des_generic.c (16d004a2eda7be2c6a2de63eca2ad3c6b57307b3) des_generic.c (c3041f9c93e31159f4e321abea7c1549d271e6a7)
1/*
2 * Cryptographic API.
3 *
4 * DES & Triple DES EDE Cipher Algorithms.
5 *
6 * Copyright (c) 2005 Dag Arne Osvik <da@osvik.no>
7 *
8 * This program is free software; you can redistribute it and/or modify

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623 *
624 * FIPS 74:
625 *
626 * Keys having duals are keys which produce all zeros, all ones, or
627 * alternating zero-one patterns in the C and D registers after Permuted
628 * Choice 1 has operated on the key.
629 *
630 */
1/*
2 * Cryptographic API.
3 *
4 * DES & Triple DES EDE Cipher Algorithms.
5 *
6 * Copyright (c) 2005 Dag Arne Osvik <da@osvik.no>
7 *
8 * This program is free software; you can redistribute it and/or modify

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623 *
624 * FIPS 74:
625 *
626 * Keys having duals are keys which produce all zeros, all ones, or
627 * alternating zero-one patterns in the C and D registers after Permuted
628 * Choice 1 has operated on the key.
629 *
630 */
631static unsigned long ekey(u32 *pe, const u8 *k)
631unsigned long des_ekey(u32 *pe, const u8 *k)
632{
633 /* K&R: long is at least 32 bits */
634 unsigned long a, b, c, d, w;
635 const u32 *pt = pc2;
636
637 d = k[4]; d &= 0x0e; d <<= 4; d |= k[0] & 0x1e; d = pc1[d];
638 c = k[5]; c &= 0x0e; c <<= 4; c |= k[1] & 0x1e; c = pc1[c];
639 b = k[6]; b &= 0x0e; b <<= 4; b |= k[2] & 0x1e; b = pc1[b];

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698 ROL(b, 18);
699 pe[2 * d] = a;
700 pe[2 * d + 1] = b;
701 }
702
703 /* Zero if weak key */
704 return w;
705}
632{
633 /* K&R: long is at least 32 bits */
634 unsigned long a, b, c, d, w;
635 const u32 *pt = pc2;
636
637 d = k[4]; d &= 0x0e; d <<= 4; d |= k[0] & 0x1e; d = pc1[d];
638 c = k[5]; c &= 0x0e; c <<= 4; c |= k[1] & 0x1e; c = pc1[c];
639 b = k[6]; b &= 0x0e; b <<= 4; b |= k[2] & 0x1e; b = pc1[b];

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698 ROL(b, 18);
699 pe[2 * d] = a;
700 pe[2 * d + 1] = b;
701 }
702
703 /* Zero if weak key */
704 return w;
705}
706EXPORT_SYMBOL_GPL(des_ekey);
706
707/*
708 * Decryption key expansion
709 *
710 * No weak key checking is performed, as this is only used by triple DES
711 *
712 */
713static void dkey(u32 *pe, const u8 *k)

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781 unsigned int keylen)
782{
783 struct des_ctx *dctx = crypto_tfm_ctx(tfm);
784 u32 *flags = &tfm->crt_flags;
785 u32 tmp[DES_EXPKEY_WORDS];
786 int ret;
787
788 /* Expand to tmp */
707
708/*
709 * Decryption key expansion
710 *
711 * No weak key checking is performed, as this is only used by triple DES
712 *
713 */
714static void dkey(u32 *pe, const u8 *k)

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782 unsigned int keylen)
783{
784 struct des_ctx *dctx = crypto_tfm_ctx(tfm);
785 u32 *flags = &tfm->crt_flags;
786 u32 tmp[DES_EXPKEY_WORDS];
787 int ret;
788
789 /* Expand to tmp */
789 ret = ekey(tmp, key);
790 ret = des_ekey(tmp, key);
790
791 if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
792 *flags |= CRYPTO_TFM_RES_WEAK_KEY;
793 return -EINVAL;
794 }
795
796 /* Copy to output */
797 memcpy(dctx->expkey, tmp, sizeof(dctx->expkey));

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868
869 if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
870 !((K[2] ^ K[4]) | (K[3] ^ K[5]))))
871 {
872 *flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
873 return -EINVAL;
874 }
875
791
792 if (unlikely(ret == 0) && (*flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
793 *flags |= CRYPTO_TFM_RES_WEAK_KEY;
794 return -EINVAL;
795 }
796
797 /* Copy to output */
798 memcpy(dctx->expkey, tmp, sizeof(dctx->expkey));

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869
870 if (unlikely(!((K[0] ^ K[2]) | (K[1] ^ K[3])) ||
871 !((K[2] ^ K[4]) | (K[3] ^ K[5]))))
872 {
873 *flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
874 return -EINVAL;
875 }
876
876 ekey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
877 des_ekey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
877 dkey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
878 dkey(expkey, key); expkey += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
878 ekey(expkey, key);
879 des_ekey(expkey, key);
879
880 return 0;
881}
882
883static void des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
884{
885 struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
886 const u32 *K = dctx->expkey;

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881 return 0;
882}
883
884static void des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
885{
886 struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
887 const u32 *K = dctx->expkey;

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