52     const unsigned char *s1, *s2, *end = input + ilen;  in convert_pem_to_der()  local
55     s1 = (unsigned char *) strstr((const char *) input, "-----BEGIN");  in convert_pem_to_der()
56     if (s1 == NULL) {  in convert_pem_to_der()
65     s1 += 10;  in convert_pem_to_der()
66     while (s1 < end && *s1 != '-') {  in convert_pem_to_der()
67         s1++;  in convert_pem_to_der()
69     while (s1 < end && *s1 == '-') {  in convert_pem_to_der()
70         s1++;  in convert_pem_to_der()
72     if (*s1 == '\r') {  in convert_pem_to_der()
73         s1++;  in convert_pem_to_der()
75     if (*s1 == '\n') {  in convert_pem_to_der()
76         s1++;  in convert_pem_to_der()
79     if (s2 <= s1 || s2 > end) {  in convert_pem_to_der()
83     ret = mbedtls_base64_decode(NULL, 0, &len, (const unsigned char *) s1, s2 - s1);  in convert_pem_to_der()
92     if ((ret = mbedtls_base64_decode(output, len, &len, (const unsigned char *) s1,  in convert_pem_to_der()
93                                      s2 - s1)) != 0) {  in convert_pem_to_der()