[CRYPTO]: Add Deflate algorithm to crypto API.

crypto/Kconfig

@@ -131,6 +131,16 @@ config CRYPTO_AES
 
 	  See http://csrc.nist.gov/encryption/aes/ for more information.
 
+config CRYPTO_DEFLATE
+	tristate "Deflate compression algorithm"
+	depends on CRYPTO
+	default y if INET_IPCOMP=y || INET_IPCOMP=m
+	help
+	  This is the Deflate algorithm (RFC1951), specified for use in
+	  IPSec with the IPCOMP protocol (RFC3173, RFC2394).
+	  
+	  You will most probably want this if using IPSec.
+
 config CRYPTO_TEST
 	tristate "Testing module"
 	depends on CRYPTO

crypto/Makefile

@@ -20,5 +20,6 @@ obj-$(CONFIG_CRYPTO_BLOWFISH) += blowfish.o
 obj-$(CONFIG_CRYPTO_TWOFISH) += twofish.o
 obj-$(CONFIG_CRYPTO_SERPENT) += serpent.o
 obj-$(CONFIG_CRYPTO_AES) += aes.o
+obj-$(CONFIG_CRYPTO_DEFLATE) += deflate.o
 
 obj-$(CONFIG_CRYPTO_TEST) += tcrypt.o

crypto/api.c

@@ -127,7 +127,7 @@ struct crypto_tfm *crypto_alloc_tfm(const char *name, u32 flags)
 	if (tfm == NULL)
 		goto out_put;
 
-	memset(tfm, 0, sizeof(*tfm));
+	memset(tfm, 0, sizeof(*tfm) + alg->cra_ctxsize);
 	
 	tfm->__crt_alg = alg;
 	

crypto/compress.c

@@ -18,29 +18,46 @@
 #include <linux/string.h>
 #include "internal.h"
 
-static void crypto_compress(struct crypto_tfm *tfm)
+static int crypto_compress(struct crypto_tfm *tfm,
+                            const u8 *src, unsigned int slen,
+                            u8 *dst, unsigned int *dlen)
 {
-	tfm->__crt_alg->cra_compress.coa_compress();
+	return tfm->__crt_alg->cra_compress.coa_compress(crypto_tfm_ctx(tfm),
+	                                                 src, slen, dst,
+	                                                 dlen);
 }
 
-static void crypto_decompress(struct crypto_tfm *tfm)
+static int crypto_decompress(struct crypto_tfm *tfm,
+                             const u8 *src, unsigned int slen,
+                             u8 *dst, unsigned int *dlen)
 {
-	tfm->__crt_alg->cra_compress.coa_decompress();
+	return tfm->__crt_alg->cra_compress.coa_decompress(crypto_tfm_ctx(tfm),
+	                                                   src, slen, dst,
+	                                                   dlen);
 }
 
 int crypto_init_compress_flags(struct crypto_tfm *tfm, u32 flags)
 {
-	return crypto_cipher_flags(flags) ? -EINVAL : 0;
+	return flags ? -EINVAL : 0;
 }
 
 int crypto_init_compress_ops(struct crypto_tfm *tfm)
 {
+	int ret = 0;
 	struct compress_tfm *ops = &tfm->crt_compress;
 	
+	ret = tfm->__crt_alg->cra_compress.coa_init(crypto_tfm_ctx(tfm));
+	if (ret)
+		goto out;
+
 	ops->cot_compress = crypto_compress;
 	ops->cot_decompress = crypto_decompress;
-	return 0;
+	
+out:
+	return ret;
 }
 
 void crypto_exit_compress_ops(struct crypto_tfm *tfm)
-{ }
+{
+	tfm->__crt_alg->cra_compress.coa_exit(crypto_tfm_ctx(tfm));
+}

crypto/crypto_null.c

@@ -26,11 +26,13 @@
 #define NULL_BLOCK_SIZE		1
 #define NULL_DIGEST_SIZE	0
 
-static void null_compress(void)
-{ }
+static int null_compress(void *ctx, const u8 *src, unsigned int slen,
+                         u8 *dst, unsigned int *dlen)
+{ return 0; }
 
-static void null_decompress(void)
-{ }
+static int null_decompress(void *ctx, const u8 *src, unsigned int slen,
+                           u8 *dst, unsigned int *dlen)
+{ return 0; }
 
 static void null_init(void *ctx)
 { }

crypto/deflate.c

+/* 
+ * Cryptographic API.
+ *
+ * Deflate algorithm (RFC 1951), implemented here primarily for use
+ * by IPCOMP (RFC 3173 & RFC 2394).
+ *
+ * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
+ * 
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.
+ *
+ * FIXME: deflate transforms will require up to a total of about 436k of kernel
+ * memory on i386 (390k for compression, the rest for decompression), as the
+ * current zlib kernel code uses a worst case pre-allocation system by default.
+ * This needs to be fixed so that the amount of memory required is properly
+ * related to the  winbits and memlevel parameters.
+ *
+ * The default winbits of 11 should suit most packets, and it may be something
+ * to configure on a per-tfm basis in the future.
+ *
+ * Currently, compression history is not maintained between tfm calls, as
+ * it is not needed for IPCOMP and keeps the code simpler.  It can be
+ * implemented if someone wants it.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/crypto.h>
+#include <linux/zlib.h>
+#include <linux/vmalloc.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/net.h>
+
+#define DEFLATE_DEF_LEVEL		Z_DEFAULT_COMPRESSION
+#define DEFLATE_DEF_WINBITS		11
+#define DEFLATE_DEF_MEMLEVEL		MAX_MEM_LEVEL
+
+struct deflate_ctx {
+	int comp_initialized;
+	int decomp_initialized;
+	struct z_stream_s comp_stream;
+	struct z_stream_s decomp_stream;
+};
+
+static inline int deflate_gfp(void)
+{
+	return in_softirq() ? GFP_ATOMIC : GFP_KERNEL;
+}
+
+static int deflate_init(void *ctx)
+{
+	return 0;
+}
+
+static void deflate_exit(void *ctx)
+{
+	struct deflate_ctx *dctx = ctx;
+
+	if (dctx->comp_initialized)
+		vfree(dctx->comp_stream.workspace);
+	if (dctx->decomp_initialized)
+		kfree(dctx->decomp_stream.workspace);
+}
+
+/*
+ * Lazy initialization to make interface simple without allocating
+ * un-needed workspaces.  Thus can be called in softirq context.
+ */
+static int deflate_comp_init(struct deflate_ctx *ctx)
+{
+	int ret = 0;
+	struct z_stream_s *stream = &ctx->comp_stream;
+
+	stream->workspace = __vmalloc(zlib_deflate_workspacesize(),
+	                              deflate_gfp()|__GFP_HIGHMEM,
+	                              PAGE_KERNEL);
+	if (!stream->workspace ) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	memset(stream->workspace, 0, sizeof(stream->workspace));
+	ret = zlib_deflateInit2(stream, DEFLATE_DEF_LEVEL, Z_DEFLATED,
+	                        -DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL,
+	                        Z_DEFAULT_STRATEGY);
+	if (ret != Z_OK) {
+		ret = -EINVAL;
+		goto out_free;
+	}
+	ctx->comp_initialized = 1;
+out:	
+	return ret;
+out_free:
+	vfree(stream->workspace);
+	goto out;
+}
+
+static int deflate_decomp_init(struct deflate_ctx *ctx)
+{
+	int ret = 0;
+	struct z_stream_s *stream = &ctx->decomp_stream;
+
+	stream->workspace = kmalloc(zlib_inflate_workspacesize(),
+	                            deflate_gfp());
+	if (!stream->workspace ) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	memset(stream->workspace, 0, sizeof(stream->workspace));
+	ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS);
+	if (ret != Z_OK) {
+		ret = -EINVAL;
+		goto out_free;
+	}
+	ctx->decomp_initialized = 1;
+out:
+	return ret;
+out_free:
+	kfree(stream->workspace);
+	goto out;
+}
+
+static int deflate_compress(void *ctx, const u8 *src, unsigned int slen,
+	                    u8 *dst, unsigned int *dlen)
+{
+	int ret = 0;
+	struct deflate_ctx *dctx = ctx;
+	struct z_stream_s *stream = &dctx->comp_stream;
+
+	if (!dctx->comp_initialized) {
+		ret = deflate_comp_init(dctx);
+		if (ret)
+			goto out;
+	}
+
+	ret = zlib_deflateReset(stream);
+	if (ret != Z_OK) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	stream->next_in = (u8 *)src;
+	stream->avail_in = slen;
+	stream->next_out = (u8 *)dst;
+	stream->avail_out = *dlen;
+
+	ret = zlib_deflate(stream, Z_FINISH);
+	if (ret != Z_STREAM_END) {
+		ret = -EINVAL;
+		goto out;
+	}
+	ret = 0;
+	*dlen = stream->total_out;
+out:
+	return ret;
+}
+ 
+static int deflate_decompress(void *ctx, const u8 *src, unsigned int slen,
+                              u8 *dst, unsigned int *dlen)
+{
+	
+	int ret = 0;
+	struct deflate_ctx *dctx = ctx;
+	struct z_stream_s *stream = &dctx->decomp_stream;
+
+	if (!dctx->decomp_initialized) {
+		ret = deflate_decomp_init(dctx);
+		if (ret)
+			goto out;
+	}
+
+	ret = zlib_inflateReset(stream);
+	if (ret != Z_OK) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	stream->next_in = (u8 *)src;
+	stream->avail_in = slen;
+	stream->next_out = (u8 *)dst;
+	stream->avail_out = *dlen;
+
+	ret = zlib_inflate(stream, Z_FINISH);
+	if (ret != Z_STREAM_END) {
+		ret = -EINVAL;
+		goto out;
+	}
+	ret = 0;
+	*dlen = stream->total_out;
+out:
+	return ret;
+}
+
+static struct crypto_alg alg = {
+	.cra_name		= "deflate",
+	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
+	.cra_ctxsize		= sizeof(struct deflate_ctx),
+	.cra_module		= THIS_MODULE,
+	.cra_list		= LIST_HEAD_INIT(alg.cra_list),
+	.cra_u			= { .compress = {
+	.coa_init		= deflate_init,
+	.coa_exit		= deflate_exit,
+	.coa_compress 		= deflate_compress,
+	.coa_decompress  	= deflate_decompress } }
+};
+
+static int __init init(void)
+{
+	return crypto_register_alg(&alg);
+}
+
+static void __exit fini(void)
+{
+	crypto_unregister_alg(&alg);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Deflate Compression Algorithm for IPCOMP");
+MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
+

crypto/digest.c

@@ -61,7 +61,7 @@ static void digest(struct crypto_tfm *tfm,
 
 int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags)
 {
-	return crypto_cipher_flags(flags) ? -EINVAL : 0;
+	return flags ? -EINVAL : 0;
 }
 
 int crypto_init_digest_ops(struct crypto_tfm *tfm)

crypto/internal.h

@@ -41,11 +41,6 @@ static inline void crypto_yield(struct crypto_tfm *tfm)
 		cond_resched();
 }
 
-static inline u32 crypto_cipher_flags(u32 flags)
-{
-	return flags & (CRYPTO_TFM_MODE_MASK|CRYPTO_TFM_REQ_WEAK_KEY);
-}
-
 static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
 {
 	return (void *)&tfm[1];

crypto/proc.c

@@ -54,10 +54,10 @@ static int c_show(struct seq_file *m, void *p)
 	
 	seq_printf(m, "name         : %s\n", alg->cra_name);
 	seq_printf(m, "module       : %s\n", module_name(alg->cra_module));
-	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 	
 	switch (alg->cra_flags & CRYPTO_ALG_TYPE_MASK) {
 	case CRYPTO_ALG_TYPE_CIPHER:
+		seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 		seq_printf(m, "min keysize  : %u\n",
 					alg->cra_cipher.cia_min_keysize);
 		seq_printf(m, "max keysize  : %u\n",
@@ -67,6 +67,7 @@ static int c_show(struct seq_file *m, void *p)
 		break;
 		
 	case CRYPTO_ALG_TYPE_DIGEST:
+		seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 		seq_printf(m, "digestsize   : %u\n",
 		           alg->cra_digest.dia_digestsize);
 		break;

crypto/tcrypt.c

@@ -48,7 +48,7 @@ static char *tvmem;
 
 static char *check[] = {
 	"des", "md5", "des3_ede", "rot13", "sha1", "sha256", "blowfish",
-	"twofish", "serpent", "sha384", "sha512", "md4", "aes",
+	"twofish", "serpent", "sha384", "sha512", "md4", "aes", "deflate",
 	 NULL
 };
 
@@ -2192,6 +2192,86 @@ test_aes(void)
 	crypto_free_tfm(tfm);
 }
 
+static void
+test_deflate(void)
+{
+	unsigned int i;
+	char result[COMP_BUF_SIZE];
+	struct crypto_tfm *tfm;
+	struct comp_testvec *tv;
+	unsigned int tsize;
+
+	printk("\ntesting deflate compression\n");
+
+	tsize = sizeof (deflate_comp_tv_template);
+	if (tsize > TVMEMSIZE) {
+		printk("template (%u) too big for tvmem (%u)\n", tsize,
+		       TVMEMSIZE);
+		return;
+	}
+
+	memcpy(tvmem, deflate_comp_tv_template, tsize);
+	tv = (void *) tvmem;
+
+	tfm = crypto_alloc_tfm("deflate", 0);
+	if (tfm == NULL) {
+		printk("failed to load transform for deflate\n");
+		return;
+	}
+
+	for (i = 0; i < DEFLATE_COMP_TEST_VECTORS; i++) {
+		int ilen, ret, dlen = COMP_BUF_SIZE;
+		
+		printk("test %u:\n", i + 1);
+		memset(result, 0, sizeof (result));
+
+		ilen = tv[i].inlen;
+		ret = crypto_comp_compress(tfm, tv[i].input,
+		                           ilen, result, &dlen);
+		if (ret) {
+			printk("fail: ret=%d\n", ret);
+			continue;
+		}
+		hexdump(result, dlen);
+		printk("%s (ratio %d:%d)\n",
+		       memcmp(result, tv[i].output, dlen) ? "fail" : "pass",
+		       ilen, dlen);
+	}
+
+	printk("\ntesting deflate decompression\n");
+
+	tsize = sizeof (deflate_decomp_tv_template);
+	if (tsize > TVMEMSIZE) {
+		printk("template (%u) too big for tvmem (%u)\n", tsize,
+		       TVMEMSIZE);
+		goto out;
+	}
+
+	memcpy(tvmem, deflate_decomp_tv_template, tsize);
+	tv = (void *) tvmem;
+
+	for (i = 0; i < DEFLATE_DECOMP_TEST_VECTORS; i++) {
+		int ilen, ret, dlen = COMP_BUF_SIZE;
+		
+		printk("test %u:\n", i + 1);
+		memset(result, 0, sizeof (result));
+
+		ilen = tv[i].inlen;
+		ret = crypto_comp_decompress(tfm, tv[i].input,
+		                             ilen, result, &dlen);
+		if (ret) {
+			printk("fail: ret=%d\n", ret);
+			continue;
+		}
+		hexdump(result, dlen);
+		printk("%s (ratio %d:%d)\n",
+		       memcmp(result, tv[i].output, dlen) ? "fail" : "pass",
+		       ilen, dlen);
+	}
+out:
+	crypto_free_tfm(tfm);
+}
+
 static void
 test_available(void)
 {
@@ -2223,6 +2303,7 @@ do_test(void)
 		test_aes();
 		test_sha384();
 		test_sha512();
+		test_deflate();
 #ifdef CONFIG_CRYPTO_HMAC
 		test_hmac_md5();
 		test_hmac_sha1();
@@ -2278,6 +2359,10 @@ do_test(void)
 		test_sha512();
 		break;
 
+	case 13:
+		test_deflate();
+		break;
+
 #ifdef CONFIG_CRYPTO_HMAC
 	case 100:
 		test_hmac_md5();

crypto/tcrypt.h

@@ -1682,4 +1682,104 @@ struct aes_tv aes_dec_tv_template[] = {
 	},
 };
 
+/*
+ * Compression stuff.
+ */
+#define COMP_BUF_SIZE           512
+
+struct comp_testvec {
+	int inlen, outlen;
+	char input[COMP_BUF_SIZE];
+	char output[COMP_BUF_SIZE];
+};
+
+/*
+ * Deflate test vectors (null-terminated strings).
+ * Params: winbits=11, Z_DEFAULT_COMPRESSION, MAX_MEM_LEVEL.
+ */
+#define DEFLATE_COMP_TEST_VECTORS 2
+#define DEFLATE_DECOMP_TEST_VECTORS 2
+
+struct comp_testvec deflate_comp_tv_template[] = {
+	{
+	  70, 38,
+	  
+	  "Join us now and share the software "
+	  "Join us now and share the software ",
+
+          { 0xf3, 0xca, 0xcf, 0xcc, 0x53, 0x28, 0x2d, 0x56,
+            0xc8, 0xcb, 0x2f, 0x57, 0x48, 0xcc, 0x4b, 0x51,
+            0x28, 0xce, 0x48, 0x2c, 0x4a, 0x55, 0x28, 0xc9,
+            0x48, 0x55, 0x28, 0xce, 0x4f, 0x2b, 0x29, 0x07,
+            0x71, 0xbc, 0x08, 0x2b, 0x01, 0x00 
+          },
+	},
+	  
+	{
+	  191, 122,
+	  
+	  "This document describes a compression method based on the DEFLATE"
+	  "compression algorithm.  This document defines the application of "
+	  "the DEFLATE algorithm to the IP Payload Compression Protocol.",
+	  
+	  { 0x5d, 0x8d, 0x31, 0x0e, 0xc2, 0x30, 0x10, 0x04,
+	    0xbf, 0xb2, 0x2f, 0xc8, 0x1f, 0x10, 0x04, 0x09,
+	    0x89, 0xc2, 0x85, 0x3f, 0x70, 0xb1, 0x2f, 0xf8,
+	    0x24, 0xdb, 0x67, 0xd9, 0x47, 0xc1, 0xef, 0x49,
+	    0x68, 0x12, 0x51, 0xae, 0x76, 0x67, 0xd6, 0x27,
+	    0x19, 0x88, 0x1a, 0xde, 0x85, 0xab, 0x21, 0xf2,
+	    0x08, 0x5d, 0x16, 0x1e, 0x20, 0x04, 0x2d, 0xad,
+	    0xf3, 0x18, 0xa2, 0x15, 0x85, 0x2d, 0x69, 0xc4,
+	    0x42, 0x83, 0x23, 0xb6, 0x6c, 0x89, 0x71, 0x9b,
+	    0xef, 0xcf, 0x8b, 0x9f, 0xcf, 0x33, 0xca, 0x2f,
+	    0xed, 0x62, 0xa9, 0x4c, 0x80, 0xff, 0x13, 0xaf,
+	    0x52, 0x37, 0xed, 0x0e, 0x52, 0x6b, 0x59, 0x02,
+	    0xd9, 0x4e, 0xe8, 0x7a, 0x76, 0x1d, 0x02, 0x98,
+	    0xfe, 0x8a, 0x87, 0x83, 0xa3, 0x4f, 0x56, 0x8a,
+	    0xb8, 0x9e, 0x8e, 0x5c, 0x57, 0xd3, 0xa0, 0x79,
+	    0xfa, 0x02 },
+	},
+};
+
+struct comp_testvec deflate_decomp_tv_template[] = {
+	{
+	  122, 191,
+	  
+	  { 0x5d, 0x8d, 0x31, 0x0e, 0xc2, 0x30, 0x10, 0x04,
+	    0xbf, 0xb2, 0x2f, 0xc8, 0x1f, 0x10, 0x04, 0x09,
+	    0x89, 0xc2, 0x85, 0x3f, 0x70, 0xb1, 0x2f, 0xf8,
+	    0x24, 0xdb, 0x67, 0xd9, 0x47, 0xc1, 0xef, 0x49,
+	    0x68, 0x12, 0x51, 0xae, 0x76, 0x67, 0xd6, 0x27,
+	    0x19, 0x88, 0x1a, 0xde, 0x85, 0xab, 0x21, 0xf2,
+	    0x08, 0x5d, 0x16, 0x1e, 0x20, 0x04, 0x2d, 0xad,
+	    0xf3, 0x18, 0xa2, 0x15, 0x85, 0x2d, 0x69, 0xc4,
+	    0x42, 0x83, 0x23, 0xb6, 0x6c, 0x89, 0x71, 0x9b,
+	    0xef, 0xcf, 0x8b, 0x9f, 0xcf, 0x33, 0xca, 0x2f,
+	    0xed, 0x62, 0xa9, 0x4c, 0x80, 0xff, 0x13, 0xaf,
+	    0x52, 0x37, 0xed, 0x0e, 0x52, 0x6b, 0x59, 0x02,
+	    0xd9, 0x4e, 0xe8, 0x7a, 0x76, 0x1d, 0x02, 0x98,
+	    0xfe, 0x8a, 0x87, 0x83, 0xa3, 0x4f, 0x56, 0x8a,
+	    0xb8, 0x9e, 0x8e, 0x5c, 0x57, 0xd3, 0xa0, 0x79,
+	    0xfa, 0x02 },
+	    
+	    "This document describes a compression method based on the DEFLATE"
+	    "compression algorithm.  This document defines the application of "
+	    "the DEFLATE algorithm to the IP Payload Compression Protocol.",
+	},
+	
+	{
+	  38, 70,
+	  
+          { 0xf3, 0xca, 0xcf, 0xcc, 0x53, 0x28, 0x2d, 0x56,
+            0xc8, 0xcb, 0x2f, 0x57, 0x48, 0xcc, 0x4b, 0x51,
+            0x28, 0xce, 0x48, 0x2c, 0x4a, 0x55, 0x28, 0xc9,
+            0x48, 0x55, 0x28, 0xce, 0x4f, 0x2b, 0x29, 0x07,
+            0x71, 0xbc, 0x08, 0x2b, 0x01, 0x00
+          },
+          
+          "Join us now and share the software "
+	  "Join us now and share the software ",
+	},
+};
+
 #endif	/* _CRYPTO_TCRYPT_H */

include/linux/crypto.h

@@ -31,7 +31,6 @@
 #define CRYPTO_ALG_TYPE_DIGEST		0x00000002
 #define CRYPTO_ALG_TYPE_COMPRESS	0x00000004
 
-
 /*
  * Transform masks and values (for crt_flags).
  */
@@ -45,14 +44,12 @@
 #define CRYPTO_TFM_MODE_CTR		0x00000008
 
 #define CRYPTO_TFM_REQ_WEAK_KEY		0x00000100
-
 #define CRYPTO_TFM_RES_WEAK_KEY		0x00100000
 #define CRYPTO_TFM_RES_BAD_KEY_LEN   	0x00200000
 #define CRYPTO_TFM_RES_BAD_KEY_SCHED 	0x00400000
 #define CRYPTO_TFM_RES_BAD_BLOCK_LEN 	0x00800000
 #define CRYPTO_TFM_RES_BAD_FLAGS 	0x01000000
 
-
 /*
  * Miscellaneous stuff.
  */
@@ -83,8 +80,12 @@ struct digest_alg {
 };
 
 struct compress_alg {
-	void (*coa_compress)(void);
-	void (*coa_decompress)(void);
+	int (*coa_init)(void *ctx);
+	void (*coa_exit)(void *ctx);
+	int (*coa_compress)(void *ctx, const u8 *src, unsigned int slen,
+	                    u8 *dst, unsigned int *dlen);
+	int (*coa_decompress)(void *ctx, const u8 *src, unsigned int slen,
+	                      u8 *dst, unsigned int *dlen);
 };
 
 #define cra_cipher	cra_u.cipher
@@ -162,8 +163,12 @@ struct digest_tfm {
 };
 
 struct compress_tfm {
-	void (*cot_compress)(struct crypto_tfm *tfm);
-	void (*cot_decompress)(struct crypto_tfm *tfm);
+	int (*cot_compress)(struct crypto_tfm *tfm,
+	                    const u8 *src, unsigned int slen,
+	                    u8 *dst, unsigned int *dlen);
+	int (*cot_decompress)(struct crypto_tfm *tfm,
+	                      const u8 *src, unsigned int slen,
+	                      u8 *dst, unsigned int *dlen);
 };
 
 #define crt_cipher	crt_u.cipher
@@ -336,16 +341,20 @@ static inline void crypto_cipher_get_iv(struct crypto_tfm *tfm,
 	memcpy(dst, tfm->crt_cipher.cit_iv, len);
 }
 
-static inline void crypto_comp_compress(struct crypto_tfm *tfm)
+static inline int crypto_comp_compress(struct crypto_tfm *tfm,
+                                       const u8 *src, unsigned int slen,
+                                       u8 *dst, unsigned int *dlen)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
-	tfm->crt_compress.cot_compress(tfm);
+	return tfm->crt_compress.cot_compress(tfm, src, slen, dst, dlen);
 }
 
-static inline void crypto_comp_decompress(struct crypto_tfm *tfm) 
+static inline int crypto_comp_decompress(struct crypto_tfm *tfm,
+                                         const u8 *src, unsigned int slen,
+                                         u8 *dst, unsigned int *dlen)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
-	tfm->crt_compress.cot_decompress(tfm);
+	return tfm->crt_compress.cot_decompress(tfm, src, slen, dst, dlen);
 }
 
 /*

lib/Kconfig

@@ -17,13 +17,14 @@ config CRC32
 #
 config ZLIB_INFLATE
 	tristate
-	default y if CRAMFS=y || PPP_DEFLATE=y || JFFS2_FS=y || ZISOFS_FS=y || BINFMT_ZFLAT=y
-	default m if CRAMFS=m || PPP_DEFLATE=m || JFFS2_FS=m || ZISOFS_FS=m || BINFMT_ZFLAT=m
+	default y if CRAMFS=y || PPP_DEFLATE=y || JFFS2_FS=y || ZISOFS_FS=y || BINFMT_ZFLAT=y || CRYPTO_DEFLATE=y
+	default m if CRAMFS=m || PPP_DEFLATE=m || JFFS2_FS=m || ZISOFS_FS=m || BINFMT_ZFLAT=m || CRYPTO_DEFLATE=m
 
 config ZLIB_DEFLATE
 	tristate
-	default m if PPP_DEFLATE!=y && JFFS2_FS!=y && (PPP_DEFLATE=m || JFFS2_FS=m)
-	default y if PPP_DEFLATE=y || JFFS2_FS=y
+	default m if PPP_DEFLATE!=y && JFFS2_FS!=y && CRYPTO_DEFLATE!=y && \
+		(PPP_DEFLATE=m || JFFS2_FS=m || CRYPTO_DEFLATE=m)
+	default y if PPP_DEFLATE=y || JFFS2_FS=y || CRYPTO_DEFLATE=y
 
 endmenu