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OpenSSL中对称加密算法的统一接口详解

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关键字： ARM linux 内核栈 zImage ktype AWK

本文详细介绍OpenSSL中对称加密算法的统一接口详解

　　2) 宏BLOCK_CIPHER_defs用于定义算法结构，定义为：

#define BLOCK_CIPHER_defs(cname, kstruct,
nid, block_size, key_len, iv_len, cbits, flags,
init_key, cleanup, set_asn1, get_asn1, ctrl)
BLOCK_CIPHER_def_cbc(cname, kstruct, nid, block_size, key_len, iv_len, flags,
init_key, cleanup, set_asn1, get_asn1, ctrl)
BLOCK_CIPHER_def_cfb(cname, kstruct, nid, key_len, iv_len, cbits,
flags, init_key, cleanup, set_asn1, get_asn1, ctrl)
BLOCK_CIPHER_def_ofb(cname, kstruct, nid, key_len, iv_len, cbits,
flags, init_key, cleanup, set_asn1, get_asn1, ctrl)
BLOCK_CIPHER_def_ecb(cname, kstruct, nid, block_size, key_len, iv_len, flags,
init_key, cleanup, set_asn1, get_asn1, ctrl)

　　其中BLOCK_CIPHER_def_cbc定义为：

#define BLOCK_CIPHER_def_cbc(cname, kstruct, nid, block_size, key_len,
iv_len, flags, init_key, cleanup, set_asn1,
get_asn1, ctrl)
BLOCK_CIPHER_def1(cname, cbc, cbc, CBC, kstruct, nid, block_size, key_len,
iv_len, flags, init_key, cleanup, set_asn1, get_asn1, ctrl)

　　而BLOCK_CIPHER_def1定义为：

#define BLOCK_CIPHER_def1(cname, nmode, mode, MODE, kstruct, nid, block_size,
key_len, iv_len, flags, init_key, cleanup,
set_asn1, get_asn1, ctrl)
static const EVP_CIPHER cname##_##mode = {
nid##_##nmode, block_size, key_len, iv_len,
flags | EVP_CIPH_##MODE##_MODE,
init_key,
cname##_##mode##_cipher,
cleanup,
sizeof(kstruct),
set_asn1, get_asn1,
ctrl,
NULL
};
const EVP_CIPHER *EVP_##cname##_##mode(void) { return &cname##_##mode; }

　　所以宏BLOCK_CIPHER_def_cbc展开后就是blowfish的cbc算法结构定义：

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