kSecKeyAlgorithmRSASignatureDigestPKCS1v15SHA224

objc2_security

Static kSecKeyAlgorithmRSASignatureDigestPKCS1v15SHA224 

Source 
pub unsafe static kSecKeyAlgorithmRSASignatureDigestPKCS1v15SHA224: &'static SecKeyAlgorithm
Available on crate feature SecKey only.
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Apple’s documentation