diff --git a/crypto/md4.c b/crypto/md4.c
index a2d6df5..c1bc71b 100644
--- a/crypto/md4.c
+++ b/crypto/md4.c
@@ -152,9 +152,9 @@
 	md4_transform(ctx->hash, ctx->block);
 }
 
-static void md4_init(void *ctx)
+static void md4_init(struct crypto_tfm *tfm)
 {
-	struct md4_ctx *mctx = ctx;
+	struct md4_ctx *mctx = crypto_tfm_ctx(tfm);
 
 	mctx->hash[0] = 0x67452301;
 	mctx->hash[1] = 0xefcdab89;
@@ -163,9 +163,9 @@
 	mctx->byte_count = 0;
 }
 
-static void md4_update(void *ctx, const u8 *data, unsigned int len)
+static void md4_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 {
-	struct md4_ctx *mctx = ctx;
+	struct md4_ctx *mctx = crypto_tfm_ctx(tfm);
 	const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 
 	mctx->byte_count += len;
@@ -193,9 +193,9 @@
 	memcpy(mctx->block, data, len);
 }
 
-static void md4_final(void *ctx, u8 *out)
+static void md4_final(struct crypto_tfm *tfm, u8 *out)
 {
-	struct md4_ctx *mctx = ctx;
+	struct md4_ctx *mctx = crypto_tfm_ctx(tfm);
 	const unsigned int offset = mctx->byte_count & 0x3f;
 	char *p = (char *)mctx->block + offset;
 	int padding = 56 - (offset + 1);