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src: fix CSPRNG when length exceeds INT_MAX #47515

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Apr 15, 2023
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src: fix CSPRNG when length exceeds INT_MAX #47515

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14 changes: 12 additions & 2 deletions src/crypto/crypto_util.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -61,10 +61,20 @@ int VerifyCallback(int preverify_ok, X509_STORE_CTX* ctx) {
}

MUST_USE_RESULT CSPRNGResult CSPRNG(void* buffer, size_t length) {
unsigned char* buf = static_cast<unsigned char*>(buffer);
do {
if (1 == RAND_status())
if (1 == RAND_bytes(static_cast<unsigned char*>(buffer), length))
if (1 == RAND_status()) {
#if OPENSSL_VERSION_MAJOR >= 3
if (1 == RAND_bytes_ex(nullptr, buf, length, 0)) return {true};
#else
while (length > INT_MAX && 1 == RAND_bytes(buf, INT_MAX)) {
buf += INT_MAX;
length -= INT_MAX;
}
if (length <= INT_MAX && 1 == RAND_bytes(buf, static_cast<int>(length)))
return {true};
#endif
}
#if OPENSSL_VERSION_MAJOR >= 3
const auto code = ERR_peek_last_error();
// A misconfigured OpenSSL 3 installation may report 1 from RAND_poll()
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