wip: migrate to mono-repo. SPN has already been moved to spn/

service/process/executable.go

@@ -0,0 +1,41 @@
+package process
+
+import (
+	"crypto"
+	"encoding/hex"
+	"hash"
+	"io"
+	"os"
+)
+
+// GetExecHash returns the hash of the executable with the given algorithm.
+func (p *Process) GetExecHash(algorithm string) (string, error) {
+	sum, ok := p.ExecHashes[algorithm]
+	if ok {
+		return sum, nil
+	}
+
+	var hasher hash.Hash
+	switch algorithm {
+	case "md5":
+		hasher = crypto.MD5.New()
+	case "sha1":
+		hasher = crypto.SHA1.New()
+	case "sha256":
+		hasher = crypto.SHA256.New()
+	}
+
+	file, err := os.Open(p.Path)
+	if err != nil {
+		return "", err
+	}
+
+	_, err = io.Copy(hasher, file)
+	if err != nil {
+		return "", err
+	}
+
+	sum = hex.EncodeToString(hasher.Sum(nil))
+	p.ExecHashes[algorithm] = sum
+	return sum, nil
+}