commit e9ba3467c2b7dd17437afd611e1f2c98da726750
from: Omar Polo <op@omarpolo.com>
date: Sat Feb 04 13:58:02 2023 UTC

provide functions to parse/serialize sha256 digests

commit - 69c6accf47680d70def917cbab0e761177d8264b
commit + e9ba3467c2b7dd17437afd611e1f2c98da726750
blob - 141cb2590fa14834c63381929a0a7438ae3e4556
blob + faf9e8a717096264c717436f464e9b6cbf22d64e
--- lib/got_lib_sha1.h
+++ lib/got_lib_sha1.h
@@ -15,7 +15,12 @@
  */
 
 #define GOT_SHA1_STRING_ZERO "0000000000000000000000000000000000000000"
+#define GOT_SHA256_STRING_ZERO "0000000000000000000000000000000000000000000000000000000000000000"
 
 int got_parse_xdigit(uint8_t *, const char *);
+
 int got_parse_sha1_digest(uint8_t *, const char *);
 char *got_sha1_digest_to_str(const uint8_t *, char *, size_t);
+
+int got_parse_sha256_digest(uint8_t *, const char *);
+char *got_sha256_digest_to_str(const uint8_t *, char *, size_t);
blob - ee835ad4c90671b4fd6fd88951b7b5c716f05bce
blob + 78088ef7e3d68c1934326f353ffd25066d280bfe
--- lib/sha1.c
+++ lib/sha1.c
@@ -83,3 +83,46 @@ got_sha1_digest_to_str(const uint8_t *digest, char *bu
 
 	return buf;
 }
+
+int
+got_parse_sha256_digest(uint8_t *digest, const char *line)
+{
+	uint8_t b = 0;
+	char hex[3] = {'\0', '\0', '\0'};
+	int i, j;
+
+	for (i = 0; i < SHA256_DIGEST_LENGTH; i++) {
+		if (line[0] == '\0' || line[1] == '\0')
+			return 0;
+		for (j = 0; j < 2; j++) {
+			hex[j] = *line;
+			line++;
+		}
+		if (!got_parse_xdigit(&b, hex))
+			return 0;
+		digest[i] = b;
+	}
+
+	return 1;
+}
+
+char *
+got_sha256_digest_to_str(const uint8_t *digest, char *buf, size_t size)
+{
+	char *p = buf;
+	char hex[3];
+	int i;
+
+	if (size < SHA256_DIGEST_STRING_LENGTH)
+		return NULL;
+
+	for (i = 0; i < SHA256_DIGEST_LENGTH; i++) {
+		snprintf(hex, sizeof(hex), "%.2x", digest[i]);
+		p[0] = hex[0];
+		p[1] = hex[1];
+		p += 2;
+	}
+	p[0] = '\0';
+
+	return buf;
+}