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Differential D505 Diff 1434 g10/sign.c

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g10/sign.c

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usable for the pubkey algorithm. If --personal-digest-prefs isn't usable for the pubkey algorithm. If --personal-digest-prefs isn't
set, then take the OpenPGP default (i.e. SHA-1). set, then take the OpenPGP default (i.e. SHA-1).
Note that Ed25519+EdDSA takes an input of arbitrary length and thus Note that EdDSA takes an input of arbitrary length and thus
we don't enforce any particular algorithm like we do for standard we don't enforce any particular algorithm like we do for standard
ECDSA. However, we use SHA256 as the default algorithm. ECDSA. However, we use SHA256 as the default algorithm.
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{ {
return recipient_digest_algo; return recipient_digest_algo;
} }
else if (pk->pubkey_algo == PUBKEY_ALGO_EDDSA else if (pk->pubkey_algo == PUBKEY_ALGO_EDDSA)
&& openpgp_oid_is_ed25519 (pk->pkey[0]))
{ {
if (opt.personal_digest_prefs) if (opt.personal_digest_prefs)
return opt.personal_digest_prefs[0].value; return opt.personal_digest_prefs[0].value;
else else
return DIGEST_ALGO_SHA256; if (gcry_mpi_get_nbits (pk->pkey[1]) > 256)
return DIGEST_ALGO_SHA512;
else
return DIGEST_ALGO_SHA256;
} }
else if (pk->pubkey_algo == PUBKEY_ALGO_DSA else if (pk->pubkey_algo == PUBKEY_ALGO_DSA
|| pk->pubkey_algo == PUBKEY_ALGO_ECDSA) || pk->pubkey_algo == PUBKEY_ALGO_ECDSA)
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digest_algo = opt.cert_digest_algo; digest_algo = opt.cert_digest_algo;
else if (pksk->pubkey_algo == PUBKEY_ALGO_DSA) /* Meet DSA requirements. */ else if (pksk->pubkey_algo == PUBKEY_ALGO_DSA) /* Meet DSA requirements. */
digest_algo = match_dsa_hash (gcry_mpi_get_nbits (pksk->pkey[1])/8); digest_algo = match_dsa_hash (gcry_mpi_get_nbits (pksk->pkey[1])/8);
else if (pksk->pubkey_algo == PUBKEY_ALGO_ECDSA /* Meet ECDSA requirements. */ else if (pksk->pubkey_algo == PUBKEY_ALGO_ECDSA) /* Meet ECDSA requirements. */
|| pksk->pubkey_algo == PUBKEY_ALGO_EDDSA) digest_algo = match_dsa_hash
(ecdsa_qbits_from_Q (gcry_mpi_get_nbits (pksk->pkey[1]))/8);
else if (pksk->pubkey_algo == PUBKEY_ALGO_EDDSA)
{ {
if (openpgp_oid_is_ed25519 (pksk->pkey[0])) if (gcry_mpi_get_nbits (pksk->pkey[1]) > 256)
digest_algo = DIGEST_ALGO_SHA256; digest_algo = DIGEST_ALGO_SHA512;
else else
digest_algo = match_dsa_hash digest_algo = DIGEST_ALGO_SHA256;
(ecdsa_qbits_from_Q (gcry_mpi_get_nbits (pksk->pkey[1]))/8);
} }
else /* Use the default. */ else /* Use the default. */
digest_algo = DEFAULT_DIGEST_ALGO; digest_algo = DEFAULT_DIGEST_ALGO;
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