diff --git a/crypto/sha2.c b/crypto/sha2.c
index f280e1fdd9..5aa0ea38cb 100644
--- a/crypto/sha2.c
+++ b/crypto/sha2.c
@@ -577,7 +577,7 @@ void sha1_Update(SHA1_CTX* context, const sha2_byte *data, size_t len) {
 	usedspace = freespace = 0;
 }
 
-void sha1_Final(SHA1_CTX* context, sha2_byte digest[]) {
+void sha1_Final(SHA1_CTX* context, sha2_byte digest[SHA1_DIGEST_LENGTH]) {
 	unsigned int	usedspace = 0;
 
 	/* If no digest buffer is passed, we don't bother doing this: */
@@ -631,7 +631,7 @@ void sha1_Final(SHA1_CTX* context, sha2_byte digest[]) {
 	usedspace = 0;
 }
 
-char *sha1_End(SHA1_CTX* context, char buffer[]) {
+char *sha1_End(SHA1_CTX* context, char buffer[SHA1_DIGEST_STRING_LENGTH]) {
 	sha2_byte	digest[SHA1_DIGEST_LENGTH] = {0}, *d = digest;
 	int		i = 0;
 
@@ -884,7 +884,7 @@ void sha256_Update(SHA256_CTX* context, const sha2_byte *data, size_t len) {
 	usedspace = freespace = 0;
 }
 
-void sha256_Final(SHA256_CTX* context, sha2_byte digest[]) {
+void sha256_Final(SHA256_CTX* context, sha2_byte digest[SHA256_DIGEST_LENGTH]) {
 	unsigned int	usedspace = 0;
 
 	/* If no digest buffer is passed, we don't bother doing this: */
@@ -938,7 +938,7 @@ void sha256_Final(SHA256_CTX* context, sha2_byte digest[]) {
 	usedspace = 0;
 }
 
-char *sha256_End(SHA256_CTX* context, char buffer[]) {
+char *sha256_End(SHA256_CTX* context, char buffer[SHA256_DIGEST_STRING_LENGTH]) {
 	sha2_byte	digest[SHA256_DIGEST_LENGTH] = {0}, *d = digest;
 	int		i = 0;
 
@@ -1228,7 +1228,7 @@ static void sha512_Last(SHA512_CTX* context) {
 	sha512_Transform(context->state, context->buffer, context->state);
 }
 
-void sha512_Final(SHA512_CTX* context, sha2_byte digest[]) {
+void sha512_Final(SHA512_CTX* context, sha2_byte digest[SHA512_DIGEST_LENGTH]) {
 	/* If no digest buffer is passed, we don't bother doing this: */
 	if (digest != (sha2_byte*)0) {
 		sha512_Last(context);
@@ -1247,7 +1247,7 @@ void sha512_Final(SHA512_CTX* context, sha2_byte digest[]) {
 	memzero(context, sizeof(SHA512_CTX));
 }
 
-char *sha512_End(SHA512_CTX* context, char buffer[]) {
+char *sha512_End(SHA512_CTX* context, char buffer[SHA512_DIGEST_STRING_LENGTH]) {
 	sha2_byte	digest[SHA512_DIGEST_LENGTH] = {0}, *d = digest;
 	int		i = 0;