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Implement sign and verify in crypto.

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This commit is contained in:
Fabio Alessandrelli 2020-06-06 15:42:46 +02:00
parent 09af27fa39
commit 09b9e65688
4 changed files with 54 additions and 0 deletions
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45
modules/mbedtls/crypto_mbedtls.cpp
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@ -320,3 +320,48 @@ PoolByteArray CryptoMbedTLS::generate_random_bytes(int p_bytes) {
mbedtls_ctr_drbg_random(&ctr_drbg, out.write().ptr(), p_bytes);
return out;
}
mbedtls_md_type_t CryptoMbedTLS::_md_type_from_hashtype(HashingContext::HashType p_hash_type, int &r_size) {
switch (p_hash_type) {
case HashingContext::HASH_MD5:
r_size = 16;
return MBEDTLS_MD_MD5;
case HashingContext::HASH_SHA1:
r_size = 20;
return MBEDTLS_MD_SHA1;
case HashingContext::HASH_SHA256:
r_size = 32;
return MBEDTLS_MD_SHA256;
default:
r_size = 0;
ERR_FAIL_V_MSG(MBEDTLS_MD_NONE, "Invalid hash type.");
}
}
Vector<uint8_t> CryptoMbedTLS::sign(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Ref<CryptoKey> p_key) {
int size;
mbedtls_md_type_t type = _md_type_from_hashtype(p_hash_type, size);
ERR_FAIL_COND_V_MSG(type == MBEDTLS_MD_NONE, Vector<uint8_t>(), "Invalid hash type.");
ERR_FAIL_COND_V_MSG(p_hash.size() != size, Vector<uint8_t>(), "Invalid hash provided. Size must be " + itos(size));
Ref<CryptoKeyMbedTLS> key = static_cast<Ref<CryptoKeyMbedTLS> >(p_key);
ERR_FAIL_COND_V_MSG(!key.is_valid(), Vector<uint8_t>(), "Invalid key provided.");
ERR_FAIL_COND_V_MSG(key->is_public_only(), Vector<uint8_t>(), "Invalid key provided. Cannot sign with public_only keys.");
size_t sig_size = 0;
unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
Vector<uint8_t> out;
int ret = mbedtls_pk_sign(&(key->pkey), type, p_hash.ptr(), size, buf, &sig_size, mbedtls_ctr_drbg_random, &ctr_drbg);
ERR_FAIL_COND_V_MSG(ret, out, "Error while signing: " + itos(ret));
out.resize(sig_size);
copymem(out.ptrw(), buf, sig_size);
return out;
}
bool CryptoMbedTLS::verify(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Vector<uint8_t> p_signature, Ref<CryptoKey> p_key) {
int size;
mbedtls_md_type_t type = _md_type_from_hashtype(p_hash_type, size);
ERR_FAIL_COND_V_MSG(type == MBEDTLS_MD_NONE, false, "Invalid hash type.");
ERR_FAIL_COND_V_MSG(p_hash.size() != size, false, "Invalid hash provided. Size must be " + itos(size));
Ref<CryptoKeyMbedTLS> key = static_cast<Ref<CryptoKeyMbedTLS> >(p_key);
ERR_FAIL_COND_V_MSG(!key.is_valid(), false, "Invalid key provided.");
return mbedtls_pk_verify(&(key->pkey), type, p_hash.ptr(), size, p_signature.ptr(), p_signature.size()) == 0;
}