diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/cast/c_cfb64.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/cast/c_cfb64.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/cast/c_cfb64.c b/openssl-1.1.0h/crypto/cast/c_cfb64.c new file mode 100644 index 0000000..bd7cb2f --- /dev/null +++ b/openssl-1.1.0h/crypto/cast/c_cfb64.c @@ -0,0 +1,74 @@ +/* + * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include <openssl/cast.h> +#include "cast_lcl.h" + +/* + * The input and output encrypted as though 64bit cfb mode is being used. + * The extra state information to record how much of the 64bit block we have + * used is contained in *num; + */ + +void CAST_cfb64_encrypt(const unsigned char *in, unsigned char *out, + long length, const CAST_KEY *schedule, + unsigned char *ivec, int *num, int enc) +{ + register CAST_LONG v0, v1, t; + register int n = *num; + register long l = length; + CAST_LONG ti[2]; + unsigned char *iv, c, cc; + + iv = ivec; + if (enc) { + while (l--) { + if (n == 0) { + n2l(iv, v0); + ti[0] = v0; + n2l(iv, v1); + ti[1] = v1; + CAST_encrypt((CAST_LONG *)ti, schedule); + iv = ivec; + t = ti[0]; + l2n(t, iv); + t = ti[1]; + l2n(t, iv); + iv = ivec; + } + c = *(in++) ^ iv[n]; + *(out++) = c; + iv[n] = c; + n = (n + 1) & 0x07; + } + } else { + while (l--) { + if (n == 0) { + n2l(iv, v0); + ti[0] = v0; + n2l(iv, v1); + ti[1] = v1; + CAST_encrypt((CAST_LONG *)ti, schedule); + iv = ivec; + t = ti[0]; + l2n(t, iv); + t = ti[1]; + l2n(t, iv); + iv = ivec; + } + cc = *(in++); + c = iv[n]; + iv[n] = cc; + *(out++) = c ^ cc; + n = (n + 1) & 0x07; + } + } + v0 = v1 = ti[0] = ti[1] = t = c = cc = 0; + *num = n; +} |