[CRYPTO] api: Add crypto_comp and crypto_has_*

This patch adds the crypto_comp type to complete the compile-time checking
conversion.  The functions crypto_has_alg and crypto_has_cipher, etc. are
also added to replace crypto_alg_available.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 98 insertions, 6 deletions

diff --git a/crypto/api.c b/crypto/api.c
index edaa843d8e83..2e84d4b54790 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -482,3 +482,17 @@ int crypto_alg_available(const char *name, u32 flags)
 EXPORT_SYMBOL_GPL(crypto_alloc_tfm);
 EXPORT_SYMBOL_GPL(crypto_free_tfm);
 EXPORT_SYMBOL_GPL(crypto_alg_available);
+
+int crypto_has_alg(const char *name, u32 type, u32 mask)
+{
+        int ret = 0;
+        struct crypto_alg *alg = crypto_alg_mod_lookup(name, type, mask);
+        
+        if (!IS_ERR(alg)) {
+                crypto_mod_put(alg);
+                ret = 1;
+        }
+        
+        return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_has_alg);
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 929fb9ad1314..cf91c4c0638b 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -236,11 +236,17 @@ int crypto_unregister_alg(struct crypto_alg *alg);
  */
 #ifdef CONFIG_CRYPTO
 int crypto_alg_available(const char *name, u32 flags);
+int crypto_has_alg(const char *name, u32 type, u32 mask);
 #else
 static inline int crypto_alg_available(const char *name, u32 flags)
 {
         return 0;
 }
+
+static inline int crypto_has_alg(const char *name, u32 type, u32 mask)
+{
+        return 0;
+}
 #endif
 
 /*
@@ -329,6 +335,7 @@ struct crypto_tfm {
 };
 
 #define crypto_cipher crypto_tfm
+#define crypto_comp crypto_tfm
 
 struct crypto_blkcipher {
         struct crypto_tfm base;
@@ -485,6 +492,15 @@ static inline void crypto_free_blkcipher(struct crypto_blkcipher *tfm)
         crypto_free_tfm(crypto_blkcipher_tfm(tfm));
 }
 
+static inline int crypto_has_blkcipher(const char *alg_name, u32 type, u32 mask)
+{
+        type &= ~CRYPTO_ALG_TYPE_MASK;
+        type |= CRYPTO_ALG_TYPE_BLKCIPHER;
+        mask |= CRYPTO_ALG_TYPE_MASK;
+
+        return crypto_has_alg(alg_name, type, mask);
+}
+
 static inline const char *crypto_blkcipher_name(struct crypto_blkcipher *tfm)
 {
         return crypto_tfm_alg_name(crypto_blkcipher_tfm(tfm));
@@ -620,6 +636,15 @@ static inline void crypto_free_cipher(struct crypto_cipher *tfm)
         crypto_free_tfm(crypto_cipher_tfm(tfm));
 }
 
+static inline int crypto_has_cipher(const char *alg_name, u32 type, u32 mask)
+{
+        type &= ~CRYPTO_ALG_TYPE_MASK;
+        type |= CRYPTO_ALG_TYPE_CIPHER;
+        mask |= CRYPTO_ALG_TYPE_MASK;
+
+        return crypto_has_alg(alg_name, type, mask);
+}
+
 static inline struct cipher_tfm *crypto_cipher_crt(struct crypto_cipher *tfm)
 {
         return &crypto_cipher_tfm(tfm)->crt_cipher;
@@ -718,6 +743,15 @@ static inline void crypto_free_hash(struct crypto_hash *tfm)
         crypto_free_tfm(crypto_hash_tfm(tfm));
 }
 
+static inline int crypto_has_hash(const char *alg_name, u32 type, u32 mask)
+{
+        type &= ~CRYPTO_ALG_TYPE_MASK;
+        type |= CRYPTO_ALG_TYPE_HASH;
+        mask |= CRYPTO_ALG_TYPE_HASH_MASK;
+
+        return crypto_has_alg(alg_name, type, mask);
+}
+
 static inline struct hash_tfm *crypto_hash_crt(struct crypto_hash *tfm)
 {
         return &crypto_hash_tfm(tfm)->crt_hash;
@@ -853,20 +887,64 @@ static inline void crypto_cipher_get_iv(struct crypto_tfm *tfm,
         memcpy(dst, tfm->crt_cipher.cit_iv, len);
 }
 
-static inline int crypto_comp_compress(struct crypto_tfm *tfm,
+static inline struct crypto_comp *__crypto_comp_cast(struct crypto_tfm *tfm)
+{
+        return (struct crypto_comp *)tfm;
+}
+
+static inline struct crypto_comp *crypto_comp_cast(struct crypto_tfm *tfm)
+{
+        BUG_ON((crypto_tfm_alg_type(tfm) ^ CRYPTO_ALG_TYPE_COMPRESS) &
+               CRYPTO_ALG_TYPE_MASK);
+        return __crypto_comp_cast(tfm);
+}
+
+static inline struct crypto_comp *crypto_alloc_comp(const char *alg_name,
+                                                    u32 type, u32 mask)
+{
+        type &= ~CRYPTO_ALG_TYPE_MASK;
+        type |= CRYPTO_ALG_TYPE_COMPRESS;
+        mask |= CRYPTO_ALG_TYPE_MASK;
+
+        return __crypto_comp_cast(crypto_alloc_base(alg_name, type, mask));
+}
+
+static inline struct crypto_tfm *crypto_comp_tfm(struct crypto_comp *tfm)
+{
+        return tfm;
+}
+
+static inline void crypto_free_comp(struct crypto_comp *tfm)
+{
+        crypto_free_tfm(crypto_comp_tfm(tfm));
+}
+
+static inline int crypto_has_comp(const char *alg_name, u32 type, u32 mask)
+{
+        type &= ~CRYPTO_ALG_TYPE_MASK;
+        type |= CRYPTO_ALG_TYPE_COMPRESS;
+        mask |= CRYPTO_ALG_TYPE_MASK;
+
+        return crypto_has_alg(alg_name, type, mask);
+}
+
+static inline struct compress_tfm *crypto_comp_crt(struct crypto_comp *tfm)
+{
+        return &crypto_comp_tfm(tfm)->crt_compress;
+}
+
+static inline int crypto_comp_compress(struct crypto_comp *tfm,
                                        const u8 *src, unsigned int slen,
                                        u8 *dst, unsigned int *dlen)
 {
-        BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
-        return tfm->crt_compress.cot_compress(tfm, src, slen, dst, dlen);
+        return crypto_comp_crt(tfm)->cot_compress(tfm, src, slen, dst, dlen);
 }
 
-static inline int crypto_comp_decompress(struct crypto_tfm *tfm,
+static inline int crypto_comp_decompress(struct crypto_comp *tfm,
                                          const u8 *src, unsigned int slen,
                                          u8 *dst, unsigned int *dlen)
 {
-        BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
-        return tfm->crt_compress.cot_decompress(tfm, src, slen, dst, dlen);
+        return crypto_comp_crt(tfm)->cot_decompress(tfm, src, slen, dst, dlen);
 }
 
 #endif  /* _LINUX_CRYPTO_H */