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https://github.com/trezor/trezor-firmware.git
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introduce ecdsa_verify_digest
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parent
8aaebe761b
commit
fc144587e6
27
ecdsa.c
27
ecdsa.c
@ -423,18 +423,29 @@ int ecdsa_read_pubkey(const uint8_t *pub_key, curve_point *pub)
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// signature - 64 bytes signature
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// msg is a data that was signed
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// msg_len is the message length
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// returns 0 if verification succeeded
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// it is assumed that public key is valid otherwise calling this does not make much sense
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int ecdsa_verify(const uint8_t *pub_key, const uint8_t *sig, const uint8_t *msg, uint32_t msg_len)
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{
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int i, j;
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uint8_t hash[32];
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SHA256_Raw(msg, msg_len, hash);
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return ecdsa_verify_digest(pub_key, sig, hash);
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}
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int ecdsa_verify_double(const uint8_t *pub_key, const uint8_t *sig, const uint8_t *msg, uint32_t msg_len)
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{
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uint8_t hash[32];
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SHA256_Raw(msg, msg_len, hash);
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SHA256_Raw(hash, 32, hash);
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return ecdsa_verify_digest(pub_key, sig, hash);
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}
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// returns 0 if verification succeeded
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// it is assumed that public key is valid otherwise calling this does not make much sense
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int ecdsa_verify_digest(const uint8_t *pub_key, const uint8_t *sig, const uint8_t *digest)
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{
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int i, j;
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curve_point pub, res;
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bignum256 r, s, z;
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// compute hash function of message
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SHA256_Raw(msg, msg_len, hash);
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// if double hash is required uncomment the following line:
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// SHA256_Raw(hash, 32, hash);
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if (!ecdsa_read_pubkey(pub_key, &pub)) {
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return 1;
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@ -443,7 +454,7 @@ int ecdsa_verify(const uint8_t *pub_key, const uint8_t *sig, const uint8_t *msg,
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bn_read_be(sig, &r);
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bn_read_be(sig + 32, &s);
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bn_read_be(hash, &z);
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bn_read_be(digest, &z);
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if (bn_is_zero(&r) || bn_is_zero(&s) ||
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(!bn_is_less(&r, &order256k1)) ||
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2
ecdsa.h
2
ecdsa.h
@ -46,6 +46,8 @@ void ecdsa_get_address(const uint8_t *pub_key, uint8_t version, char *addr);
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int ecdsa_address_decode(const char *addr, uint8_t *out);
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int ecdsa_read_pubkey(const uint8_t *pub_key, curve_point *pub);
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int ecdsa_verify(const uint8_t *pub_key, const uint8_t *sig, const uint8_t *msg, uint32_t msg_len);
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int ecdsa_verify_double(const uint8_t *pub_key, const uint8_t *sig, const uint8_t *msg, uint32_t msg_len);
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int ecdsa_verify_digest(const uint8_t *pub_key, const uint8_t *sig, const uint8_t *digest);
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int ecdsa_sig_to_der(const uint8_t *sig, uint8_t *der);
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#endif
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