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* LocalIdentity:: writeTo( array ) and readFrom (array )

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This commit is contained in:
Scott Powell
2025-01-16 01:59:11 +11:00
parent ec92bfa6b1
commit 86f11d08aa
6 changed files with 37 additions and 0 deletions
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2
examples/simple_repeater/main.cpp
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@@ -330,6 +330,8 @@ void setup() {
halt();
}
radio.setCRC(0);
#ifdef SX126X_CURRENT_LIMIT
radio.setCurrentLimit(SX126X_CURRENT_LIMIT);
#endif

2
examples/simple_secure_chat/main.cpp
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@@ -277,6 +277,8 @@ void setup() {
halt();
}
radio.setCRC(0);
#ifdef SX126X_CURRENT_LIMIT
radio.setCurrentLimit(SX126X_CURRENT_LIMIT);
#endif

1
lib/ed25519/ed_25519.h
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@@ -27,6 +27,7 @@ int ED25519_DECLSPEC ed25519_create_seed(unsigned char *seed);
#endif
void ED25519_DECLSPEC ed25519_create_keypair(unsigned char *public_key, unsigned char *private_key, const unsigned char *seed);
void ED25519_DECLSPEC ed25519_derive_pub(unsigned char *public_key, const unsigned char *private_key);
void ED25519_DECLSPEC ed25519_sign(unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *public_key, const unsigned char *private_key);
int ED25519_DECLSPEC ed25519_verify(const unsigned char *signature, const unsigned char *message, size_t message_len, const unsigned char *public_key);
void ED25519_DECLSPEC ed25519_add_scalar(unsigned char *public_key, unsigned char *private_key, const unsigned char *scalar);

7
lib/ed25519/keypair.c
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@@ -14,3 +14,10 @@ void ed25519_create_keypair(unsigned char *public_key, unsigned char *private_ke
ge_scalarmult_base(&A, private_key);
ge_p3_tobytes(public_key, &A);
}
void ed25519_derive_pub(unsigned char *public_key, const unsigned char *private_key) {
ge_p3 A;
ge_scalarmult_base(&A, private_key);
ge_p3_tobytes(public_key, &A);
}

23
src/Identity.cpp
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@@ -59,6 +59,29 @@ void LocalIdentity::printTo(Stream& s) const {
s.print("prv_key: "); Utils::printHex(s, prv_key, PRV_KEY_SIZE); s.println();
}
size_t LocalIdentity::writeTo(uint8_t* dest, size_t max_len) {
if (max_len < PRV_KEY_SIZE) return 0; // not big enough
if (max_len < PRV_KEY_SIZE + PUB_KEY_SIZE) { // only room for prv_key
memcpy(dest, prv_key, PRV_KEY_SIZE);
return PRV_KEY_SIZE;
}
memcpy(dest, prv_key, PRV_KEY_SIZE); // otherwise can fit prv + pub keys
memcpy(&dest[PRV_KEY_SIZE], pub_key, PUB_KEY_SIZE);
return PRV_KEY_SIZE + PUB_KEY_SIZE;
}
void LocalIdentity::readFrom(const uint8_t* src, size_t len) {
if (len == PRV_KEY_SIZE + PUB_KEY_SIZE) { // has prv + pub keys
memcpy(prv_key, src, PRV_KEY_SIZE);
memcpy(pub_key, &src[PRV_KEY_SIZE], PUB_KEY_SIZE);
} else if (len == PRV_KEY_SIZE) {
memcpy(prv_key, src, PRV_KEY_SIZE);
// now need to re-calculate the pub_key
ed25519_derive_pub(pub_key, prv_key);
}
}
void LocalIdentity::sign(uint8_t* sig, const uint8_t* message, int msg_len) const {
ed25519_sign(sig, message, msg_len, pub_key, prv_key);
}

2
src/Identity.h
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@@ -76,6 +76,8 @@ public:
bool readFrom(Stream& s);
bool writeTo(Stream& s) const;
void printTo(Stream& s) const;
size_t writeTo(uint8_t* dest, size_t max_len);
void readFrom(const uint8_t* src, size_t len);
};
}