64-bit ciphers are old, but it would be good to use common code for their implementations.
Signed-off-by: Dmitry Baryshkov <dbarysh...@gmail.com> --- src/lib/libcrypto/modes/cbc64.c | 202 ++++++++++++++++++++++++++++++++ src/lib/libcrypto/modes/cfb64.c | 169 ++++++++++++++++++++++++++ src/lib/libcrypto/modes/ctr64.c | 174 +++++++++++++++++++++++++++ src/lib/libcrypto/modes/modes.h | 26 ++++ src/lib/libcrypto/modes/ofb64.c | 119 +++++++++++++++++++ 5 files changed, 690 insertions(+) create mode 100644 src/lib/libcrypto/modes/cbc64.c create mode 100644 src/lib/libcrypto/modes/cfb64.c create mode 100644 src/lib/libcrypto/modes/ctr64.c create mode 100644 src/lib/libcrypto/modes/ofb64.c diff --git a/src/lib/libcrypto/modes/cbc64.c b/src/lib/libcrypto/modes/cbc64.c new file mode 100644 index 000000000000..ec65ac5d3468 --- /dev/null +++ b/src/lib/libcrypto/modes/cbc64.c @@ -0,0 +1,202 @@ +/* $OpenBSD: cbc64.c,v 1.4 2015/02/10 09:46:30 miod Exp $ */ +/* ==================================================================== + * Copyright (c) 2008 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-c...@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + */ + +#include <openssl/crypto.h> +#include "modes_lcl.h" +#include <string.h> + +#ifndef MODES_DEBUG +# ifndef NDEBUG +# define NDEBUG +# endif +#endif + +#undef STRICT_ALIGNMENT +#ifdef __STRICT_ALIGNMENT +#define STRICT_ALIGNMENT 1 +#else +#define STRICT_ALIGNMENT 0 +#endif + +void CRYPTO_cbc64_encrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[8], block64_f block) +{ + size_t n; + const unsigned char *iv = ivec; + +#if !defined(OPENSSL_SMALL_FOOTPRINT) + if (STRICT_ALIGNMENT && + ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) { + while (len>=8) { + for(n=0; n<8; ++n) + out[n] = in[n] ^ iv[n]; + (*block)(out, out, key); + iv = out; + len -= 8; + in += 8; + out += 8; + } + } else { + while (len>=8) { + for(n=0; n<8; n+=sizeof(size_t)) + *(size_t*)(out+n) = + *(size_t*)(in+n) ^ *(size_t*)(iv+n); + (*block)(out, out, key); + iv = out; + len -= 8; + in += 8; + out += 8; + } + } +#endif + while (len) { + for(n=0; n<8 && n<len; ++n) + out[n] = in[n] ^ iv[n]; + for(; n<8; ++n) + out[n] = iv[n]; + (*block)(out, out, key); + iv = out; + if (len<=8) break; + len -= 8; + in += 8; + out += 8; + } + memcpy(ivec,iv,8); +} + +void CRYPTO_cbc64_decrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[8], block64_f block) +{ + size_t n; + union { size_t t[8/sizeof(size_t)]; unsigned char c[8]; } tmp; + +#if !defined(OPENSSL_SMALL_FOOTPRINT) + if (in != out) { + const unsigned char *iv = ivec; + + if (STRICT_ALIGNMENT && + ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) { + while (len>=8) { + (*block)(in, out, key); + for(n=0; n<8; ++n) + out[n] ^= iv[n]; + iv = in; + len -= 8; + in += 8; + out += 8; + } + } else if (8%sizeof(size_t) == 0) { /* always true */ + while (len>=8) { + size_t *out_t=(size_t *)out, *iv_t=(size_t *)iv; + + (*block)(in, out, key); + for(n=0; n<8/sizeof(size_t); n++) + out_t[n] ^= iv_t[n]; + iv = in; + len -= 8; + in += 8; + out += 8; + } + } + memcpy(ivec,iv,8); + } else { + if (STRICT_ALIGNMENT && + ((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) { + unsigned char c; + while (len>=8) { + (*block)(in, tmp.c, key); + for(n=0; n<8; ++n) { + c = in[n]; + out[n] = tmp.c[n] ^ ivec[n]; + ivec[n] = c; + } + len -= 8; + in += 8; + out += 8; + } + } else if (8%sizeof(size_t) == 0) { /* always true */ + while (len>=8) { + size_t c, *out_t=(size_t *)out, *ivec_t=(size_t *)ivec; + const size_t *in_t=(const size_t *)in; + + (*block)(in, tmp.c, key); + for(n=0; n<8/sizeof(size_t); n++) { + c = in_t[n]; + out_t[n] = tmp.t[n] ^ ivec_t[n]; + ivec_t[n] = c; + } + len -= 8; + in += 8; + out += 8; + } + } + } +#endif + while (len) { + unsigned char c; + (*block)(in, tmp.c, key); + for(n=0; n<8 && n<len; ++n) { + c = in[n]; + out[n] = tmp.c[n] ^ ivec[n]; + ivec[n] = c; + } + if (len<=8) { + for (; n<8; ++n) + ivec[n] = in[n]; + break; + } + len -= 8; + in += 8; + out += 8; + } +} diff --git a/src/lib/libcrypto/modes/cfb64.c b/src/lib/libcrypto/modes/cfb64.c new file mode 100644 index 000000000000..f335fa39c4ea --- /dev/null +++ b/src/lib/libcrypto/modes/cfb64.c @@ -0,0 +1,169 @@ +/* $OpenBSD: cfb64.c,v 1.4 2015/02/10 09:46:30 miod Exp $ */ +/* ==================================================================== + * Copyright (c) 2008 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-c...@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + */ + +#include <openssl/crypto.h> +#include "modes_lcl.h" +#include <string.h> + +#ifndef MODES_DEBUG +# ifndef NDEBUG +# define NDEBUG +# endif +#endif + +/* 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 CRYPTO_cfb64_encrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[8], int *num, + int enc, block64_f block) +{ + unsigned int n; + size_t l = 0; + + n = *num; + + if (enc) { +#if !defined(OPENSSL_SMALL_FOOTPRINT) + if (8%sizeof(size_t) == 0) do { /* always true actually */ + while (n && len) { + *(out++) = ivec[n] ^= *(in++); + --len; + n = (n+1) % 8; + } +#ifdef __STRICT_ALIGNMENT + if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) + break; +#endif + while (len>=8) { + (*block)(ivec, ivec, key); + for (; n<8; n+=sizeof(size_t)) { + *(size_t*)(out+n) = + *(size_t*)(ivec+n) ^= *(size_t*)(in+n); + } + len -= 8; + out += 8; + in += 8; + n = 0; + } + if (len) { + (*block)(ivec, ivec, key); + while (len--) { + out[n] = ivec[n] ^= in[n]; + ++n; + } + } + *num = n; + return; + } while (0); + /* the rest would be commonly eliminated by x86* compiler */ +#endif + while (l<len) { + if (n == 0) { + (*block)(ivec, ivec, key); + } + out[l] = ivec[n] ^= in[l]; + ++l; + n = (n+1) % 8; + } + *num = n; + } else { +#if !defined(OPENSSL_SMALL_FOOTPRINT) + if (8%sizeof(size_t) == 0) do { /* always true actually */ + while (n && len) { + unsigned char c; + *(out++) = ivec[n] ^ (c = *(in++)); ivec[n] = c; + --len; + n = (n+1) % 8; + } +#ifdef __STRICT_ALIGNMENT + if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) + break; +#endif + while (len>=8) { + (*block)(ivec, ivec, key); + for (; n<8; n+=sizeof(size_t)) { + size_t t = *(size_t*)(in+n); + *(size_t*)(out+n) = *(size_t*)(ivec+n) ^ t; + *(size_t*)(ivec+n) = t; + } + len -= 8; + out += 8; + in += 8; + n = 0; + } + if (len) { + (*block)(ivec, ivec, key); + while (len--) { + unsigned char c; + out[n] = ivec[n] ^ (c = in[n]); ivec[n] = c; + ++n; + } + } + *num = n; + return; + } while (0); + /* the rest would be commonly eliminated by x86* compiler */ +#endif + while (l<len) { + unsigned char c; + if (n == 0) { + (*block)(ivec, ivec, key); + } + out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c; + ++l; + n = (n+1) % 8; + } + *num=n; + } +} diff --git a/src/lib/libcrypto/modes/ctr64.c b/src/lib/libcrypto/modes/ctr64.c new file mode 100644 index 000000000000..e1743cb91193 --- /dev/null +++ b/src/lib/libcrypto/modes/ctr64.c @@ -0,0 +1,174 @@ +/* $OpenBSD: ctr64.c,v 1.7 2017/08/13 17:46:24 bcook Exp $ */ +/* ==================================================================== + * Copyright (c) 2008 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-c...@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + */ + +#include <openssl/crypto.h> +#include "modes_lcl.h" +#include <string.h> + +#ifndef MODES_DEBUG +# ifndef NDEBUG +# define NDEBUG +# endif +#endif +#include <assert.h> + +/* NOTE: the IV/counter CTR mode is big-endian. The code itself + * is endian-neutral. */ + +/* increment counter (64-bit int) by 1 */ +static void ctr64_inc(unsigned char *counter) { + u32 n=8; + u8 c; + + do { + --n; + c = counter[n]; + ++c; + counter[n] = c; + if (c) return; + } while (n); +} + +#if !defined(OPENSSL_SMALL_FOOTPRINT) +static void +ctr64_inc_aligned(unsigned char *counter) +{ +#if BYTE_ORDER == LITTLE_ENDIAN + ctr64_inc(counter); +#else + size_t *data, c, n; + data = (size_t *)counter; + n = 8 / sizeof(size_t); + do { + --n; + c = data[n]; + ++c; + data[n] = c; + if (c) + return; + } while (n); +#endif +} +#endif + +/* The input encrypted as though 64bit counter mode is being + * used. The extra state information to record how much of the + * 64bit block we have used is contained in *num, and the + * encrypted counter is kept in ecount_buf. Both *num and + * ecount_buf must be initialised with zeros before the first + * call to CRYPTO_ctr64_encrypt(). + * + * This algorithm assumes that the counter is in the x lower bits + * of the IV (ivec), and that the application has full control over + * overflow and the rest of the IV. This implementation takes NO + * responsability for checking that the counter doesn't overflow + * into the rest of the IV when incremented. + */ +void CRYPTO_ctr64_encrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[8], unsigned char ecount_buf[8], + unsigned int *num, block64_f block) +{ + unsigned int n; + size_t l=0; + + assert(*num < 8); + + n = *num; + +#if !defined(OPENSSL_SMALL_FOOTPRINT) + if (8%sizeof(size_t) == 0) do { /* always true actually */ + while (n && len) { + *(out++) = *(in++) ^ ecount_buf[n]; + --len; + n = (n+1) % 8; + } + +#ifdef __STRICT_ALIGNMENT + if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) + break; +#endif + while (len>=8) { + (*block)(ivec, ecount_buf, key); + ctr64_inc_aligned(ivec); + for (; n<8; n+=sizeof(size_t)) + *(size_t *)(out+n) = + *(size_t *)(in+n) ^ *(size_t *)(ecount_buf+n); + len -= 8; + out += 8; + in += 8; + n = 0; + } + if (len) { + (*block)(ivec, ecount_buf, key); + ctr64_inc_aligned(ivec); + while (len--) { + out[n] = in[n] ^ ecount_buf[n]; + ++n; + } + } + *num = n; + return; + } while(0); + /* the rest would be commonly eliminated by x86* compiler */ +#endif + while (l<len) { + if (n==0) { + (*block)(ivec, ecount_buf, key); + ctr64_inc(ivec); + } + out[l] = in[l] ^ ecount_buf[n]; + ++l; + n = (n+1) % 8; + } + + *num=n; +} diff --git a/src/lib/libcrypto/modes/modes.h b/src/lib/libcrypto/modes/modes.h index 67ec7518d621..2344e944ea31 100644 --- a/src/lib/libcrypto/modes/modes.h +++ b/src/lib/libcrypto/modes/modes.h @@ -139,6 +139,32 @@ typedef struct xts128_context XTS128_CONTEXT; int CRYPTO_xts128_encrypt(const XTS128_CONTEXT *ctx, const unsigned char iv[16], const unsigned char *inp, unsigned char *out, size_t len, int enc); +typedef void (*block64_f)(const unsigned char in[8], + unsigned char out[8], + const void *key); + +void CRYPTO_cbc64_encrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[8], block64_f block); +void CRYPTO_cbc64_decrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[8], block64_f block); + +void CRYPTO_ctr64_encrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[8], unsigned char ecount_buf[8], + unsigned int *num, block64_f block); + +void CRYPTO_ofb64_encrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[8], int *num, + block64_f block); + +void CRYPTO_cfb64_encrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[8], int *num, + int enc, block64_f block); + #ifdef __cplusplus } #endif diff --git a/src/lib/libcrypto/modes/ofb64.c b/src/lib/libcrypto/modes/ofb64.c new file mode 100644 index 000000000000..8368811cecbf --- /dev/null +++ b/src/lib/libcrypto/modes/ofb64.c @@ -0,0 +1,119 @@ +/* $OpenBSD: ofb64.c,v 1.4 2015/02/10 09:46:30 miod Exp $ */ +/* ==================================================================== + * Copyright (c) 2008 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-c...@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + */ + +#include <openssl/crypto.h> +#include "modes_lcl.h" +#include <string.h> + +#ifndef MODES_DEBUG +# ifndef NDEBUG +# define NDEBUG +# endif +#endif + +/* The input and output encrypted as though 64bit ofb mode is being + * used. The extra state information to record how much of the + * 64bit block we have used is contained in *num; + */ +void CRYPTO_ofb64_encrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[8], int *num, + block64_f block) +{ + unsigned int n; + size_t l=0; + + n = *num; + +#if !defined(OPENSSL_SMALL_FOOTPRINT) + if (8%sizeof(size_t) == 0) do { /* always true actually */ + while (n && len) { + *(out++) = *(in++) ^ ivec[n]; + --len; + n = (n+1) % 8; + } +#ifdef __STRICT_ALIGNMENT + if (((size_t)in|(size_t)out|(size_t)ivec)%sizeof(size_t) != 0) + break; +#endif + while (len>=8) { + (*block)(ivec, ivec, key); + for (; n<8; n+=sizeof(size_t)) + *(size_t*)(out+n) = + *(size_t*)(in+n) ^ *(size_t*)(ivec+n); + len -= 8; + out += 8; + in += 8; + n = 0; + } + if (len) { + (*block)(ivec, ivec, key); + while (len--) { + out[n] = in[n] ^ ivec[n]; + ++n; + } + } + *num = n; + return; + } while(0); + /* the rest would be commonly eliminated by x86* compiler */ +#endif + while (l<len) { + if (n==0) { + (*block)(ivec, ivec, key); + } + out[l] = in[l] ^ ivec[n]; + ++l; + n = (n+1) % 8; + } + + *num=n; +} -- 2.27.0
