boringssl EVP_aes_128_ecb实现

最近学习boringssl，发现没找到EVP_aes_128_ecb在哪里实现的

饶了一大圈，发现它的定义很无语

#define EVP_CIPHER_FUNCTION(keybits, mode)             \
  const EVP_CIPHER *EVP_aes_##keybits##_##mode(void) { \
    return aes_##keybits##_##mode##_generic();         \
  }



EVP_CIPHER_FUNCTION(128, cbc)
EVP_CIPHER_FUNCTION(128, ctr)
EVP_CIPHER_FUNCTION(128, ofb)
EVP_CIPHER_FUNCTION(128, gcm)

EVP_CIPHER_FUNCTION(192, cbc)
EVP_CIPHER_FUNCTION(192, ctr)
EVP_CIPHER_FUNCTION(192, ofb)
EVP_CIPHER_FUNCTION(192, gcm)

EVP_CIPHER_FUNCTION(256, cbc)
EVP_CIPHER_FUNCTION(256, ctr)
EVP_CIPHER_FUNCTION(256, ofb)
EVP_CIPHER_FUNCTION(256, gcm)

EVP_ECB_CIPHER_FUNCTION(128)
EVP_ECB_CIPHER_FUNCTION(192)
EVP_ECB_CIPHER_FUNCTION(256)

随便拿EVP_CIPHER_FUNCTION(128, cbc)展开

EVP_CIPHER_FUNCTION(128, cbc) =   const EVP_CIPHER *EVP_aes_128_cbc(void) {  \
    return aes_128_cbc_generic();                                            \
  }

这里的 aes_128_cbc_generic 参考boringssl DEFINE_LOCAL_DATA

其实有方向的情况下可以用gcc -E ./src/crypto/fipsmodule/cipher/e_aes.c -o test.i -I include/

-E,只执行到预编译，直接输出预编译结果【有目标的情况下】

可以看看如下的预编译结果

# 855 "./src/crypto/fipsmodule/cipher/e_aes.c"
const EVP_CIPHER *EVP_aes_128_cbc(void) { return aes_128_cbc_generic(); }
const EVP_CIPHER *EVP_aes_128_ctr(void) { return aes_128_ctr_generic(); }
const EVP_CIPHER *EVP_aes_128_ofb(void) { return aes_128_ofb_generic(); }
const EVP_CIPHER *EVP_aes_128_gcm(void) { return aes_128_gcm_generic(); }

const EVP_CIPHER *EVP_aes_192_cbc(void) { return aes_192_cbc_generic(); }
const EVP_CIPHER *EVP_aes_192_ctr(void) { return aes_192_ctr_generic(); }
const EVP_CIPHER *EVP_aes_192_ofb(void) { return aes_192_ofb_generic(); }
const EVP_CIPHER *EVP_aes_192_gcm(void) { return aes_192_gcm_generic(); }

const EVP_CIPHER *EVP_aes_256_cbc(void) { return aes_256_cbc_generic(); }
const EVP_CIPHER *EVP_aes_256_ctr(void) { return aes_256_ctr_generic(); }
const EVP_CIPHER *EVP_aes_256_ofb(void) { return aes_256_ofb_generic(); }
const EVP_CIPHER *EVP_aes_256_gcm(void) { return aes_256_gcm_generic(); }

const EVP_CIPHER *EVP_aes_128_ecb(void) { if (hwaes_capable()) { return aes_hw_128_ecb(); } return aes_128_ecb_generic(); }
const EVP_CIPHER *EVP_aes_192_ecb(void) { if (hwaes_capable()) { return aes_hw_192_ecb(); } return aes_192_ecb_generic(); }
const EVP_CIPHER *EVP_aes_256_ecb(void) { if (hwaes_capable()) { return aes_hw_256_ecb(); } return aes_256_ecb_generic(); }

文件 "./src/crypto/fipsmodule/cipher/e_aes.c + 行号；855