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Much of what NIST publishes about cryptographic algorithms is in Special Publications. In this case it is SP 800-131 (pdf) where they describe transitioning away from old algorithms and key sizes. Pages 14-15 have the hash function specific information: SHA-1 for digital signature generation: SHA-1 may only be used for ...
PGP key formats are defined in RFC 4880. Specifically, section 5.5. The private key format includes the public key and quite a bit of other information in unencrypted form. It might be easier to add another layer of encryption on top of that before you use steganography.
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