGO_SHA512: return GCRY_MD_SHA512;
-#else
- case DIGEST_ALGO_SHA512: return 0;
-#endif
+
default: return 0;
}
}
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