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Improve examples/documentation: remove key generation loops

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Co-Authored by: Sebastian Falbesoner <sebastian.falbesoner@gmail.com>
This commit is contained in:
cheapshot003
2024-08-29 22:24:20 +02:00
parent 1988855079
commit cd4f84f3ba
5 changed files with 46 additions and 51 deletions
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14
examples/ecdh.c
View File

@@ -42,18 +42,16 @@ int main(void) {
assert(return_val);
/*** Key Generation ***/
/* If the secret key is zero or out of range (bigger than secp256k1's
* order), we try to sample a new key. Note that the probability of this
* happening is negligible. */
while (1) {
if (!fill_random(seckey1, sizeof(seckey1)) || !fill_random(seckey2, sizeof(seckey2))) {
printf("Failed to generate randomness\n");
return 1;
}
if (secp256k1_ec_seckey_verify(ctx, seckey1) && secp256k1_ec_seckey_verify(ctx, seckey2)) {
break;
}
/* If the secret key is zero or out of range (greater than secp256k1's
* order), we fail. Note that the probability of this occurring
* is negligible with a properly functioning random number generator. */
if (!secp256k1_ec_seckey_verify(ctx, seckey1) || !secp256k1_ec_seckey_verify(ctx, seckey2)) {
printf("Generated secret key is invalid. This indicates an issue with the random number generator.\n");
return 1;
}
/* Public key creation using a valid context with a verified secret key should never fail */

14
examples/ecdsa.c
View File

@@ -49,18 +49,16 @@ int main(void) {
assert(return_val);
/*** Key Generation ***/
/* If the secret key is zero or out of range (bigger than secp256k1's
* order), we try to sample a new key. Note that the probability of this
* happening is negligible. */
while (1) {
/* If the secret key is zero or out of range (greater than secp256k1's
* order), we return 1. Note that the probability of this occurring
* is negligible with a properly functioning random number generator. */
if (!fill_random(seckey, sizeof(seckey))) {
printf("Failed to generate randomness\n");
return 1;
}
if (secp256k1_ec_seckey_verify(ctx, seckey)) {
break;
}
if (!secp256k1_ec_seckey_verify(ctx, seckey)) {
printf("Generated secret key is invalid. This indicates an issue with the random number generator.\n");
return 1;
}
/* Public key creation using a valid context with a verified secret key should never fail */

13
examples/ellswift.c
View File

@@ -48,17 +48,16 @@ int main(void) {
/*** Generate secret keys ***/
/* If the secret key is zero or out of range (bigger than secp256k1's
* order), we try to sample a new key. Note that the probability of this
* happening is negligible. */
while (1) {
/* If the secret key is zero or out of range (greater than secp256k1's
* order), we return 1. Note that the probability of this occurring
* is negligible with a properly functioning random number generator. */
if (!fill_random(seckey1, sizeof(seckey1)) || !fill_random(seckey2, sizeof(seckey2))) {
printf("Failed to generate randomness\n");
return 1;
}
if (secp256k1_ec_seckey_verify(ctx, seckey1) && secp256k1_ec_seckey_verify(ctx, seckey2)) {
break;
}
if (!secp256k1_ec_seckey_verify(ctx, seckey1) || !secp256k1_ec_seckey_verify(ctx, seckey2)) {
printf("Generated secret key is invalid. This indicates an issue with the random number generator.\n");
return 1;
}
/* Generate ElligatorSwift public keys. This should never fail with valid context and

14
examples/schnorr.c
View File

@@ -43,20 +43,18 @@ int main(void) {
assert(return_val);
/*** Key Generation ***/
/* If the secret key is zero or out of range (bigger than secp256k1's
* order), we try to sample a new key. Note that the probability of this
* happening is negligible. */
while (1) {
/* If the secret key is zero or out of range (greater than secp256k1's
* order), we return 1. Note that the probability of this occurring
* is negligible with a properly functioning random number generator. */
if (!fill_random(seckey, sizeof(seckey))) {
printf("Failed to generate randomness\n");
return 1;
}
/* Try to create a keypair with a valid context, it should only fail if
* the secret key is zero or out of range. */
if (secp256k1_keypair_create(ctx, &keypair, seckey)) {
break;
}
if (!secp256k1_keypair_create(ctx, &keypair, seckey)) {
printf("Generated secret key is invalid. This indicates an issue with the random number generator.\n");
return 1;
}
/* Extract the X-only public key from the keypair. We pass NULL for

6
include/secp256k1.h
View File

@@ -679,12 +679,14 @@ SECP256K1_API int secp256k1_ecdsa_sign(
const void *ndata
) SECP256K1_ARG_NONNULL(1) SECP256K1_ARG_NONNULL(2) SECP256K1_ARG_NONNULL(3) SECP256K1_ARG_NONNULL(4);
/** Verify an ECDSA secret key.
/** Verify an elliptic curve secret key.
*
* A secret key is valid if it is not 0 and less than the secp256k1 curve order
* when interpreted as an integer (most significant byte first). The
* probability of choosing a 32-byte string uniformly at random which is an
* invalid secret key is negligible.
* invalid secret key is negligible. However, if it does happen it should
* be assumed that the randomness source is severely broken and there should
* be no retry.
*
* Returns: 1: secret key is valid
* 0: secret key is invalid