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src/openssl/helpers.c: Adding signature serialize/unserialize functions.

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This commit is contained in:
Henrik Hautakoski 2023-03-22 14:34:47 +01:00
parent 073955ab50
commit 4aa94ebee9
1 changed files with 57 additions and 0 deletions
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57
src/openssl/helpers.c
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@ -24,6 +24,7 @@
#include <openssl/ec.h>
#include <openssl/bn.h>
#include <string.h>
// Calcualte a public key from a EC_KEY object.
int calculate_pubkey(const EC_GROUP *group, const EC_KEY *ec_key, EC_POINT **point) {
@ -41,4 +42,60 @@ int calculate_pubkey(const EC_GROUP *group, const EC_KEY *ec_key, EC_POINT **poi
// Multiply curve (group) and private key to get the public key.
return EC_POINT_mul(group, *point, pk, NULL, NULL, NULL);
}
int ECDSA_SIG_unserialize_rs(const unsigned char *sig, BIGNUM **r, BIGNUM **s, int *recid) {
*recid = sig[0] - 27 - 4;
if ((*r = BN_bin2bn(sig + 1, 32, NULL)) == NULL) {
return 0;
}
if ((*s = BN_bin2bn(sig + 33, 32, NULL)) == NULL) {
BN_free(*r);
return 0;
}
return 1;
}
int ECDSA_SIG_unserialize(const unsigned char *sig, ECDSA_SIG *ecdsa_sig, int *recid) {
BIGNUM *r, *s;
if (ECDSA_SIG_unserialize_rs(sig, &r, &s, recid) == 0) {
return 0;
}
if (ECDSA_SIG_set0(ecdsa_sig, r, s) == 0) {
BN_free(r);
BN_free(s);
return 0;
}
// r,s pointers are owned by ECDSA_SIG from this point.
// So we should not free them.
return 1;
}
int ECDSA_SIG_serialize(const ECDSA_SIG *ecdsa_sig, int recid, unsigned char* sig) {
unsigned char* der = NULL;
int bytes, ret = -1;
unsigned char lR, lS;
bytes = i2d_ECDSA_SIG( ecdsa_sig, &der );
lR = der[3];
lS = der[5+lR];
if (lR != 32 || lS != 32) goto err;
memcpy(sig + 1, &der[4], 32);
memcpy(sig + 33, &der[6+32], 32);
sig[0] = recid + 27 + 4;
ret = 0;
err:
free(der);
return ret;
}