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crypto: allow Ed25519 signing larger digests (#124)

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Roman Zeyde 2016-10-24 13:41:10 +03:00 committed by Pavol Rusnak
parent e9f0706c2e
commit 0bb7f16b78
1 changed files with 11 additions and 5 deletions
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16
firmware/crypto.c
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@ -95,12 +95,18 @@ int sshMessageSign(HDNode *node, const uint8_t *message, size_t message_len, uin
int gpgMessageSign(HDNode *node, const uint8_t *message, size_t message_len, uint8_t *signature)
{
// GPG should sign a SHA256 digest of the original message.
if (message_len != 32) {
return 1;
}
signature[0] = 0; // prefix: pad with zero, so all signatures are 65 bytes
return hdnode_sign_digest(node, message, signature + 1, NULL, NULL);
const curve_info *ed25519_curve_info = get_curve_by_name(ED25519_NAME);
if (ed25519_curve_info && node->curve == ed25519_curve_info) {
// GPG supports variable size digest for Ed25519 signatures
return hdnode_sign(node, message, message_len, signature + 1, NULL, NULL);
} else {
// Ensure 256-bit digest before proceeding
if (message_len != 32) {
return 1;
}
return hdnode_sign_digest(node, message, signature + 1, NULL, NULL);
}
}
int cryptoMessageSign(const CoinType *coin, HDNode *node, const uint8_t *message, size_t message_len, uint8_t *signature)