[PATCH 2/8] digest: introduce digest_{init/update/final/length}

[Jean-Christophe PLAGNIOL-VILLARD]

This will allow to move from a one at a time digest to a multi-instance
with too much impact on the code using it

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
 commands/digest.c |  4 ++--
 common/password.c | 26 +++++++++++++-------------
 crypto/digest.c   |  6 +++---
 include/digest.h  | 21 +++++++++++++++++++++
 4 files changed, 39 insertions(+), 18 deletions(-)

diff --git a/commands/digest.c b/commands/digest.c
index 092fda2..bad7d3f 100644
--- a/commands/digest.c
+++ b/commands/digest.c
@@ -39,7 +39,7 @@ static int do_digest(char *algorithm, int argc, char *argv[])
 	if (argc < 2)
 		return COMMAND_ERROR_USAGE;
 
-	hash = calloc(d->length, sizeof(unsigned char));
+	hash = calloc(digest_length(d), sizeof(unsigned char));
 	if (!hash) {
 		perror("calloc");
 		return COMMAND_ERROR_USAGE;
@@ -60,7 +60,7 @@ static int do_digest(char *algorithm, int argc, char *argv[])
 		if (digest_file_window(d, filename, hash, start, size) < 0) {
 			ret = 1;
 		} else {
-			for (i = 0; i < d->length; i++)
+			for (i = 0; i < digest_length(d); i++)
 				printf("%02x", hash[i]);
 
 			printf("  %s\t0x%08llx ... 0x%08llx\n",
diff --git a/common/password.c b/common/password.c
index 111c139..1606109 100644
--- a/common/password.c
+++ b/common/password.c
@@ -282,33 +282,33 @@ static int __check_passwd(unsigned char* passwd, size_t length, int std)
 
 	d = digest_get_by_name(PASSWD_SUM);
 
-	passwd1_sum = calloc(d->length, sizeof(unsigned char));
+	passwd1_sum = calloc(digest_length(d), sizeof(unsigned char));
 
 	if (!passwd1_sum)
 		return -ENOMEM;
 
-	passwd2_sum = calloc(d->length, sizeof(unsigned char));
+	passwd2_sum = calloc(digest_length(d), sizeof(unsigned char));
 
 	if (!passwd2_sum) {
 		ret = -ENOMEM;
 		goto err1;
 	}
 
-	d->init(d);
+	digest_init(d);
 
-	d->update(d, passwd, length);
+	digest_update(d, passwd, length);
 
-	d->final(d, passwd1_sum);
+	digest_final(d, passwd1_sum);
 
 	if (std)
-		ret = read_env_passwd(passwd2_sum, d->length);
+		ret = read_env_passwd(passwd2_sum, digest_length(d));
 	else
-		ret = read_default_passwd(passwd2_sum, d->length);
+		ret = read_default_passwd(passwd2_sum, digest_length(d));
 
 	if (ret < 0)
 		goto err2;
 
-	if (strncmp(passwd1_sum, passwd2_sum, d->length) == 0)
+	if (strncmp(passwd1_sum, passwd2_sum, digest_length(d)) == 0)
 		ret = 1;
 
 err2:
@@ -349,18 +349,18 @@ int set_env_passwd(unsigned char* passwd, size_t length)
 
 	d = digest_get_by_name(PASSWD_SUM);
 
-	passwd_sum = calloc(d->length, sizeof(unsigned char));
+	passwd_sum = calloc(digest_length(d), sizeof(unsigned char));
 
 	if (!passwd_sum)
 		return -ENOMEM;
 
-	d->init(d);
+	digest_init(d);
 
-	d->update(d, passwd, length);
+	digest_update(d, passwd, length);
 
-	d->final(d, passwd_sum);
+	digest_final(d, passwd_sum);
 
-	ret = write_env_passwd(passwd_sum, d->length);
+	ret = write_env_passwd(passwd_sum, digest_length(d));
 
 	free(passwd_sum);
 
diff --git a/crypto/digest.c b/crypto/digest.c
index ae414ba..789c0b2 100644
--- a/crypto/digest.c
+++ b/crypto/digest.c
@@ -84,7 +84,7 @@ int digest_file_window(struct digest *d, char *filename,
 	unsigned char *buf;
 	int flags = 0;
 
-	d->init(d);
+	digest_init(d);
 
 	fd = open(filename, O_RDONLY);
 	if (fd < 0) {
@@ -128,12 +128,12 @@ int digest_file_window(struct digest *d, char *filename,
 			goto out_free;
 		}
 
-		d->update(d, buf, now);
+		digest_update(d, buf, now);
 		size -= now;
 		len += now;
 	}
 
-	d->final(d, hash);
+	digest_final(d, hash);
 
 out_free:
 	if (flags)
diff --git a/include/digest.h b/include/digest.h
index 8563c10..208a463 100644
--- a/include/digest.h
+++ b/include/digest.h
@@ -50,4 +50,25 @@ int digest_file(struct digest *d, char *filename,
 int digest_file_by_name(char *algo, char *filename,
 		       unsigned char *hash);
 
+static inline int digest_init(struct digest *d)
+{
+	return d->init(d);
+}
+
+static inline int digest_update(struct digest *d, const void *data,
+				      unsigned long len)
+{
+	return d->update(d, data, len);
+}
+
+static inline int digest_final(struct digest *d, unsigned char *md)
+{
+	return d->final(d, md);
+}
+
+static inline int digest_length(struct digest *d)
+{
+	return d->length;
+}
+
 #endif /* __SH_ST_DEVICES_H__ */
-- 
2.1.4