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secp256k1
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Use a flags bitfield for compressed option to secp256k1_ec_pubkey_serialize and secp256k1_ec_privkey_export

This commit is contained in:
Luke Dashjr 2015-09-01 06:00:35 +00:00
parent 05732c5a5f
commit 486b9bb8ce
9 changed files with 27 additions and 22 deletions
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13
include/secp256k1.h
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@ -137,6 +137,9 @@ typedef int (*secp256k1_nonce_function_t)(
# define SECP256K1_CONTEXT_VERIFY (1 << 0)
# define SECP256K1_CONTEXT_SIGN (1 << 1)
/** Flag to pass to secp256k1_ec_pubkey_serialize and secp256k1_ec_privkey_export. */
# define SECP256K1_EC_COMPRESSED (1 << 0)
/** Create a secp256k1 context object.
*
* Returns: a newly created context object.
@ -243,14 +246,15 @@ SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_parse(
* size.
* In: pubkey: a pointer to a secp256k1_pubkey_t containing an initialized
* public key.
* compressed: whether to serialize in compressed format.
* flags: SECP256K1_EC_COMPRESSED if serialization should be in
* compressed format.
*/
int secp256k1_ec_pubkey_serialize(
const secp256k1_context_t* ctx,
unsigned char *output,
size_t *outputlen,
const secp256k1_pubkey_t* pubkey,
int compressed
unsigned int flags
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
/** Parse a DER ECDSA signature.
@ -396,7 +400,8 @@ SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_pubkey_create(
* privkeylen: Pointer to an int where the length of the private key in
* privkey will be stored.
* In: seckey: pointer to a 32-byte secret key to export.
* compressed: whether the key should be exported in compressed format.
* flags: SECP256K1_EC_COMPRESSED if the key should be exported in
* compressed format.
*
* This function is purely meant for compatibility with applications that
* require BER encoded keys. When working with secp256k1-specific code, the
@ -410,7 +415,7 @@ SECP256K1_WARN_UNUSED_RESULT int secp256k1_ec_privkey_export(
unsigned char *privkey,
size_t *privkeylen,
const unsigned char *seckey,
int compressed
unsigned int flags
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
/** Import a private key in DER format.

2
src/bench_recover.c
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@ -27,7 +27,7 @@ void bench_recover(void* arg) {
secp256k1_ecdsa_recoverable_signature_t sig;
CHECK(secp256k1_ecdsa_recoverable_signature_parse_compact(data->ctx, &sig, data->sig, i % 2));
CHECK(secp256k1_ecdsa_recover(data->ctx, &pubkey, &sig, data->msg));
CHECK(secp256k1_ec_pubkey_serialize(data->ctx, pubkeyc, &pubkeylen, &pubkey, 1));
CHECK(secp256k1_ec_pubkey_serialize(data->ctx, pubkeyc, &pubkeylen, &pubkey, SECP256K1_EC_COMPRESSED));
for (j = 0; j < 32; j++) {
data->sig[j + 32] = data->msg[j]; /* Move former message to S. */
data->msg[j] = data->sig[j]; /* Move former R to message. */

2
src/bench_schnorr_verify.c
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@ -37,7 +37,7 @@ static void benchmark_schnorr_init(void* arg) {
secp256k1_schnorr_sign(data->ctx, data->sigs[k].sig, data->msg, data->sigs[k].key, NULL, NULL);
data->sigs[k].pubkeylen = 33;
CHECK(secp256k1_ec_pubkey_create(data->ctx, &pubkey, data->sigs[k].key));
CHECK(secp256k1_ec_pubkey_serialize(data->ctx, data->sigs[k].pubkey, &data->sigs[k].pubkeylen, &pubkey, 1));
CHECK(secp256k1_ec_pubkey_serialize(data->ctx, data->sigs[k].pubkey, &data->sigs[k].pubkeylen, &pubkey, SECP256K1_EC_COMPRESSED));
}
}

2
src/bench_verify.c
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@ -54,7 +54,7 @@ int main(void) {
CHECK(secp256k1_ecdsa_sign(data.ctx, &sig, data.msg, data.key, NULL, NULL));
CHECK(secp256k1_ecdsa_signature_serialize_der(data.ctx, data.sig, &data.siglen, &sig));
CHECK(secp256k1_ec_pubkey_create(data.ctx, &pubkey, data.key));
CHECK(secp256k1_ec_pubkey_serialize(data.ctx, data.pubkey, &data.pubkeylen, &pubkey, 1) == 1);
CHECK(secp256k1_ec_pubkey_serialize(data.ctx, data.pubkey, &data.pubkeylen, &pubkey, SECP256K1_EC_COMPRESSED) == 1);
run_benchmark("ecdsa_verify", benchmark_verify, NULL, NULL, &data, 10, 20000);

4
src/eckey.h
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@ -15,10 +15,10 @@
#include "ecmult_gen.h"
static int secp256k1_eckey_pubkey_parse(secp256k1_ge_t *elem, const unsigned char *pub, size_t size);
static int secp256k1_eckey_pubkey_serialize(secp256k1_ge_t *elem, unsigned char *pub, size_t *size, int compressed);
static int secp256k1_eckey_pubkey_serialize(secp256k1_ge_t *elem, unsigned char *pub, size_t *size, unsigned int flags);
static int secp256k1_eckey_privkey_parse(secp256k1_scalar_t *key, const unsigned char *privkey, size_t privkeylen);
static int secp256k1_eckey_privkey_serialize(const secp256k1_ecmult_gen_context_t *ctx, unsigned char *privkey, size_t *privkeylen, const secp256k1_scalar_t *key, int compressed);
static int secp256k1_eckey_privkey_serialize(const secp256k1_ecmult_gen_context_t *ctx, unsigned char *privkey, size_t *privkeylen, const secp256k1_scalar_t *key, unsigned int flags);
static int secp256k1_eckey_privkey_tweak_add(secp256k1_scalar_t *key, const secp256k1_scalar_t *tweak);
static int secp256k1_eckey_pubkey_tweak_add(const secp256k1_ecmult_context_t *ctx, secp256k1_ge_t *key, const secp256k1_scalar_t *tweak);

8
src/eckey_impl.h
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@ -33,14 +33,14 @@ static int secp256k1_eckey_pubkey_parse(secp256k1_ge_t *elem, const unsigned cha
}
}
static int secp256k1_eckey_pubkey_serialize(secp256k1_ge_t *elem, unsigned char *pub, size_t *size, int compressed) {
static int secp256k1_eckey_pubkey_serialize(secp256k1_ge_t *elem, unsigned char *pub, size_t *size, unsigned int flags) {
if (secp256k1_ge_is_infinity(elem)) {
return 0;
}
secp256k1_fe_normalize_var(&elem->x);
secp256k1_fe_normalize_var(&elem->y);
secp256k1_fe_get_b32(&pub[1], &elem->x);
if (compressed) {
if (flags & SECP256K1_EC_COMPRESSED) {
*size = 33;
pub[0] = 0x02 | (secp256k1_fe_is_odd(&elem->y) ? 0x01 : 0x00);
} else {
@ -94,13 +94,13 @@ static int secp256k1_eckey_privkey_parse(secp256k1_scalar_t *key, const unsigned
return !overflow;
}
static int secp256k1_eckey_privkey_serialize(const secp256k1_ecmult_gen_context_t *ctx, unsigned char *privkey, size_t *privkeylen, const secp256k1_scalar_t *key, int compressed) {
static int secp256k1_eckey_privkey_serialize(const secp256k1_ecmult_gen_context_t *ctx, unsigned char *privkey, size_t *privkeylen, const secp256k1_scalar_t *key, unsigned int flags) {
secp256k1_gej_t rp;
secp256k1_ge_t r;
size_t pubkeylen = 0;
secp256k1_ecmult_gen(ctx, &rp, key);
secp256k1_ge_set_gej(&r, &rp);
if (compressed) {
if (flags & SECP256K1_EC_COMPRESSED) {
static const unsigned char begin[] = {
0x30,0x81,0xD3,0x02,0x01,0x01,0x04,0x20
};

2
src/modules/ecdh/tests_impl.h
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@ -31,7 +31,7 @@ void test_ecdh_generator_basepoint(void) {
CHECK(secp256k1_ecdh(ctx, output_ecdh, &point[0], s_b32) == 1);
/* compute "explicitly" */
CHECK(secp256k1_ec_pubkey_create(ctx, &point[1], s_b32) == 1);
CHECK(secp256k1_ec_pubkey_serialize(ctx, point_ser, &point_ser_len, &point[1], 1) == 1);
CHECK(secp256k1_ec_pubkey_serialize(ctx, point_ser, &point_ser_len, &point[1], SECP256K1_EC_COMPRESSED) == 1);
CHECK(point_ser_len == sizeof(point_ser));
secp256k1_sha256_initialize(&sha);
secp256k1_sha256_write(&sha, point_ser, point_ser_len);

8
src/secp256k1.c
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@ -154,12 +154,12 @@ int secp256k1_ec_pubkey_parse(const secp256k1_context_t* ctx, secp256k1_pubkey_t
return 1;
}
int secp256k1_ec_pubkey_serialize(const secp256k1_context_t* ctx, unsigned char *output, size_t *outputlen, const secp256k1_pubkey_t* pubkey, int compressed) {
int secp256k1_ec_pubkey_serialize(const secp256k1_context_t* ctx, unsigned char *output, size_t *outputlen, const secp256k1_pubkey_t* pubkey, unsigned int flags) {
secp256k1_ge_t Q;
(void)ctx;
return (secp256k1_pubkey_load(ctx, &Q, pubkey) &&
secp256k1_eckey_pubkey_serialize(&Q, output, outputlen, compressed));
secp256k1_eckey_pubkey_serialize(&Q, output, outputlen, flags));
}
static void secp256k1_ecdsa_signature_load(const secp256k1_context_t* ctx, secp256k1_scalar_t* r, secp256k1_scalar_t* s, const secp256k1_ecdsa_signature_t* sig) {
@ -438,7 +438,7 @@ int secp256k1_ec_pubkey_tweak_mul(const secp256k1_context_t* ctx, secp256k1_pubk
return ret;
}
int secp256k1_ec_privkey_export(const secp256k1_context_t* ctx, unsigned char *privkey, size_t *privkeylen, const unsigned char *seckey, int compressed) {
int secp256k1_ec_privkey_export(const secp256k1_context_t* ctx, unsigned char *privkey, size_t *privkeylen, const unsigned char *seckey, unsigned int flags) {
secp256k1_scalar_t key;
int ret = 0;
VERIFY_CHECK(ctx != NULL);
@ -448,7 +448,7 @@ int secp256k1_ec_privkey_export(const secp256k1_context_t* ctx, unsigned char *p
ARG_CHECK(secp256k1_ecmult_gen_context_is_built(&ctx->ecmult_gen_ctx));
secp256k1_scalar_set_b32(&key, seckey, NULL);
ret = secp256k1_eckey_privkey_serialize(&ctx->ecmult_gen_ctx, privkey, privkeylen, &key, compressed);
ret = secp256k1_eckey_privkey_serialize(&ctx->ecmult_gen_ctx, privkey, privkeylen, &key, flags);
secp256k1_scalar_clear(&key);
return ret;
}

8
src/tests.c
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@ -1871,7 +1871,7 @@ void test_ecdsa_end_to_end(void) {
CHECK(secp256k1_ec_pubkey_parse(ctx, &pubkey, pubkeyc, pubkeyclen) == 1);
/* Verify private key import and export. */
CHECK(secp256k1_ec_privkey_export(ctx, seckey, &seckeylen, privkey, secp256k1_rand32() % 2) == 1);
CHECK(secp256k1_ec_privkey_export(ctx, seckey, &seckeylen, privkey, (secp256k1_rand32() % 2) == 1) ? SECP256K1_EC_COMPRESSED : 0);
CHECK(secp256k1_ec_privkey_import(ctx, privkey2, seckey, seckeylen) == 1);
CHECK(memcmp(privkey, privkey2, 32) == 0);
@ -1979,7 +1979,7 @@ void test_random_pubkeys(void) {
size_t size = len;
firstb = in[0];
/* If the pubkey can be parsed, it should round-trip... */
CHECK(secp256k1_eckey_pubkey_serialize(&elem, out, &size, len == 33));
CHECK(secp256k1_eckey_pubkey_serialize(&elem, out, &size, (len == 33) ? SECP256K1_EC_COMPRESSED : 0));
CHECK(size == len);
CHECK(memcmp(&in[1], &out[1], len-1) == 0);
/* ... except for the type of hybrid inputs. */
@ -2156,7 +2156,7 @@ void test_ecdsa_edge_cases(void) {
size_t outlen = 300;
CHECK(!secp256k1_ec_privkey_export(ctx, privkey, &outlen, seckey, 0));
outlen = 300;
CHECK(!secp256k1_ec_privkey_export(ctx, privkey, &outlen, seckey, 1));
CHECK(!secp256k1_ec_privkey_export(ctx, privkey, &outlen, seckey, SECP256K1_EC_COMPRESSED));
}
}
@ -2171,7 +2171,7 @@ EC_KEY *get_openssl_key(const secp256k1_scalar_t *key) {
const unsigned char* pbegin = privkey;
int compr = secp256k1_rand32() & 1;
EC_KEY *ec_key = EC_KEY_new_by_curve_name(NID_secp256k1);
CHECK(secp256k1_eckey_privkey_serialize(&ctx->ecmult_gen_ctx, privkey, &privkeylen, key, compr));
CHECK(secp256k1_eckey_privkey_serialize(&ctx->ecmult_gen_ctx, privkey, &privkeylen, key, compr ? SECP256K1_EC_COMPRESSED : 0));
CHECK(d2i_ECPrivateKey(&ec_key, &pbegin, privkeylen));
CHECK(EC_KEY_check_key(ec_key));
return ec_key;