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61bfff1dac
Add WOLF_CRYPTO_CB_ONLY_SHA256: when set, the SHA-256 software. wc_Sha256FinalRaw is reduced to a stub returning NO_VALID_DEVID, and sha256.h force-defines WOLFSSL_NO_HASH_RAW so the constant-time TLS HMAC path falls back to its backend-opaque variant. Incompatible with WOLFSSL_SHA224, which aliases the SHA-256 statics; #error guard added. Add wc_swdev support for SHA-256 for testing.