Build failure under Windows 10

[sanmai-NL]

crypto-hash v. 0.3.1. fails to build for me. I used Windows 10 Enterprise build 17763.rs5_release.180914-1434. You can download a VM with this environment at https://developer.microsoft.com/en-us/windows/downloads/virtual-machines .

rustc output:

thread 'main' panicked at 'failed unsafe {
    CryptAcquireContextW(&mut hcp, ptr::null(), ptr::null(), PROV_RSA_AES,
                         CRYPT_VERIFYCONTEXT | CRYPT_SILENT)
}: Provider DLL failed to initialize correctly. (os error -2146893795)', C:\Users\appveyor\.cargo\registry\src\github.jparrowsec.cn-1ecc6299db9ec823\crypto-hash-0.3.1\src\imp\cryptoapi.rs:91:9

[malept]

• Does it fail to build, or cause a panic at runtime?
• What version of Rust are you compiling with?
• v0.3.1 is not the latest version of crypto-hash. Can you please try the latest version?
• Is this only with Windows 10 Enterprise? What about other versions of Windows 10?
• Can you please provide detailed steps to reproduce your error, and a more detailed console output?

[sanmai-NL]

• The panic is reported from custom build tooling, it seems to originate from a cargo invocation.
• A recent nightly. More details later, if you need them.
• v0.3.1. is a dependency, I can't switch it out easily.
• I do not know.
• There is no more relevant output. I will try to build a reproduction then.

[sanmai-NL]

The reverse dependency is on Cargo. The Cargo binary fails to use crypto-hash. I cannot upgrade the version easily then.

[sanmai-NL]

I solved it. The problem was that Cargo was invoked with a clear environment. This works fine under other OSes, but not under Windows. This is a bug in the standard library (rust-lang/rust#31259).