用Java生成X509Certificate的主题哈希

这将生成一个短的8位数字哈希1817886a

OpenSSL有两种形式：

$ cd openssl-1.0.2-src$ grep -R X509_subject_name_hash *...crypto/x509/x509.h:unsigned long X509_subject_name_hash(X509 *x);crypto/x509/x509.h:unsigned long X509_subject_name_hash_old(X509 *x);crypto/x509/x509_cmp.c:unsigned long X509_subject_name_hash(X509 *x)crypto/x509/x509_cmp.c:unsigned long X509_subject_name_hash_old(X509 *x)...

在Java中生成X509Certificate的主题哈希…

这是他们的来源

crypto/x509/x509_cmp.c

unsigned long X509_subject_name_hash(X509 *x){    return (X509_NAME_hash(x->cert_info->subject));}#ifndef OPENSSL_NO_MD5unsigned long X509_subject_name_hash_old(X509 *x){    return (X509_NAME_hash_old(x->cert_info->subject));}#endif

最后：

unsigned long X509_NAME_hash(X509_NAME *x){    unsigned long ret = 0;    unsigned char md[SHA_DIGEST_LENGTH];        i2d_X509_NAME(x, NULL);    if (!EVP_Digest(x->canon_enc, x->canon_enclen, md, NULL, EVP_sha1(),         NULL))        return 0;    ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) |((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)        ) & 0xffffffffL;    return (ret);}#ifndef OPENSSL_NO_MD5unsigned long X509_NAME_hash_old(X509_NAME *x){    EVP_MD_CTX md_ctx;    unsigned long ret = 0;    unsigned char md[16];        i2d_X509_NAME(x, NULL);    EVP_MD_CTX_init(&md_ctx);    EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);    if (EVP_DigestInit_ex(&md_ctx, EVP_md5(), NULL)        && EVP_DigestUpdate(&md_ctx, x->bytes->data, x->bytes->length)        && EVP_DigestFinal_ex(&md_ctx, md, NULL))        ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) |    ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L) ) & 0xffffffffL;    EVP_MD_CTX_cleanup(&md_ctx);    return (ret);}#endif

i2d_X509_NAME

X509_NAME

您可以使用类似的命令查看OpenSSL用于名称字符串的内容

openssl x509 -in <cert> -text-noout

C=US, ST=California, L=Mountain View, O=Google Inc,CN=www.google.com

在Java中生成X509Certificate的主题哈希…

在大图中，您正在生成主题的专有名称字符串的哈希，并返回一个无符号的long。unsigned long实际上是一个截断的哈希。

X509_subject_name_hash

X509_subject_name_hash_old

（评论）…他们如何使用sha1哈希生成该短哈希

OpenSSL提供了截断的哈希的十六进制编码。整个哈希在中

md

md

截断与字节选择发生

[0,3]

md[0]

md[1]

md[2]

md[3]

8位数字来自对4个字节进行十六进制编码。