From 6ee41e5420d0afa8cddf09aa7384dabe570f8dc7 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Thu, 15 Aug 2019 12:00:43 +0300 Subject: [PATCH] crypto: des/3des_ede - add new helpers to verify keys The recently added helper routine to perform key strength validation of triple DES keys is slightly inadequate, since it comes in two versions, neither of which are highly useful for anything other than skciphers (and many drivers still use the older blkcipher interfaces). So let's add a new helper and, considering that this is a helper function that is only intended to be used by crypto code itself, put it in a new des.h header under crypto/internal. While at it, implement a similar helper for single DES, so that we can start replacing the pattern of calling des_ekey() into a temp buffer that occurs in many drivers in drivers/crypto. Signed-off-by: Ard Biesheuvel Signed-off-by: Herbert Xu --- crypto/des_generic.c | 13 ---- include/crypto/internal/des.h | 141 ++++++++++++++++++++++++++++++++++ 2 files changed, 141 insertions(+), 13 deletions(-) create mode 100644 include/crypto/internal/des.h diff --git a/crypto/des_generic.c b/crypto/des_generic.c index dc085514408a..c4d8ecda4ddf 100644 --- a/crypto/des_generic.c +++ b/crypto/des_generic.c @@ -841,19 +841,6 @@ static void des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) d[1] = cpu_to_le32(L); } -/* - * RFC2451: - * - * For DES-EDE3, there is no known need to reject weak or - * complementation keys. Any weakness is obviated by the use of - * multiple keys. - * - * However, if the first two or last two independent 64-bit keys are - * equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the - * same as DES. Implementers MUST reject keys that exhibit this - * property. - * - */ int __des3_ede_setkey(u32 *expkey, u32 *flags, const u8 *key, unsigned int keylen) { diff --git a/include/crypto/internal/des.h b/include/crypto/internal/des.h new file mode 100644 index 000000000000..f5d2e696522e --- /dev/null +++ b/include/crypto/internal/des.h @@ -0,0 +1,141 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * DES & Triple DES EDE key verification helpers + */ + +#ifndef __CRYPTO_INTERNAL_DES_H +#define __CRYPTO_INTERNAL_DES_H + +#include +#include +#include +#include +#include + +/** + * crypto_des_verify_key - Check whether a DES key is weak + * @tfm: the crypto algo + * @key: the key buffer + * + * Returns -EINVAL if the key is weak and the crypto TFM does not permit weak + * keys. Otherwise, 0 is returned. + * + * It is the job of the caller to ensure that the size of the key equals + * DES_KEY_SIZE. + */ +static inline int crypto_des_verify_key(struct crypto_tfm *tfm, const u8 *key) +{ + u32 tmp[DES_EXPKEY_WORDS]; + int err = 0; + + if (!(crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) + return 0; + + if (!des_ekey(tmp, key)) { + crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY); + err = -EINVAL; + } + + memzero_explicit(tmp, sizeof(tmp)); + return err; +} + +/* + * RFC2451: + * + * For DES-EDE3, there is no known need to reject weak or + * complementation keys. Any weakness is obviated by the use of + * multiple keys. + * + * However, if the first two or last two independent 64-bit keys are + * equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the + * same as DES. Implementers MUST reject keys that exhibit this + * property. + * + */ + +/** + * crypto_des3_ede_verify_key - Check whether a DES3-EDE key is weak + * @tfm: the crypto algo + * @key: the key buffer + * + * Returns -EINVAL if the key is weak and the crypto TFM does not permit weak + * keys or when running in FIPS mode. Otherwise, 0 is returned. Note that some + * keys are rejected in FIPS mode even if weak keys are permitted by the TFM + * flags. + * + * It is the job of the caller to ensure that the size of the key equals + * DES3_EDE_KEY_SIZE. + */ +static inline int crypto_des3_ede_verify_key(struct crypto_tfm *tfm, + const u8 *key) +{ + int err = -EINVAL; + u32 K[6]; + + memcpy(K, key, DES3_EDE_KEY_SIZE); + + if ((!((K[0] ^ K[2]) | (K[1] ^ K[3])) || + !((K[2] ^ K[4]) | (K[3] ^ K[5]))) && + (fips_enabled || (crypto_tfm_get_flags(tfm) & + CRYPTO_TFM_REQ_FORBID_WEAK_KEYS))) + goto bad; + + if ((!((K[0] ^ K[4]) | (K[1] ^ K[5]))) && fips_enabled) + goto bad; + + err = 0; +out: + memzero_explicit(K, DES3_EDE_KEY_SIZE); + return err; + +bad: + crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY); + goto out; +} + +static inline int verify_skcipher_des_key(struct crypto_skcipher *tfm, + const u8 *key) +{ + return crypto_des_verify_key(crypto_skcipher_tfm(tfm), key); +} + +static inline int verify_skcipher_des3_key(struct crypto_skcipher *tfm, + const u8 *key) +{ + return crypto_des3_ede_verify_key(crypto_skcipher_tfm(tfm), key); +} + +static inline int verify_ablkcipher_des_key(struct crypto_ablkcipher *tfm, + const u8 *key) +{ + return crypto_des_verify_key(crypto_ablkcipher_tfm(tfm), key); +} + +static inline int verify_ablkcipher_des3_key(struct crypto_ablkcipher *tfm, + const u8 *key) +{ + return crypto_des3_ede_verify_key(crypto_ablkcipher_tfm(tfm), key); +} + +static inline int verify_aead_des_key(struct crypto_aead *tfm, const u8 *key, + int keylen) +{ + if (keylen != DES_KEY_SIZE) { + crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } + return crypto_des_verify_key(crypto_aead_tfm(tfm), key); +} + +static inline int verify_aead_des3_key(struct crypto_aead *tfm, const u8 *key, + int keylen) +{ + if (keylen != DES3_EDE_KEY_SIZE) { + crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } + return crypto_des3_ede_verify_key(crypto_aead_tfm(tfm), key); +} + +#endif /* __CRYPTO_INTERNAL_DES_H */