crypto/modes/cts128.c

4  * Rights for redistribution and usage in source and binary
26  * blocks. CTS is being discussed even in ECB context, but it's not
32 size_t CRYPTO_cts128_encrypt_block(const unsigned char *in,
39     assert(in && out && key && ivec);
49     CRYPTO_cbc128_encrypt(in, out, len, key, ivec, block);
51     in += len;
55         ivec[n] ^= in[n];
63 size_t CRYPTO_nistcts128_encrypt_block(const unsigned char *in,
71     assert(in && out && key && ivec);
80     CRYPTO_cbc128_encrypt(in, out, len, key, ivec, block);
85     in += len;
89         ivec[n] ^= in[n];
96 size_t CRYPTO_cts128_encrypt(const unsigned char *in, unsigned char *out,
106     assert(in && out && key && ivec);
116     (*cbc) (in, out, len, key, ivec, 1);
118     in += len;
123     (*cbc) (in, out - 16, residue, key, ivec, 1);
127     memcpy(tmp.c, in, residue);
134 size_t CRYPTO_nistcts128_encrypt(const unsigned char *in, unsigned char *out,
144     assert(in && out && key && ivec);
153     (*cbc) (in, out, len, key, ivec, 1);
158     in += len;
162     (*cbc) (in, out - 16 + residue, residue, key, ivec, 1);
165     memcpy(tmp.c, in, residue);
171 size_t CRYPTO_cts128_decrypt_block(const unsigned char *in,
182     assert(in && out && key && ivec);
193         CRYPTO_cbc128_decrypt(in, out, len, key, ivec, block);
194         in += len;
198     (*block) (in, tmp.c + 16, key);
201     memcpy(tmp.c, in + 16, residue);
205         unsigned char c = in[n];
210         out[n] = tmp.c[n] ^ in[n];
215 size_t CRYPTO_nistcts128_decrypt_block(const unsigned char *in,
227     assert(in && out && key && ivec);
235         CRYPTO_cbc128_decrypt(in, out, len, key, ivec, block);
242         CRYPTO_cbc128_decrypt(in, out, len, key, ivec, block);
243         in += len;
247     (*block) (in + residue, tmp.c + 16, key);
250     memcpy(tmp.c, in, residue);
254         unsigned char c = in[n];
256         ivec[n] = in[n + residue];
265 size_t CRYPTO_cts128_decrypt(const unsigned char *in, unsigned char *out,
275     assert(in && out && key && ivec);
286         (*cbc) (in, out, len, key, ivec, 0);
287         in += len;
293      * this places in[16] at &tmp.c[16] and decrypted block at &tmp.c[0]
295     (*cbc) (in, tmp.c, 16, key, tmp.c + 16, 0);
297     memcpy(tmp.c, in + 16, residue);
307 size_t CRYPTO_nistcts128_decrypt(const unsigned char *in, unsigned char *out,
317     assert(in && out && key && ivec);
325         (*cbc) (in, out, len, key, ivec, 0);
332         (*cbc) (in, out, len, key, ivec, 0);
333         in += len;
339      * this places in[16] at &tmp.c[16] and decrypted block at &tmp.c[0]
341     (*cbc) (in + residue, tmp.c, 16, key, tmp.c + 16, 0);
343     memcpy(tmp.c, in, residue);