cast6_generic.c (75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37) cast6_generic.c (9c1e8836edbbaf3656bc07437b59c04be034ac4e)
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Kernel cryptographic api.
3 * cast6.c - Cast6 cipher algorithm [rfc2612].
4 *
5 * CAST-256 (*cast6*) is a DES like Substitution-Permutation Network (SPN)
6 * cryptosystem built upon the CAST-128 (*cast5*) [rfc2144] encryption
7 * algorithm.
8 *

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149int cast6_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
150{
151 return __cast6_setkey(crypto_tfm_ctx(tfm), key, keylen,
152 &tfm->crt_flags);
153}
154EXPORT_SYMBOL_GPL(cast6_setkey);
155
156/*forward quad round*/
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Kernel cryptographic api.
3 * cast6.c - Cast6 cipher algorithm [rfc2612].
4 *
5 * CAST-256 (*cast6*) is a DES like Substitution-Permutation Network (SPN)
6 * cryptosystem built upon the CAST-128 (*cast5*) [rfc2144] encryption
7 * algorithm.
8 *

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149int cast6_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
150{
151 return __cast6_setkey(crypto_tfm_ctx(tfm), key, keylen,
152 &tfm->crt_flags);
153}
154EXPORT_SYMBOL_GPL(cast6_setkey);
155
156/*forward quad round*/
157static inline void Q(u32 *block, u8 *Kr, u32 *Km)
157static inline void Q(u32 *block, const u8 *Kr, const u32 *Km)
158{
159 u32 I;
160 block[2] ^= F1(block[3], Kr[0], Km[0]);
161 block[1] ^= F2(block[2], Kr[1], Km[1]);
162 block[0] ^= F3(block[1], Kr[2], Km[2]);
163 block[3] ^= F1(block[0], Kr[3], Km[3]);
164}
165
166/*reverse quad round*/
158{
159 u32 I;
160 block[2] ^= F1(block[3], Kr[0], Km[0]);
161 block[1] ^= F2(block[2], Kr[1], Km[1]);
162 block[0] ^= F3(block[1], Kr[2], Km[2]);
163 block[3] ^= F1(block[0], Kr[3], Km[3]);
164}
165
166/*reverse quad round*/
167static inline void QBAR(u32 *block, u8 *Kr, u32 *Km)
167static inline void QBAR(u32 *block, const u8 *Kr, const u32 *Km)
168{
169 u32 I;
170 block[3] ^= F1(block[0], Kr[3], Km[3]);
171 block[0] ^= F3(block[1], Kr[2], Km[2]);
172 block[1] ^= F2(block[2], Kr[1], Km[1]);
173 block[2] ^= F1(block[3], Kr[0], Km[0]);
174}
175
168{
169 u32 I;
170 block[3] ^= F1(block[0], Kr[3], Km[3]);
171 block[0] ^= F3(block[1], Kr[2], Km[2]);
172 block[1] ^= F2(block[2], Kr[1], Km[1]);
173 block[2] ^= F1(block[3], Kr[0], Km[0]);
174}
175
176void __cast6_encrypt(struct cast6_ctx *c, u8 *outbuf, const u8 *inbuf)
176void __cast6_encrypt(const void *ctx, u8 *outbuf, const u8 *inbuf)
177{
177{
178 const struct cast6_ctx *c = ctx;
178 const __be32 *src = (const __be32 *)inbuf;
179 __be32 *dst = (__be32 *)outbuf;
180 u32 block[4];
179 const __be32 *src = (const __be32 *)inbuf;
180 __be32 *dst = (__be32 *)outbuf;
181 u32 block[4];
181 u32 *Km;
182 u8 *Kr;
182 const u32 *Km;
183 const u8 *Kr;
183
184 block[0] = be32_to_cpu(src[0]);
185 block[1] = be32_to_cpu(src[1]);
186 block[2] = be32_to_cpu(src[2]);
187 block[3] = be32_to_cpu(src[3]);
188
189 Km = c->Km[0]; Kr = c->Kr[0]; Q(block, Kr, Km);
190 Km = c->Km[1]; Kr = c->Kr[1]; Q(block, Kr, Km);

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206}
207EXPORT_SYMBOL_GPL(__cast6_encrypt);
208
209static void cast6_encrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf)
210{
211 __cast6_encrypt(crypto_tfm_ctx(tfm), outbuf, inbuf);
212}
213
184
185 block[0] = be32_to_cpu(src[0]);
186 block[1] = be32_to_cpu(src[1]);
187 block[2] = be32_to_cpu(src[2]);
188 block[3] = be32_to_cpu(src[3]);
189
190 Km = c->Km[0]; Kr = c->Kr[0]; Q(block, Kr, Km);
191 Km = c->Km[1]; Kr = c->Kr[1]; Q(block, Kr, Km);

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207}
208EXPORT_SYMBOL_GPL(__cast6_encrypt);
209
210static void cast6_encrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf)
211{
212 __cast6_encrypt(crypto_tfm_ctx(tfm), outbuf, inbuf);
213}
214
214void __cast6_decrypt(struct cast6_ctx *c, u8 *outbuf, const u8 *inbuf)
215void __cast6_decrypt(const void *ctx, u8 *outbuf, const u8 *inbuf)
215{
216{
217 const struct cast6_ctx *c = ctx;
216 const __be32 *src = (const __be32 *)inbuf;
217 __be32 *dst = (__be32 *)outbuf;
218 u32 block[4];
218 const __be32 *src = (const __be32 *)inbuf;
219 __be32 *dst = (__be32 *)outbuf;
220 u32 block[4];
219 u32 *Km;
220 u8 *Kr;
221 const u32 *Km;
222 const u8 *Kr;
221
222 block[0] = be32_to_cpu(src[0]);
223 block[1] = be32_to_cpu(src[1]);
224 block[2] = be32_to_cpu(src[2]);
225 block[3] = be32_to_cpu(src[3]);
226
227 Km = c->Km[11]; Kr = c->Kr[11]; Q(block, Kr, Km);
228 Km = c->Km[10]; Kr = c->Kr[10]; Q(block, Kr, Km);

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224 block[0] = be32_to_cpu(src[0]);
225 block[1] = be32_to_cpu(src[1]);
226 block[2] = be32_to_cpu(src[2]);
227 block[3] = be32_to_cpu(src[3]);
228
229 Km = c->Km[11]; Kr = c->Kr[11]; Q(block, Kr, Km);
230 Km = c->Km[10]; Kr = c->Kr[10]; Q(block, Kr, Km);

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