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Support public keys using the "ssh-ed25519" method.

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This introduces a third system of elliptic curve representation and
arithmetic, namely Edwards form.
This commit is contained in:
Chris Staite
2015-05-09 15:02:54 +01:00
committed by Simon Tatham
parent 541abf9258
commit 76a4b576e5
7 changed files with 1221 additions and 83 deletions
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13
ssh.h
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@ -124,13 +124,21 @@ struct ec_mcurve
struct ec_point G;
};
/* Edwards form curve */
struct ec_ecurve
{
Bignum l, d;
struct ec_point B;
};
struct ec_curve {
enum { EC_WEIERSTRASS, EC_MONTGOMERY } type;
enum { EC_WEIERSTRASS, EC_MONTGOMERY, EC_EDWARDS } type;
unsigned int fieldBits;
Bignum p;
union {
struct ec_wcurve w;
struct ec_mcurve m;
struct ec_ecurve e;
};
};
@ -421,6 +429,7 @@ extern const struct ssh_kexes ssh_rsa_kex;
extern const struct ssh_kexes ssh_ecdh_kex;
extern const struct ssh_signkey ssh_dss;
extern const struct ssh_signkey ssh_rsa;
extern const struct ssh_signkey ssh_ecdsa_ed25519;
extern const struct ssh_signkey ssh_ecdsa_nistp256;
extern const struct ssh_signkey ssh_ecdsa_nistp384;
extern const struct ssh_signkey ssh_ecdsa_nistp521;
@ -721,6 +730,8 @@ int dsa_generate(struct dss_key *key, int bits, progfn_t pfn,
void *pfnparam);
int ec_generate(struct ec_key *key, int bits, progfn_t pfn,
void *pfnparam);
int ec_edgenerate(struct ec_key *key, int bits, progfn_t pfn,
void *pfnparam);
Bignum primegen(int bits, int modulus, int residue, Bignum factor,
int phase, progfn_t pfn, void *pfnparam, unsigned firstbits);
void invent_firstbits(unsigned *one, unsigned *two);