CFLAGS=-g -c -Aa -Ae +DD64
APPLIBS=-L/opt/openssl/0.9.8/lib/hpux64 -lssl -lcrypto -L/usr/lib/hpux64
CC=cc
all: aes
.c.o:
$(CC) $(CFLAGS) $*.c
aes: aes.o
$(CC) -o aes aes.o \
$(APPLIBS) +DD64
clean:
rm -f *.o
aes.c源码我就不讲了，大家可以参照上面那个链接里面的，这里主要讲下makefile里面的注意点。
makefile文件里如果没有-L/opt/openssl/0.9.8/lib/hpux64 -lssl -lcrypto则会抛出以下错误：
ld: Unsatisfied symbol "EVP_EncryptInit_ex" in file aes.o
ld: Unsatisfied symbol "EVP_DecryptInit_ex" in file aes.o
ld: Unsatisfied symbol "EVP_CIPHER_CTX_cleanup" in file aes.o
ld: Unsatisfied symbol "EVP_EncodeBlock" in file aes.o
ld: Unsatisfied symbol "EVP_CIPHER_CTX_init" in file aes.o
ld: Unsatisfied symbol "EVP_EncryptFinal_ex" in file aes.o
ld: Unsatisfied symbol "EVP_DecryptFinal_ex" in file aes.o
ld: Unsatisfied symbol "EVP_DecryptUpdate" in file aes.o
ld: Unsatisfied symbol "EVP_EncryptUpdate" in file aes.o
ld: Unsatisfied symbol "EVP_aes_128_ecb" in file aes.o
ld: Unsatisfied symbol "EVP_DecodeBlock" in file aes.o
11 errors.
*** Error exit code 1
这是由于没有链接到openssl库的原因，那么大家也就明白加上这句的缘由了。makefile中/opt/openssl/0.9.8/lib/hpux64这个路径是openssl安装后库的所在路径，路径下应该有 libcrypto.a libssl.a libcrypto.so libssl.so 这些库文件。
讲了这么多其实就是对makefile的编写不熟悉，希望一样遇到此问题的看到这篇文章后能够顺利解决问题。