printfで8bitずつ出力されない謎コード

Makefile

# ----------------------------------------------------------------
# environment
CC		= gcc

# ----------------------------------------------------------------
# options

CFLAGS		= -std=c99 -lcrypto

# ----------------------------------------------------------------
# sources and objects

C_SRC		= sha512test.c

C_OBJ		= $(C_SRC:.c=)

# ----------------------------------------------------------------
# executables

EXEC		= $(C_OBJ) 

all:		$(EXEC)

$(C_OBJ):	$(C_SRC)
	$(CC) -o $@ $(CFLAGS) $(C_SRC)


# ----------------------------------------------------------------
# rules

.c.:
	$(CC) -o $* $(CFLAGS) -c $<

# ----------------------------------------------------------------
# clean up

clean:
	/bin/rm -f $(EXEC)

# ----------------------------------------------------------------
# End of Makefile

result.txt

## 修正前

$ ./sha2512test
ffffffdbffffffb5237ffffffad3fffffffa5ffffffb818ffffffb8ffffffeeffffffcaffffff9cffffffa25a47ef29517dffffffb2ffffffb25f4affffff8dffffffb5fffffff717ffffffffffffff90ffffffbfb7effffff94ffffffef4f5c4e313dfffffffb6ffffffe4ffffff8fffffffbdffffff9a2e4079596ffffffa75c47cffffffdb61ffffff9cfffffff9ffffffc2ffffffd4fffffff6ffffffd9

$ gcc -v
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.0.0
Thread model: posix

## 修正後
$ ./hprng
dbb5237ad3fa5b818b8eeca9ca25a47ef29517db2b25f4a8db5f717ff90bfb7e94ef4f5c4e313dfb6e48fbd9a2e4079596a75c47cdb619cf9c2d4f6d9

sha512test.c

#include <stdio.h>
#include <stdint.h>
#include <string.h>

#include <openssl/sha.h>

int main(void){

	char hoge[]= "hoge";
	char hash[64];

	SHA512(hoge, strlen(hoge), hash);

	for(int i=0;i < 64; i++){
		// hhは長さ指定子
		// http://linuxjm.sourceforge.jp/html/LDP_man-pages/man3/printf.3.html
		printf("%02hhx", hash[i]);
	}
	printf("\n");

	return 0;
}