详解PHP版本兼容之openssl调用参数(2)

static EVP_MD * php_openssl_get_evp_md_from_algo(long algo) { /* {{{ */ EVP_MD *mdtype; switch (algo) { case OPENSSL_ALGO_SHA1: mdtype = (EVP_MD *) EVP_sha1(); break; case OPENSSL_ALGO_MD5: mdtype = (EVP_MD *) EVP_md5(); break; case OPENSSL_ALGO_MD4: mdtype = (EVP_MD *) EVP_md4(); break; #ifdef HAVE_OPENSSL_MD2_H case OPENSSL_ALGO_MD2: mdtype = (EVP_MD *) EVP_md2(); break; #endif case OPENSSL_ALGO_DSS1: mdtype = (EVP_MD *) EVP_dss1(); break; default: return NULL; break; } return mdtype; }

php7.1.18

static EVP_MD * php_openssl_get_evp_md_from_algo(zend_long algo) { /* {{{ */ EVP_MD *mdtype; switch (algo) { case OPENSSL_ALGO_SHA1: mdtype = (EVP_MD *) EVP_sha1(); break; case OPENSSL_ALGO_MD5: mdtype = (EVP_MD *) EVP_md5(); break; case OPENSSL_ALGO_MD4: mdtype = (EVP_MD *) EVP_md4(); break; #ifdef HAVE_OPENSSL_MD2_H case OPENSSL_ALGO_MD2: mdtype = (EVP_MD *) EVP_md2(); break; #endif #if OPENSSL_VERSION_NUMBER < 0x10100000L || defined (LIBRESSL_VERSION_NUMBER) case OPENSSL_ALGO_DSS1: mdtype = (EVP_MD *) EVP_dss1(); break; #endif case OPENSSL_ALGO_SHA224: mdtype = (EVP_MD *) EVP_sha224(); break; case OPENSSL_ALGO_SHA256: mdtype = (EVP_MD *) EVP_sha256(); break; case OPENSSL_ALGO_SHA384: mdtype = (EVP_MD *) EVP_sha384(); break; case OPENSSL_ALGO_SHA512: mdtype = (EVP_MD *) EVP_sha512(); break; case OPENSSL_ALGO_RMD160: mdtype = (EVP_MD *) EVP_ripemd160(); break; default: return NULL; break; } return mdtype; }

由上面源代码可以很清晰的发现问题所在，随着php版本的升级，其所在的openssl扩展对应的调用条件也增加了很多，最后导致上述问题的源码也只是switch…case少了几个条件，在此也希望大家发现问题的时候，可以先去解决问题，然后有兴趣的话可以去查看源代码分析下问题所导致的原因。

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