add sha256 syscall (#12569)

programs/bpf/rust/sha256/Cargo.toml

@@ -0,0 +1,26 @@
+
+# Note: This crate must be built using do.sh
+
+[package]
+name = "solana-bpf-rust-sha256"
+version = "1.4.0"
+description = "Solana BPF test program written in Rust"
+authors = ["Solana Maintainers <maintainers@solana.foundation>"]
+repository = "https://github.com/solana-labs/solana"
+license = "Apache-2.0"
+homepage = "https://solana.com/"
+edition = "2018"
+
+[dependencies]
+solana-sdk = { path = "../../../../sdk/", version = "1.4.0", default-features = false }
+
+[features]
+program = ["solana-sdk/program"]
+default = ["program", "solana-sdk/default"]
+
+[lib]
+name = "solana_bpf_rust_sha256"
+crate-type = ["cdylib"]
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]

programs/bpf/rust/sha256/Xargo.toml

@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []

programs/bpf/rust/sha256/src/lib.rs

@@ -0,0 +1,19 @@
+//! @brief SHA256 Syscall test
+
+extern crate solana_sdk;
+use solana_sdk::{
+    hash::{hashv, Hasher},
+    info,
+};
+
+#[no_mangle]
+pub extern "C" fn entrypoint(_input: *mut u8) -> u64 {
+    info!("sha256");
+
+    let vals = &["Gaggablaghblagh!".as_ref(), "flurbos".as_ref()];
+    let mut hasher = Hasher::default();
+    hasher.hashv(vals);
+    assert_eq!(hashv(vals), hasher.result());
+
+    0
+}