Encrypted credentials produced by systemd-creds are stored as Base64. Decode them before decrypting in read_credential_with_decryption(), while leaving plaintext credentials unchanged and retaining their precedence. Bound the decoded encrypted input and report oversized credentials explicitly. Match the plaintext reader's string semantics by rejecting embedded NUL bytes when no size output is requested, while preserving binary payloads for callers that request their size. Add regression coverage for missing and malformed credentials, plaintext precedence, decoded size boundaries, single-line and wrapped Base64, empty strings, and binary data. Keep test outputs and host secrets scoped to private fixtures. Fixes #43621
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