diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/modes/cbc128.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/modes/cbc128.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/modes/cbc128.c b/openssl-1.1.0h/crypto/modes/cbc128.c new file mode 100644 index 0000000..4ce5eb2 --- /dev/null +++ b/openssl-1.1.0h/crypto/modes/cbc128.c @@ -0,0 +1,161 @@ +/* + * Copyright 2008-2016 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/crypto.h> +#include "modes_lcl.h" +#include <string.h> + +#if !defined(STRICT_ALIGNMENT) && !defined(PEDANTIC) +# define STRICT_ALIGNMENT 0 +#endif + +void CRYPTO_cbc128_encrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[16], block128_f block) +{ + size_t n; + const unsigned char *iv = ivec; + + if (len == 0) + return; + +#if !defined(OPENSSL_SMALL_FOOTPRINT) + if (STRICT_ALIGNMENT && + ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) { + while (len >= 16) { + for (n = 0; n < 16; ++n) + out[n] = in[n] ^ iv[n]; + (*block) (out, out, key); + iv = out; + len -= 16; + in += 16; + out += 16; + } + } else { + while (len >= 16) { + for (n = 0; n < 16; n += sizeof(size_t)) + *(size_t *)(out + n) = + *(size_t *)(in + n) ^ *(size_t *)(iv + n); + (*block) (out, out, key); + iv = out; + len -= 16; + in += 16; + out += 16; + } + } +#endif + while (len) { + for (n = 0; n < 16 && n < len; ++n) + out[n] = in[n] ^ iv[n]; + for (; n < 16; ++n) + out[n] = iv[n]; + (*block) (out, out, key); + iv = out; + if (len <= 16) + break; + len -= 16; + in += 16; + out += 16; + } + memcpy(ivec, iv, 16); +} + +void CRYPTO_cbc128_decrypt(const unsigned char *in, unsigned char *out, + size_t len, const void *key, + unsigned char ivec[16], block128_f block) +{ + size_t n; + union { + size_t t[16 / sizeof(size_t)]; + unsigned char c[16]; + } tmp; + + if (len == 0) + return; + +#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 >= 16) { + (*block) (in, out, key); + for (n = 0; n < 16; ++n) + out[n] ^= iv[n]; + iv = in; + len -= 16; + in += 16; + out += 16; + } + } else if (16 % sizeof(size_t) == 0) { /* always true */ + while (len >= 16) { + size_t *out_t = (size_t *)out, *iv_t = (size_t *)iv; + + (*block) (in, out, key); + for (n = 0; n < 16 / sizeof(size_t); n++) + out_t[n] ^= iv_t[n]; + iv = in; + len -= 16; + in += 16; + out += 16; + } + } + memcpy(ivec, iv, 16); + } else { + if (STRICT_ALIGNMENT && + ((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) { + unsigned char c; + while (len >= 16) { + (*block) (in, tmp.c, key); + for (n = 0; n < 16; ++n) { + c = in[n]; + out[n] = tmp.c[n] ^ ivec[n]; + ivec[n] = c; + } + len -= 16; + in += 16; + out += 16; + } + } else if (16 % sizeof(size_t) == 0) { /* always true */ + while (len >= 16) { + 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 < 16 / sizeof(size_t); n++) { + c = in_t[n]; + out_t[n] = tmp.t[n] ^ ivec_t[n]; + ivec_t[n] = c; + } + len -= 16; + in += 16; + out += 16; + } + } + } +#endif + while (len) { + unsigned char c; + (*block) (in, tmp.c, key); + for (n = 0; n < 16 && n < len; ++n) { + c = in[n]; + out[n] = tmp.c[n] ^ ivec[n]; + ivec[n] = c; + } + if (len <= 16) { + for (; n < 16; ++n) + ivec[n] = in[n]; + break; + } + len -= 16; + in += 16; + out += 16; + } +} |