NSData_AMDigest.m

#include <openssl/evp.h>
#include <openssl/err.h>


@implementation NSData (AMDigest)

- (NSData *)md5Digest
{
	// compute an MD5 digest.
	EVP_MD_CTX mdctx;
	unsigned char md_value[EVP_MAX_MD_SIZE];
	int unsigned md_len;
	EVP_DigestInit(&mdctx, EVP_md5());
	EVP_DigestUpdate(&mdctx, [self bytes], [self length]);
	EVP_DigestFinal(&mdctx, md_value, &md_len);
	EVP_MD_CTX_cleanup(&mdctx); // added by Jerry
	return [NSData dataWithBytes: md_value length: md_len];
}

- (NSData *)sha1Digest
{
	// compute an SHA1 digest.
	EVP_MD_CTX mdctx;
	unsigned char md_value[EVP_MAX_MD_SIZE];
	int unsigned md_len;
	EVP_DigestInit(&mdctx, EVP_sha1());
	EVP_DigestUpdate(&mdctx, [self bytes], [self length]);
	EVP_DigestFinal(&mdctx, md_value, &md_len);
	EVP_MD_CTX_cleanup(&mdctx); // added by Jerry
	return [NSData dataWithBytes: md_value length: md_len];
}

@end