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authorEric Biggers <ebiggers@google.com>2018-01-03 11:16:25 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-02-17 13:21:15 +0100
commitb93728341fb72fe0cf7ab24ada232ce0273e92db (patch)
treee965eae1908d3a732dc9f5de4b59acc5b80fe89f /crypto
parent45f31106baa3fb77f5bdebca824bbc2956c51b7b (diff)
crypto: poly1305 - remove ->setkey() method
commit a16e772e664b9a261424107784804cffc8894977 upstream. Since Poly1305 requires a nonce per invocation, the Linux kernel implementations of Poly1305 don't use the crypto API's keying mechanism and instead expect the key and nonce as the first 32 bytes of the data. But ->setkey() is still defined as a stub returning an error code. This prevents Poly1305 from being used through AF_ALG and will also break it completely once we start enforcing that all crypto API users (not just AF_ALG) call ->setkey() if present. Fix it by removing crypto_poly1305_setkey(), leaving ->setkey as NULL. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/poly1305_generic.c17
1 files changed, 5 insertions, 12 deletions
diff --git a/crypto/poly1305_generic.c b/crypto/poly1305_generic.c
index 2df9835dfbc0..bca99238948f 100644
--- a/crypto/poly1305_generic.c
+++ b/crypto/poly1305_generic.c
@@ -51,17 +51,6 @@ int crypto_poly1305_init(struct shash_desc *desc)
}
EXPORT_SYMBOL_GPL(crypto_poly1305_init);
-int crypto_poly1305_setkey(struct crypto_shash *tfm,
- const u8 *key, unsigned int keylen)
-{
- /* Poly1305 requires a unique key for each tag, which implies that
- * we can't set it on the tfm that gets accessed by multiple users
- * simultaneously. Instead we expect the key as the first 32 bytes in
- * the update() call. */
- return -ENOTSUPP;
-}
-EXPORT_SYMBOL_GPL(crypto_poly1305_setkey);
-
static void poly1305_setrkey(struct poly1305_desc_ctx *dctx, const u8 *key)
{
/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
@@ -80,6 +69,11 @@ static void poly1305_setskey(struct poly1305_desc_ctx *dctx, const u8 *key)
dctx->s[3] = le32_to_cpuvp(key + 12);
}
+/*
+ * Poly1305 requires a unique key for each tag, which implies that we can't set
+ * it on the tfm that gets accessed by multiple users simultaneously. Instead we
+ * expect the key as the first 32 bytes in the update() call.
+ */
unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
const u8 *src, unsigned int srclen)
{
@@ -285,7 +279,6 @@ static struct shash_alg poly1305_alg = {
.init = crypto_poly1305_init,
.update = crypto_poly1305_update,
.final = crypto_poly1305_final,
- .setkey = crypto_poly1305_setkey,
.descsize = sizeof(struct poly1305_desc_ctx),
.base = {
.cra_name = "poly1305",