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EC_METHOD customisation operations.

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Extend EC_METHOD to permit additional customisation of private key and
ECDH operations.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Emilia Käsper <emilia@openssl.org>
This commit is contained in:
Dr. Stephen Henson 2016-02-01 17:57:01 +00:00
parent 899cf48f17
commit 474d84ec81
1 changed files with 17 additions and 0 deletions
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17
crypto/ec/ec_lcl.h
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@ -83,6 +83,9 @@
/* Use default functions for poin2oct, oct2point and compressed coordinates */
#define EC_FLAGS_DEFAULT_OCT 0x1
/* Use custom formats for EC_GROUP, EC_POINT and EC_KEY */
#define EC_FLAGS_CUSTOM_CURVE 0x2
/*
* Structure details are not part of the exported interface, so all this may
* change in future versions.
@ -195,6 +198,20 @@ struct ec_method_st {
int (*field_decode) (const EC_GROUP *, BIGNUM *r, const BIGNUM *a,
BN_CTX *);
int (*field_set_to_one) (const EC_GROUP *, BIGNUM *r, BN_CTX *);
/* private key operations */
size_t (*priv2oct)(const EC_KEY *eckey, unsigned char *buf, size_t len);
int (*oct2priv)(EC_KEY *eckey, unsigned char *buf, size_t len);
int (*set_private)(EC_KEY *eckey, const BIGNUM *priv_key);
int (*keygen)(EC_KEY *eckey);
int (*keycheck)(const EC_KEY *eckey);
int (*keygenpub)(EC_KEY *eckey);
int (*keycopy)(EC_KEY *dst, const EC_KEY *src);
void (*keyfinish)(EC_KEY *eckey);
/* custom ECDH operation */
int (*ecdh_compute_key)(void *out, size_t outlen, const EC_POINT *pub_key,
const EC_KEY *ecdh,
void *(*KDF) (const void *in, size_t inlen,
void *out, size_t *outlen));
} /* EC_METHOD */ ;
/*