librustls: add RUSTLS_RESULT_CERT_UNSUPPORTED_SIGNATURE_ALGORITHM

Adds a new `rustls_result` matching the new upstream
`CertificateError::UnsupportedSignatureAlgorithm`.

Author: cpu

librustls/src/error.rs

@@ -106,7 +106,8 @@ u32_enum_builder! {
         CertApplicationVerificationFailure => 7130,
         CertOtherError => 7131,
         CertUnknownRevocationStatus => 7154,
-        CertExpiredRevocationList => 7156, // Last added.
+        CertExpiredRevocationList => 7156,
+        CertUnsupportedSignatureAlgorithm => 7157, // Last added.
 
         // From InvalidMessage, with fields that get flattened.
         // https://docs.rs/rustls/0.21.0/rustls/enum.Error.html#variant.InvalidMessage
@@ -341,6 +342,9 @@ impl Display for rustls_result {
             }
             CertUnknownIssuer => Error::InvalidCertificate(CertificateError::UnknownIssuer).fmt(f),
             CertBadSignature => Error::InvalidCertificate(CertificateError::BadSignature).fmt(f),
+            CertUnsupportedSignatureAlgorithm => {
+                Error::InvalidCertificate(CertificateError::UnsupportedSignatureAlgorithm).fmt(f)
+            }
             CertNotValidForName => {
                 Error::InvalidCertificate(CertificateError::NotValidForName).fmt(f)
             }
@@ -740,6 +744,7 @@ fn map_invalid_certificate_error(err: CertificateError) -> rustls_result {
         CertificateError::ExpiredRevocationList
         | CertificateError::ExpiredRevocationListContext { .. } => CertExpiredRevocationList,
         CertificateError::BadSignature => CertBadSignature,
+        CertificateError::UnsupportedSignatureAlgorithm => CertUnsupportedSignatureAlgorithm,
         CertificateError::NotValidForName | CertificateError::NotValidForNameContext { .. } => {
             CertNotValidForName
         }

librustls/src/rustls.h

@@ -90,6 +90,7 @@ enum rustls_result {
   RUSTLS_RESULT_CERT_OTHER_ERROR = 7131,
   RUSTLS_RESULT_CERT_UNKNOWN_REVOCATION_STATUS = 7154,
   RUSTLS_RESULT_CERT_EXPIRED_REVOCATION_LIST = 7156,
+  RUSTLS_RESULT_CERT_UNSUPPORTED_SIGNATURE_ALGORITHM = 7157,
   RUSTLS_RESULT_MESSAGE_HANDSHAKE_PAYLOAD_TOO_LARGE = 7133,
   RUSTLS_RESULT_MESSAGE_INVALID_CCS = 7134,
   RUSTLS_RESULT_MESSAGE_INVALID_CONTENT_TYPE = 7135,