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//! SHA1-HMAC implementation using RustCrypto.
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use hmac::{Hmac, Mac};
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use sha1::Sha1;
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use str0m_proto::crypto::Sha1HmacProvider;
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type HmacSha1 = Hmac<Sha1>;
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// ============================================================================
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// SHA1 HMAC Provider Implementation
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// ============================================================================
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pub(super) struct RustCryptoSha1HmacProvider;
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impl std::fmt::Debug for RustCryptoSha1HmacProvider {
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    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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        f.debug_struct("RustCryptoSha1HmacProvider").finish()
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    }
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}
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impl Sha1HmacProvider for RustCryptoSha1HmacProvider {
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    fn sha1_hmac(&self, key: &[u8], payloads: &[&[u8]]) -> [u8; 20] {
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        let mut mac = HmacSha1::new_from_slice(key).expect("HMAC can take key of any size");
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        for payload in payloads {
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            mac.update(payload);
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        }
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        let result = mac.finalize();
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        let bytes = result.into_bytes();
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        let mut output = [0u8; 20];
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        output.copy_from_slice(&bytes);
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        output
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    }
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}