kernel/linux.git/lib/crypto/sha512.c, branch v6.18.22

lib/crypto: sha2: Add hmac_sha*_init_usingrawkey()

2025-07-14T15:20:37+00:00

While the HMAC library functions support both incremental and one-shot computation and both prepared and raw keys, the combination of raw key + incremental was missing. It turns out that several potential users of the HMAC library functions (tpm2-sessions.c, smb2transport.c, trusted_tpm1.c) want exactly that. Therefore, add the missing functions hmac_sha*_init_usingrawkey(). Implement them in an optimized way that directly initializes the HMAC context without a separate key preparation step. Reimplement the one-shot raw key functions hmac_sha*_usingrawkey() on top of the new functions, which makes them a bit more efficient. Reviewed-by: Ard Biesheuvel Link: https://lore.kernel.org/r/20250711215844.41715-1-ebiggers@kernel.org Signed-off-by: Eric Biggers

lib/crypto: sha512: Add HMAC-SHA384 and HMAC-SHA512 support

2025-06-30T16:26:19+00:00

Since HMAC support is commonly needed and is fairly simple, include it as a first-class citizen of the SHA-512 library. The API supports both incremental and one-shot computation, and either preparing the key ahead of time or just using a raw key. The implementation is much more streamlined than crypto/hmac.c. Acked-by: Ard Biesheuvel Link: https://lore.kernel.org/r/20250630160320.2888-4-ebiggers@kernel.org Signed-off-by: Eric Biggers

lib/crypto: sha512: Add support for SHA-384 and SHA-512

2025-06-30T16:26:19+00:00

Add basic support for SHA-384 and SHA-512 to lib/crypto/. Various in-kernel users will be able to use this instead of the old-school crypto API, which is harder to use and has more overhead. The basic support added by this commit consists of the API and its documentation, backed by a C implementation of the algorithms. sha512_block_generic() is derived from crypto/sha512_generic.c. Acked-by: Ard Biesheuvel Link: https://lore.kernel.org/r/20250630160320.2888-3-ebiggers@kernel.org Signed-off-by: Eric Biggers