ios object-c 使用公钥字符串 进行rsa加密
时间: 2024-05-04 10:16:53 浏览: 16
iOS中使用公钥字符串进行RSA加密的步骤如下:
1. 将公钥字符串转换为NSData类型。
```
NSString *publicKeyString = @"-----BEGIN PUBLIC KEY-----\n...公钥字符串...\n-----END PUBLIC KEY-----";
NSData *publicKeyData = [publicKeyString dataUsingEncoding:NSUTF8StringEncoding];
```
2. 创建SecKey对象。
```
NSMutableDictionary *publicKeyAttributes = [[NSMutableDictionary alloc] init];
[publicKeyAttributes setObject:(__bridge id)kSecAttrKeyTypeRSA forKey:(__bridge id)kSecAttrKeyType];
[publicKeyAttributes setObject:@(2048) forKey:(__bridge id)kSecAttrKeySizeInBits];
[publicKeyAttributes setObject:publicKeyData forKey:(__bridge id)kSecValueData];
[publicKeyAttributes setObject:(__bridge id)kSecAttrKeyClassPublic forKey:(__bridge id)kSecAttrKeyClass];
SecKeyRef publicKey;
OSStatus status = SecItemAdd((__bridge CFDictionaryRef)publicKeyAttributes, (CFTypeRef *)&publicKey);
```
3. 使用SecKey对象进行加密。
```
NSData *plainData = [@"要加密的数据" dataUsingEncoding:NSUTF8StringEncoding];
size_t cipherBufferSize = SecKeyGetBlockSize(publicKey);
uint8_t *cipherBuffer = malloc(cipherBufferSize);
memset(cipherBuffer, 0, cipherBufferSize);
OSStatus status = SecKeyEncrypt(publicKey, kSecPaddingPKCS1, [plainData bytes], [plainData length], cipherBuffer, &cipherBufferSize);
NSData *encryptedData = [NSData dataWithBytesNoCopy:cipherBuffer length:cipherBufferSize];
```
4. 释放SecKey对象。
```
CFRelease(publicKey);
```
注意:在iOS中使用公钥加密时,需要使用PKCS#1填充模式(kSecPaddingPKCS1)。另外,如果公钥字符串中的换行符不是`\n`,需要将其替换为`\n`。